:root {
  color-scheme: light dark;
  --bg: #eaf1f2;
  --surface: rgba(251, 254, 253, .72);
  --surface-strong: rgba(251, 254, 253, .9);
  --text: #071719;
  --muted: #53676a;
  --line: rgba(7, 23, 25, .14);
  --line-strong: rgba(7, 23, 25, .3);
  --accent: #007c83;
  --accent-soft: rgba(0, 124, 131, .12);
  --warm: #e95f39;
  --grid: rgba(7, 23, 25, .08);
  --shadow: 0 24px 70px rgba(9, 35, 35, .1);
  --radius-card: 22px;
  --radius-panel: 28px;
  --radius-control: 14px;
  --max: 1160px;
}

[data-theme="dark"] {
  --bg: #06100f;
  --surface: rgba(11, 27, 25, .78);
  --surface-strong: rgba(11, 27, 25, .94);
  --text: #e9f8f4;
  --muted: #94aaa6;
  --line: rgba(233, 248, 244, .13);
  --line-strong: rgba(233, 248, 244, .3);
  --accent: #50e2ca;
  --accent-soft: rgba(80, 226, 202, .12);
  --warm: #ff805c;
  --grid: rgba(233, 248, 244, .065);
  --shadow: 0 28px 80px rgba(0, 0, 0, .32);
}

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --bg: #06100f;
    --surface: rgba(11, 27, 25, .78);
    --surface-strong: rgba(11, 27, 25, .94);
    --text: #e9f8f4;
    --muted: #94aaa6;
    --line: rgba(233, 248, 244, .13);
    --line-strong: rgba(233, 248, 244, .3);
    --accent: #50e2ca;
    --accent-soft: rgba(80, 226, 202, .12);
    --warm: #ff805c;
    --grid: rgba(233, 248, 244, .065);
    --shadow: 0 28px 80px rgba(0, 0, 0, .32);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 92px; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 40px 40px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 40px 40px,
    radial-gradient(circle at 82% 2%, var(--accent-soft), transparent 32%),
    var(--bg);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
::selection { color: #fff; background: var(--accent); }
.shell { width: min(calc(100% - 28px), var(--max)); margin-inline: auto; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 74%, transparent);
  -webkit-backdrop-filter: blur(24px) saturate(150%);
  backdrop-filter: blur(24px) saturate(150%);
}
.topbar-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.brand { display: inline-flex; align-items: baseline; gap: 10px; font-weight: 850; letter-spacing: -.02em; }
.brand small { color: var(--muted); font: 720 .72rem/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .12em; }
.top-actions { display: flex; align-items: center; gap: 8px; }
.home-button, .theme-toggle {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  background: var(--surface);
  box-shadow: inset 0 1px 0 color-mix(in srgb, white 62%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  backdrop-filter: blur(18px) saturate(150%);
  font-size: .8rem;
  font-weight: 760;
  cursor: pointer;
}
.home-button:hover, .theme-toggle:hover { border-color: var(--accent); }
.home-button:focus-visible, .theme-toggle:focus-visible, .text-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.hero { padding: 68px 0 44px; }
.eyebrow, .section-label, .mini-label {
  color: var(--warm);
  font: 760 .75rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.hero h1 { max-width: 930px; margin: 16px 0 18px; font-size: clamp(2.5rem, 11vw, 6.6rem); line-height: 1.02; letter-spacing: -.065em; }
.hero .lead { max-width: 780px; margin: 0; color: var(--muted); font-size: clamp(1.05rem, 2.4vw, 1.35rem); }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.chip { padding: 6px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--accent); background: var(--surface); font: 690 .76rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; }

.hero-panel {
  position: relative;
  overflow: hidden;
  margin-top: 34px;
  padding: 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-panel);
  background:
    radial-gradient(circle at 100% 0, var(--accent-soft), transparent 38%),
    var(--surface);
  box-shadow: var(--shadow), inset 0 1px 0 color-mix(in srgb, white 65%, transparent);
  -webkit-backdrop-filter: blur(22px) saturate(150%);
  backdrop-filter: blur(22px) saturate(150%);
}
.hero-panel p { margin: 0; color: var(--muted); }
.stat-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; margin-top: 20px; border: 1px solid var(--line); background: var(--line); }
.stat { min-height: 110px; padding: 16px; background: color-mix(in srgb, var(--surface-strong) 88%, transparent); }
.stat strong { display: block; color: var(--accent); font: 800 clamp(1.25rem, 5vw, 2rem)/1.1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.stat span { display: block; margin-top: 8px; color: var(--muted); font-size: .83rem; line-height: 1.4; }

