@media (max-width: 519px) {
    #cbt-title {
        flex-flow: column !important;
        height: auto !important;
    }

    .cbt-problemTitle, .right-buttons {
        padding: 10px 0 !important;
    }
     
}

/* 피그마 기준 */
@media (max-width: 768px) {
    .cbt-container {
        flex-flow: column !important;
        height: auto !important;
    }

    #cbt-title {
        margin-left: 24px !important;
        margin-right: 24px !important;
        align-items: normal !important;
    }

    .cbt-problemTitle {
        align-items: center;
        padding-left: 0 !important;
        /* overflow: hidden;          */
        /* text-overflow: ellipsis;   */
        /* white-space: nowrap;       */
        max-width: 300px !important;
        text-align: left !important;
    }
    
    .cbt-problemTitle svg {
        margin-left: 8px !important;
    }

    #left-panel {
        max-width: 768px !important;
    }

    #drag-bar {
        display: none !important;
    }

    #containerFrame {
        height: 480px !important;
        flex: auto !important;
    }

    #right-buttons span {
        display: none !important;
    }

}

.cbt-title-container {
    width: 100%;
    background-color: #eee;
    z-index: 999; /* container 위에 위치 */
    margin-top: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cbt-title-container.dark {
    width: 100%;
    background-color: #eee;
    z-index: 999; /* container 위에 위치 */
    margin-top: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #2E313D;
    color: #FFF;
}



#cbt-title {
    min-width: 95% !important;
    height: 54px;
    display: flex;
    align-items: center;
    justify-content: space-between;   
}

  
.cbt-problemTitle {
    color: #242424;
    font-size: 16px;
    font-style: normal;
    font-weight: 700;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
    display: flex;
    padding-left: 32px;
}

.cbt-problemTitle.dark {
    color: #fff;
    font-size: 16px;
    font-style: normal;
    font-weight: 700;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
    display: flex;
    padding-left: 32px;
}

.right-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
}

.cbt-title-textbtn {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 12px;
    color: #242424;
    text-align: center;
    font-family: Pretendard;
    font-size: 16px;
    font-style: normal;
    font-weight: 500;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
    margin-right: 8px;
}

.cbt-title-textbtn.dark {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 12px;
    color: #fff;
    text-align: center;
    font-family: Pretendard;
    font-size: 16px;
    font-style: normal;
    font-weight: 500;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
    margin-right: 8px;
}

.cbt-title-textbtn:hover {
    cursor: pointer;
    font-weight: 700;
}

.cbt-title-textbtn > svg {
    margin-right: 4px;
}

.cbt-title-btn {
    display: flex;
    padding: 12px;
    justify-content: center;
    align-items: center;
    line-height: 16px;
    border-radius: 8px;
}

.cbt-title-btn:hover {
    cursor: pointer;
    font-weight: 700;
}

.cbt-title-btn.reset {
    background-color: #fff;
    color: #2E313D;
    margin-right: 8px;
}

.cbt-title-btn:disabled {
    opacity: 0.65;
    cursor: wait;
}

.cbt-title-btn.light.selected {
    background-color: #fff;
    color: #2E313D;
}

.cbt-title-btn.light {
    background-color: #fff;
    color: #2E313D;
}

.cbt-title-btn.dark.selected {
    background-color: #2E313D;
    color: #fff;
}

.cbt-title-btn.dark {
    background-color: #eee;
    color: #2E313D;
}

/* 전체 컨테이너가 100vh를 차지하도록 설정 */
.cbt-container {
    padding: 0;
    display: flex;
    width: 100% !important;
    height: calc(100vh - 134px);
    flex-direction: row; /* 좌우 배치 */
    overflow-y: hidden;
}

/* left-panel 설정 */
#left-panel {
    position: relative;
    flex-basis: 50%;
    min-width: 20%;
    max-width: 80%;
    overflow: hidden;
    display: flex;
    flex-flow: column;
}

#left-panel.dark {
    position: relative;
    flex-basis: 50%;
    min-width: 20%;
    max-width: 80%;
    overflow: hidden;
    display: flex;
    flex-flow: column;
    background-color: #2E313D;
}

#left-panel-attach {
    display: flex; 
    align-items: center; 
    gap: 10px;
}

#left-panel-main {
    font-size: 1.0em;
    flex: 1;
    display: flex;
    flex-flow: column;
}

.lab-status-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 16px 24px 12px;
    background: #f5f5f5;
    border-bottom: 1px solid #e1e1e1;
}

.lab-status-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    color: #242424;
    font-size: 13px;
    font-weight: 500;
}

.lab-status-label {
    color: #777777;
}

.lab-status-value {
    color: #242424;
    font-weight: 700;
}

body.dark .lab-status-bar {
    background: #252526;
    border-bottom-color: #37383d;
}

body.dark .lab-status-item {
    background: #1d1e22;
    color: #fff;
}

body.dark .lab-status-label {
    color: #a0a0a0;
}

body.dark .lab-status-value {
    color: #fff;
}

.left-bottom-box {
    position: sticky;
    bottom: 0;
    padding: 24px 28px;
    box-sizing: border-box;
    min-height: 220px;
    display: flex;
    flex-flow: column;
    align-items: center;
    background-color: #eee;
    overflow: auto;
}

.left-bottom-box.dark {
    position: sticky;
    bottom: 0;
    padding: 24px 28px;
    box-sizing: border-box;
    min-height: 220px;
    display: flex;
    flex-flow: column;
    align-items: center;
    background-color: #2E313D;
    overflow: auto;
}

.left-bottom-answer-title {
    margin-right: auto;
    color: #242424;
    text-align: left;
    font-size: 16px;
    font-style: normal;
    font-weight: 700;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
    margin-bottom: 10px;
}

.left-bottom-answer-title.dark {
    margin-right: auto;
    color: #fff;
    text-align: left;
    font-size: 16px;
    font-style: normal;
    font-weight: 700;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
    margin-bottom: 10px;
}

.left-bottom-answer-btn {
    display: flex;
    padding: 16px;
    justify-content: center;
    align-items: center;
    border-radius: 12px;
    background: #242424;

    color: #FFF;
    text-align: center;
    font-family: Pretendard;
    font-size: 16px;
    font-style: normal;
    font-weight: 700;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
}

.left-bottom-answer-btn.dark {
    display: flex;
    padding: 16px;
    justify-content: center;
    align-items: center;
    border-radius: 12px;
    background: #fff;

    color: #242424;
    text-align: center;
    font-family: Pretendard;
    font-size: 16px;
    font-style: normal;
    font-weight: 700;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
}

.button-row {
    display: flex;
    gap: 12px;
    width: 100%;
}

.button-row .left-bottom-answer-btn {
    flex: 1;
}

.grading-summary {
    width: 100%;
    padding: 14px 16px;
    border-radius: 14px;
    background: #fff;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

body.dark .grading-summary {
    background: #1d1e22;
}

.grading-summary-main {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: flex-start;
}

.grading-result-text {
    color: #242424;
    font-size: 18px;
    font-weight: 700;
}

.grading-result-text.pending {
    color: #565b66;
}

.grading-result-text.success {
    color: #167c3b;
}

.grading-result-text.fail {
    color: #c53b2f;
}

body.dark .grading-result-text {
    color: #fff;
}

.grading-meta {
    color: #777;
    font-size: 13px;
}

body.dark .grading-meta {
    color: #b2b2b2;
}

.grading-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.grading-stat {
    display: inline-flex;
    align-items: center;
    padding: 7px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    background: #f1f1f1;
    color: #5f6368;
}

.grading-stat.pass {
    background: #e8f6ed;
    color: #167c3b;
}

.grading-stat.pending {
    background: #f3f3f3;
    color: #666;
}

body.dark .grading-stat {
    background: #2b2d33;
    color: #d0d0d0;
}

body.dark .grading-stat.pass {
    background: #173321;
    color: #8ee3a8;
}

.details-message {
    width: 100%;
    min-height: 72px;
    max-height: 160px;
    overflow: auto;
    margin-top: 12px;
    padding: 12px 14px;
    border-radius: 12px;
    background: #fff;
    color: #606060;
    font-size: 13px;
    line-height: 1.6;
}

body.dark .details-message {
    background: #1d1e22;
    color: #c6c6c6;
}

.output-success {
    color: #167c3b;
}

.output-fail {
    color: #c53b2f;
}


/* drag-bar 설정 */
#drag-bar {
    width: 12px; /* 드래그 바 너비 */
    height: auto;
    background-color: #eee;
    cursor: col-resize;
    display: flex;
    align-items: center;
    justify-content: center;
}

#drag-bar.dark {
    width: 12px; /* 드래그 바 너비 */
    height: auto;
    background-color: #252526;
    cursor: col-resize;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 위쪽의 containerFrame 영역 */
#containerFrame {
    width: 100%;
    border: none;
    background-color: #000;
    /* overflow: auto; */
    flex: 1;
}

.right-panel {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto; /* 스크롤 허용 */
    padding-top: 2px;
    background-color: #eee;
}

.right-panel.dark {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto; /* 스크롤 허용 */
    padding-top: 2px;
    background-color: #252526;
}

.right-panel-main {
    flex-grow: 1; /* 버튼을 제외한 모든 공간 채우기 */
    overflow: auto;
}

.right-panel-main-content {
    padding: 24px;
    margin-bottom: 10px;
    background-color: #fff;
    color: #242424; /* 기본 텍스트 색상 */
    overflow: hidden;
}

.right-panel-main-content.dark {
    padding: 24px;
    margin-bottom: 10px;
    background-color: #1D1E22;
    color: #fff; /* 다크 모드 텍스트 색상 */
    overflow: hidden;
}

.right-panel-title {
    color: #242424;
    font-size: 16px;
    font-style: normal;
    font-weight: 700;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
    text-align: left;
    margin-bottom: 15px;
}

.right-panel-title.dark {
    color: #fff;
    font-size: 16px;
    font-style: normal;
    font-weight: 700;
    line-height: 100%; /* 16px */
    letter-spacing: -0.32px;
    text-align: left;
    margin-bottom: 15px;
}

.problemDescription {
    text-align: left;
}

.right-panel-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 14px;
}

.right-panel-toggle:hover {
    cursor: pointer;
}

.toggle-indicator {
    font-size: 13px;
    font-weight: 600;
    color: #777;
}

body.dark .toggle-indicator {
    color: #b6b6b6;
}

.right-panel-body {
    display: none;
    max-height: 0;
    overflow: hidden;
}

