/* Frostbit Adaptive Testing — Stylesheet */

:root {
    --bg: #f0f2f5;
    --bg-card: #fff;
    --text: #1a1a1a;
    --text-muted: #6b7280;
    --text-faint: #9ca3af;
    --border: #e5e7eb;
    --border-hover: #2563eb;
    --accent: #2563eb;
    --accent-dark: #1d4ed8;
    --input-bg: #fff;
    --input-border: #d1d5db;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
    --correct-bg: #f0fdf4;
    --incorrect-bg: #fef2f2;
    --correct-border: #16a34a;
    --incorrect-border: #dc2626;
    --tag-easy-bg: #dcfce7; --tag-easy-text: #166534;
    --tag-med-bg: #fef9c3; --tag-med-text: #854d0e;
    --tag-hard-bg: #fee2e2; --tag-hard-text: #991b1b;
}

/* Dark mode override class */
[data-theme="dark"] {
        --bg: #111827;
        --bg-card: #1f2937;
        --text: #f3f4f6;
        --text-muted: #9ca3af;
        --text-faint: #6b7280;
        --border: #374151;
        --border-hover: #60a5fa;
        --accent: #60a5fa;
        --accent-dark: #3b82f6;
        --input-bg: #374151;
        --input-border: #4b5563;
        --card-shadow: 0 1px 3px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.2);
        --correct-bg: #064e3b;
        --incorrect-bg: #7f1d1d;
        --correct-border: #34d399;
        --incorrect-border: #f87171;
        --tag-easy-bg: #064e3b; --tag-easy-text: #6ee7b7;
        --tag-med-bg: #78350f; --tag-med-text: #fcd34d;
        --tag-hard-bg: #7f1d1d; --tag-hard-text: #fca5a5;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #111827;
        --bg-card: #1f2937;
        --text: #f3f4f6;
        --text-muted: #9ca3af;
        --text-faint: #6b7280;
        --border: #374151;
        --border-hover: #60a5fa;
        --accent: #60a5fa;
        --accent-dark: #3b82f6;
        --input-bg: #374151;
        --input-border: #4b5563;
        --card-shadow: 0 1px 3px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.2);
        --correct-bg: #064e3b;
        --incorrect-bg: #7f1d1d;
        --correct-border: #34d399;
        --incorrect-border: #f87171;
        --tag-easy-bg: #064e3b; --tag-easy-text: #6ee7b7;
        --tag-med-bg: #78350f; --tag-med-text: #fcd34d;
        --tag-hard-bg: #7f1d1d; --tag-hard-text: #fca5a5;
    }
}

/* Toggle switch */
.toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.9rem;
    padding-left: 52px;
    min-height: 22px;
}

.toggle input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    left: 0;
}

.toggle-track {
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 22px;
    background: var(--border);
    border-radius: 11px;
    transition: background 0.2s;
}

.toggle input:checked + .toggle-track {
    background: var(--accent);
}

.toggle-knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.2s;
    pointer-events: none;
}

.toggle input:checked + .toggle-track > .toggle-knob {
    transform: translateX(18px);
}

.toggle-sm {
    padding-left: 36px;
    min-height: 18px;
}

.toggle-sm .toggle-track {
    width: 32px;
    height: 18px;
    border-radius: 9px;
}

.toggle-sm .toggle-knob {
    width: 12px;
    height: 12px;
    top: 3px;
    left: 3px;
}

.toggle-sm input:checked + .toggle-track > .toggle-knob {
    transform: translateX(14px);
}

.btn-delete {
    color: var(--text-faint);
    font-weight: 700;
}

.btn-delete:hover {
    color: var(--incorrect-border);
    border-color: var(--incorrect-border);
}

/* Theme toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.3rem 0.6rem;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text);
    line-height: 1;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 760px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
}

.start-card {
    text-align: center;
    margin-top: 4rem;
}

.start-card h1 {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 0.25rem;
}

.start-card h2 {
    font-size: 1.1rem;
    font-weight: 500;
    color: #666;
    margin-bottom: 1.5rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 500px;
    margin: 0 auto 2rem;
}

/* Forms */
.start-form {
    max-width: 320px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1rem;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.3rem;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border: 1.5px solid var(--input-border);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--text);
    transition: border-color 0.15s;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

.divider {
    display: flex;
    align-items: center;
    margin: 1.5rem auto;
    max-width: 320px;
    gap: 1rem;
    color: var(--text-faint);
    font-size: 0.85rem;
}

.divider::before, .divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--border);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.7rem 1.8rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-dark);
}

