/* ============================================================
   欧博官网 · ESG Digital Twin 企业可持续发展数字孪生
   视觉语言：Industrial Digital Twin / System Map / Material Flow
   本文件不依赖任何远程资源。
   ============================================================ */

:root {
  --bg: #0b1017;
  --bg-2: #101823;
  --panel: #151f2b;
  --panel-2: #1a2634;
  --line: #273443;
  --line-2: #33435a;
  --grey: #8d99ab;
  --text: #e2e8ef;
  --muted: #a3afbf;
  --esg: #2fd3b5;
  --esg-dim: rgba(47, 211, 181, 0.14);
  --energy: #f2c34d;
  --energy-dim: rgba(242, 195, 77, 0.14);
  --water: #4fa8ff;
  --water-dim: rgba(79, 168, 255, 0.14);
  --carbon: #a597cf;
  --carbon-dim: rgba(165, 151, 207, 0.16);
  --scenario: #ff8f3f;
  --scenario-dim: rgba(255, 143, 63, 0.14);
  --hazard: #ff7373;
  --radius: 10px;
  --radius-lg: 16px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans CJK SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Cascadia Code", "JetBrains Mono", Consolas, "SFMono-Regular", Menlo, monospace;
  --container: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  background: var(--bg);
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  overflow-x: hidden;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--esg); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.35; margin: 0 0 0.6em; font-weight: 700; letter-spacing: 0.01em; }
h1 { font-size: 2rem; }
h2 { font-size: 1.55rem; }
h3 { font-size: 1.18rem; }
h4 { font-size: 1.02rem; }
p { margin: 0 0 1em; }
ul, ol { padding-left: 1.4em; margin: 0 0 1em; }
li { margin-bottom: 0.35em; }
strong { color: #fff; }
code { font-family: var(--mono); font-size: 0.9em; background: var(--panel-2); padding: 0.1em 0.4em; border-radius: 4px; color: var(--energy); }
.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--esg); color: #06110e; padding: 8px 12px; z-index: 999; }
.skip-link:focus { left: 8px; top: 8px; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 16, 23, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 66px; }
.brand { display: flex; align-items: baseline; gap: 10px; color: var(--text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-mark { font-size: 1.45rem; font-weight: 800; letter-spacing: 0.08em; color: #fff; }
.brand-mark::before { content: ""; display: inline-block; width: 12px; height: 12px; margin-right: 8px; border: 2px solid var(--esg); border-radius: 3px; transform: rotate(45deg); vertical-align: 2px; box-shadow: 0 0 0 3px var(--esg-dim); }
.brand-sub { font-size: 0.72rem; color: var(--grey); letter-spacing: 0.12em; text-transform: uppercase; }
.site-nav { display: flex; flex-wrap: wrap; gap: 4px; }
.site-nav a { color: var(--muted); font-size: 0.86rem; padding: 6px 9px; border-radius: 6px; border: 1px solid transparent; white-space: nowrap; }
.site-nav a:hover { color: #fff; background: var(--panel); text-decoration: none; }
body[data-page="index"] .site-nav a.nav-index,
body[data-page="digital-twin"] .site-nav a.nav-digital-twin,
body[data-page="factory"] .site-nav a.nav-factory,
body[data-page="supply-chain"] .site-nav a.nav-supply-chain,
body[data-page="resources"] .site-nav a.nav-resources,
body[data-page="quality"] .site-nav a.nav-quality,
body[data-page="enterprise-ai"] .site-nav a.nav-enterprise-ai,
body[data-page="app"] .site-nav a.nav-app { color: var(--esg); border-color: rgba(47,211,181,0.35); background: var(--esg-dim); }
.nav-toggle { display: none; background: var(--panel); color: var(--text); border: 1px solid var(--line-2); border-radius: 8px; padding: 8px 12px; font-size: 0.9rem; cursor: pointer; font-family: inherit; }

