:root {
    --bg: #f5efe4;
    --bg2: #ece4d3;
    --ink: #1b2237;
    --ink-soft: #4d5570;
    --rule: #2a2f44;
    --accent: #c8553d;
    --accent-2: #2e5e7e;
    --accent-3: #8a9a5b;
    --accent-4: #d4a017;
  }
  * { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; }
  body {
    background: var(--bg);
    color: var(--ink);
    font-family: 'Pretendard', system-ui, -apple-system, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
    font-feature-settings: 'tnum' 1, 'ss01' 1;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
  }
  .wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }
  header.hero {
    padding: 88px 0 56px;
    border-bottom: 1px solid var(--ink);
  }
  .eyebrow {
    font-size: 13px; letter-spacing: 0.22em; text-transform: uppercase;
    color: var(--ink-soft); margin-bottom: 24px;
  }
  h1 {
    font-size: clamp(40px, 6.5vw, 76px);
    font-weight: 800;
    line-height: 1.02;
    letter-spacing: -0.02em;
    margin: 0 0 24px;
  }
  h1 .accent { color: var(--accent); }
  .lede {
    font-size: 19px;
    max-width: 640px;
    color: var(--ink-soft);
    margin: 0;
  }
  .kpi-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    border-top: 1px solid var(--ink);
    margin-top: 56px;
  }
  .kpi {
    padding: 24px 0 8px;
    border-right: 1px solid var(--ink);
  }
  .kpi:last-child { border-right: none; }
  .kpi .v {
    font-size: 36px; font-weight: 700; letter-spacing: -0.02em;
    line-height: 1; margin-bottom: 8px;
    font-variant-numeric: tabular-nums;
  }
  .kpi .v small { font-size: 16px; font-weight: 500; color: var(--ink-soft); margin-left: 4px; }
  .kpi .l { font-size: 13px; color: var(--ink-soft); }
  @media (max-width: 720px) {
    .kpi-strip { grid-template-columns: repeat(2, 1fr); }
    .kpi { padding: 18px 14px 8px; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
    .kpi:nth-child(2n) { border-right: none; }
    .kpi:nth-last-child(-n+2) { border-bottom: none; }
  }

  section.chapter {
    padding: 88px 0 24px;
    border-bottom: 1px solid var(--ink);
  }
  .chapter:last-of-type { border-bottom: none; }
  .ch-num {
    font-size: 13px; letter-spacing: 0.22em; text-transform: uppercase;
    color: var(--accent); font-weight: 700;
  }
  .ch-num::before { content: ""; display: inline-block; width: 32px; height: 1px; background: var(--accent); vertical-align: middle; margin-right: 12px; }
  h2 {
    font-size: clamp(28px, 3.6vw, 40px);
    font-weight: 700; letter-spacing: -0.015em; line-height: 1.15;
    margin: 14px 0 16px;
  }
  .dek {
    font-size: 17px;
    color: var(--ink-soft);
    max-width: 680px;
    margin: 0 0 32px;
  }
  .dek b { color: var(--ink); font-weight: 600; }
  .chart {
    width: 100%;
    background: var(--bg);
  }
  .chart-area { height: 460px; }
  .chart-tree { height: 560px; }
  .chart-pareto { height: 420px; }
  .chart-heat { height: 720px; }

  /* Top list */
  .toplist {
    margin-top: 32px;
    border-top: 1px solid var(--ink);
  }
  .row {
    display: grid;
    grid-template-columns: 44px 1fr 110px 100px 110px;
    align-items: center;
    padding: 14px 0;
    border-bottom: 1px solid rgba(27, 34, 55, 0.15);
    text-decoration: none;
    color: var(--ink);
    transition: background 0.15s;
  }
  .row:hover { background: var(--bg2); }
  .row .rk { font-size: 14px; color: var(--ink-soft); font-variant-numeric: tabular-nums; font-weight: 600; }
  .row .nm { font-weight: 500; padding-right: 16px; }
  .row .nm small { display: block; font-size: 12px; color: var(--ink-soft); font-weight: 400; margin-top: 3px; }
  .row .tg {
    font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
    padding: 3px 8px; border: 1px solid var(--ink); border-radius: 999px;
    display: inline-block; justify-self: start;
  }
  .row .tg.api { background: var(--accent-2); color: #fff; border-color: var(--accent-2); }
  .row .tg.std { background: var(--accent-4); color: var(--ink); border-color: var(--accent-4); }
  .row .vw { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }
  .row .cat { text-align: right; font-size: 13px; color: var(--ink-soft); }
  @media (max-width: 720px) {
    .row { grid-template-columns: 36px 1fr 80px; }
    .row .tg, .row .cat { display: none; }
  }

  footer {
    padding: 56px 0 80px;
    color: var(--ink-soft);
    font-size: 14px;
    border-top: 1px solid var(--ink);
  }
  footer a { color: var(--ink); }
  footer .src { margin-top: 8px; }

