:root {
    --ink: #1a1614;
    --ink-soft: #4a4540;
    --ink-faint: #8a847d;
    --paper: #f6f1e8;
    --paper-warm: #efe8db;
    --paper-deep: #e8dfce;
    --rule: #c9bfa9;
    --rule-soft: #d9d0bb;
    --accent: #8b3a1f;
    --accent-soft: #b85d3a;
    --correct: #2d5016;
    --correct-bg: #d8e2c4;
    --wrong: #7a1f1f;
    --wrong-bg: #ead7d3;
    --warn: #6b4a0a;
    --warn-bg: #f0e3c0;
    --display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
  }

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

  html, body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--body);
    font-size: 16px;
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  body {
    background-image:
      radial-gradient(circle at 20% 30%, rgba(201, 191, 169, 0.15) 0%, transparent 50%),
      radial-gradient(circle at 80% 70%, rgba(184, 93, 58, 0.05) 0%, transparent 50%);
    background-attachment: fixed;
  }

  .container {
    max-width: 820px;
    margin: 0 auto;
    padding: 3rem 1.5rem 6rem;
  }

  .stage { display: none; }
  .stage.active { display: block; animation: fadeIn 0.4s ease-out; }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
  }

  /* ============ LANGUAGE TOGGLE ============ */
  .lang-toggle {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    z-index: 50;
    display: flex;
    background: var(--paper);
    border: 1px solid var(--ink);
    overflow: hidden;
    box-shadow: 2px 2px 0 var(--ink);
  }
  .lang-btn {
    font-family: var(--display);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.15em;
    padding: 8px 14px;
    background: var(--paper);
    color: var(--ink);
    border: none;
    cursor: pointer;
    transition: all 0.15s ease;
  }
  .lang-btn.active {
    background: var(--ink);
    color: var(--paper);
  }
  .lang-btn:not(.active):hover {
    background: var(--paper-warm);
  }
  .lang-toggle.hidden {
    display: none;
  }

  .ornament {
    text-align: center;
    color: var(--rule);
    font-size: 18px;
    margin: 2rem 0;
    letter-spacing: 1em;
  }

  /* ============ COVER PAGE ============ */
  .cover-eyebrow {
    font-family: var(--display);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.25em;
    color: var(--ink-faint);
    margin-bottom: 1.5rem;
    font-weight: 500;
  }

  .cover-title {
    font-family: var(--display);
    font-size: clamp(40px, 6vw, 64px);
    line-height: 1.05;
    font-weight: 600;
    letter-spacing: -0.025em;
    margin-bottom: 1rem;
  }

  .cover-title .accent {
    color: var(--accent);
    font-weight: 500;
  }

  .cover-subtitle {
    font-family: var(--body);
    font-size: 18px;
    color: var(--ink-soft);
    font-weight: 400;
    margin-bottom: 3rem;
    max-width: 600px;
    line-height: 1.55;
  }

  .meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1px;
    background: var(--rule);
    border: 1px solid var(--rule);
    margin: 2.5rem 0;
  }
  .meta-cell {
    background: var(--paper);
    padding: 1.25rem 1rem;
  }
  .meta-label {
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--ink-faint);
    margin-bottom: 6px;
    font-weight: 500;
  }
  .meta-value {
    font-family: var(--display);
    font-size: 26px;
    font-weight: 600;
    letter-spacing: -0.02em;
  }
  .meta-value small {
    font-family: var(--body);
    font-size: 12px;
    color: var(--ink-faint);
    font-weight: 400;
    letter-spacing: 0;
  }

