:root {
  color-scheme: dark;
  --bg: #08101c;
  --surface: #101a2a;
  --surface-2: #152235;
  --border: #26364c;
  --text: #edf3f8;
  --muted: #9babc0;
  --accent: #6ee7d2;
  --accent-2: #f5b84b;
  --red: #ff817b;
  --green: #68d391;
  --max: 1380px;
  --reading: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(38, 54, 76, .85);
  background: rgba(8, 16, 28, .94);
  backdrop-filter: blur(14px);
}

.header-inner,
.wrap {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 760;
  letter-spacing: .04em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border: 1px solid var(--accent);
  display: grid;
  place-items: center;
  color: var(--accent);
  font-size: 13px;
}

.site-nav { display: flex; gap: 22px; color: var(--muted); font-size: 14px; }

.hero {
  padding: 78px 0 58px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: .16em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.25; letter-spacing: -.025em; }
h1 { max-width: 1120px; margin: 0; font-size: clamp(38px, 6vw, 72px); }
h2 { margin: 0; font-size: clamp(26px, 3vw, 38px); }
h3 { margin: 0; font-size: 20px; }

.hero-copy {
  max-width: 900px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.hero-meta {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 3px 10px;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

.tag.hot { border-color: rgba(110, 231, 210, .48); color: var(--accent); }
.tag.warn { border-color: rgba(245, 184, 75, .5); color: var(--accent-2); }

.section { padding: 58px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
.section-note { margin: 0; color: var(--muted); font-size: 14px; }

.post-list { display: grid; border-top: 1px solid var(--border); }

.post-card {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  padding: 27px 0;
  border-bottom: 1px solid var(--border);
  transition: color .18s ease, padding-left .18s ease;
}

.post-card:hover { padding-left: 8px; }
.post-date { color: var(--muted); font-variant-numeric: tabular-nums; font-size: 14px; }
.post-title { margin-bottom: 7px; font-size: 22px; font-weight: 720; letter-spacing: -.015em; }
.post-summary { color: var(--muted); font-size: 15px; line-height: 1.6; }
.post-arrow { color: var(--accent); font-size: 22px; }

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.method-item { padding: 25px; background: var(--surface); }
.method-number { color: var(--accent-2); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.method-item h3 { margin-top: 12px; }
.method-item p { margin: 10px 0 0; color: var(--muted); font-size: 15px; }

.site-footer { border-top: 1px solid var(--border); padding: 34px 0 48px; color: var(--muted); font-size: 13px; }
.footer-inner { display: flex; justify-content: space-between; gap: 24px; }

.article-shell { width: min(calc(100% - 56px), var(--reading)); margin: 0 auto; }
.article-header { padding: 64px 0 36px; border-bottom: 1px solid var(--border); }
.article-header h1 { font-size: clamp(34px, 6vw, 58px); }
.article-lead { margin: 20px 0 0; color: #c8d4e2; font-size: 20px; line-height: 1.65; }
.article-meta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; color: var(--muted); font-size: 13px; }
.article-body { padding: 42px 0 80px; }
.article-body section { margin-top: 48px; }
.article-body section:first-child { margin-top: 0; }
.article-body h2 { margin-bottom: 20px; font-size: 27px; }
.article-body h3 { margin-top: 28px; margin-bottom: 10px; color: #dfe8f1; }
.article-body p { margin: 14px 0; }
.article-body ul, .article-body ol { padding-left: 1.25em; }
.article-body li { margin: 8px 0; }
.article-body strong { color: #fff; }

.thesis {
  margin: 0 0 32px;
  padding: 22px 24px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  color: #dfe9f2;
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 24px 0;
}

.data-card { padding: 18px 20px; border: 1px solid var(--border); background: var(--surface); }
.data-label { color: var(--muted); font-size: 12px; letter-spacing: .08em; }
.data-value { margin-top: 5px; font-size: 21px; font-weight: 760; font-variant-numeric: tabular-nums; }
.up { color: var(--red); }
.down { color: var(--green); }

.structure-table { width: 100%; border-collapse: collapse; margin: 22px 0; font-size: 14px; line-height: 1.55; }
.structure-table th, .structure-table td { padding: 12px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.structure-table th { color: var(--muted); font-size: 12px; letter-spacing: .04em; }

.checklist { counter-reset: checks; list-style: none; padding: 0 !important; }
.checklist li { position: relative; padding: 13px 0 13px 44px; border-bottom: 1px solid var(--border); }
.checklist li::before {
  counter-increment: checks;
  content: counter(checks, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 14px;
  color: var(--accent-2);
  font-size: 12px;
  font-weight: 800;
}

.disclaimer { margin-top: 60px; padding-top: 22px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; }
.back-link { display: inline-flex; margin-bottom: 20px; color: var(--accent); font-size: 14px; }

.framework-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 38px;
  border: 1px solid var(--border);
  background: var(--border);
}

.flow-step { min-height: 138px; padding: 20px; background: var(--surface); }
.flow-step strong { display: block; margin: 6px 0 8px; font-size: 18px; }
.flow-step p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.6; }
.flow-index { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .1em; }

.framework-note {
  margin: 26px 0;
  padding: 20px 22px;
  border: 1px solid rgba(245, 184, 75, .45);
  color: #dde7f0;
  background: rgba(245, 184, 75, .05);
}

.system-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  color: var(--accent);
  font-weight: 700;
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .header-inner, .wrap, .article-shell { width: min(calc(100% - 28px), var(--max)); }
  .site-nav a:not(:first-child) { display: none; }
  .hero { padding: 52px 0 42px; }
  .hero-copy { font-size: 16px; }
  .section { padding: 42px 0; }
  .section-head { display: block; }
  .section-note { margin-top: 8px; }
  .post-card { grid-template-columns: 1fr auto; gap: 8px 18px; }
  .post-date { grid-column: 1 / -1; }
  .post-arrow { grid-column: 2; grid-row: 2; }
  .method-grid { grid-template-columns: 1fr; }
  .framework-flow { grid-template-columns: 1fr 1fr; }
  .footer-inner { display: block; }
  .footer-inner span { display: block; margin-top: 8px; }
  .article-header { padding-top: 46px; }
  .article-lead { font-size: 18px; }
  .data-grid { grid-template-columns: 1fr; }
  .structure-table { display: block; overflow-x: auto; white-space: nowrap; }
}

@media (max-width: 520px) {
  .framework-flow { grid-template-columns: 1fr; }
}