.project-layout { padding: 34px 0 76px; }
.toc { display: none; }
.content { min-width: 0; }
.project-section { padding: 38px 0; border-top: 1px solid var(--line-strong); }
.section-head { display: grid; gap: 8px; margin-bottom: 24px; }
.project-section h2 { max-width: 760px; margin: 0; font-size: clamp(1.65rem, 6.5vw, 3.35rem); line-height: 1.12; letter-spacing: -.045em; }
.project-section > p, .section-intro { max-width: 760px; color: var(--muted); }
.project-section h3 { margin: 0 0 8px; font-size: 1.05rem; line-height: 1.35; }
.project-section p { margin-top: 0; }

.card-grid { display: grid; gap: 10px; }
.card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: inset 0 1px 0 color-mix(in srgb, white 48%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  backdrop-filter: blur(18px) saturate(140%);
}
.card p { margin-bottom: 0; color: var(--muted); font-size: .95rem; }
.card .mini-label { display: block; margin-bottom: 22px; color: var(--accent); }
.card strong.metric-inline { color: var(--accent); font: 760 1.35rem/1.15 ui-monospace, SFMono-Regular, Menlo, monospace; }

.flow { display: grid; gap: 10px; counter-reset: flow; }
.flow-step { position: relative; padding: 20px 20px 20px 66px; border: 1px solid var(--line); border-radius: var(--radius-card); background: var(--surface); }
.flow-step::before { counter-increment: flow; content: counter(flow, decimal-leading-zero); position: absolute; left: 18px; top: 20px; color: var(--warm); font: 780 .78rem/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.flow-step p { margin: 0; color: var(--muted); }
.flow-step + .flow-step::after { content: ""; position: absolute; left: 32px; top: -11px; width: 1px; height: 11px; background: var(--line-strong); }

.architecture { display: grid; gap: 8px; }
.layer { padding: 20px; border: 1px solid var(--line); background: var(--surface); }
.layer:first-child { border-radius: var(--radius-card) var(--radius-card) 8px 8px; }
.layer:last-child { border-radius: 8px 8px var(--radius-card) var(--radius-card); }
.layer header { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 8px; }
.layer header span { color: var(--warm); font: 720 .72rem/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.layer p { margin: 0; color: var(--muted); }

.compact-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line-strong); }
.compact-list li { display: grid; grid-template-columns: minmax(92px, .32fr) 1fr; gap: 14px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.compact-list strong { font-size: .9rem; }
.compact-list span { color: var(--muted); }

.data-table { width: 100%; border-collapse: collapse; border: 1px solid var(--line); background: var(--surface); }
.data-table th, .data-table td { padding: 13px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.data-table th { color: var(--accent); font-size: .78rem; letter-spacing: .04em; }
.data-table td { color: var(--muted); }
.data-table tr:last-child td { border-bottom: 0; }
.table-scroll { overflow-x: auto; border-radius: var(--radius-card); }

.callout { padding: 22px; border-left: 3px solid var(--accent); background: var(--accent-soft); }
.callout strong { display: block; margin-bottom: 6px; }
.callout p { margin: 0; color: var(--muted); }
.evidence { border-left-color: var(--warm); background: color-mix(in srgb, var(--warm) 10%, transparent); }

.media-grid { display: grid; gap: 12px; margin-top: 18px; }
.project-figure {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: inset 0 1px 0 color-mix(in srgb, white 45%, transparent);
}
.project-figure .media-frame { display: grid; place-items: center; min-height: 210px; padding: 12px; background: color-mix(in srgb, var(--surface-strong) 88%, transparent); }
.project-figure img { display: block; width: 100%; max-height: 620px; object-fit: contain; border-radius: calc(var(--radius-card) - 10px); }
.project-figure figcaption { padding: 12px 14px 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; line-height: 1.45; }
.project-figure figcaption strong { display: block; margin-bottom: 3px; color: var(--text); }
.project-figure.wide { margin-top: 18px; }

.code-window { overflow: hidden; margin-top: 18px; border: 1px solid var(--line); border-radius: var(--radius-card); background: #07100f; box-shadow: var(--shadow); }
.code-window header { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 14px; border-bottom: 1px solid rgba(233, 248, 244, .12); color: #a9c0bb; font: 720 .72rem/1.3 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .06em; }
.code-window header::before { content: "●  ●  ●"; color: #ff805c; letter-spacing: .28em; }
.code-window pre { overflow-x: auto; margin: 0; padding: 18px; color: #dffbf4; font: 560 .78rem/1.65 ui-monospace, SFMono-Regular, Menlo, monospace; tab-size: 2; }
.code-window .kw { color: #8ed8ff; }
.code-window .fn { color: #63f4d7; }
.code-window .num { color: #ffad8f; }
.code-window .cm { color: #78908b; }