  .domain-list {
    margin: 2.5rem 0;
  }
  .domain-row {
    display: grid;
    grid-template-columns: 50px 1fr 80px;
    gap: 1rem;
    align-items: baseline;
    padding: 1rem 0;
    border-bottom: 1px dotted var(--rule);
  }
  .domain-row:first-child { border-top: 1px dotted var(--rule); }
  .domain-num {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--ink-faint);
    letter-spacing: 0.05em;
  }
  .domain-name {
    font-family: var(--body);
    font-size: 16px;
    font-weight: 500;
  }
  .domain-pct {
    font-family: var(--mono);
    font-size: 14px;
    color: var(--ink-soft);
    text-align: right;
    font-weight: 500;
  }

  .section-heading {
    font-family: var(--display);
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: -0.015em;
  }

  .instructions {
    background: var(--paper-warm);
    border-left: 3px solid var(--accent);
    padding: 1.5rem 1.75rem;
    margin: 2.5rem 0;
    font-size: 15px;
    line-height: 1.7;
  }
  .instructions h3 {
    font-family: var(--display);
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }
  .instructions ul {
    list-style: none;
    padding-left: 0;
  }
  .instructions li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.5rem;
  }
  .instructions li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 600;
  }

  /* ============ BUTTONS ============ */
  .btn {
    font-family: var(--display);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.12em;
    padding: 14px 28px;
    border: 1px solid var(--ink);
    background: var(--ink);
    color: var(--paper);
    cursor: pointer;
    transition: all 0.15s ease;
    text-transform: uppercase;
  }
  .btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    transform: translateY(-1px);
  }
  .btn:disabled {
    background: var(--rule);
    border-color: var(--rule);
    cursor: not-allowed;
    transform: none;
  }
  .btn-ghost {
    background: transparent;
    color: var(--ink);
  }
  .btn-ghost:hover {
    background: var(--ink);
    color: var(--paper);
  }

  /* ============ EXAM STAGE ============ */
  .exam-intro {
    margin-bottom: 2rem;
  }
  .exam-meta-left {
    font-family: var(--display);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--ink-faint);
    font-weight: 500;
  }

  .question-shell {
    border: 1px solid var(--rule);
    background: linear-gradient(180deg, rgba(239, 232, 219, 0.55) 0%, rgba(246, 241, 232, 0.98) 22%);
    padding: 1.5rem 1.5rem 1.75rem;
    box-shadow: 0 18px 36px rgba(139, 58, 31, 0.06);
  }
  .question-shell-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px dotted var(--rule);
  }
  .question-position {
    font-family: var(--display);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--ink-faint);
    font-weight: 600;
    margin-bottom: 0.45rem;
  }
  .question-status {
    font-family: var(--body);
    font-size: 14px;
    color: var(--ink-soft);
  }
  .question-stepper {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
    max-width: 240px;
  }
  .step-dot {
    width: 12px;
    height: 12px;
    border: 1px solid var(--rule);
    background: transparent;
    transition: all 0.15s ease;
  }
  .step-dot.answered {
    background: var(--accent-soft);
    border-color: var(--accent-soft);
  }
  .step-dot.current {
    border-color: var(--ink);
    box-shadow: 0 0 0 2px rgba(26, 22, 20, 0.12);
  }
  .step-dot.current.answered {
    background: var(--accent);
    border-color: var(--accent);
  }

  .question-block {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
  }

  .q-tags {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
  }
  .q-num {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--ink-faint);
    font-weight: 500;
  }
  .q-domain {
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    padding: 4px 10px;
    border: 1px solid var(--rule);
    color: var(--ink-soft);
    font-weight: 600;
  }
  .q-scenario {
    font-family: var(--body);
    font-size: 13px;
    color: var(--ink-faint);
    font-weight: 400;
  }

  .q-text {
    font-family: var(--display);
    font-size: 19px;
    line-height: 1.5;
    margin-bottom: 1.75rem;
    font-weight: 500;
    color: var(--ink);
    letter-spacing: -0.01em;
  }