.right-panel-body.open {
    display: block;
    max-height: 1000px;
    overflow-y: auto;
}

#right-panel-down {
    flex-grow: 1; /* 나머지 공간 차지 */
    overflow-y: auto; /* 내부 스크롤 */
    padding: 10px;
    background-color: #f9fafb;
}

.badge {
    font-size: 0.8em; 
    padding: 5px 10px; 
    display: inline-block;
}

.linux-exercise {
    text-decoration: none;
    display: flex;
    justify-content: center;
    align-items: center;
}

.linux-exercise > svg {
    padding-right: 10px;
}

.linux-exercise > svg:hover {
    cursor: pointer;
}

@media (max-width: 768px) {
    .lab-status-bar {
        padding: 14px 16px 10px;
    }

    .right-panel-main-content {
        padding: 18px;
    }

    .left-bottom-box {
        padding: 18px;
    }

    .button-row {
        flex-direction: column;
    }
}

/* Practice View Refresh */
.cbt-title-container {
    margin-top: 64px;
    background: #ffffff;
    border-bottom: 1px solid #e6eaf0;
    box-shadow: none;
}

#cbt-title {
    min-width: min(96%, 1440px) !important;
    height: 70px;
    gap: 24px;
}

.cbt-problemTitle {
    padding-left: 8px;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.04em;
}

.problem-title-text {
    display: inline-flex;
    align-items: center;
    min-width: 0;
}

.right-buttons {
    gap: 10px;
    flex-wrap: wrap;
}

.cbt-title-textbtn {
    margin-right: 0;
    padding: 10px 8px;
    border-radius: 0;
    background: transparent;
    border: 0;
    color: #4b5563;
    font-size: 14px;
    font-weight: 700;
}

.cbt-title-textbtn:hover {
    background: transparent;
    color: #111827;
}

.cbt-title-textbtn > svg {
    margin-right: 6px;
}

.cbt-title-btn {
    min-width: 108px;
    padding: 11px 16px;
    border: 1px solid #d7dde6;
    background: #ffffff;
    color: #111827;
    font-size: 14px;
    font-weight: 800;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
}

.cbt-title-btn.reset:hover {
    background: #f9fafb;
    border-color: #9ca3af;
}

.cbt-container {
    height: calc(100vh - 136px);
    padding: 18px;
    gap: 18px;
    background: #f3f5f8;
}

#left-panel {
    flex-basis: calc(100% - 462px);
    min-width: 0;
    max-width: none;
    gap: 16px;
}

#left-panel-main {
    gap: 16px;
}

.terminal-shell {
    display: flex;
    flex: 1;
    min-height: 420px;
    flex-direction: column;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid #0f172a;
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.12);
    background: #1f1f1f;
}

.terminal-shell-top {
    display: flex;
    align-items: center;
    gap: 14px;
    height: 42px;
    padding: 0 18px;
    background: #343434;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.terminal-lights {
    display: flex;
    gap: 8px;
}

.terminal-light {
    width: 11px;
    height: 11px;
    border-radius: 999px;
    display: inline-block;
}

.terminal-light.red { background: #fb7185; }
.terminal-light.yellow { background: #fbbf24; }
.terminal-light.green { background: #4ade80; }

.terminal-shell-title {
    flex: 1;
    text-align: center;
    color: #a1a1aa;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: none;
}

.lab-status-bar {
    gap: 10px;
    padding: 14px 18px;
    background: #1f1f1f;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.lab-status-item {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.04);
    color: #d1d5db;
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.lab-status-label { color: #9ca3af; }
.lab-status-value { color: #f3f4f6; }

#containerFrame {
    display: block;
    flex: 1;
    width: 100%;
    min-height: 420px;
    background: #111827;
}

.left-bottom-box {
    position: static;
    min-height: 0;
    padding: 22px;
    border-radius: 22px;
    align-items: stretch;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    box-shadow: 0 14px 40px rgba(148, 163, 184, 0.14);
}

.left-bottom-answer-title {
    margin-bottom: 14px;
    font-size: 18px;
    font-weight: 800;
}

.grading-summary {
    padding: 18px;
    border-radius: 18px;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    border: 1px solid #e2e8f0;
}

.grading-result-text {
    font-size: 20px;
}

.grading-meta {
    font-size: 13px;
    line-height: 1.5;
}

.details-message {
    min-height: 96px;
    max-height: 220px;
    margin-top: 14px;
    padding: 16px;
    border-radius: 16px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    color: #475569;
}

#drag-bar {
    width: 8px;
    border-radius: 999px;
    background: transparent;
}

#drag-bar-icon {
    background: rgba(255, 255, 255, 0.78);
    border: 1px solid #dbe3ee;
    border-radius: 999px;
    box-shadow: 0 8px 18px rgba(148, 163, 184, 0.2);
}

.right-panel {
    width: 540px;
    flex: 0 0 540px;
    padding-right: 4px;
}

.right-panel-main {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.right-panel-main-content {
    margin-bottom: 0;
    padding: 28px 30px;
    border-radius: 22px;
    border: 1px solid #edf0f4;
    background: #ffffff;
    box-shadow: 0 4px 16px rgba(148, 163, 184, 0.08);
}

.practice-card {
    padding: 28px 30px;
    border-radius: 22px;
}

.practice-card-problem,
.practice-card-requirements,
.practice-card-solution {
    border-top: 0;
}

.right-panel-toggle {
    margin-bottom: 16px;
    font-size: 17px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.right-panel-title-wrap {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.right-panel-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: auto;
    height: auto;
    border-radius: 0;
    font-size: 18px;
    font-weight: 900;
    background: transparent !important;
}

.right-panel-icon.icon-blue {
    color: #2563eb;
    background: #eff6ff;
}

.right-panel-icon.icon-amber {
    color: #f97316;
    background: #fff7ed;
}

.right-panel-icon.icon-violet {
    color: #9333ea;
    background: #faf5ff;
}

.toggle-indicator {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border-radius: 0;
    background: transparent;
    color: #64748b;
    font-size: 12px;
    font-weight: 700;
}

.problemDescription {
    color: #334155;
    font-size: 15px;
    line-height: 1.9;
}

.problem-token {
    display: inline;
    padding: 0 3px;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: #1f2937;
    font-family: "JetBrains Mono", Consolas, Monaco, "Courier New", monospace;
    font-size: 0.94em;
    font-weight: 800;
    line-height: inherit;
    word-break: break-all;
    white-space: normal;
}

.problem-token-command {
    color: #1d4ed8;
}

.problem-token-path,
.problem-token-file {
    color: #111827;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    text-decoration-color: #cbd5e1;
}

.problem-token-permission {
    color: #c2410c;
}

.requirements-copy {
    line-height: 2;
}

.submit-card {
    display: flex;
    flex-direction: column;
}

.submit-panel {
    margin-top: 20px;
    padding-top: 22px;
    border-top: 1px solid #edf0f4;
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: flex-end;
}

.submit-panel-copy {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 100%;
    text-align: center;
}

.submit-panel-label {
    color: #0f172a;
    font-size: 15px;
    font-weight: 800;
}

.submit-panel-meta {
    color: #64748b;
    font-size: 13px;
}

.left-bottom-answer-btn {
    width: 248px;
    max-width: 100%;
    padding: 17px 22px;
    border-radius: 14px;
    background: #3164ea;
    border: 1px solid #3164ea;
    box-shadow: 0 10px 24px rgba(49, 100, 234, 0.22);
    font-size: 16px;
}

.left-bottom-answer-btn:hover {
    background: #1d4ed8;
    border-color: #1d4ed8;
}

.left-bottom-answer-btn.secondary {
    background: #ffffff;
    color: #0f172a;
    border-color: #cbd5e1;
    box-shadow: none;
}

.left-bottom-answer-btn.secondary:hover {
    background: #f8fafc;
    border-color: #94a3b8;
}

.grading-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 1200;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(15, 23, 42, 0.52);
    backdrop-filter: blur(4px);
}

.grading-modal-card {
    position: relative;
    width: min(560px, calc(100vw - 32px));
    max-height: min(82vh, 720px);
    overflow: hidden;
    padding: 0;
    border-radius: 16px;
    background: #ffffff;
    border: 1px solid rgba(226, 232, 240, 0.6);
    box-shadow: 0 24px 64px rgba(15, 23, 42, 0.22);
    display: flex;
    flex-direction: column;
}

.grading-modal-card .terms-modal-close-btn,
.grading-modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    border: 0;
    background: transparent;
    color: #94a3b8;
    padding: 0;
    font-size: 26px;
    line-height: 1;
    transition: background 0.2s ease, color 0.2s ease;
}

.grading-modal-card .terms-modal-close-btn:hover,
.grading-modal-close:hover {
    cursor: pointer;
    background: #f8fafc;
    color: #64748b;
}

.grading-modal-card .terms-modal-header,
.grading-modal-header {
    margin-bottom: 0;
    padding: 20px 24px;
    padding-right: 72px;
    text-align: left;
    flex: 0 0 auto;
    border-bottom: 1px solid #f1f5f9;
    background: #ffffff;
}

.grading-modal-eyebrow {
    display: inline-block;
    margin-bottom: 2px;
    color: #4f46e5;
    font-size: 12px;
    font-weight: 800;
}

.grading-modal-card .modal-title,
.grading-modal-title {
    margin: 0;
    color: #111827;
    font-size: 16px;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.35;
}

.grading-modal-body {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.grading-modal-body > * {
    min-width: 0;
    box-sizing: border-box;
}

.grading-modal-body::-webkit-scrollbar {
    width: 0;
    height: 0;
}

.grading-summary {
    width: 100%;
    box-sizing: border-box;
    padding: 24px;
    border-radius: 12px;
    background: rgba(79, 70, 229, 0.06);
    border: 1px solid rgba(199, 210, 254, 0.7);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

#gradingSummary {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: stretch;
    gap: 16px;
}

.grading-summary-main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    align-items: flex-start;
    flex: 1 1 auto;
    min-width: 0;
}

.grading-summary-side {
    display: flex;
    align-items: stretch;
}

.grading-stats {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    gap: 6px;
    min-width: 128px;
    flex: 0 0 auto;
    text-align: right;
}

.grading-result-text {
    color: #312e81;
    font-size: 15px;
    font-weight: 900;
    letter-spacing: -0.02em;
    line-height: 1.4;
}

.grading-meta {
    color: #667085;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.6;
}