  /* tiny embellishments */
  .pull {
    font-size: clamp(22px, 2.6vw, 28px);
    line-height: 1.4;
    font-weight: 600;
    color: var(--ink);
    border-left: 3px solid var(--accent);
    padding: 6px 0 6px 20px;
    margin: 28px 0 32px;
    max-width: 720px;
  }
  .pull em { font-style: normal; color: var(--accent); }

  .legend-note {
    font-size: 13px; color: var(--ink-soft); margin-top: 14px;
  }

  /* ───── Drill panel ───── */
  .panel-scrim {
    position: fixed; inset: 0;
    background: rgba(27, 34, 55, 0.42);
    opacity: 0; pointer-events: none;
    transition: opacity .25s ease;
    z-index: 50;
  }
  .panel-scrim.open { opacity: 1; pointer-events: auto; }
  .panel {
    position: fixed; top: 0; right: 0; bottom: 0;
    width: min(520px, 100vw);
    background: var(--bg);
    border-left: 1px solid var(--ink);
    transform: translateX(100%);
    transition: transform .3s cubic-bezier(.4,.0,.2,1);
    z-index: 51;
    display: flex; flex-direction: column;
    box-shadow: -8px 0 24px rgba(0,0,0,0.08);
  }
  .panel.open { transform: translateX(0); }
  .panel-head {
    padding: 24px 28px 18px;
    border-bottom: 1px solid var(--ink);
    flex-shrink: 0;
  }
  .panel-eyebrow {
    font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase;
    color: var(--accent); font-weight: 700; margin-bottom: 8px;
  }
  .panel-title { font-size: 22px; font-weight: 700; letter-spacing: -0.01em; line-height: 1.25; margin: 0 0 6px; }
  .panel-sub { font-size: 13px; color: var(--ink-soft); }
  .panel-close {
    position: absolute; top: 18px; right: 22px;
    background: transparent; border: none; cursor: pointer;
    font-size: 24px; color: var(--ink); line-height: 1;
    padding: 6px;
  }
  .panel-close:hover { color: var(--accent); }
  .panel-body { flex: 1; overflow-y: auto; padding: 16px 24px 32px; }

  /* ───── Card ───── */
  .card {
    display: block;
    padding: 16px 0;
    border-bottom: 1px solid rgba(27,34,55,0.12);
    text-decoration: none;
    color: var(--ink);
    transition: background .15s, padding-left .15s;
  }
  .card:hover { background: var(--bg2); padding-left: 8px; padding-right: 8px; }
  .card-row1 { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }
  .card-tag {
    font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase;
    padding: 2px 7px; border: 1px solid var(--ink); border-radius: 999px;
    font-weight: 600; flex-shrink: 0;
  }
  .card-tag.api { background: var(--accent-2); color: #fff; border-color: var(--accent-2); }
  .card-tag.std { background: var(--accent-4); color: var(--ink); border-color: var(--accent-4); }
  .card-name { font-weight: 500; font-size: 15px; line-height: 1.35; flex: 1; }
  .card-meta { font-size: 12px; color: var(--ink-soft); display: flex; gap: 12px; flex-wrap: wrap; }
  .card-meta b { color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
  .card-meta .dot { color: rgba(27,34,55,0.3); }

  /* ───── Chapter 06 — filters & grid ───── */
  .toolbar {
    display: flex; flex-direction: column; gap: 18px;
    margin: 32px 0 24px;
    padding: 22px 0;
    border-top: 1px solid var(--ink);
    border-bottom: 1px solid var(--ink);
  }
  .search-row {
    display: flex; gap: 12px; align-items: center;
  }
  .search-input {
    flex: 1;
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--ink);
    font: inherit;
    font-size: 18px;
    color: var(--ink);
    padding: 10px 0;
    outline: none;
  }
  .search-input::placeholder { color: var(--ink-soft); }
  .search-input:focus { border-bottom-color: var(--accent); }
  .sort-select {
    background: transparent;
    border: 1px solid var(--ink);
    border-radius: 999px;
    padding: 8px 14px;
    font: inherit;
    font-size: 13px;
    color: var(--ink);
    cursor: pointer;
  }
  .facets {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 6px 18px;
    align-items: start;
  }
  .facet-label {
    font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase;
    color: var(--ink-soft); font-weight: 600; padding-top: 6px;
  }
  .facet-chips {
    display: flex; flex-wrap: wrap; gap: 6px;
  }
  .chip {
    background: transparent;
    border: 1px solid rgba(27,34,55,0.35);
    border-radius: 999px;
    padding: 5px 12px;
    font: inherit;
    font-size: 12px;
    color: var(--ink);
    cursor: pointer;
    transition: all .15s;
    font-variant-numeric: tabular-nums;
  }
  .chip:hover { border-color: var(--ink); }
  .chip.active {
    background: var(--ink); color: var(--bg);
    border-color: var(--ink);
  }
  .chip .ct { color: rgba(255,255,255,0.5); margin-left: 4px; font-size: 11px; }
  .chip:not(.active) .ct { color: var(--ink-soft); margin-left: 4px; font-size: 11px; }
  .results-bar {
    display: flex; justify-content: space-between; align-items: center;
    margin: 20px 0 12px;
    font-size: 14px; color: var(--ink-soft);
  }
  .results-bar b { color: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums; }
  .reset-btn {
    background: transparent; border: none; color: var(--accent); font: inherit;
    font-size: 13px; cursor: pointer; text-decoration: underline;
  }
  .cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0 28px;
    border-top: 1px solid rgba(27,34,55,0.2);
  }
  @media (max-width: 720px) {
    .cards { grid-template-columns: 1fr; }
  }
  .load-more {
    display: block;
    margin: 32px auto 0;
    background: transparent;
    border: 1px solid var(--ink);
    color: var(--ink);
    font: inherit;
    padding: 12px 32px;
    cursor: pointer;
    border-radius: 999px;
    transition: all .15s;
  }
  .load-more:hover { background: var(--ink); color: var(--bg); }
  .load-more:disabled { opacity: 0.3; cursor: not-allowed; }
  .empty-state {
    padding: 60px 0;
    text-align: center;
    color: var(--ink-soft);
  }

