:root {
  --bg: #0c0b09;
  --bg2: #131210;
  --bg3: #1a1814;
  --amber: #e8a838;
  --amber-dim: #a87820;
  --signal: #69b8a8;
  --signal-dim: #315f58;
  --risk: #d38172;
  --text: #ede8dd;
  --text-muted: #a09383;
  --text-dim: #6b6054;
  --border: #2a2520;
  --border-strong: #423a30;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-size: 15px;
  line-height: 1.75;
  letter-spacing: 0;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.035;
  pointer-events: none;
  z-index: 1000;
}

a { color: inherit; }

[data-lang="zh"] .lang-en,
[data-lang="en"] .lang-zh { display: none !important; }

.shell {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.article-shell {
  width: min(780px, calc(100% - 48px));
  margin: 0 auto;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(12, 11, 9, 0.94);
  backdrop-filter: blur(14px);
}

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

.brand {
  color: var(--amber);
  font-family: 'DM Serif Display', serif;
  font-size: 18px;
  text-decoration: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-decoration: none;
  text-transform: uppercase;
}

.nav-link:hover { color: var(--amber); }

.lang-toggle {
  min-width: 50px;
  min-height: 32px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
}

.lang-toggle:hover { border-color: var(--amber-dim); color: var(--amber); }

.research-hero {
  min-height: 560px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.research-hero::after {
  content: '08';
  position: absolute;
  right: max(24px, calc((100vw - 1120px) / 2));
  bottom: -70px;
  color: rgba(232, 168, 56, 0.045);
  font-family: 'DM Serif Display', serif;
  font-size: 260px;
  line-height: 1;
  pointer-events: none;
}

.eyebrow {
  color: var(--signal);
  font-size: 11px;
  letter-spacing: 0.16em;
  margin-bottom: 22px;
  text-transform: uppercase;
}

.research-hero h1,
.article-hero h1 {
  max-width: 900px;
  color: var(--text);
  font-family: 'DM Serif Display', 'Noto Serif SC', serif;
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: 0;
}

.research-hero h1 { font-size: 58px; }

.hero-deck {
  max-width: 680px;
  margin-top: 28px;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.9;
}

.hero-note {
  margin-top: 28px;
  color: var(--text-dim);
  font-size: 11px;
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-bottom: 1px solid var(--border);
}

.metric {
  min-height: 150px;
  padding: 32px;
  border-right: 1px solid var(--border);
}

.metric:last-child { border-right: 0; }

.metric-value {
  color: var(--amber);
  font-family: 'DM Serif Display', serif;
  font-size: 36px;
  line-height: 1;
}

.metric-label {
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 12px;
}

.metric-source {
  margin-top: 8px;
  color: var(--text-dim);
  font-size: 10px;
}

.section {
  padding: 88px 0;
  border-bottom: 1px solid var(--border);
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 42px;
}

.section-kicker {
  color: var(--amber-dim);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-heading h2,
.article-section h2 {
  font-family: 'DM Serif Display', 'Noto Serif SC', serif;
  font-weight: 400;
  letter-spacing: 0;
}

.section-heading h2 { margin-top: 8px; font-size: 34px; }

.text-link {
  color: var(--signal);
  font-size: 12px;
  text-decoration: none;
}

.text-link:hover { text-decoration: underline; }

.feature-report {
  display: grid;
  grid-template-columns: minmax(230px, 0.75fr) minmax(0, 1.25fr);
  border-top: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
}

.feature-code {
  min-height: 350px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 38px;
  border-right: 1px solid var(--border-strong);
  background: var(--bg2);
}

.feature-code strong {
  color: var(--amber);
  font-family: 'DM Serif Display', serif;
  font-size: 72px;
  font-weight: 400;
  line-height: 0.9;
}

.feature-code span { color: var(--text-dim); font-size: 11px; }

.feature-body {
  min-height: 350px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 46px;
}

.feature-meta {
  color: var(--signal);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.feature-body h3 {
  margin: 18px 0;
  font-family: 'DM Serif Display', 'Noto Serif SC', serif;
  font-size: 34px;
  font-weight: 400;
  line-height: 1.3;
}

.feature-body p { color: var(--text-muted); font-size: 13px; }

.feature-cta {
  align-self: flex-start;
  margin-top: 28px;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--amber-dim);
  color: var(--amber);
  font-size: 12px;
  text-decoration: none;
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.signal-card {
  min-height: 250px;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg2);
}

.signal-card .number { color: var(--signal); font-size: 11px; }

.signal-card h3 {
  margin: 26px 0 14px;
  font-family: 'DM Serif Display', 'Noto Serif SC', serif;
  font-size: 23px;
  font-weight: 400;
  line-height: 1.35;
}

.signal-card p { color: var(--text-muted); font-size: 12px; }

.signal-card a {
  display: inline-block;
  margin-top: 20px;
  color: var(--text-dim);
  font-size: 10px;
  text-decoration: none;
}