.grading-modal-section-title {
    color: #64748b;
    font-size: 13px;
    font-weight: 800;
    text-align: left;
}

.grading-modal-score {
    color: #4f46e5;
    font-size: 42px;
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 0.95;
    white-space: nowrap;
}

.grading-summary-secondary {
    gap: 10px;
    padding: 0;
    background: transparent;
    border: 0;
}

.grading-stat-row-index {
    display: block;
    color: #98a2b3;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-align: left;
}

.grading-detail-table-wrap {
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    background: #ffffff;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
    overflow: hidden;
}

.grading-detail-table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

.grading-detail-row {
    background: #ffffff;
}

.grading-detail-row + .grading-detail-row {
    border-top: 1px solid #f1f5f9;
}

.grading-detail-cell {
    padding: 14px 16px;
    vertical-align: middle;
}

.grading-detail-cell-text {
    width: auto;
}

.grading-detail-cell-state {
    width: 92px;
    text-align: right;
}

.grading-stat-row-text {
    margin: 2px 0 0;
    color: #344054;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    text-align: left;
    word-break: keep-all;
    white-space: normal;
}

.grading-stat-row-state {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 0;
    min-height: 30px;
    padding: 0 10px;
    border-radius: 999px;
    background: #eef2f7;
    font-size: 11px;
    font-weight: 800;
    color: #667085;
    white-space: nowrap;
}

.grading-stat-row-state svg {
    flex: 0 0 auto;
}

.grading-stat-row.pass .grading-stat-row-state {
    background: #ecfdf3;
    color: #10b981;
}

.grading-stat-row.fail .grading-stat-row-state {
    background: #fdecec;
    color: #c53b2f;
}

.grading-stat-row.pending .grading-stat-row-state {
    background: #eef2f7;
    color: #475467;
}

.grading-detail-row.pass .grading-stat-row-state {
    background: #ecfdf3;
    color: #10b981;
}

.grading-detail-row.fail .grading-stat-row-state {
    background: #fdecec;
    color: #c53b2f;
}

.grading-detail-row.pending .grading-stat-row-state {
    background: #eef2f7;
    color: #475467;
}

.grading-score-stack {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
}

.grading-score-label {
    color: #4f46e5;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.grading-score-summary {
    color: rgba(79, 70, 229, 0.8);
    font-size: 14px;
    font-weight: 600;
    line-height: 1.4;
}

.grading-modal-card .gpt-modal-footer,
.grading-modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 16px;
    margin-top: 0;
    padding: 14px 24px;
    border-top: 1px solid #f1f5f9;
    background: #f8fafc;
}

.grading-modal-card .gpt-modal-confirm,
.grading-modal-confirm {
    min-width: 158px;
    height: 44px;
    padding: 0 24px;
    box-sizing: border-box;
    border: 0;
    border-radius: 12px;
    background: #111827;
    color: #ffffff;
    font-size: 14px;
    font-weight: 800;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.grading-modal-card .gpt-modal-confirm:hover,
.grading-modal-confirm:hover {
    background: #0f172a;
}

.details-message {
    width: 100%;
    box-sizing: border-box;
    min-height: 0;
    max-height: 0;
    overflow: auto;
    margin-top: 0;
    padding: 0;
    border-radius: 0;
    background: transparent;
    border: 0;
    color: #475467;
    font-size: 12px;
    line-height: 1.55;
    text-align: left;
    font-family: ui-monospace, SFMono-Regular, SFMono-Regular, Menlo, Consolas, monospace;
    white-space: normal;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.details-message-hidden {
    display: none !important;
}

.details-message::-webkit-scrollbar {
    width: 0;
    height: 0;
}

@media (max-width: 1180px) {
    .cbt-container {
        flex-direction: column;
        height: auto;
    }

    #left-panel,
    .right-panel {
        width: 100%;
        flex: none;
    }

    #drag-bar {
        display: none !important;
    }

    .submit-panel {
        align-items: stretch;
    }

    .left-bottom-answer-btn {
        width: 100%;
    }

    .grading-modal-card {
        max-height: calc(100vh - 28px);
    }

    .grading-modal-card .terms-modal-header,
    .grading-modal-header {
        padding: 18px;
        padding-right: 56px;
    }

    .grading-modal-title {
        font-size: 16px;
    }

    .grading-modal-score {
        font-size: 34px;
    }

    #gradingSummary {
        grid-template-columns: minmax(0, 1fr) auto;
        align-items: center;
    }

    .grading-stats {
        min-width: 112px;
        align-items: flex-end;
        text-align: right;
    }
}

@media (max-width: 768px) {
    .grading-modal-overlay {
        padding: 0;
    }

    .cbt-title-container {
        margin-top: 64px;
    }

    #cbt-title {
        height: auto;
        padding: 14px 0;
        align-items: flex-start !important;
    }

    .cbt-problemTitle {
        padding-left: 0 !important;
        font-size: 20px;
        max-width: none !important;
    }

    .right-buttons {
        width: 100%;
        justify-content: flex-start;
    }

    .cbt-title-textbtn span {
        display: inline !important;
    }

    .cbt-container {
        padding: 12px;
        gap: 12px;
    }

    .terminal-shell,
    .right-panel-main-content {
        border-radius: 18px;
    }

    .lab-status-bar {
        padding: 12px;
    }

    #containerFrame {
        min-height: 360px;
        height: 360px !important;
    }

    .grading-modal-card {
        width: 100vw;
        max-width: none;
        min-height: 100dvh;
        max-height: 100dvh;
        border-radius: 0;
    }

    .grading-modal-title {
        font-size: 16px;
    }

    .grading-modal-card .terms-modal-close-btn,
    .grading-modal-close {
        top: 16px;
        right: 16px;
    }

    .grading-modal-card .terms-modal-header,
    .grading-modal-header {
        padding: 18px 16px 14px;
        padding-right: 52px;
        text-align: left;
    }

    .grading-modal-score {
        font-size: 36px;
    }

    #gradingSummary {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
        align-items: center;
        gap: 12px;
    }

    .grading-stats {
        width: auto;
        min-width: 0;
        align-items: flex-end;
        text-align: right;
    }

    .grading-detail-table,
    .grading-detail-table tbody,
    .grading-detail-row,
    .grading-detail-cell {
        display: block;
    }

    .grading-modal-body {
        padding: 18px 16px;
    }

    .grading-detail-cell-state {
        width: auto;
        text-align: right;
        padding-top: 8px;
    }

    .grading-stat-row-state {
        margin-left: auto;
    }

    .grading-modal-card .gpt-modal-footer,
    .grading-modal-footer {
        padding: 14px 16px 16px;
    }

    .grading-modal-card .gpt-modal-confirm,
    .grading-modal-confirm {
        width: 100%;
        min-width: 0;
    }
}


/* practice layout override 2026-04-04 */
html, body {
    height: 100%;
    overflow: hidden;
}

body {
    background: #ffffff;
}

.cbt-title-container {
    background: #ffffff;
    border-bottom: 1px solid #eceff3;
}

#cbt-title {
    width: min(1780px, calc(100% - 64px));
    min-width: 0 !important;
}

.cbt-container {
    box-sizing: border-box;
    width: 100%;
    max-width: 1920px;
    margin: 0 auto;
    padding: 18px 24px 24px;
    gap: 24px;
    height: calc(100vh - 135px);
    overflow: hidden;
    align-items: stretch;
    background: #ffffff;
}

#left-panel {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
}

#left-panel-main {
    height: 100%;
    min-height: 0;
}

.terminal-shell {
    height: 100%;
    min-height: 0;
}

#containerFrame {
    min-height: 0;
    height: 100%;
    flex: 1 1 auto;
}

#drag-bar {
    display: none !important;
}

.right-panel {
    width: 720px;
    flex: 0 0 720px;
    min-width: 720px;
    padding-right: 12px;
    overflow: hidden;
    background: transparent;
    border: 0;
    box-shadow: none;
}

.right-panel-main {
    display: flex;
    flex-direction: column;
    gap: 16px;
    height: 100%;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0;
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
}

.right-panel-main::-webkit-scrollbar {
    width: 10px;
}

.right-panel-main::-webkit-scrollbar-thumb {
    background: #d7dce5;
    border-radius: 999px;
    border: 2px solid #ffffff;
}

.right-panel-main-content {
    margin-right: 0;
}

.practice-card {
    padding: 28px 30px;
}

@media (max-width: 1180px) {
    html, body {
        overflow: auto;
    }

    .cbt-container {
        height: auto;
        overflow: visible;
        padding: 16px;
    }

    .right-panel {
        width: 100%;
        min-width: 0;
        flex: none;
    }

    .right-panel-main {
    display: flex;
    flex-direction: column;
    gap: 16px;
    height: 100%;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 2px;
    background: transparent;
    border: 0;
    box-shadow: none;
}
}


/* practice title bar override 2026-04-04b */
body {
    background: #f3f4f6;
}

.cbt-title-container {
    margin-top: 72px;
    background: #ffffff;
    border-bottom: 1px solid #eceff3;
}

#cbt-title {
    width: calc(100% - 36px);
    height: 68px;
    min-width: 0 !important;
}

.cbt-problemTitle {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-left: 4px;
    color: #111827;
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.cbt-problemTitle svg {
    width: 18px;
    height: 18px;
}

.right-buttons {
    display: flex;
    align-items: center;
    gap: 14px;
}

.cbt-title-textbtn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    min-height: 40px;
    padding: 0;
    margin-right: 0;
    color: #6b7280;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.cbt-title-textbtn > svg {
    width: 15px;
    height: 15px;
    margin-right: 0;
}

#askGPTButton .badge {
    margin-left: 1px;
    color: #94a3b8;
    font-size: 11px;
    font-weight: 700;
}

#manage-container-btn {
    min-width: 126px;
    height: 44px;
    padding: 0 20px;
    border-radius: 16px;
    border: 1px solid #d9dee8;
    background: #ffffff;
    color: #374151;
    font-size: 14px;
    font-weight: 800;
    box-shadow: none;
}

.cbt-container {
    background: #f3f4f6;
    padding: 20px 18px 22px;
    gap: 18px;
    height: calc(100vh - 140px);
}


/* final cleanup override 2026-04-04c */
.cbt-container {
    background: #f3f4f6 !important;
}

.right-panel {
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    padding-right: 0 !important;
}

.right-panel-main {
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    padding: 0 !important;
}