/* ---------- Generic sections ---------- */
.section { padding: 56px 0; border-bottom: 1px solid var(--line); }
.section-tight { padding: 36px 0; }
.section-head { margin-bottom: 26px; }
.eyebrow { display: inline-block; font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--esg); border: 1px solid rgba(47,211,181,0.35); padding: 2px 10px; border-radius: 999px; margin-bottom: 10px; font-family: var(--mono); }
.eyebrow.energy { color: var(--energy); border-color: rgba(242,195,77,0.4); }
.eyebrow.water { color: var(--water); border-color: rgba(79,168,255,0.4); }
.eyebrow.carbon { color: var(--carbon); border-color: rgba(165,151,207,0.45); }
.eyebrow.scenario { color: var(--scenario); border-color: rgba(255,143,63,0.45); }
.lead { font-size: 1.06rem; color: var(--muted); max-width: 900px; }
.grid { display: grid; gap: 18px; }
.grid > *, .cap-map > *, .compare > *, .def-grid > *, .trend-list > *, .feature-list > *, .hero-grid > *, .page-hero-grid > *, .footer-grid > *, .scenario-demo .demo-grid > * { min-width: 0; }
.table-wrap { max-width: 100%; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  position: relative;
}
.card h3 { margin-top: 0; }
.card.accent-esg { border-top: 3px solid var(--esg); }
.card.accent-energy { border-top: 3px solid var(--energy); }
.card.accent-water { border-top: 3px solid var(--water); }
.card.accent-carbon { border-top: 3px solid var(--carbon); }
.card.accent-scenario { border-top: 3px solid var(--scenario); }
.card.accent-grey { border-top: 3px solid var(--grey); }
.card.accent-hazard { border-top: 3px solid var(--hazard); }
.card p:last-child { margin-bottom: 0; }
.small { font-size: 0.88rem; color: var(--muted); }
.mono { font-family: var(--mono); }
.text-right { text-align: right; }

/* ---------- Hero ---------- */
.hero { padding: 56px 0 44px; border-bottom: 1px solid var(--line); background:
  radial-gradient(900px 400px at 85% 10%, rgba(47,211,181,0.10), transparent 60%),
  radial-gradient(600px 300px at 10% 90%, rgba(79,168,255,0.08), transparent 60%);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 36px; align-items: center; }
.hero h1 { font-size: 1.55rem; color: var(--grey); font-weight: 600; margin-bottom: 8px; }
.hero .hero-title { font-size: 2.05rem; color: #fff; line-height: 1.3; margin-bottom: 18px; font-weight: 800; }
.hero .hero-title em { font-style: normal; color: var(--esg); }
.hero-sub { color: var(--muted); font-size: 1.02rem; max-width: 620px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.btn { display: inline-block; padding: 10px 18px; border-radius: 8px; font-size: 0.93rem; border: 1px solid var(--line-2); color: var(--text); background: var(--panel); cursor: pointer; font-family: inherit; }
.btn:hover { text-decoration: none; border-color: var(--esg); color: #fff; }
.btn-primary { background: var(--esg); color: #06110e; border-color: var(--esg); font-weight: 700; }
.btn-primary:hover { color: #06110e; filter: brightness(1.08); }
.hero-visual { position: relative; }
.hero-visual svg { width: 100%; height: auto; opacity: 0.96; }
.twin-layer-bar { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.twin-layer-bar button { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em; padding: 5px 10px; border-radius: 999px; border: 1px solid var(--line-2); background: transparent; color: var(--muted); cursor: pointer; }
.twin-layer-bar button[aria-pressed="true"] { border-color: var(--esg); color: var(--esg); background: var(--esg-dim); }
.twin-layer-bar button[data-layer="energy"][aria-pressed="true"] { border-color: var(--energy); color: var(--energy); background: var(--energy-dim); }
.twin-layer-bar button[data-layer="water"][aria-pressed="true"] { border-color: var(--water); color: var(--water); background: var(--water-dim); }
.twin-layer-bar button[data-layer="carbon"][aria-pressed="true"] { border-color: var(--carbon); color: var(--carbon); background: var(--carbon-dim); }
.twin-layer-bar button[data-layer="material"][aria-pressed="true"] { border-color: var(--scenario); color: var(--scenario); background: var(--scenario-dim); }
.twin-layer-note { font-size: 0.86rem; color: var(--muted); margin-top: 8px; min-height: 2.4em; }
/* inline hero svg layer highlighting */
.hero-visual svg .layer { transition: opacity 0.3s ease; }
.hero-visual svg.has-focus .layer:not(.is-active) { opacity: 0.28; }
.hero-visual svg .layer.is-active .node-box { stroke-width: 2.4; }

/* ---------- Flow / Chain diagrams (HTML, reflow on mobile) ---------- */
.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 8px; margin: 14px 0 18px; padding: 0; list-style: none; }
.flow li { position: relative; flex: 1 1 110px; min-width: 96px; background: var(--panel-2); border: 1px solid var(--line-2); border-radius: 8px; padding: 8px 10px; font-size: 0.84rem; text-align: center; color: var(--text); }
.flow li small { display: block; color: var(--grey); font-size: 0.72rem; font-family: var(--mono); letter-spacing: 0.04em; }
.flow li + li::before { content: "→"; position: absolute; left: -10px; top: 50%; transform: translateY(-50%); color: var(--grey); font-size: 0.8rem; background: var(--bg); padding: 0 1px; }
.flow.vertical { flex-direction: column; }
.flow.vertical li + li::before { content: "↓"; left: 50%; top: -12px; transform: translateX(-50%); }
.flow li.energy { border-color: rgba(242,195,77,0.5); }
.flow li.water { border-color: rgba(79,168,255,0.5); }
.flow li.carbon { border-color: rgba(165,151,207,0.55); }
.flow li.esg { border-color: rgba(47,211,181,0.55); }
.flow li.scenario { border-color: rgba(255,143,63,0.55); }
.flow li.hazard { border-color: rgba(255,115,115,0.55); }