.signal-card a:hover { color: var(--amber); }

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 36px;
}

.method-step { border-top: 1px solid var(--border-strong); padding-top: 20px; }
.method-step strong { color: var(--amber); font-size: 11px; }
.method-step h3 { margin: 14px 0 10px; font-size: 14px; font-weight: 500; }
.method-step p { color: var(--text-muted); font-size: 12px; }

.chain-map {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--border-strong);
  border-left: 1px solid var(--border-strong);
}

.chain-layer {
  min-height: 170px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 22px;
  border-right: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
  background: var(--bg2);
  color: var(--text-muted);
  text-decoration: none;
}

.chain-layer .chain-index { color: var(--text-dim); font-size: 10px; }
.chain-layer strong { color: var(--text); font-size: 13px; font-weight: 500; }
.chain-layer small { color: var(--text-dim); font-size: 9px; text-transform: uppercase; }
.chain-layer.is-live { background: var(--bg3); }
.chain-layer.is-live .chain-index,
.chain-layer.is-live small { color: var(--signal); }
.chain-layer.is-live:hover { background: #201d18; }
.chain-layer.is-next { border-top: 2px solid var(--amber-dim); }
.chain-layer.is-next small { color: var(--amber-dim); }
.chain-note { max-width: 760px; margin-top: 24px; color: var(--text-muted); font-size: 12px; }

.report-list { border-top: 1px solid var(--border-strong); }

.report-row {
  min-height: 132px;
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr) 30px;
  align-items: center;
  gap: 24px;
  padding: 24px 6px;
  border-bottom: 1px solid var(--border-strong);
  text-decoration: none;
}

.report-row:hover .report-title strong,
.report-row:hover .report-arrow { color: var(--amber); }
.report-no { color: var(--signal); font-size: 11px; }
.report-title { display: flex; flex-direction: column; gap: 8px; }
.report-title strong { font-family: 'DM Serif Display', 'Noto Serif SC', serif; font-size: 24px; font-weight: 400; line-height: 1.35; }
.report-title small { color: var(--text-dim); font-size: 9px; text-transform: uppercase; }
.report-arrow { color: var(--text-dim); text-align: right; }

.article-hero {
  padding: 92px 0 72px;
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  display: flex;
  gap: 8px;
  margin-bottom: 34px;
  color: var(--text-dim);
  font-size: 10px;
}

.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { color: var(--amber); }
.article-hero h1 { font-size: 52px; }

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 28px;
  color: var(--text-dim);
  font-size: 10px;
}

.confidence {
  color: var(--signal);
  border: 1px solid var(--signal-dim);
  border-radius: 2px;
  padding: 1px 7px;
}

.thesis {
  margin: 54px 0;
  padding: 30px 32px;
  border-left: 3px solid var(--amber);
  background: var(--bg2);
  color: var(--text);
  font-family: 'Noto Serif SC', 'DM Serif Display', serif;
  font-size: 19px;
  line-height: 1.9;
}

.lang-en .thesis { font-family: 'DM Serif Display', serif; }

.report-image {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 0 64px;
  border: 1px solid var(--border);
}

.article-section { margin: 64px 0; }
.article-section h2 { margin-bottom: 24px; font-size: 30px; }
.article-section h3 { margin: 34px 0 14px; font-size: 16px; font-weight: 500; }
.article-section p { color: var(--text-muted); }
.article-section p + p { margin-top: 18px; }

.article-section ul {
  margin: 18px 0 0 20px;
  color: var(--text-muted);
}

.article-section li + li { margin-top: 12px; }

.power-visual {
  margin: 42px 0 54px;
  padding: 28px;
  border: 1px solid var(--border);
  background: var(--bg2);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
}

.stat-box {
  min-height: 138px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 20px;
  background: var(--bg2);
}

.stat-box strong { color: var(--amber); font-family: 'DM Serif Display', serif; font-size: 30px; font-weight: 400; }
.stat-box span { color: var(--text-dim); font-size: 9px; line-height: 1.65; }

.flow-row {
  display: grid;
  grid-template-columns: 1fr 24px 1fr 24px 1fr 24px 1fr;
  align-items: center;
  gap: 8px;
}

.flow-row + .flow-row { margin-top: 28px; padding-top: 28px; border-top: 1px solid var(--border); }

.flow-label { margin-bottom: 12px; color: var(--text-dim); font-size: 10px; }

.flow-node {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  font-size: 10px;
  text-align: center;
}

.flow-node.highlight { border-color: var(--signal-dim); color: var(--signal); }
.flow-arrow { color: var(--amber-dim); text-align: center; }

.watch-table {
  width: 100%;
  margin-top: 28px;
  border-collapse: collapse;
  font-size: 12px;
}

.watch-table th,
.watch-table td {
  padding: 16px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.watch-table th { color: var(--text-dim); font-weight: 400; }
.watch-table td { color: var(--text-muted); }
.watch-table td:first-child { color: var(--text); }
.risk-text { color: var(--risk); }

.source-list { list-style: none; margin-left: 0 !important; }
.source-list li { padding: 18px 0; border-bottom: 1px solid var(--border); }
.source-list a { color: var(--text); text-decoration-color: var(--amber-dim); text-underline-offset: 3px; }
.source-tier { display: inline-block; min-width: 38px; color: var(--signal); font-size: 10px; }
.source-note { display: block; margin-top: 4px; color: var(--text-dim); font-size: 10px; }