#manage-container-btn {
    min-width: 112px !important;
    height: 42px !important;
    padding: 0 16px !important;
    border-radius: 14px !important;
    font-size: 13px !important;
}

/* right panel compact override 2026-04-04d */
#right-panel {
    height: 100% !important;
    align-self: stretch !important;
}

#right-panel-main {
    height: 100% !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
    padding-right: 2px !important;
}

.right-panel-main-content {
    margin-right: 0 !important;
}

.practice-card {
    padding: 24px 26px !important;
}

.right-panel-section-title {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin-bottom: 14px;
}

.right-panel-title-wrap {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #111827;
    font-size: 15px;
    font-weight: 800;
}

.right-panel-body.static-body {
    display: block !important;
    padding-top: 0 !important;
}

.problemDescription {
    margin: 0 !important;
    color: #475467 !important;
    font-size: 15px !important;
    line-height: 1.75 !important;
}

.requirements-copy {
    line-height: 1.9 !important;
}


/* status bar submit emphasis override 2026-04-04e */
.lab-status-bar {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 14px !important;
    padding: 14px 24px 12px !important;
    background: #1f1f1f !important;
    border-bottom: 1px solid #303030 !important;
}

.lab-status-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.lab-status-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: auto;
}

.lab-status-item {
    background: #262626 !important;
    border: 1px solid #303030;
    color: #f5f5f5 !important;
}

.lab-status-reset-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background: #262626 !important;
    color: #f3f4f6 !important;
    transition: background-color .16s ease, border-color .16s ease, box-shadow .16s ease, transform .16s ease;
}

.lab-status-reset-btn:hover {
    cursor: pointer;
    background: #2c2c2c !important;
    border-color: #3b3b3b;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.03) inset;
    transform: translateY(-1px);
}

.lab-status-reset-btn:focus-visible {
    outline: none;
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.18);
}

.lab-status-reset-btn svg {
    flex: 0 0 auto;
    color: #9ca3af;
}

.lab-status-label {
    color: #9ca3af !important;
}

.lab-status-value {
    color: #ffffff !important;
}

.lab-status-item-grading {
    min-width: 126px;
    justify-content: center;
    transition: background-color .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.lab-status-item-grading.is-pending {
    background: #2b2b2b !important;
    border-color: #3a3a3a;
}

.lab-status-item-grading.is-pending .lab-status-value {
    color: #f3f4f6 !important;
}

.lab-status-item-grading.is-success {
    background: rgba(34, 197, 94, 0.16) !important;
    border-color: rgba(34, 197, 94, 0.42);
    box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.08) inset;
}

.lab-status-item-grading.is-success .lab-status-label,
.lab-status-item-grading.is-success .lab-status-value {
    color: #86efac !important;
}

.lab-status-item-grading.is-fail {
    background: rgba(239, 68, 68, 0.14) !important;
    border-color: rgba(239, 68, 68, 0.42);
    box-shadow: 0 0 0 1px rgba(239, 68, 68, 0.08) inset;
}

.lab-status-item-grading.is-fail .lab-status-label,
.lab-status-item-grading.is-fail .lab-status-value {
    color: #fca5a5 !important;
}

.lab-status-item-grading.is-error {
    background: rgba(245, 158, 11, 0.14) !important;
    border-color: rgba(245, 158, 11, 0.42);
}

.lab-status-item-grading.is-error .lab-status-label,
.lab-status-item-grading.is-error .lab-status-value {
    color: #fcd34d !important;
}

.status-action-btn {
    height: 42px;
    padding: 0 18px;
    border-radius: 12px;
    border: 1px solid transparent;
    font-size: 14px;
    font-weight: 800;
    letter-spacing: -0.02em;
    transition: transform .16s ease, background-color .16s ease, border-color .16s ease, opacity .16s ease;
}

.status-action-btn:hover {
    cursor: pointer;
    transform: translateY(-1px);
}

.status-action-btn:disabled,
.status-action-btn.is-loading {
    opacity: 0.72;
    cursor: wait;
    transform: none;
}

.status-action-btn.primary {
    min-width: 128px;
    background: linear-gradient(180deg, #3f76ff 0%, #2858e6 100%);
    color: #ffffff;
    box-shadow: 0 10px 24px rgba(40, 88, 230, 0.24);
}

.status-action-btn.primary:hover {
    background: linear-gradient(180deg, #4a80ff 0%, #2f5dec 100%);
}

.status-action-btn.secondary {
    background: #262626;
    border-color: #3a3a3a;
    color: #e5e7eb;
}

.status-action-btn.secondary:hover {
    background: #2f2f2f;
}

.submit-panel-guide {
    align-items: flex-start !important;
}

.submit-panel-guide .submit-panel-label {
    color: #111827;
}

.submit-panel-guide .submit-panel-meta {
    max-width: 360px;
}

@media (max-width: 768px) {
    .lab-status-bar {
        align-items: stretch !important;
    }

    .lab-status-actions {
        width: 100%;
        margin-left: 0;
    }

    .status-action-btn {
        flex: 1;
    }
}


/* grading result card override 2026-04-04f */
.grading-panel-body {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.grading-panel-action-only {
    align-items: stretch;
}

.grading-panel-summary-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.grading-panel-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 88px;
    height: 34px;
    padding: 0 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 800;
}

.grading-panel-badge.pending { background: #eef2f7; color: #475467; }
.grading-panel-badge.success { background: #e8f6ed; color: #167c3b; }
.grading-panel-badge.fail { background: #fdecec; color: #c53b2f; }
.grading-panel-badge.error { background: #fff4db; color: #b96a00; }

.grading-panel-score {
    color: #111827;
    font-size: 24px;
    font-weight: 900;
    letter-spacing: -0.03em;
}

.grading-panel-meta {
    margin: 0;
    color: #667085;
    font-size: 13px;
    line-height: 1.6;
}

.grading-panel-actions {
    display: flex;
    gap: 12px;
    margin-top: 4px;
}

.grading-panel-actions .status-action-btn {
    flex: 1;
}

/* layout width sync 2026-04-04d */
.cbt-container {
    width: min(1920px, 100%) !important;
    max-width: 1920px !important;
    margin-left: auto !important;
    margin-right: auto !important;
}

#cbt-title {
    width: min(1920px, calc(100% - 36px)) !important;
    min-width: 0 !important;
    max-width: 1920px !important;
    margin-left: auto !important;
    margin-right: auto !important;
}


/* right panel sticky submit layout 2026-04-05 */
#right-panel {
    display: grid !important;
    grid-template-rows: minmax(0, 2fr) minmax(0, 2fr) minmax(0, 2fr) minmax(0, 1fr) !important;
    gap: 14px !important;
    min-height: 0 !important;
    height: 100% !important;
    overflow: hidden !important;
    box-sizing: border-box !important;
}

#right-panel > * {
    min-height: 0 !important;
}

#right-panel-main {
    display: contents !important;
    min-height: 0 !important;
    height: auto !important;
    overflow: visible !important;
    padding-right: 0 !important;
}

.right-panel-main-content {
    display: flex !important;
    flex-direction: column !important;
    min-height: 0 !important;
    height: 100% !important;
    overflow: hidden !important;
    box-sizing: border-box !important;
}

.practice-card {
    min-height: 0 !important;
    height: 100% !important;
    padding: 18px 22px !important;
    box-sizing: border-box !important;
}

.right-panel-body.static-body {
    flex: 1 1 auto !important;
    min-height: 0 !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
    padding-right: 4px !important;
}

.right-panel-submit-bar {
    min-height: 0 !important;
    display: flex !important;
    justify-content: flex-end !important;
    align-items: flex-end !important;
    padding: 0 !important;
    border: 0 !important;
    background: transparent !important;
    box-shadow: none !important;
    overflow: hidden !important;
    box-sizing: border-box !important;
}

.fixed-submit-actions {
    width: 100% !important;
    justify-content: flex-end !important;
    align-items: flex-end !important;
    margin: 0 !important;
}

.fixed-submit-actions .status-action-btn {
    flex: 0 0 auto;
}

.submit-button-floating {
    min-width: 220px;
    height: 52px;
    border-radius: 16px;
}

@media (max-width: 1280px) {
    .cbt-container {
        flex-direction: column !important;
        height: auto !important;
        overflow: visible !important;
    }

    #left-panel,
    .right-panel {
        width: 100% !important;
        min-width: 0 !important;
        flex: none !important;
    }

    #left-panel {
        min-height: 56vh !important;
    }

    #containerFrame {
        min-height: 52vh !important;
    }

    #right-panel {
        min-height: 720px !important;
    }
}

@media (max-width: 768px) {
    #right-panel {
        display: flex !important;
        flex-direction: column !important;
        gap: 12px !important;
        height: auto !important;
        min-height: 0 !important;
        overflow: visible !important;
    }

    #right-panel-main {
        display: flex !important;
        flex-direction: column !important;
        gap: 12px !important;
    }

    .right-panel-body.static-body {
        min-height: 140px !important;
        max-height: 220px !important;
    }

    .right-panel-submit-bar {
        width: 100% !important;
        padding: 0 !important;
        justify-content: stretch !important;
        align-items: stretch !important;
        box-sizing: border-box !important;
    }

    .fixed-submit-actions {
        display: flex !important;
        width: 100% !important;
        flex-direction: column !important;
        align-items: stretch !important;
        justify-content: stretch !important;
        gap: 10px !important;
        margin: 0 !important;
        padding: 0 16px !important;
        box-sizing: border-box !important;
    }

    .fixed-submit-actions .status-action-btn,
    .submit-button-floating {
        width: 100% !important;
    }

    .right-panel-submit-bar,
    .grading-panel-actions.fixed-submit-actions {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
    }

    .fixed-submit-actions .status-action-btn,
    .submit-button-floating,
    #submitButton,
    #checkButton {
        min-width: 0 !important;
        max-width: none !important;
        flex: 1 1 auto !important;
        box-sizing: border-box !important;
        margin: 0 !important;
    }
}



/* title gap removal 2026-04-05e */
.cbt-title-container,
.cbt-title-container.dark {
    margin-top: 64px !important;
}

.cbt-container {
    height: calc(100dvh - 126px) !important;
}

@media (max-width: 1280px) {
    .cbt-container {
        height: auto !important;
    }
}

/* tablet layout should stay desktop-like 2026-04-10 */
@media (min-width: 769px) and (max-width: 1280px) {
    html,
    body {
        height: 100% !important;
        overflow: hidden !important;
    }