  /* ───── Discovery ───── */
  .discovery {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
    margin-top: 28px;
  }
  @media (max-width: 720px) { .discovery { grid-template-columns: 1fr; } }
  .discover-card {
    border: 1px solid var(--ink);
    padding: 20px 22px;
    text-decoration: none;
    color: var(--ink);
    background: var(--bg);
    transition: transform .15s, background .15s;
    display: flex; flex-direction: column; gap: 10px;
    min-height: 160px;
  }
  .discover-card:hover { background: var(--bg2); transform: translateY(-2px); }
  .discover-card .dc-label {
    font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
    color: var(--accent); font-weight: 700;
  }
  .discover-card .dc-name {
    font-weight: 600; font-size: 16px; line-height: 1.35; flex: 1;
  }
  .discover-card .dc-meta {
    font-size: 12px; color: var(--ink-soft);
  }
  .reroll {
    margin-top: 18px;
    background: transparent; border: 1px dashed var(--ink-soft);
    color: var(--ink); padding: 8px 18px; cursor: pointer;
    font: inherit; font-size: 13px; border-radius: 999px;
  }
  .reroll:hover { border-style: solid; border-color: var(--accent); color: var(--accent); }

  /* ───── Search summary ───── */
  .search-summary {
    background: var(--bg2);
    padding: 14px 18px;
    margin: 16px 0 8px;
    border-left: 3px solid var(--accent);
    font-size: 14px;
  }
  .search-summary .ss-head { font-weight: 600; margin-bottom: 6px; }
  .search-summary .ss-head .ss-q { color: var(--accent); }
  .search-summary .ss-stats { color: var(--ink-soft); font-size: 13px; }
  .search-summary .ss-stats b { color: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums; }
  .search-summary .ss-std {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed rgba(27,34,55,0.18);
    font-size: 13px;
  }
  .search-summary .ss-std .star { color: var(--accent-4); font-weight: 700; margin-right: 4px; }
  .search-summary .ss-std a { color: var(--ink); text-decoration: underline; text-decoration-color: rgba(27,34,55,0.3); }
  .search-summary .ss-std a:hover { text-decoration-color: var(--accent); color: var(--accent); }
  .search-summary .ss-orgs { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
  .search-summary .ss-org {
    background: transparent;
    border: 1px solid rgba(46,94,126,0.4);
    color: var(--accent-2);
    padding: 3px 10px; border-radius: 999px;
    font-size: 12px; cursor: pointer; font: inherit;
    font-variant-numeric: tabular-nums;
  }
  .search-summary .ss-org:hover { background: var(--accent-2); color: #fff; border-color: var(--accent-2); }

  .loading-shim {
    padding: 40px 0; text-align: center; color: var(--ink-soft); font-size: 14px;
  }
  .loading-shim::after {
    content: ""; display: inline-block;
    width: 12px; height: 12px; margin-left: 10px;
    border: 2px solid var(--ink-soft); border-top-color: transparent;
    border-radius: 50%; vertical-align: middle;
    animation: spin .9s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }

.src-list-index { display: grid; grid-template-columns: 1fr; gap: 12px; }
  .src-list-index .src-item { padding: 10px 0; border-top: 1px solid rgba(27,34,55,0.18); }
  .src-list-index .src-item a { color: var(--ink); font-weight: 600; text-decoration: underline; text-decoration-color: rgba(27,34,55,0.3); }
  .src-list-index .src-item a:hover { text-decoration-color: var(--accent); color: var(--accent); }
  .src-list-index .src-meta { font-size: 12px; color: var(--ink-soft); margin-top: 3px; }
  .src-list-index .src-note { font-size: 12px; color: var(--ink-soft); margin-top: 6px; line-height: 1.45; }