/* =============================================================
   Meridian Special District — 一座可信的未来之城
   Design system: "Light rising over a trusted city"
   Midnight navy base · warm dawn horizon · meridian grid ·
   year-ring memory motif · civic serif display.
   Shared by /zh-cn/ and /en/. Language content stays separate.
   ============================================================= */

:root {
  /* Surfaces */
  --bg: #05080f;
  --bg-2: #070e1b;
  --bg-3: #0a1426;
  --panel: rgba(13, 21, 38, 0.62);
  --panel-2: rgba(16, 26, 46, 0.78);
  --panel-quiet: rgba(9, 15, 27, 0.55);
  --glass-line: rgba(231, 210, 150, 0.16);

  /* Lines */
  --line: rgba(168, 188, 220, 0.14);
  --line-soft: rgba(168, 188, 220, 0.09);
  --line-gold: rgba(227, 189, 99, 0.40);

  /* Accents */
  --gold: #e3bd63;
  --gold-bright: #f7e6ac;
  --gold-deep: #c69a3e;
  --cyan: #5fe3d6;
  --cyan-soft: #9af0e6;
  --warm: #ffdf9e;
  --warm-ink: #fff7e0;

  /* Ink */
  --ink: #f5f8fc;
  --muted: #c8d2e2;
  --subtle: #8a9ab2;
  --faint: #6c7b92;

  /* System */
  --shadow: 0 30px 80px -40px rgba(0, 0, 0, 0.9);
  --shadow-soft: 0 18px 50px -34px rgba(0, 0, 0, 0.8);
  --radius: 14px;
  --radius-sm: 10px;
  --max: 1300px;
  --gutter: clamp(20px, 5vw, 64px);

  --font-cjk-serif: "Noto Serif SC", "Songti SC", "STSong", "Source Han Serif SC", serif;
  --font-cjk-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Cormorant Garamond", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.66;
  letter-spacing: 0.005em;
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.zh { font-family: var(--font-cjk-sans); line-height: 1.85; }

/* Fixed atmospheric backdrop — the city sky + faint district plan */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(120% 90% at 50% -16%, #0c1730 0%, rgba(12, 23, 48, 0) 52%),
    radial-gradient(90% 60% at 84% 8%, rgba(95, 227, 214, 0.07), transparent 46%),
    linear-gradient(180deg, #05080f 0%, #070e1b 58%, #05080f 100%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(168, 188, 220, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 188, 220, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 75% at 50% 0%, rgba(0,0,0,0.6), transparent 70%);
  mask-image: radial-gradient(120% 75% at 50% 0%, rgba(0,0,0,0.6), transparent 70%);
  opacity: 0.5;
}

img { max-width: 100%; display: block; }

::selection { background: rgba(227, 189, 99, 0.28); color: #fff; }

a { color: var(--gold-bright); text-decoration: none; }
a:hover { color: var(--warm); }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Headings ---------- */
h1, h2, h3 { font-family: var(--font-serif); font-weight: 600; line-height: 1.12; margin: 0; }
body.zh h1, body.zh h2, body.zh h3 { font-family: var(--font-cjk-serif); font-weight: 700; line-height: 1.32; letter-spacing: 0.01em; }

/* ---------- Reveal (progressive enhancement) ---------- */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.8s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.8s cubic-bezier(0.22, 0.61, 0.36, 1); will-change: opacity, transform; }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1 !important; transform: none !important; transition: none; }
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -52px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--gold);
  color: #1a1305;
  font-weight: 600;
  border-radius: 8px;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 14px; }