    .cbt-container {
        display: flex !important;
        flex-direction: row !important;
        align-items: stretch !important;
        width: min(1920px, 100%) !important;
        height: calc(100dvh - 126px) !important;
        min-height: 0 !important;
        overflow: hidden !important;
        padding: 18px !important;
        gap: 18px !important;
    }

    #left-panel,
    .right-panel {
        min-height: 0 !important;
        height: 100% !important;
        max-width: none !important;
    }

    #left-panel {
        flex: 1 1 auto !important;
        width: auto !important;
        min-width: 0 !important;
    }

    #containerFrame {
        min-height: 0 !important;
        height: 100% !important;
    }

    #right-panel,
    .right-panel {
        display: grid !important;
        grid-template-rows: minmax(0, 2fr) minmax(0, 2fr) minmax(0, 2fr) minmax(52px, 0.7fr) !important;
        flex: 0 0 clamp(420px, 44vw, 560px) !important;
        width: clamp(420px, 44vw, 560px) !important;
        min-width: 420px !important;
        overflow: hidden !important;
    }

    #right-panel-main {
        display: contents !important;
    }

    .right-panel-main-content {
        min-height: 0 !important;
        height: 100% !important;
    }

    .right-panel-body.static-body {
        min-height: 0 !important;
        max-height: none !important;
        overflow-y: auto !important;
    }

    .right-panel-submit-bar {
        width: 100% !important;
        padding: 0 !important;
        align-items: flex-end !important;
        justify-content: flex-end !important;
    }

    .fixed-submit-actions {
        width: 100% !important;
        padding: 0 !important;
        flex-direction: row !important;
        align-items: flex-end !important;
        justify-content: flex-end !important;
    }

    .submit-button-floating {
        width: auto !important;
        min-width: 180px !important;
    }
}

/* compact mobile CBT title actions 2026-04-10 */
@media (max-width: 768px) {
    #cbt-title {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: space-between !important;
        width: calc(100% - 32px) !important;
        min-width: 0 !important;
        height: 64px !important;
        margin-left: 16px !important;
        margin-right: 16px !important;
        padding: 0 !important;
        gap: 10px !important;
        overflow: hidden !important;
    }

    .cbt-problemTitle {
        flex: 1 1 auto !important;
        min-width: 0 !important;
        max-width: none !important;
        padding: 0 !important;
        margin: 0 !important;
        overflow: hidden !important;
        white-space: nowrap !important;
        font-size: 20px !important;
        line-height: 1.1 !important;
        text-align: left !important;
    }

    .cbt-problemTitle .linux-exercise {
        flex: 0 0 auto !important;
    }

    .cbt-problemTitle svg {
        margin-left: 0 !important;
    }

    .problem-title-text {
        flex: 1 1 auto !important;
        display: block !important;
        min-width: 0 !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
        white-space: nowrap !important;
        will-change: transform;
    }

    .cbt-problemTitle.is-title-overflowing .problem-title-text {
        overflow: visible !important;
        text-overflow: clip !important;
        animation: cbtTitleFlow 8s ease-in-out infinite alternate;
    }

    .right-buttons {
        flex: 0 0 auto !important;
        width: auto !important;
        min-width: 0 !important;
        justify-content: flex-end !important;
        align-items: center !important;
        gap: 6px !important;
        padding: 0 !important;
        flex-wrap: nowrap !important;
    }

    .cbt-title-textbtn {
        width: 34px !important;
        min-width: 34px !important;
        height: 34px !important;
        min-height: 34px !important;
        padding: 0 !important;
        margin: 0 !important;
        gap: 0 !important;
        border-radius: 999px !important;
        background: #f6f7f9 !important;
    }

    .cbt-title-textbtn > svg {
        width: 16px !important;
        height: 16px !important;
        margin: 0 !important;
    }

    .cbt-title-textbtn > span:not(.badge) {
        display: none !important;
    }

    #askGPTButton {
        width: auto !important;
        min-width: 42px !important;
        padding: 0 8px !important;
        gap: 4px !important;
    }

    #creditBadge {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        min-width: 0 !important;
        padding: 0 !important;
        font-size: 10px !important;
        line-height: 1 !important;
        color: #6b7280 !important;
        background: transparent !important;
    }
}

@keyframes cbtTitleFlow {
    0%,
    18% {
        transform: translateX(0);
    }

    82%,
    100% {
        transform: translateX(-32%);
    }
}

/* mobile CBT structure refresh 2026-04-10c */
@media (max-width: 768px) {
    .cbt-title-container,
    .cbt-title-container.dark {
        margin-top: 64px !important;
        background: #ffffff !important;
        border-bottom: 1px solid #e5e7eb !important;
    }

    #cbt-title {
        display: flex !important;
        flex-direction: column !important;
        align-items: stretch !important;
        justify-content: flex-start !important;
        width: 100% !important;
        min-width: 0 !important;
        height: auto !important;
        margin: 0 !important;
        padding: 16px 16px 12px !important;
        gap: 12px !important;
        overflow: visible !important;
        box-sizing: border-box !important;
    }

    .cbt-problemTitle {
        display: flex !important;
        align-items: flex-start !important;
        width: 100% !important;
        min-width: 0 !important;
        max-width: none !important;
        margin: 0 !important;
        padding: 0 !important;
        gap: 12px !important;
        overflow: visible !important;
        white-space: normal !important;
        color: #111827 !important;
        font-size: 18px !important;
        font-weight: 900 !important;
        line-height: 1.25 !important;
        letter-spacing: -0.04em !important;
        text-align: left !important;
    }

    .cbt-problemTitle .linux-exercise {
        flex: 0 0 28px !important;
        width: 28px !important;
        height: 28px !important;
        margin-top: 0 !important;
        color: #111827 !important;
    }

    .cbt-problemTitle svg {
        width: 24px !important;
        height: 24px !important;
        margin: 0 !important;
    }

    .problem-title-text,
    .cbt-problemTitle.is-title-overflowing .problem-title-text {
        display: block !important;
        flex: 1 1 auto !important;
        min-width: 0 !important;
        overflow: visible !important;
        text-overflow: clip !important;
        white-space: normal !important;
        animation: none !important;
        transform: none !important;
    }

    .right-buttons {
        display: flex !important;
        flex: 0 0 auto !important;
        width: 100% !important;
        min-width: 0 !important;
        justify-content: flex-start !important;
        align-items: center !important;
        gap: 18px !important;
        padding: 0 0 0 40px !important;
        flex-wrap: nowrap !important;
        box-sizing: border-box !important;
    }

    .cbt-title-textbtn {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        width: auto !important;
        min-width: 0 !important;
        height: 28px !important;
        min-height: 28px !important;
        padding: 0 !important;
        margin: 0 !important;
        gap: 5px !important;
        border-radius: 0 !important;
        background: transparent !important;
        color: #6b7280 !important;
        font-size: 13px !important;
        font-weight: 800 !important;
        letter-spacing: -0.02em !important;
    }

    .cbt-title-textbtn > svg {
        width: 16px !important;
        height: 16px !important;
        margin: 0 !important;
    }

    .cbt-title-textbtn > span:not(.badge) {
        display: inline-flex !important;
    }

    #askGPTButton {
        margin-left: auto !important;
        width: auto !important;
        min-width: 0 !important;
        padding: 0 !important;
        gap: 5px !important;
    }

    #creditBadge {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        min-width: 0 !important;
        margin-left: 2px !important;
        padding: 0 !important;
        background: transparent !important;
        color: #9ca3af !important;
        font-size: 11px !important;
        font-weight: 800 !important;
        line-height: 1 !important;
    }

    .cbt-container {
        padding: 14px 12px 96px !important;
        gap: 12px !important;
        background: #f3f4f6 !important;
    }

    #left-panel {
        min-height: 0 !important;
    }

    .terminal-shell {
        border-radius: 18px !important;
    }

    .terminal-shell-top {
        min-height: 48px !important;
        padding: 0 16px !important;
    }

    .lab-status-bar {
        padding: 12px !important;
    }

    .lab-status-summary {
        gap: 8px !important;
    }

    .lab-status-item {
        min-height: 34px !important;
        padding: 0 12px !important;
        font-size: 12px !important;
    }

    #manage-container-btn {
        min-width: 0 !important;
        margin-left: auto !important;
        padding: 0 12px !important;
    }

    #right-panel,
    .right-panel {
        min-height: 0 !important;
        padding: 0 !important;
    }

    #right-panel-main {
        display: flex !important;
        flex-direction: column !important;
        gap: 12px !important;
    }

    .right-panel-main-content,
    .practice-card {
        height: auto !important;
        min-height: 0 !important;
        padding: 16px !important;
        border-radius: 18px !important;
        border: 1px solid #edf0f4 !important;
        background: #ffffff !important;
        box-shadow: 0 3px 12px rgba(148, 163, 184, 0.07) !important;
    }

    .right-panel-section-title {
        margin: 0 0 10px !important;
        font-size: 15px !important;
        line-height: 1.2 !important;
    }

    .right-panel-title-wrap {
        gap: 8px !important;
    }

    .right-panel-icon {
        font-size: 17px !important;
    }

    .right-panel-body.static-body {
        min-height: 0 !important;
        max-height: 190px !important;
        padding-right: 4px !important;
        font-size: 14px !important;
        line-height: 1.65 !important;
    }

    .problemDescription {
        font-size: 14px !important;
        line-height: 1.65 !important;
    }

    .right-panel-submit-bar {
        position: fixed !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        z-index: 990 !important;
        width: 100% !important;
        padding: 12px 16px calc(12px + env(safe-area-inset-bottom)) !important;
        background: rgba(255, 255, 255, 0.92) !important;
        border-top: 1px solid #e5e7eb !important;
        box-shadow: 0 -10px 26px rgba(15, 23, 42, 0.08) !important;
        backdrop-filter: blur(14px) !important;
        -webkit-backdrop-filter: blur(14px) !important;
        box-sizing: border-box !important;
    }

    .fixed-submit-actions {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: center !important;
        width: 100% !important;
        gap: 10px !important;
        padding: 0 !important;
        margin: 0 !important;
    }

    .fixed-submit-actions .status-action-btn,
    .submit-button-floating,
    #submitButton,
    #checkButton {
        width: 100% !important;
        min-width: 0 !important;
        height: 54px !important;
        margin: 0 !important;
        border-radius: 16px !important;
        font-size: 16px !important;
        font-weight: 900 !important;
        flex: 1 1 0 !important;
    }