  .options {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .option {
    display: grid;
    grid-template-columns: 36px 1fr;
    gap: 14px;
    align-items: flex-start;
    padding: 16px 18px;
    border: 1px solid var(--rule);
    background: var(--paper);
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: left;
    font-family: var(--body);
    font-size: 15px;
    line-height: 1.55;
    color: var(--ink);
    width: 100%;
    font-weight: 400;
  }
  .option:hover {
    background: var(--paper-warm);
    border-color: var(--ink-faint);
  }
  .option.selected {
    background: var(--paper-deep);
    border-color: var(--accent);
    border-width: 1px;
    box-shadow: inset 3px 0 0 var(--accent);
  }
  .option-letter {
    font-family: var(--display);
    font-size: 16px;
    color: var(--ink-faint);
    font-weight: 600;
    line-height: 1.5;
  }
  .option.selected .option-letter {
    color: var(--accent);
  }

  .question-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.25rem;
    border-top: 1px dotted var(--rule);
  }
  .question-nav-meta {
    flex: 1;
    text-align: center;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--ink-faint);
    text-transform: uppercase;
    letter-spacing: 0.1em;
  }
  .nav-btn {
    min-width: 144px;
  }

  .submit-bar {
    position: sticky;
    bottom: 0;
    background: var(--paper);
    background-image: linear-gradient(to top, var(--paper) 70%, transparent);
    padding: 1.5rem 0 1rem;
    margin-top: 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    border-top: 1px solid var(--rule-soft);
  }
  .submit-bar-left,
  .submit-bar-right {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
  }
  .submit-bar-left {
    flex: 1;
  }
  .exam-timer {
    display: inline-flex;
    flex-direction: column;
    gap: 2px;
    padding: 0.75rem 0.9rem;
    border: 1px solid var(--rule);
    background: var(--paper-warm);
    min-width: 120px;
  }
  .exam-timer-label {
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--ink-faint);
    font-weight: 600;
  }
  .exam-timer-value {
    font-family: var(--mono);
    font-size: 22px;
    line-height: 1;
    color: var(--ink);
    font-weight: 500;
  }
  .progress-pill {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    padding: 0.6rem 0.9rem;
    border: 1px solid var(--rule);
    background: var(--paper);
  }
  .progress-ring {
    --progress: 0%;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background:
      radial-gradient(circle at center, var(--paper) 60%, transparent 61%),
      conic-gradient(var(--accent) var(--progress), var(--rule-soft) 0);
    display: grid;
    place-items: center;
    flex-shrink: 0;
  }
  .progress-ring-value {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--accent);
    font-weight: 600;
  }
  .progress-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }
  .progress-counter {
    font-family: var(--mono);
    font-size: 14px;
    color: var(--ink);
    font-weight: 600;
  }
  .progress-label {
    font-family: var(--body);
    font-size: 13px;
    color: var(--ink-soft);
  }

  /* ============ RESULT STAGE ============ */
  .verdict {
    text-align: center;
    padding: 3rem 1rem 2rem;
    margin-bottom: 2rem;
  }
  .verdict-status {
    font-family: var(--display);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.3em;
    margin-bottom: 1rem;
    font-weight: 700;
  }
  .verdict-status.passed { color: var(--correct); }
  .verdict-status.failed { color: var(--wrong); }
  .verdict-score {
    font-family: var(--display);
    font-size: clamp(72px, 12vw, 120px);
    line-height: 1;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.04em;
  }
  .verdict-score .accent {
    color: var(--accent);
    font-weight: 400;
  }
  .verdict-scale {
    font-family: var(--body);
    font-size: 16px;
    color: var(--ink-soft);
  }

  .stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1px;
    background: var(--rule);
    border: 1px solid var(--rule);
    margin: 2rem 0;
  }
  .stat-cell {
    background: var(--paper);
    padding: 1.25rem 1rem;
    text-align: center;
  }
  .stat-num {
    font-family: var(--display);
    font-size: 32px;
    font-weight: 600;
    line-height: 1;
    margin-bottom: 4px;
    letter-spacing: -0.02em;
  }
  .stat-num.good { color: var(--correct); }
  .stat-num.bad { color: var(--wrong); }
  .stat-label {
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--ink-faint);
    font-weight: 600;
  }
  .result-timer {
    text-align: center;
    font-family: var(--mono);
    font-size: 14px;
    color: var(--ink-soft);
    margin-top: -0.5rem;
    margin-bottom: 2rem;
  }
  .result-timer strong {
    color: var(--ink);
    font-weight: 600;
  }

