:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --series-1: #2a78d6;
  --accent-wash: rgba(42, 120, 214, 0.10);
  --good-text: #006300;
  --critical: #d03b3b;
  --err-wash: rgba(208, 59, 59, 0.13);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --series-1: #3987e5;
    --accent-wash: rgba(57, 135, 229, 0.16);
    --good-text: #0ca30c;
    --err-wash: rgba(230, 103, 103, 0.20);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
}

main { max-width: 960px; margin: 0 auto; padding: 48px 20px 64px; }

a { color: var(--series-1); }

header { margin-bottom: 40px; }
.eyebrow { margin: 0; color: var(--muted); font-size: 14px; }
h1 { margin: 4px 0 12px; font-size: 32px; line-height: 1.25; }
.lede { margin: 0; color: var(--ink-2); max-width: 720px; }
.links { margin: 12px 0 0; font-size: 14px; color: var(--muted); }

section { margin-top: 48px; }
h2 { font-size: 22px; margin: 0 0 4px; }
h3 { font-size: 17px; margin: 28px 0 8px; }
.section-note { margin: 0 0 16px; color: var(--ink-2); font-size: 14px; }

/* 요약 타일 */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.tile {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}
.tile-label { color: var(--ink-2); font-size: 14px; }
.tile-value { font-size: 36px; font-weight: 600; line-height: 1.2; margin: 6px 0; }
.tile-value .from { color: var(--muted); font-weight: 400; }
.tile-value .arrow { color: var(--muted); font-weight: 400; font-size: 24px; }
.tile-delta { font-size: 14px; font-weight: 600; }
.tile-delta.good { color: var(--good-text); }
.tile-delta.bad { color: var(--critical); }
.tile-note { color: var(--muted); font-size: 13px; margin-top: 8px; }

.metrics {
  margin-top: 16px;
  border-collapse: collapse;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}
.metrics th, .metrics td { padding: 6px 16px 6px 0; text-align: right; border-bottom: 1px solid var(--grid); }
.metrics th:first-child, .metrics td:first-child { text-align: left; }
.metrics th { color: var(--muted); font-weight: 500; }

/* 파인튜닝의 가치 */
.points { padding-left: 20px; margin: 0 0 20px; color: var(--ink-2); }
.points li { margin: 10px 0; }
.points strong { color: var(--ink); }
.points .example { display: block; margin-top: 4px; font-size: 14px; color: var(--muted); }
.points q { color: var(--ink-2); }
.notice {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--series-1);
  border-radius: 8px;
  padding: 14px 18px;
  color: var(--ink-2);
  font-size: 15px;
}
.notice p { margin: 0; }
.notice .notice-title { color: var(--ink); font-weight: 600; margin-bottom: 4px; }
.notice strong { color: var(--ink); }

/* 탭 */
.tabs { display: flex; gap: 4px; margin: 12px 0; border-bottom: 1px solid var(--grid); }
.tabs button {
  font: inherit;
  font-size: 15px;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--ink-2);
  padding: 8px 12px;
  cursor: pointer;
  margin-bottom: -1px;
}
.tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--series-1); font-weight: 600; }
.tabs button:focus-visible { outline: 2px solid var(--series-1); outline-offset: 2px; }

.marks-legend { font-size: 13px; color: var(--muted); margin: 0 0 16px; }

/* 샘플 카드 */
.samples { display: grid; gap: 12px; }
.sample {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
}
.sample-head { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.sample-no { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; min-width: 28px; }
.sample-head audio { height: 36px; flex: 1; max-width: 360px; }
.dur { color: var(--muted); font-size: 13px; }

.sample dl { margin: 0; display: grid; grid-template-columns: 120px 1fr; gap: 4px 12px; align-items: baseline; }
.sample dt { color: var(--ink-2); font-size: 13px; display: flex; justify-content: space-between; gap: 8px; }
.sample dt .cer { color: var(--muted); font-variant-numeric: tabular-nums; }
.sample dd { margin: 0; font-size: 16px; word-break: keep-all; overflow-wrap: anywhere; }
.sample dd.ref { font-weight: 600; }
.sample dd.empty { color: var(--muted); font-style: italic; }

mark.err {
  background: var(--err-wash);
  color: inherit;
  text-decoration: underline wavy var(--critical);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  border-radius: 2px;
}
.del { color: var(--critical); font-weight: 700; margin: 0 1px; }

@media (max-width: 560px) {
  .sample dl { grid-template-columns: 1fr; }
  .sample dt { margin-top: 6px; }
}

/* 차트 */
.charts { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 16px; }
.chart-card {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 16px 12px;
  position: relative;
}
.chart-card figcaption .title { font-weight: 600; }
.chart-card figcaption .sub { color: var(--ink-2); font-size: 13px; }
svg.chart { width: 100%; height: auto; display: block; margin-top: 8px; overflow: visible; }
svg.chart:focus-visible { outline: 2px solid var(--series-1); outline-offset: 4px; border-radius: 4px; }
.chart .grid { stroke: var(--grid); stroke-width: 1; }
.chart .axis { stroke: var(--axis); stroke-width: 1; }
.chart .tick { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.chart .line { fill: none; stroke: var(--series-1); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart .area { fill: var(--accent-wash); stroke: none; }
.chart .dot { fill: var(--series-1); stroke: var(--surface); stroke-width: 2; }
.chart .label { fill: var(--ink-2); font-size: 12px; font-variant-numeric: tabular-nums; }
.chart .cross { stroke: var(--axis); stroke-width: 1; }
.chart .hit { fill: transparent; }

.tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 12px;
  white-space: nowrap;
  transform: translate(-50%, calc(-100% - 12px));
  font-variant-numeric: tabular-nums;
}
.tooltip[hidden] { display: none; }

details.table-view { margin-top: 8px; font-size: 13px; color: var(--ink-2); }
details.table-view summary { cursor: pointer; }
details.table-view table { border-collapse: collapse; margin-top: 6px; font-variant-numeric: tabular-nums; }
details.table-view td, details.table-view th { padding: 2px 16px 2px 0; text-align: right; border-bottom: 1px solid var(--grid); }

/* 설명 */
.pipeline { padding-left: 20px; color: var(--ink-2); }
.pipeline li { margin: 6px 0; }
.pipeline strong { color: var(--ink); }
.caveats { padding-left: 20px; color: var(--ink-2); }
.caveats li { margin: 6px 0; }

footer { margin-top: 56px; padding-top: 16px; border-top: 1px solid var(--grid); color: var(--muted); font-size: 13px; }