    #submitButton {
        flex-grow: 1.35 !important;
    }
}

/* desktop CBT workspace refresh 2026-04-10d */
@media (min-width: 769px) {
    body {
        background: #f8fafc !important;
        overflow: hidden !important;
    }

    .cbt-title-container,
    .cbt-title-container.dark {
        margin-top: 64px !important;
        background: #ffffff !important;
        border-bottom: 1px solid #e5e7eb !important;
        box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03) !important;
    }

    #cbt-title {
        width: min(1800px, calc(100% - 64px)) !important;
        height: 72px !important;
        gap: 24px !important;
        padding: 0 !important;
    }

    .cbt-problemTitle {
        flex: 1 1 auto !important;
        min-width: 0 !important;
        padding-left: 0 !important;
        color: #111827 !important;
        font-size: 20px !important;
        font-weight: 900 !important;
        line-height: 1.2 !important;
        letter-spacing: -0.04em !important;
        white-space: nowrap !important;
        overflow: hidden !important;
    }

    .cbt-problemTitle .linux-exercise {
        width: 36px !important;
        height: 36px !important;
        border-radius: 10px !important;
        color: #4b5563 !important;
        transition: background-color .16s ease, color .16s ease;
    }

    .cbt-problemTitle .linux-exercise:hover {
        background: #f3f4f6 !important;
        color: #111827 !important;
    }

    .cbt-problemTitle svg {
        width: 24px !important;
        height: 24px !important;
        margin: 0 !important;
    }

    .problem-title-text {
        overflow: hidden !important;
        text-overflow: ellipsis !important;
        white-space: nowrap !important;
    }

    .right-buttons {
        display: flex !important;
        align-items: center !important;
        justify-content: flex-end !important;
        gap: 18px !important;
        width: auto !important;
        flex: 0 0 auto !important;
        padding: 0 !important;
        flex-wrap: nowrap !important;
    }

    .cbt-title-textbtn {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        min-width: 0 !important;
        min-height: 36px !important;
        height: 36px !important;
        padding: 0 !important;
        margin: 0 !important;
        gap: 7px !important;
        border-radius: 0 !important;
        background: transparent !important;
        color: #4b5563 !important;
        font-size: 14px !important;
        font-weight: 800 !important;
        letter-spacing: -0.02em !important;
    }

    .cbt-title-textbtn:hover {
        color: #111827 !important;
        background: transparent !important;
    }

    .cbt-title-textbtn > svg {
        width: 18px !important;
        height: 18px !important;
        margin: 0 !important;
    }

    #recommendButton:hover {
        color: #ef4444 !important;
    }

    #bookmarkButton:hover {
        color: #2563eb !important;
    }

    #askGPTButton {
        color: #111827 !important;
        font-weight: 900 !important;
    }

    #creditBadge {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        margin-left: 2px !important;
        padding: 3px 7px !important;
        border-radius: 999px !important;
        background: #eff6ff !important;
        color: #2563eb !important;
        font-size: 11px !important;
        font-weight: 900 !important;
        line-height: 1 !important;
    }

    .cbt-container {
        display: flex !important;
        flex-direction: row !important;
        align-items: stretch !important;
        width: min(1800px, 100%) !important;
        max-width: 1800px !important;
        height: calc(100dvh - 137px) !important;
        min-height: 0 !important;
        margin: 0 auto !important;
        padding: 24px !important;
        gap: 24px !important;
        overflow: hidden !important;
        background: #f8fafc !important;
        box-sizing: border-box !important;
    }

    #left-panel {
        flex: 1 1 auto !important;
        min-width: 560px !important;
        height: 100% !important;
        min-height: 0 !important;
        overflow: hidden !important;
    }

    #left-panel-main {
        height: 100% !important;
        min-height: 0 !important;
    }

    .terminal-shell {
        height: 100% !important;
        min-height: 0 !important;
        border-radius: 18px !important;
        border: 1px solid #111827 !important;
        background: #1e1e1e !important;
        box-shadow: 0 18px 46px rgba(15, 23, 42, 0.16) !important;
        overflow: hidden !important;
    }

    .terminal-shell-top {
        min-height: 58px !important;
        padding: 0 22px !important;
        background: #2d2d2d !important;
        border-bottom: 1px solid #404040 !important;
    }

    .terminal-lights {
        gap: 8px !important;
    }

    .terminal-light {
        width: 12px !important;
        height: 12px !important;
    }

    .terminal-shell-title {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        height: 28px !important;
        padding: 0 12px !important;
        border: 1px solid #404040 !important;
        border-radius: 8px !important;
        background: #1e1e1e !important;
        color: #a1a1aa !important;
        font-size: 12px !important;
        font-weight: 800 !important;
        letter-spacing: .04em !important;
    }

    .lab-status-bar {
        padding: 14px 22px !important;
        background: #2a2a2a !important;
        border-bottom: 1px solid #3a3a3a !important;
    }

    .lab-status-summary {
        width: 100% !important;
        gap: 10px !important;
    }

    .lab-status-item {
        min-height: 34px !important;
        padding: 0 12px !important;
        border: 1px solid #3f3f46 !important;
        border-radius: 8px !important;
        background: #1f2937 !important;
        color: #e5e7eb !important;
        font-size: 12px !important;
        font-weight: 800 !important;
    }

    .lab-status-label {
        color: #9ca3af !important;
    }

    .lab-status-value {
        color: #e5e7eb !important;
    }

    #sessionStatusText {
        color: #4ade80 !important;
    }

    #manage-container-btn {
        margin-left: auto !important;
        min-width: 118px !important;
        height: 36px !important;
        padding: 0 14px !important;
        border-color: #52525b !important;
        background: #3a3a3a !important;
        color: #e5e7eb !important;
        border-radius: 8px !important;
        box-shadow: none !important;
    }

    #manage-container-btn:hover {
        background: #4a4a4a !important;
    }

    #containerFrame {
        min-height: 0 !important;
        height: 100% !important;
        flex: 1 1 auto !important;
    }

    #right-panel,
    .right-panel {
        display: grid !important;
        grid-template-rows: minmax(0, 1fr) auto !important;
        flex: 0 0 clamp(420px, 27vw, 500px) !important;
        width: clamp(420px, 27vw, 500px) !important;
        min-width: 420px !important;
        height: 100% !important;
        min-height: 0 !important;
        padding: 0 !important;
        gap: 0 !important;
        overflow: hidden !important;
        background: transparent !important;
    }

    #right-panel-main {
        display: flex !important;
        flex-direction: column !important;
        gap: 16px !important;
        height: 100% !important;
        min-height: 0 !important;
        overflow-y: auto !important;
        overflow-x: hidden !important;
        padding: 0 8px 104px 0 !important;
        box-sizing: border-box !important;
    }

    #right-panel-main::-webkit-scrollbar {
        width: 6px !important;
    }

    #right-panel-main::-webkit-scrollbar-track {
        background: transparent !important;
    }

    #right-panel-main::-webkit-scrollbar-thumb {
        background: #cbd5e1 !important;
        border: 0 !important;
        border-radius: 999px !important;
    }

    .right-panel-main-content,
    .practice-card {
        height: auto !important;
        min-height: 0 !important;
        padding: 24px !important;
        border: 1px solid #e5e7eb !important;
        border-radius: 18px !important;
        background: #ffffff !important;
        box-shadow: 0 3px 12px rgba(148, 163, 184, 0.08) !important;
        overflow: visible !important;
    }

    .right-panel-section-title {
        margin: 0 0 14px !important;
        padding: 0 0 12px !important;
        border-bottom: 1px solid #f3f4f6 !important;
    }

    .right-panel-title-wrap {
        gap: 10px !important;
        color: #111827 !important;
        font-size: 17px !important;
        font-weight: 900 !important;
    }

    .right-panel-icon {
        width: 32px !important;
        height: 32px !important;
        border-radius: 10px !important;
        font-size: 16px !important;
        font-weight: 900 !important;
    }

    .right-panel-icon.icon-blue {
        background: #eff6ff !important;
        color: #2563eb !important;
    }

    .right-panel-icon.icon-amber {
        background: #fff7ed !important;
        color: #ea580c !important;
    }

    .right-panel-icon.icon-violet {
        background: #faf5ff !important;
        color: #9333ea !important;
    }

    .right-panel-body.static-body {
        min-height: 0 !important;
        max-height: none !important;
        flex: 0 0 auto !important;
        overflow: visible !important;
        padding: 0 !important;
    }

    .problemDescription {
        margin: 0 !important;
        color: #374151 !important;
        font-size: 15px !important;
        line-height: 1.75 !important;
    }

    .right-panel-submit-bar {
        position: relative !important;
        left: auto !important;
        right: auto !important;
        bottom: auto !important;
        z-index: 1 !important;
        width: 100% !important;
        min-height: 100px !important;
        padding: 28px 0 8px !important;
        align-items: flex-end !important;
        justify-content: stretch !important;
        background: linear-gradient(to top, #f8fafc 0%, #f8fafc 72%, rgba(248, 250, 252, 0) 100%) !important;
        border: 0 !important;
        box-shadow: none !important;
        overflow: visible !important;
    }

    .fixed-submit-actions {
        display: flex !important;
        flex-direction: row !important;
        width: 100% !important;
        gap: 10px !important;
        padding: 0 !important;
        margin: 0 !important;
        align-items: flex-end !important;
        justify-content: stretch !important;
    }

    .fixed-submit-actions .status-action-btn,
    .submit-button-floating,
    #submitButton,
    #checkButton {
        width: 100% !important;
        min-width: 0 !important;
        height: 56px !important;
        margin: 0 !important;
        border-radius: 16px !important;
        font-size: 16px !important;
        font-weight: 900 !important;
        flex: 1 1 0 !important;
    }

    #submitButton {
        flex-grow: 1.4 !important;
        background: linear-gradient(180deg, #3675ff 0%, #2857e8 100%) !important;
        box-shadow: 0 14px 28px rgba(37, 99, 235, 0.22) !important;
    }
}

/* desktop right panel overflow fix 2026-04-10e */
@media (min-width: 769px) {
    #right-panel,
    .right-panel {
        display: grid !important;
        grid-template-rows: auto minmax(0, 1fr) auto !important;
        overflow: hidden !important;
    }