  .result-overview {
    margin: 0 0 2rem;
  }
  .result-overview-card {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 1.25rem;
    padding: 1.5rem;
    border: 1px solid var(--rule);
    background:
      linear-gradient(135deg, rgba(239, 232, 219, 0.95) 0%, rgba(246, 241, 232, 0.95) 55%),
      var(--paper);
    box-shadow: 0 14px 30px rgba(139, 58, 31, 0.06);
  }
  .result-overview-copy {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
  }
  .result-overview-kicker {
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--accent);
    font-weight: 700;
  }
  .result-overview-title {
    font-family: var(--display);
    font-size: 24px;
    line-height: 1.15;
    letter-spacing: -0.02em;
    font-weight: 600;
  }
  .result-overview-text {
    font-size: 15px;
    line-height: 1.7;
    color: var(--ink-soft);
    max-width: 48ch;
  }
  .result-overview-meta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
  .result-meta-chip {
    border: 1px solid var(--rule);
    background: rgba(246, 241, 232, 0.88);
    padding: 0.95rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    min-height: 86px;
    justify-content: center;
  }
  .result-meta-label {
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--ink-faint);
    font-weight: 600;
  }
  .result-meta-chip strong {
    font-family: var(--display);
    font-size: 16px;
    line-height: 1.35;
    font-weight: 600;
    color: var(--ink);
  }