.result-band { display: grid; gap: 1px; overflow: hidden; margin-top: 18px; border: 1px solid var(--line); border-radius: var(--radius-card); background: var(--line); }
.result-band > div { min-width: 0; padding: 14px; background: var(--surface); }
.result-band strong { display: block; color: var(--accent); font: 800 1.2rem/1.15 ui-monospace, SFMono-Regular, Menlo, monospace; }
.result-band span { display: block; margin-top: 5px; color: var(--muted); font-size: .8rem; line-height: 1.35; }

.system-map { display: grid; gap: 8px; margin-top: 18px; }
.system-map .node { position: relative; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius-control); background: var(--surface); }
.system-map .node + .node::before { content: "↓"; position: absolute; top: -18px; left: 50%; translate: -50% 0; color: var(--warm); font-weight: 800; }
.system-map .node strong { display: block; color: var(--accent); }
.system-map .node span { display: block; margin-top: 4px; color: var(--muted); font-size: .86rem; }

.icom { display: grid; grid-template-areas: ". control ." "input process output" ". mechanism ."; grid-template-columns: .8fr 1.3fr .8fr; gap: 8px; align-items: stretch; }
.icom > div { min-width: 0; padding: 14px; border: 1px solid var(--line); background: var(--surface); }
.icom strong { display: block; color: var(--accent); font: 760 .72rem/1.3 ui-monospace, SFMono-Regular, Menlo, monospace; }
.icom span { display: block; margin-top: 6px; color: var(--muted); font-size: .78rem; line-height: 1.45; }
.icom .input { grid-area: input; border-radius: var(--radius-card) 8px 8px var(--radius-card); }
.icom .control { grid-area: control; border-radius: var(--radius-card) var(--radius-card) 8px 8px; }
.icom .process { grid-area: process; display: grid; place-items: center; text-align: center; color: var(--text); background: var(--accent-soft); }
.icom .output { grid-area: output; border-radius: 8px var(--radius-card) var(--radius-card) 8px; }
.icom .mechanism { grid-area: mechanism; border-radius: 8px 8px var(--radius-card) var(--radius-card); }

.project-nav { display: grid; gap: 10px; padding: 20px 0 80px; }
.project-nav a { display: block; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-card); background: var(--surface); }
.project-nav small { display: block; color: var(--warm); font: 720 .72rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; }
.project-nav strong { display: block; margin-top: 5px; }
.project-nav a:hover { border-color: var(--accent); }

footer { padding: 24px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: .8rem; }
.footer-inner { display: flex; flex-direction: column; gap: 5px; }
.footer-inner a { color: var(--accent); font-weight: 740; }

@media (max-width: 560px) {
  .brand small { display: none; }
  .home-button { width: 42px; padding: 0; font-size: 0; }
  .home-button::before { content: "←"; font-size: 1rem; }
  .icom { grid-template-areas: "control" "input" "process" "output" "mechanism"; grid-template-columns: 1fr; }
  .icom > div { border-radius: var(--radius-control) !important; }
}

@media (min-width: 700px) {
  .hero { padding-top: 86px; }
  .hero-panel { padding: 30px; }
  .stat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .card-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card-grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .media-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .media-grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .result-band { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .system-map { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .system-map .node + .node::before { content: "→"; top: 50%; left: -9px; translate: 0 -50%; }
  .flow-step + .flow-step::after { display: none; }
  .project-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-inner { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 980px) {
  .hero { padding: 110px 0 60px; }
  .project-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 64px; align-items: start; }
  .toc { position: sticky; top: 102px; display: block; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-card); background: var(--surface); }
  .toc span { display: block; margin-bottom: 12px; color: var(--warm); font: 760 .72rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; }
  .toc a { display: block; padding: 8px 0; color: var(--muted); font-size: .82rem; border-bottom: 1px solid var(--line); }
  .toc a:last-child { border-bottom: 0; }
  .toc a:hover { color: var(--accent); }
  .project-section { padding: 54px 0; }
  .section-head { grid-template-columns: 118px 1fr; align-items: start; gap: 24px; }
  .section-label { padding-top: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

@media (prefers-reduced-transparency: reduce) {
  .topbar, .home-button, .theme-toggle, .hero-panel, .card, .toc { background: var(--surface-strong); -webkit-backdrop-filter: none; backdrop-filter: none; }
}