/* =============================================================
   Header
   ============================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
}
.site-header.is-stuck {
  background: rgba(6, 10, 19, 0.82);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom-color: var(--line);
}
.topbar {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px var(--gutter);
  display: flex;
  align-items: center;
  gap: 22px;
}
.brand { display: flex; align-items: center; gap: 14px; color: var(--ink); }
.brand-logo { width: 42px; height: 42px; border-radius: 9px; object-fit: cover; box-shadow: 0 0 0 1px var(--glass-line), 0 8px 24px -12px rgba(0,0,0,0.8); }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-family: var(--font-cjk-serif); font-weight: 700; font-size: 1.16rem; letter-spacing: 0.06em; }
body:not(.zh) .brand-name { font-family: var(--font-serif); font-weight: 600; letter-spacing: 0.02em; }
.brand-subtitle { font-size: 0.7rem; color: var(--subtle); letter-spacing: 0.16em; text-transform: uppercase; font-family: var(--font-mono); }
body.zh .brand-subtitle { font-family: var(--font-cjk-sans); letter-spacing: 0.24em; text-transform: none; }

.site-nav { margin-left: auto; display: flex; gap: 4px; align-items: center; }
.site-nav a {
  position: relative;
  padding: 8px 12px;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  border-radius: 7px;
  transition: color 0.2s ease, background 0.2s ease;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 4px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after,
.site-nav a.is-active::after { transform: scaleX(1); }
.site-nav a.is-active { color: var(--gold-bright); }

.language-link {
  margin-left: 8px;
  padding: 8px 16px;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--ink);
  border: 1px solid var(--line-gold);
  border-radius: 999px;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.language-link:hover { background: rgba(227, 189, 99, 0.12); border-color: var(--gold); color: var(--gold-bright); }

.menu-button { display: none; flex-direction: column; gap: 5px; width: 44px; height: 40px; padding: 10px; background: transparent; border: 1px solid var(--line); border-radius: 9px; cursor: pointer; }
.menu-button span { display: block; height: 2px; background: var(--ink); border-radius: 2px; transition: transform 0.25s ease, opacity 0.25s ease; }
.menu-button[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-button[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-button[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =============================================================
   Briefing strip (status ticker)
   ============================================================= */
.briefing-strip {
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(90deg, rgba(227, 189, 99, 0.05), rgba(95, 227, 214, 0.04));
  overflow: hidden;
}
.briefing-track {
  display: flex;
  gap: 18px;
  align-items: center;
  max-width: var(--max);
  margin: 0 auto;
  padding: 10px var(--gutter);
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}
.briefing-track::-webkit-scrollbar { display: none; }
.briefing-track span:not(.strip-label) { color: var(--subtle); }
.briefing-track strong { color: var(--ink); font-weight: 500; }
.strip-label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #1a1305;
  background: var(--gold);
  padding: 3px 10px;
  border-radius: 5px;
}
body.zh .strip-label { font-family: var(--font-cjk-sans); letter-spacing: 0.16em; }

/* =============================================================
   Shared section scaffolding
   ============================================================= */
.section-band { position: relative; padding: clamp(70px, 9vw, 130px) 0; }
.section-band.alt::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10, 17, 32, 0.55), rgba(7, 12, 22, 0.2));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  z-index: -1;
}
.section-inner { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 22px;
}
body.zh .eyebrow { font-family: var(--font-cjk-sans); letter-spacing: 0.3em; text-transform: none; font-size: 0.78rem; }
.eyebrow::before { content: ""; width: 26px; height: 1px; background: linear-gradient(90deg, var(--gold), transparent); }

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(24px, 5vw, 70px);
  align-items: end;
  margin-bottom: clamp(40px, 5vw, 64px);
}
.section-heading h2 { font-size: clamp(1.9rem, 3.6vw, 3rem); }
body.zh .section-heading h2 { font-size: clamp(1.7rem, 3.3vw, 2.7rem); }
.section-copy { color: var(--muted); font-size: 1.02rem; margin: 0; }
.section-note {
  margin-top: clamp(28px, 4vw, 44px);
  padding: 20px 26px;
  border-left: 2px solid var(--gold);
  background: rgba(227, 189, 99, 0.05);
  color: var(--muted);
  font-size: 0.96rem;
  border-radius: 0 10px 10px 0;
}