.series-link {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 72px 0;
  padding: 28px 30px;
  border: 1px solid var(--border-strong);
  background: var(--bg2);
  text-decoration: none;
}

.series-link span { color: var(--signal); font-size: 10px; text-transform: uppercase; }
.series-link strong { color: var(--text); font-family: 'DM Serif Display', 'Noto Serif SC', serif; font-size: 24px; font-weight: 400; }
.series-link:hover { border-color: var(--amber-dim); }
.series-link:hover strong { color: var(--amber); }

.feedback-band {
  padding: 70px 0;
  border-top: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
  background: var(--bg2);
}

.feedback-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 70px;
}

.feedback-copy h2 {
  margin-bottom: 16px;
  font-family: 'DM Serif Display', 'Noto Serif SC', serif;
  font-size: 32px;
  font-weight: 400;
}

.feedback-copy p { color: var(--text-muted); font-size: 12px; }

.feedback-form fieldset { border: 0; }
.feedback-form legend { margin-bottom: 12px; color: var(--text-muted); font-size: 11px; }

.feedback-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 18px;
}

.feedback-option {
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
}

.feedback-option:hover { border-color: var(--amber-dim); }
.feedback-option input { accent-color: var(--amber); }

.feedback-form textarea,
.feedback-form input[type="email"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  outline: none;
}

.feedback-form textarea { min-height: 110px; padding: 14px; resize: vertical; }
.feedback-form input[type="email"] { min-height: 44px; margin-top: 10px; padding: 0 14px; }
.feedback-form textarea:focus,
.feedback-form input[type="email"]:focus { border-color: var(--amber-dim); }

.feedback-submit {
  min-height: 44px;
  margin-top: 12px;
  padding: 0 18px;
  border: 1px solid var(--amber-dim);
  border-radius: 2px;
  background: transparent;
  color: var(--amber);
  cursor: pointer;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
}

.feedback-submit:hover { background: var(--amber); color: var(--bg); }
.form-note { margin-top: 10px; color: var(--text-dim); font-size: 9px; }
.thanks-note { display: none; margin-bottom: 18px; color: var(--signal); font-size: 12px; }
.thanks-note.visible { display: block; }

.methodology-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 72px;
}

.methodology-nav {
  position: sticky;
  top: 100px;
  align-self: start;
}

.methodology-nav a {
  display: block;
  padding: 9px 0;
  color: var(--text-dim);
  font-size: 11px;
  text-decoration: none;
}

.methodology-nav a:hover { color: var(--amber); }

.tier-list { margin-top: 24px; }
.tier-item { padding: 22px 0; border-top: 1px solid var(--border); }
.tier-item strong { color: var(--signal); font-size: 11px; }
.tier-item p { margin-top: 8px; color: var(--text-muted); font-size: 12px; }

.site-footer { padding: 40px 0; color: var(--text-dim); font-size: 10px; }
.footer-inner { display: flex; justify-content: space-between; gap: 24px; }
.site-footer a { color: var(--amber-dim); text-decoration: none; }

@media (max-width: 800px) {
  .research-hero { min-height: 500px; }
  .research-hero h1, .article-hero h1 { font-size: 40px; }
  .metric-strip, .signal-grid, .method-grid { grid-template-columns: 1fr; }
  .chain-map { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .metric { border-right: 0; border-bottom: 1px solid var(--border); }
  .metric:last-child { border-bottom: 0; }
  .feature-report, .feedback-grid, .methodology-layout { grid-template-columns: 1fr; }
  .feature-code { min-height: 200px; border-right: 0; border-bottom: 1px solid var(--border-strong); }
  .methodology-nav { position: static; display: flex; flex-wrap: wrap; gap: 0 18px; }
  .flow-row, .stat-grid { grid-template-columns: 1fr; }
  .flow-arrow { transform: rotate(90deg); }
  .watch-table { display: block; overflow-x: auto; }
}

@media (max-width: 560px) {
  .shell, .article-shell { width: min(100% - 32px, 1120px); }
  .nav-actions { gap: 12px; }
  .nav-link.home-label { display: none; }
  .research-hero h1, .article-hero h1 { font-size: 34px; }
  .research-hero::after { font-size: 180px; }
  .section { padding: 64px 0; }
  .section-heading { display: block; }
  .section-heading .text-link { display: inline-block; margin-top: 16px; }
  .feature-body { padding: 30px 24px; }
  .feature-body h3 { font-size: 28px; }
  .feature-code strong { font-size: 58px; }
  .chain-map { grid-template-columns: 1fr; }
  .chain-layer { min-height: 135px; }
  .report-row { grid-template-columns: 42px minmax(0, 1fr) 18px; gap: 12px; }
  .report-title strong { font-size: 20px; }
  .feedback-options { grid-template-columns: 1fr; }
  .feedback-grid { gap: 36px; }
  .footer-inner { display: block; }
  .footer-inner span { display: block; margin-top: 8px; }
}