.btn-secondary {
    background: var(--border);
    color: var(--text);
}

.btn-secondary:hover {
    opacity: 0.85;
}

/* Exam header */
.exam-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding: 0 0.5rem;
}

.student-name {
    font-weight: 600;
    color: var(--text);
}

.progress {
    font-size: 0.9rem;
    color: #6b7280;
    font-weight: 500;
}

/* Question */
.question-text {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    color: var(--text);
}

/* Choices */
.choices {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.choice-btn {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1.5px solid var(--input-border);
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text);
    font-size: 0.95rem;
    text-align: left;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    line-height: 1.5;
}

.choice-btn:hover:not(:disabled) {
    border-color: var(--accent);
    background: var(--bg);
}

.choice-btn:disabled {
    cursor: default;
}

.choice-skip {
    justify-content: space-between;
    border-style: dashed;
    color: var(--text-faint);
    font-size: 0.85rem;
}

.choice-skip:hover:not(:disabled) {
    border-color: var(--text-muted);
    background: var(--bg);
}

.choice-skip:disabled {
    opacity: 0.4;
}

.choice-btn.correct {
    border-color: var(--correct-border);
    background: var(--correct-bg);
}

.choice-btn.incorrect {
    border-color: var(--incorrect-border);
    background: var(--incorrect-bg);
}

.choice-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.6rem;
    height: 1.6rem;
    border-radius: 50%;
    background: var(--border);
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--text);
    flex-shrink: 0;
}

/* Feedback */
.feedback {
    min-height: 1.5rem;
    padding: 0.5rem 0;
    font-weight: 600;
    font-size: 0.95rem;
}

.feedback-correct {
    color: #16a34a;
}

.feedback-incorrect {
    color: #dc2626;
}


/* Skill chart */
.skill-chart-card {
    margin-top: 1.5rem;
    padding: 1rem 1.5rem;
}

.skill-chart-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
}

.challenge-chart-title, .skill-chart-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.skill-chart-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: #2563eb;
}

.chart-toggle {
    background: none;
    border: none;
    color: var(--text-faint);
    cursor: pointer;
    font-size: 0.75rem;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
}

.chart-toggle:hover {
    color: var(--text);
    background: var(--border);
}

#skill-chart {
    width: 100%;
    height: 180px;
}

/* Loading */
.loading {
    text-align: center;
    padding: 3rem;
    color: #6b7280;
}

/* Results */
.results-card h1 {
    text-align: center;
    color: #1e40af;
    margin-bottom: 0.25rem;
}

.student-name-result {
    text-align: center;
    color: #666;
    margin-bottom: 2rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.result-stat {
    text-align: center;
    padding: 1rem;
    background: #f9fafb;
    border-radius: 8px;
}

.stat-value {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    color: #1e40af;
}

.stat-label {
    font-size: 0.8rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Tier breakdown */
.tier-breakdown {
    margin: 1rem 0 2rem;
}

.tier-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.6rem;
}

.tier-name {
    width: 70px;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: capitalize;
}

.tier-bar-bg {
    flex: 1;
    height: 12px;
    background: #e5e7eb;
    border-radius: 6px;
    overflow: hidden;
}

.tier-bar {
    height: 100%;
    background: #2563eb;
    border-radius: 6px;
    transition: width 0.5s;
}

.tier-pct {
    width: 100px;
    text-align: right;
    font-size: 0.85rem;
    color: #666;
}

/* Chart */
.chart-container {
    background: #fafafa;
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
}

/* Admin */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.admin-table th, .admin-table td {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.admin-table th {
    background: var(--bg);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-muted);
}

.admin-table a {
    color: var(--accent);
    text-decoration: none;
}

.admin-table a:hover {
    text-decoration: underline;
}

.row-correct {
    background: var(--correct-bg);
}

.row-incorrect {
    background: var(--incorrect-bg);
}

.question-cell {
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Side-by-side exam layout */
.exam-body {
    overflow: hidden;
}

.exam-layout {
    display: flex;
    height: 100vh;
    gap: 0;
}

.resize-handle {
    width: 6px;
    cursor: col-resize;
    background: var(--border);
    transition: background 0.15s;
    flex-shrink: 0;
}

.resize-handle:hover {
    background: var(--accent);
}

.pdf-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #f9fafb;
    min-width: 0;
}

.pdf-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 1rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
}

.pdf-page-label {
    font-weight: 400;
    color: #6b7280;
    font-size: 0.8rem;
}

.pdf-panel embed,
.pdf-panel iframe {
    flex: 1;
    width: 100%;
    border: none;
}

.question-panel {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

.btn-finish {
    background: none;
    border: 1.5px solid #d1d5db;
    color: #6b7280;
    padding: 0.4rem 1.2rem;
    font-size: 0.85rem;
    border-radius: 6px;
    cursor: pointer;
}