/* Generic card depth shared by most panels */
.city-card, .definition-card, .audience-card, .boundary-panel,
.loop-card, .memory-card, .journey-card, .assurance-item,
.responsibility-card, .roadmap-card, .review-card, .faq-item,
.institutional-strip article {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.03), transparent 60%),
    var(--panel);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: transform 0.4s cubic-bezier(0.22, 0.61, 0.36, 1), border-color 0.4s ease, box-shadow 0.4s ease;
}
.city-card:hover, .definition-card:hover, .audience-card:hover,
.loop-card:hover, .memory-card:hover, .journey-card:hover,
.assurance-item:hover, .responsibility-card:hover, .roadmap-card:hover,
.review-card:hover, .faq-item:hover {
  transform: translateY(-5px);
  border-color: var(--line-gold);
  box-shadow: var(--shadow-soft);
}

/* small label used widely */
.definition-card small, .audience-card small, .city-card small,
.loop-card small, .memory-card small, .journey-card small,
.assurance-item small, .responsibility-card small, .roadmap-card small,
.review-card small, .faq-item small, .boundary-panel small,
.ledger-panel small, .stack-intro small, .belief-panel small,
.institutional-strip small {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 12px;
}
body.zh .definition-card small, body.zh .audience-card small, body.zh .city-card small,
body.zh .loop-card small, body.zh .memory-card small, body.zh .journey-card small,
body.zh .assurance-item small, body.zh .responsibility-card small, body.zh .roadmap-card small,
body.zh .review-card small, body.zh .faq-item small, body.zh .boundary-panel small,
body.zh .ledger-panel small, body.zh .stack-intro small, body.zh .belief-panel small,
body.zh .institutional-strip small { font-family: var(--font-cjk-sans); letter-spacing: 0.16em; text-transform: none; }

/* =============================================================
   Hero — the luminous horizon
   ============================================================= */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(70px, 11vw, 150px) 0 clamp(80px, 10vw, 140px);
}
/* warm dawn + cool sky glow */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(110% 78% at 50% 122%, rgba(227, 189, 99, 0.34), rgba(227, 189, 99, 0.07) 30%, transparent 56%),
    radial-gradient(80% 60% at 50% 118%, rgba(255, 223, 158, 0.22), transparent 52%),
    radial-gradient(70% 50% at 78% -6%, rgba(95, 227, 214, 0.12), transparent 55%);
}
/* receding meridian floor grid -> horizon */
.hero::after {
  content: "";
  position: absolute;
  left: -20%; right: -20%; bottom: 0;
  height: 60%;
  z-index: -1;
  background-image:
    linear-gradient(rgba(227, 189, 99, 0.30) 1px, transparent 1px),
    linear-gradient(90deg, rgba(227, 189, 99, 0.18) 1px, transparent 1px);
  background-size: 70px 70px;
  transform: perspective(440px) rotateX(66deg);
  transform-origin: bottom center;
  -webkit-mask-image: linear-gradient(to top, rgba(0,0,0,0.9), transparent 80%);
  mask-image: linear-gradient(to top, rgba(0,0,0,0.9), transparent 80%);
  opacity: 0.5;
}
.hero-inner {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  gap: clamp(36px, 5vw, 76px);
  align-items: center;
}

.notice {
  display: inline-block;
  max-width: 40ch;
  padding: 12px 18px;
  margin-bottom: 30px;
  font-size: 0.92rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  border-radius: 0 10px 10px 0;
  background: rgba(13, 21, 38, 0.5);
}
.notice strong { color: var(--gold-bright); font-weight: 600; }

.hero-title {
  font-family: var(--font-cjk-serif);
  font-weight: 900;
  font-size: clamp(4rem, 12vw, 8.2rem);
  line-height: 0.98;
  letter-spacing: 0.04em;
  margin: 0 0 28px;
  background: linear-gradient(180deg, #ffffff 0%, #fdf3d6 52%, var(--gold) 130%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 60px rgba(227, 189, 99, 0.16);
}
.hero-title em { font-style: normal; display: inline-block; color: var(--gold); -webkit-text-fill-color: var(--gold); }
body:not(.zh) .hero-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(3rem, 8.5vw, 6.4rem);
  line-height: 1.02;
  letter-spacing: 0.005em;
}
body:not(.zh) .hero-title em { font-style: italic; -webkit-text-fill-color: var(--gold); }