    .right-panel-anchor-nav {
        display: flex !important;
        flex: 0 0 auto !important;
        flex-wrap: wrap !important;
        gap: 8px !important;
        padding: 0 8px 12px 0 !important;
        min-width: 0 !important;
        overflow: hidden !important;
    }

    .right-panel-anchor-link {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        height: 30px !important;
        padding: 0 11px !important;
        border: 1px solid #e5e7eb !important;
        border-radius: 999px !important;
        background: #ffffff !important;
        color: #475569 !important;
        font-size: 12px !important;
        font-weight: 900 !important;
        line-height: 1 !important;
        cursor: pointer !important;
        transition: border-color .16s ease, color .16s ease, background .16s ease !important;
        white-space: nowrap !important;
    }

    .right-panel-anchor-link:hover,
    .right-panel-anchor-link.active {
        border-color: #bfdbfe !important;
        background: #eff6ff !important;
        color: #2563eb !important;
    }

    #right-panel-main {
        gap: 10px !important;
        height: 100% !important;
        min-height: 0 !important;
        padding: 4px 8px 12px 4px !important;
        overflow-y: auto !important;
        overflow-x: hidden !important;
        scroll-behavior: smooth !important;
    }

    .right-panel-main-content,
    .practice-card {
        flex: 0 0 auto !important;
        height: auto !important;
        min-height: 0 !important;
        max-height: none !important;
        padding: 16px 18px !important;
        border-radius: 16px !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
    }

    .practice-card.is-focused {
        outline: 2px solid rgba(37, 99, 235, .35) !important;
        outline-offset: -2px !important;
        box-shadow: inset 0 0 0 4px rgba(37, 99, 235, .08), 0 3px 12px rgba(148, 163, 184, .08) !important;
    }

    .right-panel-section-title {
        margin: 0 0 8px !important;
        padding: 0 0 8px !important;
    }

    .right-panel-title-wrap {
        gap: 8px !important;
        font-size: 15px !important;
        line-height: 1.2 !important;
    }

    .right-panel-icon {
        width: 28px !important;
        height: 28px !important;
        border-radius: 9px !important;
        font-size: 14px !important;
        flex: 0 0 28px !important;
    }

    .right-panel-body.static-body {
        display: block !important;
        min-height: 0 !important;
        max-height: clamp(110px, 18dvh, 190px) !important;
        overflow-y: auto !important;
        overflow-x: hidden !important;
        padding: 0 4px 0 0 !important;
        box-sizing: border-box !important;
    }

    .right-panel-body.static-body::-webkit-scrollbar {
        width: 5px !important;
    }

    .right-panel-body.static-body::-webkit-scrollbar-track {
        background: transparent !important;
    }

    .right-panel-body.static-body::-webkit-scrollbar-thumb {
        background: #cbd5e1 !important;
        border-radius: 999px !important;
    }

    .problemDescription,
    .requirements-copy {
        max-width: 100% !important;
        margin: 0 !important;
        font-size: 14px !important;
        line-height: 1.58 !important;
        overflow-wrap: anywhere !important;
        word-break: keep-all !important;
    }

    .right-panel-submit-bar {
        min-height: 76px !important;
        padding: 16px 0 0 !important;
        overflow: hidden !important;
    }
}

@media (max-width: 768px) {
    .right-panel-anchor-nav {
        display: flex !important;
        flex-wrap: nowrap !important;
        gap: 8px !important;
        padding: 0 2px 2px !important;
        overflow-x: auto !important;
        scrollbar-width: none !important;
    }

    .right-panel-anchor-nav::-webkit-scrollbar {
        display: none !important;
    }

    .right-panel-anchor-link {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        height: 30px !important;
        padding: 0 11px !important;
        border: 1px solid #e5e7eb !important;
        border-radius: 999px !important;
        background: #ffffff !important;
        color: #475569 !important;
        font-size: 12px !important;
        font-weight: 900 !important;
        white-space: nowrap !important;
        flex: 0 0 auto !important;
    }

    .right-panel-anchor-link.active {
        border-color: #bfdbfe !important;
        background: #eff6ff !important;
        color: #2563eb !important;
    }

    .practice-card.is-focused {
        outline: 2px solid rgba(37, 99, 235, .35) !important;
        outline-offset: -2px !important;
        box-shadow: inset 0 0 0 4px rgba(37, 99, 235, .08) !important;
    }
}

.cbt-ai-tutor-btn {
    gap: 7px !important;
    padding: 0 10px !important;
    border-radius: 999px !important;
    background: #f5f7ff !important;
    color: #4f46e5 !important;
    font-weight: 900 !important;
}

.cbt-ai-tutor-btn:hover {
    background: #eef2ff !important;
    color: #4338ca !important;
}

.cbt-ai-tutor-icon {
    width: 16px !important;
    height: 16px !important;
    color: currentColor !important;
}

.cbt-ai-tutor-label {
    color: #111827;
    font-weight: 900;
}

#askGPTButton.cbt-ai-tutor-btn .badge {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    margin-left: 0 !important;
    padding: 3px 8px !important;
    border-radius: 999px !important;
    background: #e0e7ff !important;
    color: #2563eb !important;
    font-size: 11px !important;
    font-weight: 900 !important;
    line-height: 1 !important;
}

@media (max-width: 768px) {
    #askGPTButton.cbt-ai-tutor-btn {
        min-width: 54px !important;
        padding: 0 8px !important;
        gap: 4px !important;
        background: #f5f7ff !important;
        color: #4f46e5 !important;
    }

    #askGPTButton.cbt-ai-tutor-btn .cbt-ai-tutor-label {
        display: none !important;
    }

    #askGPTButton.cbt-ai-tutor-btn .badge {
        padding: 0 !important;
        background: transparent !important;
        color: #2563eb !important;
        font-size: 10px !important;
    }
}

/* CBT title and lab reset compact tuning 2026-04-10g */
#manage-container-btn.lab-status-reset-btn {
    width: auto !important;
    min-width: 0 !important;
    max-width: max-content !important;
    flex: 0 0 auto !important;
    padding: 0 12px !important;
    gap: 6px !important;
}

@media (min-width: 769px) {
    .cbt-problemTitle {
        font-size: 18px !important;
        line-height: 1.18 !important;
    }

    .cbt-problemTitle .linux-exercise {
        width: 30px !important;
        height: 30px !important;
        flex: 0 0 30px !important;
        border-radius: 8px !important;
    }

    .cbt-problemTitle svg {
        width: 20px !important;
        height: 20px !important;
    }

    #manage-container-btn.lab-status-reset-btn {
        height: 36px !important;
        padding: 0 12px !important;
    }
}

@media (max-width: 768px) {
    .cbt-problemTitle {
        font-size: 16px !important;
        line-height: 1.22 !important;
        gap: 10px !important;
    }

    .cbt-problemTitle .linux-exercise {
        width: 24px !important;
        height: 24px !important;
        flex: 0 0 24px !important;
    }

    .cbt-problemTitle svg {
        width: 20px !important;
        height: 20px !important;
    }

    #manage-container-btn.lab-status-reset-btn {
        margin-left: auto !important;
        height: 34px !important;
        padding: 0 10px !important;
    }
}

/* CBT compact title and reset sizing final override 2026-04-10h */
#manage-container-btn.lab-status-reset-btn,
.lab-status-summary #manage-container-btn.lab-status-reset-btn {
    width: fit-content !important;
    min-width: 0 !important;
    max-width: fit-content !important;
    flex: 0 0 auto !important;
    justify-content: center !important;
    gap: 5px !important;
    padding: 0 9px !important;
    white-space: nowrap !important;
}

#manage-container-btn.lab-status-reset-btn svg {
    width: 13px !important;
    height: 13px !important;
}

#manage-container-btn.lab-status-reset-btn .lab-status-label,
#manage-container-btn.lab-status-reset-btn .lab-status-value {
    font-size: 12px !important;
    line-height: 1 !important;
}

@media (min-width: 769px) {
    .cbt-problemTitle {
        gap: 8px !important;
        font-size: 16px !important;
        line-height: 1.2 !important;
    }

    .cbt-problemTitle .linux-exercise {
        width: 24px !important;
        height: 24px !important;
        flex: 0 0 24px !important;
        border-radius: 7px !important;
    }

    .cbt-problemTitle svg {
        width: 16px !important;
        height: 16px !important;
    }

    #manage-container-btn.lab-status-reset-btn {
        height: 32px !important;
        min-height: 32px !important;
        padding: 0 9px !important;
    }
}

/* CBT back button hover centering final override 2026-04-10i */
.cbt-problemTitle .linux-exercise {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
}

.cbt-problemTitle .linux-exercise > svg,
.cbt-problemTitle svg {
    display: block !important;
    padding-right: 0 !important;
    margin: 0 !important;
    overflow: visible !important;
}

@media (max-width: 768px) {
    .cbt-problemTitle {
        gap: 8px !important;
        font-size: 15px !important;
        line-height: 1.24 !important;
    }

    .cbt-problemTitle .linux-exercise {
        width: 22px !important;
        height: 22px !important;
        flex: 0 0 22px !important;
    }

    .cbt-problemTitle svg {
        width: 15px !important;
        height: 15px !important;
    }

    #manage-container-btn.lab-status-reset-btn {
        height: 31px !important;
        min-height: 31px !important;
        padding: 0 8px !important;
    }
}

/* grading badge normalization only */
.grading-panel-badge {
    border-radius: 999px;
    font-weight: 700;
}

.grading-panel-badge.pending { background: var(--lx-badge-neutral-bg, #f8fafc); color: var(--lx-badge-neutral-text, #475467); }
.grading-panel-badge.success { background: var(--lx-badge-ok-bg, #ecfdf3); color: var(--lx-badge-ok-text, #15803d); }
.grading-panel-badge.fail { background: var(--lx-badge-error-bg, #fef2f2); color: var(--lx-badge-error-text, #b42318); }
.grading-panel-badge.error { background: var(--lx-badge-warn-bg, #fff7ed); color: var(--lx-badge-warn-text, #c2410c); }

/* requirements checklist card */
.requirements-source-hidden {
    display: none !important;
}

.requirement-progress-card {
    margin-bottom: 12px;
    padding: 14px 14px 12px;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    background: #f8fafc;
}

.requirement-progress-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 8px;
}

.requirement-progress-title {
    font-size: 14px;
    font-weight: 700;
    color: #111827;
}

.requirement-progress-counter {
    font-size: 13px;
    font-weight: 700;
    color: #475467;
}