.btn-finish:hover {
    border-color: #9ca3af;
    color: #374151;
}

.keyboard-hint {
    text-align: center;
    font-size: 0.75rem;
    color: #9ca3af;
}

.keyboard-hint kbd {
    display: inline-block;
    padding: 0.1rem 0.4rem;
    background: #f3f4f6;
    border: 1px solid #d1d5db;
    border-radius: 3px;
    font-family: inherit;
    font-size: 0.7rem;
}

/* Admin layout */
.admin-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.admin-header h1 {
    font-size: 1.4rem;
    color: #1e40af;
    min-width: 0;
    overflow-wrap: break-word;
}

.header-sub {
    font-weight: 400;
    color: #6b7280;
    font-size: 1rem;
}

.admin-nav {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
    flex-wrap: nowrap;
    align-items: center;
}

.nav-link {
    padding: 0.4rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    color: #374151;
    background: #f3f4f6;
}

.nav-link:hover { background: #e5e7eb; }
.nav-link.active { background: var(--accent); color: #fff; }

.nav-btn {
    background: none;
    border: none;
    cursor: pointer;
    font: inherit;
    padding: 0.4rem 1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
}

.nav-btn:hover {
    background: #e5e7eb;
}

.admin-nav form {
    display: inline-flex;
    margin: 0;
}

.error-msg {
    background: #fee2e2;
    color: #991b1b;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Stats row */
.stats-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.stat-card {
    flex: 1;
    min-width: 120px;
    background: var(--bg-card);
    border-radius: 10px;
    padding: 1rem;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.stat-number {
    font-size: 1.6rem;
    font-weight: 700;
    color: #1e40af;
}

.stat-desc {
    font-size: 0.75rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-top: 0.2rem;
}

/* Charts row */
.charts-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 1100px) {
    .charts-row {
        grid-template-columns: 1fr;
    }
}

.chart-card { padding: 1.25rem; overflow: hidden; }
.chart-card .bar-chart { max-width: 100%; }
.chart-card h3 { font-size: 0.9rem; color: #374151; margin-bottom: 0.75rem; }

.bar-chart { display: flex; flex-direction: column; gap: 0.4rem; }
.bar-row { display: grid; grid-template-columns: 70px 1fr 30px 50px 12px; align-items: center; gap: 0.4rem; }
.bar-label { font-size: 0.75rem; font-weight: 500; color: var(--text); text-transform: capitalize; }
.bar-bg { height: 14px; background: var(--border); border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 4px; transition: width 0.3s; }
.bar-value { text-align: right; font-size: 0.75rem; color: var(--text-muted); }

.weight-slider {
    width: 100%;
    accent-color: var(--accent);
}

.weight-val {
    font-size: 0.7rem;
    color: var(--text-faint);
    text-align: center;
}

/* Rows without sliders (e.g. sessions page) */
.bar-row:not(:has(.weight-slider)) { grid-template-columns: 70px 1fr 30px; }
.bar-easy { background: #4ade80; }
.bar-medium { background: #fbbf24; }
.bar-hard { background: #f87171; }
.bar-blooms { background: #818cf8; }

/* Tier tags */
.tier-tag {
    display: inline-block;
    padding: 0.1rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
}
.tier-easy { background: #dcfce7; color: #166534; }
.tier-medium { background: #fef9c3; color: #854d0e; }
.tier-hard { background: #fee2e2; color: #991b1b; }

/* Status badges */
.status-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}
.status-done { background: #dcfce7; color: #166534; }
.status-active { background: #dbeafe; color: #1e40af; }

/* Flag tags */
.flag-tag {
    display: inline-block;
    padding: 0.1rem 0.4rem;
    border-radius: 3px;
    font-size: 0.7rem;
    background: #fef3c7;
    color: #92400e;
    margin: 1px;
}

/* Filters */
.filter-card { padding: 0.75rem 1.25rem; }
.filter-row {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}
.filter-row label {
    font-size: 0.85rem;
    font-weight: 500;
    color: #374151;
}
.filter-row select {
    margin-left: 0.3rem;
    padding: 0.3rem 0.5rem;
    border: 1px solid #d1d5db;
    border-radius: 5px;
    font-size: 0.85rem;
}
.filter-count {
    font-size: 0.8rem;
    color: #6b7280;
    margin-left: auto;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.table-header h3 { margin: 0; }

.btn-sm {
    padding: 0.3rem 0.8rem;
    font-size: 0.8rem;
}

.btn-icon {
    background: none;
    border: 1px solid #d1d5db;
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    font-size: 0.7rem;
    color: #6b7280;
    cursor: pointer;
}