.hero-copy { font-size: clamp(1.05rem, 1.5vw, 1.3rem); color: var(--ink); max-width: 44ch; margin: 0 0 20px; }
.hero-soft-line { color: var(--subtle); font-size: 1rem; max-width: 46ch; margin: 0 0 32px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 34px; }

.button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 999px;
  border: 1px solid var(--line-gold);
  background: rgba(13, 21, 38, 0.5);
  color: var(--ink);
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.button:hover { transform: translateY(-2px); border-color: var(--gold); color: var(--gold-bright); }
.button.primary {
  background: linear-gradient(120deg, var(--gold), var(--gold-deep));
  color: #1a1305;
  border-color: transparent;
  font-weight: 600;
  box-shadow: 0 14px 36px -16px rgba(227, 189, 99, 0.7);
}
.button.primary:hover { color: #120c02; box-shadow: 0 18px 44px -14px rgba(227, 189, 99, 0.85); }

.next-step {
  max-width: 52ch;
  padding: 18px 22px;
  border: 1px dashed var(--line-gold);
  border-radius: 12px;
  font-size: 0.9rem;
  color: var(--subtle);
  line-height: 1.7;
  background: rgba(95, 227, 214, 0.03);
}
.next-step a { font-weight: 600; }

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.hero-metrics div { display: flex; flex-direction: column; gap: 4px; }
.hero-metrics strong {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.4vw, 2.9rem);
  font-weight: 600;
  color: var(--gold-bright);
  line-height: 1;
}
.hero-metrics span { font-size: 0.76rem; color: var(--subtle); letter-spacing: 0.04em; }

/* Review packet — the city charter card */
.review-packet {
  position: relative;
  padding: clamp(28px, 3vw, 40px);
  border: 1px solid var(--glass-line);
  border-radius: 18px;
  background:
    linear-gradient(165deg, rgba(227, 189, 99, 0.08), transparent 55%),
    var(--panel-2);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.review-packet::before {
  content: "";
  position: absolute;
  top: -40%; right: -30%;
  width: 70%; height: 80%;
  background: radial-gradient(circle, rgba(95, 227, 214, 0.12), transparent 70%);
  pointer-events: none;
}
.packet-logo { position: absolute; top: 26px; right: 26px; width: 40px; height: 40px; border-radius: 9px; opacity: 0.7; }
.packet-kicker { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.24em; text-transform: uppercase; color: var(--cyan); margin-bottom: 16px; }
body.zh .packet-kicker { font-family: var(--font-cjk-sans); letter-spacing: 0.2em; text-transform: none; }
.review-packet h2 { font-size: clamp(1.15rem, 1.7vw, 1.5rem); line-height: 1.5; color: var(--ink); }
.review-packet .rule { height: 1px; margin: 22px 0; background: linear-gradient(90deg, var(--gold), transparent); }
.packet-list { display: flex; flex-direction: column; gap: 18px; }
.packet-item { display: grid; grid-template-columns: auto 1fr; gap: 16px; align-items: start; }
.item-index { font-family: var(--font-mono); font-size: 0.8rem; color: var(--gold); padding-top: 2px; }
.packet-item small { display: block; font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--faint); margin-bottom: 4px; }
body.zh .packet-item small { font-family: var(--font-cjk-sans); letter-spacing: 0.16em; text-transform: none; color: var(--cyan); }
.packet-item strong { display: block; color: var(--ink); font-weight: 600; font-size: 0.96rem; margin-bottom: 4px; }
.packet-item p { margin: 0; font-size: 0.85rem; color: var(--subtle); line-height: 1.6; }