/* ---------- State tags ---------- */
.state { display: inline-block; font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.08em; padding: 2px 8px; border-radius: 4px; border: 1px solid; margin-right: 4px; vertical-align: middle; }
.state.observed { color: var(--esg); border-color: var(--esg); background: var(--esg-dim); }
.state.estimated { color: var(--energy); border-color: var(--energy); background: var(--energy-dim); }
.state.predicted { color: var(--water); border-color: var(--water); background: var(--water-dim); }
.state.simulated { color: var(--scenario); border-color: var(--scenario); background: var(--scenario-dim); }
.state.stale { color: var(--hazard); border-color: var(--hazard); background: rgba(255,115,115,0.12); }
.state-legend { display: flex; flex-wrap: wrap; gap: 10px; margin: 10px 0 0; padding: 0; list-style: none; }
.state-legend li { font-size: 0.86rem; color: var(--muted); }

/* ---------- Articles ---------- */
.article { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 28px 30px; margin-bottom: 22px; }
.article h3 { font-size: 1.28rem; color: #fff; margin-bottom: 8px; }
.article h4 { color: var(--esg); margin-top: 1.4em; font-size: 1rem; }
.article-meta { display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 0.8rem; color: var(--grey); font-family: var(--mono); margin-bottom: 14px; }
.article-meta .cat { color: var(--esg); }
.article-meta .cat.energy { color: var(--energy); }
.article-meta .cat.water { color: var(--water); }
.article-meta .cat.carbon { color: var(--carbon); }
.article-meta .cat.scenario { color: var(--scenario); }
.article-meta .cat.hazard { color: var(--hazard); }
.article .verdict { border-left: 3px solid var(--esg); background: var(--esg-dim); padding: 10px 16px; border-radius: 0 8px 8px 0; margin: 16px 0; color: #fff; }
.article .fail-case { border: 1px dashed rgba(255,115,115,0.55); background: rgba(255,115,115,0.06); padding: 10px 16px; border-radius: 8px; margin: 14px 0; }
.article .fail-case strong { color: var(--hazard); }
.article .more-link { display: inline-block; margin-top: 8px; font-size: 0.92rem; }
.article-list-compact .article { padding: 22px 24px; }
.article-list-compact .article h3 { font-size: 1.1rem; }
.figure { margin: 18px 0; background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; }
.figure img { width: 100%; height: auto; border-radius: 6px; }
.figure figcaption { font-size: 0.84rem; color: var(--muted); margin-top: 10px; line-height: 1.6; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; margin: 14px 0 18px; border: 1px solid var(--line); border-radius: 8px; }
table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 0.9rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--panel-2); color: #fff; font-weight: 600; font-size: 0.84rem; letter-spacing: 0.04em; }
tr:last-child td { border-bottom: none; }

/* ---------- FAQ ---------- */
.faq details { border: 1px solid var(--line); border-radius: 8px; background: var(--panel); margin-bottom: 10px; }
.faq summary { cursor: pointer; padding: 14px 18px; font-weight: 600; color: #fff; list-style: none; position: relative; padding-right: 40px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 16px; top: 12px; color: var(--esg); font-family: var(--mono); font-size: 1.1rem; }
.faq details[open] summary::after { content: "−"; }
.faq .faq-body { padding: 0 18px 16px; color: var(--muted); }
.faq .faq-body p:last-child { margin-bottom: 0; }

/* ---------- Capability map / feature list ---------- */
.cap-map { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.cap-map .card ul { margin: 0; padding-left: 1.2em; font-size: 0.92rem; color: var(--muted); }
.feature-list { counter-reset: feat; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.feature-list li { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 16px 14px; }
.feature-list li::before { counter-increment: feat; content: counter(feat, decimal-leading-zero); font-family: var(--mono); color: var(--esg); font-size: 0.78rem; display: block; margin-bottom: 4px; }
.feature-list h3 { font-size: 1rem; margin-bottom: 4px; }
.feature-list p { font-size: 0.88rem; color: var(--muted); margin: 0; }