.btn-icon:hover {
    background: #f3f4f6;
    color: #374151;
}

#theta-chart {
    width: 100%;
    max-width: 100%;
    height: 200px;
}

.compare-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid #f0f0f0;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: #374151;
}

.legend-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

/* Sortable headers */
.admin-table th {
    cursor: pointer;
    user-select: none;
}
.admin-table th:hover {
    background: #eef2ff;
}

/* Inline question editor */
.q-editor {
    padding: 1rem;
    background: var(--bg);
    border-radius: 8px;
    margin: 0.25rem 0;
}

.q-editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.q-editor-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: 1rem;
}

.q-editor textarea,
.q-editor input[type="text"] {
    width: 100%;
    padding: 0.5rem 0.7rem;
    border: 1.5px solid var(--input-border);
    border-radius: 6px;
    font-size: 0.9rem;
    background: var(--input-bg);
    color: var(--text);
    font-family: inherit;
}

.q-editor textarea:focus,
.q-editor input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
}

.q-choices-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.q-editor-row td {
    padding: 0 !important;
    border-bottom: none !important;
}

.q-row { cursor: pointer; }
.q-row:hover td { background: var(--bg); }

/* Build form */
.form-row-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.file-upload {
    position: relative;
    border: 2px dashed var(--border);
    border-radius: 10px;
    padding: 2rem;
    text-align: center;
    transition: border-color 0.2s;
    cursor: pointer;
}

.file-upload:hover {
    border-color: var(--accent);
}

.file-upload input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.file-upload-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: var(--border);
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--text-muted);
}

input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
}

.slider-range {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-faint);
    margin-top: -0.2rem;
}

.pdf-info {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.build-estimate {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.estimate-card {
    flex: 1;
    text-align: center;
    padding: 0.5rem;
    background: var(--bg);
    border-radius: 6px;
}

.estimate-number {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
}

.estimate-label {
    font-size: 0.7rem;
    color: var(--text-faint);
}

/* Build status steps */
.build-steps {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0;
}

.build-step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 0.75rem 0;
    position: relative;
}

.build-step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 9px;
    top: 2.2rem;
    bottom: -0.75rem;
    width: 2px;
    background: var(--border);
}

.step-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--border);
    flex-shrink: 0;
    margin-top: 2px;
}

.step-done .step-dot {
    background: #16a34a;
}

.step-active .step-dot {
    background: var(--accent);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.2);
}

.step-done::after {
    background: #16a34a !important;
}

.step-info strong {
    display: block;
    font-size: 0.9rem;
}

.step-info span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.build-log {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1rem;
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    max-height: 300px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Exam list */
.exam-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 1.5rem auto;
    max-width: 500px;
}

.exam-card-link {
    text-decoration: none;
    color: inherit;
}

.exam-card-item {
    padding: 1.25rem;
    border: 1.5px solid #e5e7eb;
    border-radius: 10px;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.exam-card-item:hover {
    border-color: #2563eb;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
}

.exam-card-item h3 {
    font-size: 1.05rem;
    color: #1e40af;
    margin-bottom: 0.2rem;
}

.exam-card-item p {
    font-size: 0.85rem;
    color: #6b7280;
    margin-bottom: 0.3rem;
}

.exam-item-count {
    font-size: 0.75rem;
    color: #9ca3af;
}

/* Build form */
.build-form {
    max-width: 500px;
}

.build-form .form-group {
    margin-bottom: 1.25rem;
}

.build-form textarea {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border: 1.5px solid #d1d5db;
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
}

.build-form textarea:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.form-hint {
    display: block;
    font-size: 0.75rem;
    color: #9ca3af;
    margin-top: 0.2rem;
}

.success-msg {
    background: #dcfce7;
    color: #166534;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 900px) {
    .exam-body {
        overflow: auto;
    }
    .exam-layout {
        display: block;
        height: auto;
        min-height: 100vh;
    }
    .resize-handle {
        display: none;
    }
    .pdf-panel {
        height: min(65vh, 560px);
        min-height: 360px;
        border-bottom: 1px solid #e5e7eb;
    }
    .pdf-panel iframe,
    .pdf-panel embed {
        min-height: 0;
        height: 100%;
    }
    .question-panel {
        max-width: 100%;
        min-width: 0;
        overflow: visible;
        padding: 1rem;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 1rem 0.5rem;
    }
    .card {
        padding: 1.25rem;
    }
    .results-grid {
        grid-template-columns: 1fr;
    }
    .start-card {
        margin-top: 1rem;
    }
}