  .domain-breakdown { margin: 2.5rem 0; }
  .breakdown-row { margin-bottom: 1.25rem; }
  .breakdown-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 6px;
  }
  .breakdown-name {
    font-family: var(--body);
    font-size: 15px;
    font-weight: 500;
  }
  .breakdown-stat {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--ink-soft);
  }
  .breakdown-bar {
    height: 4px;
    background: var(--rule-soft);
    position: relative;
    overflow: hidden;
  }
  .breakdown-fill {
    position: absolute;
    inset: 0 auto 0 0;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .result-history-section {
    margin-top: 3rem;
  }
  .result-history-subtitle {
    color: var(--ink-soft);
    font-size: 15px;
    margin-top: -0.75rem;
    margin-bottom: 1.5rem;
  }
  .result-history-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
  }
  .result-history-empty {
    text-align: center;
    color: var(--ink-faint);
    padding: 2rem 1rem;
    border: 1px dashed var(--rule);
    background: rgba(239, 232, 219, 0.5);
  }
  .history-item {
    border: 1px solid var(--rule);
    background: var(--paper);
    overflow: hidden;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
  }
  .history-item.passed {
    border-left: 4px solid var(--correct);
  }
  .history-item.failed {
    border-left: 4px solid var(--wrong);
  }
  .history-item.latest {
    box-shadow: 0 16px 32px rgba(139, 58, 31, 0.08);
  }
  .history-summary {
    width: 100%;
    border: 0;
    background: transparent;
    color: inherit;
    text-align: left;
    padding: 1.2rem 1.25rem;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    cursor: pointer;
  }
  .history-summary:hover {
    background: var(--paper-warm);
  }
  .history-summary-main {
    min-width: 0;
  }
  .history-summary-topline {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
  }
  .history-attempt-name {
    font-family: var(--display);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--ink-faint);
    font-weight: 700;
  }
  .history-badge {
    font-family: var(--display);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    padding: 4px 8px;
    background: var(--accent);
    color: var(--paper);
    font-weight: 700;
  }
  .history-summary-score {
    font-family: var(--display);
    font-size: clamp(32px, 5vw, 42px);
    line-height: 1;
    letter-spacing: -0.03em;
    font-weight: 600;
    margin-bottom: 0.35rem;
  }
  .history-summary-score span {
    color: var(--ink-faint);
    font-size: 0.45em;
    letter-spacing: 0;
    margin-left: 0.3rem;
  }
  .history-summary-meta {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--ink-faint);
  }
  .history-summary-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(110px, 1fr));
    gap: 8px;
    min-width: 240px;
  }
  .history-mini-stat {
    border: 1px solid var(--rule);
    background: rgba(246, 241, 232, 0.88);
    padding: 0.75rem 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
  }
  .history-mini-stat span {
    font-family: var(--display);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--ink-faint);
    font-weight: 700;
  }
  .history-mini-stat strong {
    font-family: var(--display);
    font-size: 17px;
    font-weight: 600;
    color: var(--ink);
  }
  .history-summary-cta {
    grid-column: 1 / -1;
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    border: 1px dashed var(--rule);
    background: rgba(239, 232, 219, 0.42);
    padding: 0.7rem 0.85rem;
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--ink-soft);
    font-weight: 700;
  }
  .history-cta-collapse {
    display: none;
  }
  .history-item.expanded .history-cta-expand {
    display: none;
  }
  .history-item.expanded .history-cta-collapse {
    display: inline;
  }
  .history-detail {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    border-top: 0;
  }
  .history-item.expanded .history-detail {
    max-height: 5000px;
    border-top: 1px dotted var(--rule);
  }
  .history-detail-inner {
    padding: 1.25rem;
    background: linear-gradient(180deg, rgba(239, 232, 219, 0.55) 0%, rgba(246, 241, 232, 0.9) 22%);
  }
  .history-detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 10px;
    margin-bottom: 1rem;
  }
  .history-detail-card {
    padding: 0.9rem 1rem;
    border: 1px solid var(--rule);
    background: var(--paper);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }
  .history-detail-label {
    font-family: var(--display);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--ink-faint);
    font-weight: 700;
  }
  .history-detail-card strong {
    font-family: var(--display);
    font-size: 15px;
    line-height: 1.4;
    font-weight: 600;
  }
  .history-question-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  .history-question-item {
    border: 1px solid var(--rule);
    background: var(--paper);
    overflow: hidden;
  }
  .history-question-item.correct {
    border-left: 4px solid var(--correct);
  }
  .history-question-item.wrong {
    border-left: 4px solid var(--wrong);
  }
  .history-question-item.unanswered {
    border-left: 4px solid var(--warn);
  }
  .history-question-summary {
    width: 100%;
    border: 0;
    background: transparent;
    color: inherit;
    padding: 0.95rem 1rem;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.9rem;
    text-align: left;
    cursor: pointer;
  }
  .history-question-summary:hover {
    background: var(--paper-warm);
  }
  .history-question-summary-main {
    min-width: 0;
  }
  .history-question-summary-topline {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 0.55rem;
  }
  .history-status-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 8px;
    font-family: var(--display);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 700;
  }
  .history-status-badge.correct {
    background: var(--correct-bg);
    color: var(--correct);
  }
  .history-status-badge.wrong {
    background: var(--wrong-bg);
    color: var(--wrong);
  }
  .history-status-badge.unanswered {
    background: var(--warn-bg);
    color: var(--warn);
  }
  .history-question-head {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 0.85rem;
  }
  .history-question-domain {
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-faint);
    font-weight: 700;
  }
  .history-question-preview {
    font-family: var(--body);
    font-size: 14px;
    line-height: 1.6;
    color: var(--ink);
    font-weight: 500;
  }
  .history-question-cta {
    align-self: center;
    min-width: 132px;
    display: inline-flex;
    justify-content: flex-end;
    gap: 0.35rem;
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-soft);
    font-weight: 700;
  }
  .history-question-cta-collapse {
    display: none;
  }
  .history-question-item.expanded .history-question-cta-expand {
    display: none;
  }
  .history-question-item.expanded .history-question-cta-collapse {
    display: inline;
  }
  .history-question-detail {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    border-top: 0;
  }
  .history-question-item.expanded .history-question-detail {
    max-height: 1200px;
    border-top: 1px dotted var(--rule);
  }
  .history-question-detail-inner {
    padding: 1rem;
    background: rgba(239, 232, 219, 0.35);
  }
  .history-question-text {
    font-family: var(--display);
    font-size: 16px;
    line-height: 1.55;
    font-weight: 500;
    margin-bottom: 0.9rem;
  }
  .history-answer-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
  .history-answer-block {
    border: 1px solid var(--rule-soft);
    background: rgba(239, 232, 219, 0.45);
    padding: 0.8rem 0.9rem;
  }
  .history-answer-label {
    display: block;
    font-family: var(--display);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--ink-faint);
    font-weight: 700;
    margin-bottom: 0.4rem;
  }
  .history-answer-block p {
    font-size: 14px;
    line-height: 1.6;
    color: var(--ink);
  }