/* ---------- Scenario demo ---------- */
.scenario-demo { background: var(--panel); border: 1px solid rgba(255,143,63,0.4); border-radius: var(--radius-lg); padding: 22px 24px; }
.scenario-demo .demo-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 22px; }
.scenario-demo label { display: block; font-size: 0.86rem; color: var(--muted); margin: 10px 0 4px; }
.scenario-demo input[type="range"] { width: 100%; accent-color: var(--scenario); }
.scenario-demo select { width: 100%; background: var(--bg-2); color: var(--text); border: 1px solid var(--line-2); border-radius: 6px; padding: 7px 8px; font-family: inherit; font-size: 0.9rem; }
.scenario-demo .assumption-box { background: var(--bg-2); border: 1px dashed var(--line-2); border-radius: 8px; padding: 10px 14px; font-size: 0.84rem; color: var(--muted); font-family: var(--mono); margin-top: 12px; }
.scenario-demo .result-table { min-width: 300px; }
.scenario-demo .result-table td.num { font-family: var(--mono); text-align: right; }
.scenario-demo .demo-note { font-size: 0.82rem; color: var(--scenario); margin-top: 10px; }
.bar { height: 8px; background: var(--bg-2); border-radius: 4px; overflow: hidden; margin-top: 4px; }
.bar span { display: block; height: 100%; background: var(--scenario); width: 0; transition: width 0.4s ease; }
.bar.energy span { background: var(--energy); }
.bar.carbon span { background: var(--carbon); }
.bar.water span { background: var(--water); }

/* ---------- Trends ---------- */
.trend-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.trend-list .card h3 { font-size: 1.02rem; }
.trend-list .card .idx { font-family: var(--mono); color: var(--scenario); font-size: 0.74rem; letter-spacing: 0.1em; }

/* ---------- Breadcrumb ---------- */
.breadcrumb { font-size: 0.82rem; color: var(--grey); padding: 14px 0 0; font-family: var(--mono); }
.breadcrumb a { color: var(--grey); }
.breadcrumb span::before { content: " / "; color: var(--line-2); }

/* ---------- Page hero (inner pages) ---------- */
.page-hero { padding: 36px 0 34px; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: 1.85rem; color: #fff; }
.page-hero .lead { margin-bottom: 0; }
.page-hero-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 30px; align-items: center; }

/* ---------- Definition blocks ---------- */
.def-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.def-grid .card h3 { font-size: 1.02rem; color: #fff; }
.def-grid .card p { color: var(--muted); font-size: 0.94rem; }
.compare { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.compare .card { padding: 16px 18px; }
.compare .card h4 { margin: 0 0 6px; font-family: var(--mono); font-size: 0.86rem; letter-spacing: 0.06em; }
.compare .card p { font-size: 0.9rem; color: var(--muted); }

/* ---------- Notices ---------- */
.notice { border: 1px solid var(--line-2); background: var(--bg-2); border-radius: 8px; padding: 14px 18px; font-size: 0.88rem; color: var(--muted); }
.notice strong { color: var(--text); }

/* ---------- Footer ---------- */
.site-footer { padding: 40px 0 28px; background: var(--bg-2); border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; }
.footer-grid h4 { color: #fff; font-size: 0.95rem; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 4px; font-size: 0.88rem; }
.footer-grid a { color: var(--muted); }
.footer-disclaimer { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 0.8rem; color: var(--grey); line-height: 1.7; }
.footer-bottom { margin-top: 14px; font-size: 0.82rem; color: var(--grey); display: flex; flex-wrap: wrap; gap: 8px 22px; font-family: var(--mono); }
.footer-bottom a { color: var(--grey); }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .site-nav a { font-size: 0.8rem; padding: 5px 7px; }
}
@media (max-width: 1024px) {
  .grid-4, .feature-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cap-map, .compare, .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero .hero-title { font-size: 1.75rem; }
}
@media (max-width: 900px) {
  .nav-toggle { display: inline-block; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 66px; flex-direction: column; background: var(--bg-2); border-bottom: 1px solid var(--line); padding: 10px 16px 14px; gap: 2px; }
  .site-nav.open { display: flex; }
  .site-nav a { font-size: 0.95rem; padding: 10px 8px; }
  .hero-grid, .page-hero-grid, .scenario-demo .demo-grid { grid-template-columns: 1fr; }
  .flow { flex-direction: column; }
  .flow li + li::before { content: "↓"; left: 50%; top: -12px; transform: translateX(-50%); }
}
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4, .cap-map, .compare, .def-grid, .trend-list, .feature-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 40px 0; }
  .article { padding: 20px 18px; }
  .hero { padding: 36px 0 30px; }
  .hero .hero-title { font-size: 1.5rem; }
  h1 { font-size: 1.55rem; }
  h2 { font-size: 1.32rem; }
  .page-hero h1 { font-size: 1.5rem; }
}
@media (max-width: 430px) {
  body { font-size: 15px; }
  .container { padding: 0 14px; }
  .article { padding: 18px 14px; }
  .hero .hero-title { font-size: 1.35rem; }
  .brand-sub { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-visual svg .layer, .bar span { transition: none; }
}