.requirement-progress-track {
    width: 100%;
    height: 8px;
    border-radius: 999px;
    background: #e5e7eb;
    overflow: hidden;
}

.requirement-progress-fill {
    display: block;
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: linear-gradient(90deg, #2563eb 0%, #4f46e5 100%);
    transition: width 0.25s ease;
}

.requirement-progress-fill.has-fail {
    background: linear-gradient(90deg, #dc2626 0%, #f97316 100%);
}

.requirement-progress-next {
    margin-top: 8px;
    font-size: 13px;
    color: #475467;
    line-height: 1.45;
}

.requirement-checklist-wrap {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.requirement-check-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    border: 1px solid #d6dbe6;
    border-radius: 12px;
    padding: 8px 10px;
    background: #f7f8fb;
}

.requirement-check-icon-wrap {
    height: calc(13px * 1.45);
    min-height: calc(13px * 1.45);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 16px;
}

.requirement-check-icon {
    width: 16px;
    height: 16px;
    min-width: 16px;
    min-height: 16px;
    box-sizing: border-box;
    aspect-ratio: 1 / 1;
    border-radius: 999px;
    border: 1.5px solid #98a2b3;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 9px;
    line-height: 1;
    color: #98a2b3;
    font-weight: 800;
    background: #ffffff;
    flex: 0 0 16px;
}

.requirement-check-content {
    min-width: 0;
    flex: 1 1 auto;
    text-align: left;
    display: block;
}

.requirement-check-index {
    display: none;
}

.requirement-check-label {
    margin: 0;
    font-size: 13px;
    line-height: 1.45;
    color: #344054;
    word-break: keep-all;
    text-align: left;
}

.requirement-check-item.is-pass .requirement-check-icon {
    border-color: #16a34a;
    color: #16a34a;
    background: #ecfdf3;
}

.requirement-check-item.is-fail .requirement-check-icon {
    border-color: #dc2626;
    color: #dc2626;
    background: #fef2f2;
}

.requirement-check-item.is-pending .requirement-check-icon {
    border-color: #98a2b3;
    color: transparent;
    background: #ffffff;
}

.requirement-checklist-empty {
    padding: 12px;
    border-radius: 10px;
    border: 1px dashed #d0d5dd;
    color: #667085;
    font-size: 13px;
}

.practice-card-unified .right-panel-body {
    margin-bottom: 0;
}

.right-panel-section-divider {
    height: 1px;
    background: #eaecf0;
    margin: 16px 0;
}

.requirement-panel-in-unified {
    margin-bottom: 0;
}

.problem-hint-reminder {
    margin-top: 12px;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid #bfdbfe;
    background: #eff6ff;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.problem-hint-reminder-title {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: calc(12px * 1.55);
    min-height: calc(12px * 1.55);
    flex: 0 0 16px;
    margin-bottom: 0;
    min-width: 16px;
}

.problem-hint-reminder-icon {
    width: 16px;
    height: 16px;
    min-width: 16px;
    min-height: 16px;
    box-sizing: border-box;
    aspect-ratio: 1 / 1;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    line-height: 1;
    color: #1d4ed8;
    background: #dbeafe;
    border: 1px solid #93c5fd;
    flex: 0 0 16px;
}

.problemDescription.problem-hint-reminder-text {
    margin: 0;
    font-size: 12px;
    line-height: 1.55;
    color: #1e3a8a;
    flex: 1 1 auto;
    min-width: 0;
    display: block;
}

/* submit button tone normalization */
#submitButton.submit-button-floating {
    background: #111827 !important;
    border-color: #111827 !important;
    color: #ffffff !important;
}

#submitButton.submit-button-floating:hover {
    background: #0b1220 !important;
    border-color: #0b1220 !important;
}

#submitButton.submit-button-floating.is-loading,
#submitButton.submit-button-floating:disabled {
    background: #475467 !important;
    border-color: #475467 !important;
    color: #e5e7eb !important;
}

/* unified right card height/overflow fix 2026-04-23 */
#right-panel {
    display: flex !important;
    flex-direction: column !important;
    min-height: 0 !important;
    height: 100% !important;
    overflow: hidden !important;
}

#right-panel-main {
    flex: 1 1 auto !important;
    min-height: 0 !important;
    height: auto !important;
    overflow: hidden !important;
    display: flex !important;
    flex-direction: column !important;
}

#problemCard.practice-card-unified {
    flex: 1 1 auto !important;
    min-height: 0 !important;
    height: 100% !important;
    margin-bottom: 0 !important;
    display: flex !important;
    flex-direction: column !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
}

#problemCard.practice-card-unified::-webkit-scrollbar {
    width: 10px;
}

#problemCard.practice-card-unified::-webkit-scrollbar-thumb {
    background: #d7dce5;
    border-radius: 999px;
    border: 2px solid #ffffff;
}

#problemCard.practice-card-unified .right-panel-body.static-body {
    max-height: none !important;
    overflow: visible !important;
}

/* unified problem/requirements section header: remove underline */
#problemCard.practice-card-unified .right-panel-section-title {
    border-bottom: 0 !important;
    padding-bottom: 0 !important;
}

/* inline grading result (no modal primary flow) */
.right-panel-submit-bar {
    display: flex !important;
    flex-direction: column !important;
    gap: 10px !important;
    margin-top: 12px !important;
    align-items: stretch !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.inline-result-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    padding: 10px 22px;
    background: #ffffff;
    width: 100%;
    max-width: 100%;
    align-self: stretch;
    box-sizing: border-box;
}

.inline-result-main {
    display: flex;
    align-items: center;
    min-width: 0;
    flex: 1 1 auto;
    text-align: left;
}

.inline-result-status {
    font-size: 13px;
    font-weight: 800;
    line-height: 1.35;
    text-align: left;
}

.inline-result-status.pending { color: #475467; }
.inline-result-status.success { color: #15803d; }
.inline-result-status.fail { color: #b42318; }
.inline-result-status.error { color: #c2410c; }

.inline-result-score {
    flex: 0 0 auto;
    font-size: 24px;
    line-height: 1;
    font-weight: 900;
    letter-spacing: -0.02em;
    color: #2563eb;
}

.inline-result-card.is-idle {
    border-color: #d0d5dd;
    background: #f8fafc;
}
.inline-result-card.is-idle .inline-result-status.pending { color: #475467; }
.inline-result-card.is-idle .inline-result-score { color: #667085; }

.inline-result-card.is-grading {
    border-color: #bfdbfe;
    background: #eff6ff;
}
.inline-result-card.is-grading .inline-result-status.pending { color: #1d4ed8; }
.inline-result-card.is-grading .inline-result-score { color: #2563eb; }

.inline-result-card.is-success {
    border-color: #86efac;
    background: #ecfdf3;
}
.inline-result-card.is-success .inline-result-status.success { color: #166534; }
.inline-result-card.is-success .inline-result-score { color: #15803d; }

.inline-result-card.is-fail {
    border-color: #fca5a5;
    background: #fef2f2;
}
.inline-result-card.is-fail .inline-result-status.fail { color: #991b1b; }
.inline-result-card.is-fail .inline-result-score { color: #b42318; }

.inline-result-card.is-error {
    border-color: #fed7aa;
    background: #fff7ed;
}
.inline-result-card.is-error .inline-result-score { color: #c2410c; }

#submitButton.submit-button-floating.is-next {
    background: #111827 !important;
    border-color: #111827 !important;
    color: #ffffff !important;
}

#submitButton.submit-button-floating.is-signup {
    display: inline-flex !important;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    min-width: 300px;
    padding: 0 14px;
}

#submitButton.submit-button-floating.is-signup .submit-button-main-label {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#submitButton.submit-button-floating.is-signup .submit-button-countdown {
    flex: 0 0 auto;
    min-width: 44px;
    text-align: right;
    font-weight: 900;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.01em;
}

#submitButton.submit-button-floating.is-signup:not(.has-countdown) .submit-button-countdown {
    display: none;
}

#submitButton.submit-button-floating.is-morphing-next {
    animation: submitButtonMorphToNext 0.42s cubic-bezier(0.22, 1, 0.36, 1);
}

.fixed-submit-actions {
    width: 100% !important;
    max-width: 100% !important;
    align-self: stretch !important;
    box-sizing: border-box !important;
}

@media (max-width: 1280px) {
    .inline-result-card {
        padding-left: 16px;
        padding-right: 16px;
    }
}

@keyframes submitButtonMorphToNext {
    0% {
        transform: scale(1);
        filter: brightness(1);
    }
    50% {
        transform: scale(1.02);
        filter: brightness(1.06);
    }
    100% {
        transform: scale(1);
        filter: brightness(1);
    }
}

/* right-panel gutter sync fix 2026-04-23u */
@media (min-width: 769px) {
    #right-panel-main {
        padding: 0 !important;
    }

    .right-panel-submit-bar {
        padding: 0 !important;
        box-sizing: border-box !important;
    }

    .right-panel-submit-bar #inlineResultCard,
    .right-panel-submit-bar .fixed-submit-actions {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
    }
}

@media (max-width: 768px) {
    #right-panel,
    .right-panel {
        height: auto !important;
        min-height: 0 !important;
        overflow: visible !important;
    }

    #right-panel-main {
        flex: 0 0 auto !important;
        height: auto !important;
        min-height: 0 !important;
        overflow: visible !important;
        padding: 0 0 calc(176px + env(safe-area-inset-bottom)) 0 !important;
        box-sizing: border-box !important;
    }

    #problemPanel {
        height: auto !important;
        max-height: none !important;
        overflow-y: visible !important;
        overflow-x: hidden !important;
        padding-right: 0 !important;
        box-sizing: border-box !important;
    }

    .right-panel-submit-bar {
        margin-top: 12px !important;
        padding: 8px 12px 0 !important;
        box-sizing: border-box !important;
    }

    .right-panel-submit-bar #inlineResultCard,
    .right-panel-submit-bar .fixed-submit-actions {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
    }

    #problemCard.practice-card-unified {
        flex: 0 0 auto !important;
        height: auto !important;
        min-height: 0 !important;
        overflow: visible !important;
        margin-bottom: 0 !important;
    }

    #problemCard.practice-card-unified #problemPanel.right-panel-body.static-body,
    #problemCard.practice-card-unified #requirementsPanel.right-panel-body.static-body {
        flex: 0 0 auto !important;
        min-height: 0 !important;
        height: auto !important;
        max-height: none !important;
        overflow: visible !important;
    }
}