  /* ============ REVIEW STAGE ============ */
  .review-filter {
    display: flex;
    gap: 8px;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    padding: 0.75rem;
    background: var(--paper-warm);
    border: 1px solid var(--rule);
  }
  .filter-btn {
    font-family: var(--display);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 6px 14px;
    border: 1px solid var(--rule);
    background: var(--paper);
    color: var(--ink-soft);
    cursor: pointer;
    transition: all 0.15s ease;
    font-weight: 600;
  }
  .filter-btn:hover { border-color: var(--ink); }
  .filter-btn.active {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--paper);
  }
  .filter-btn .badge {
    margin-left: 6px;
    font-family: var(--mono);
    font-size: 10px;
    opacity: 0.7;
  }

  .review-item {
    border: 1px solid var(--rule);
    margin-bottom: 12px;
    background: var(--paper);
    overflow: hidden;
    transition: all 0.2s ease;
  }
  .review-item.correct { border-left: 4px solid var(--correct); }
  .review-item.wrong { border-left: 4px solid var(--wrong); }
  .review-item.unanswered { border-left: 4px solid var(--warn); }

  .review-summary {
    padding: 1rem 1.25rem;
    cursor: pointer;
    display: grid;
    grid-template-columns: auto auto 1fr auto;
    gap: 16px;
    align-items: center;
    transition: background 0.15s ease;
  }
  .review-summary:hover { background: var(--paper-warm); }

  .review-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--display);
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
  }
  .review-icon.correct { background: var(--correct-bg); color: var(--correct); }
  .review-icon.wrong { background: var(--wrong-bg); color: var(--wrong); }
  .review-icon.unanswered { background: var(--warn-bg); color: var(--warn); }

  .review-num {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--ink-faint);
    font-weight: 500;
  }

  .review-preview {
    font-family: var(--body);
    font-size: 14px;
    color: var(--ink);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 500;
  }
  .review-meta {
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-faint);
    font-weight: 600;
  }

  .review-detail {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    border-top: 0;
  }
  .review-item.expanded .review-detail {
    max-height: 2000px;
    border-top: 1px dotted var(--rule);
  }
  .review-detail-inner {
    padding: 1.5rem 1.75rem;
  }

  .detail-q {
    font-family: var(--display);
    font-size: 16px;
    line-height: 1.55;
    margin-bottom: 1.25rem;
    color: var(--ink);
    font-weight: 500;
  }

  .detail-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 1.5rem;
  }
  .detail-option {
    padding: 12px 16px;
    border: 1px solid var(--rule);
    background: var(--paper);
    font-family: var(--body);
    font-size: 14px;
    line-height: 1.5;
    display: grid;
    grid-template-columns: 32px 1fr auto;
    gap: 12px;
    align-items: flex-start;
  }
  .detail-option.user-correct {
    background: var(--correct-bg);
    border-color: var(--correct);
  }
  .detail-option.user-wrong {
    background: var(--wrong-bg);
    border-color: var(--wrong);
  }
  .detail-option.right-answer {
    background: var(--correct-bg);
    border-color: var(--correct);
  }
  .detail-option-letter {
    font-family: var(--display);
    font-size: 15px;
    color: var(--ink-faint);
    font-weight: 600;
  }
  .detail-option-tag {
    font-family: var(--display);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 2px 8px;
    font-weight: 700;
    white-space: nowrap;
    align-self: center;
  }
  .detail-option-tag.your { background: var(--wrong); color: var(--paper); }
  .detail-option-tag.right { background: var(--correct); color: var(--paper); }
  .detail-option-tag.both { background: var(--correct); color: var(--paper); }

  .detail-explain {
    background: var(--paper-warm);
    border-left: 3px solid var(--accent);
    padding: 1.25rem 1.5rem;
    font-family: var(--body);
    font-size: 14px;
    line-height: 1.7;
  }
  .detail-explain-label {
    font-family: var(--display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--accent);
    font-weight: 700;
    margin-bottom: 8px;
    display: block;
  }

  .actions-bar {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--rule);
    flex-wrap: wrap;
  }

  .review-title {
    font-family: var(--display);
    font-size: 36px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
  }
  .review-subtitle {
    text-align: center;
    color: var(--ink-soft);
    margin-bottom: 2rem;
    font-size: 15px;
  }

  /* Modal */
  .modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(26, 22, 20, 0.5);
    z-index: 100;
    align-items: center;
    justify-content: center;
    padding: 1rem;
  }
  .modal-overlay.active { display: flex; }
  .modal {
    background: var(--paper);
    border: 1px solid var(--ink);
    padding: 2.5rem;
    max-width: 480px;
    width: 100%;
    text-align: center;
    box-shadow: 4px 4px 0 var(--ink);
  }
  .modal h3 {
    font-family: var(--display);
    font-size: 26px;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
  }
  .modal p {
    font-family: var(--body);
    color: var(--ink-soft);
    margin-bottom: 1.5rem;
    font-size: 15px;
  }
  .modal-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
  }

  @media (max-width: 600px) {
    .container { padding: 2rem 1rem 4rem; }
    .question-shell { padding: 1.25rem 1rem 1.5rem; }
    .question-shell-head {
      flex-direction: column;
      align-items: stretch;
    }
    .question-stepper {
      justify-content: flex-start;
      max-width: none;
    }
    .q-text { font-size: 17px; }
    .option { font-size: 14px; padding: 14px 14px; }
    .question-nav {
      flex-wrap: wrap;
    }
    .question-nav-meta {
      width: 100%;
      order: -1;
      text-align: left;
    }
    .result-overview-card,
    .history-summary {
      grid-template-columns: 1fr;
    }
    .result-overview-meta,
    .history-summary-stats,
    .history-answer-grid {
      grid-template-columns: 1fr;
    }
    .history-question-summary {
      grid-template-columns: 1fr;
    }
    .history-summary-stats {
      min-width: 0;
    }
    .history-question-head {
      align-items: flex-start;
      flex-direction: column;
      gap: 0.35rem;
    }
    .history-question-cta {
      justify-content: flex-start;
      min-width: 0;
    }
    .nav-btn {
      flex: 1;
      min-width: 0;
    }
    .review-summary { grid-template-columns: auto 1fr; }
    .review-summary .review-num, .review-summary .review-meta { display: none; }
    .lang-toggle { top: 0.75rem; right: 0.75rem; }
    .lang-btn { padding: 6px 10px; font-size: 10px; }
    .submit-bar {
      align-items: stretch;
    }
    .submit-bar-left,
    .submit-bar-right {
      width: 100%;
      justify-content: space-between;
    }
  }