/* =============================================================
   City narrative section
   ============================================================= */
.city-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(36px, 5vw, 72px); align-items: start; }
.city-narrative h2 { font-size: clamp(2rem, 4vw, 3.3rem); margin-bottom: 24px; }
.city-narrative p { color: var(--muted); margin: 0 0 18px; }
.city-verse {
  margin-top: 28px;
  padding: 24px 28px;
  font-family: var(--font-cjk-serif);
  font-size: 1.12rem;
  line-height: 1.9;
  color: var(--warm-ink);
  border: 1px solid var(--line-gold);
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(227, 189, 99, 0.08), transparent);
}
body:not(.zh) .city-verse { font-family: var(--font-serif); font-style: italic; font-size: 1.3rem; }

.city-card-grid { display: flex; flex-direction: column; gap: 18px; }
.city-card { padding: 26px 28px; }
.city-card h3 { font-size: 1.2rem; margin-bottom: 10px; color: var(--ink); }
.city-card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.belief-panel {
  margin-top: clamp(40px, 5vw, 64px);
  text-align: center;
  max-width: 880px;
}
.belief-panel small {
  justify-content: center;
  text-align: center;
  color: var(--gold);
  margin-bottom: 16px;
}
.belief-panel p {
  font-family: var(--font-cjk-serif);
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
}
body:not(.zh) .belief-panel p { font-family: var(--font-serif); font-style: italic; }

/* =============================================================
   Model / definitions
   ============================================================= */
.warm-prose { max-width: 78ch; margin: 0 0 clamp(34px, 4vw, 52px); }
.warm-prose p { color: var(--muted); font-size: 1.02rem; margin: 0 0 14px; }

.definition-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.definition-card { padding: 28px 24px; display: flex; flex-direction: column; }
.definition-card h3 { font-size: 1.3rem; margin-bottom: 12px; color: var(--ink); }
.definition-card p { margin: 0 0 16px; color: var(--muted); font-size: 0.93rem; flex: 1; }
.not {
  font-size: 0.82rem;
  color: var(--subtle);
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(255, 120, 120, 0.06);
  border: 1px solid rgba(255, 140, 140, 0.16);
}
.not::before { content: "\2715  "; color: #ff9b9b; font-weight: 700; }

.stack-intro { max-width: 70ch; margin: clamp(44px, 5vw, 64px) 0 26px; }
.stack-intro p { margin: 0; color: var(--muted); font-size: 1rem; }

.institutional-strip { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.institutional-strip article { padding: 22px 18px; }
.institutional-strip strong { display: block; color: var(--ink); font-weight: 500; font-size: 0.92rem; line-height: 1.5; }

/* =============================================================
   Audience grid
   ============================================================= */
.audience-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.audience-card { padding: 28px 26px; }
.audience-card h3 { font-size: 1.18rem; margin-bottom: 12px; color: var(--ink); }
.audience-card p { margin: 0; color: var(--muted); font-size: 0.94rem; }

/* =============================================================
   Boundaries
   ============================================================= */
.boundary-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.boundary-panel { padding: 30px 30px; }
.boundary-panel h3 { font-size: 1.35rem; margin-bottom: 18px; color: var(--ink); }
.boundary-panel ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 13px; }
.boundary-panel li { position: relative; padding-left: 26px; color: var(--muted); font-size: 0.95rem; }
.boundary-panel li::before { content: ""; position: absolute; left: 4px; top: 9px; width: 8px; height: 8px; border-radius: 2px; transform: rotate(45deg); }
.boundary-panel:first-child li::before { background: var(--cyan); box-shadow: 0 0 10px rgba(95, 227, 214, 0.5); }
.boundary-panel:last-child li::before { background: #ff9b9b; box-shadow: 0 0 10px rgba(255, 130, 130, 0.4); }

/* =============================================================
   Operations loop
   ============================================================= */
.loop-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.loop-card { padding: 24px 20px; }
.loop-card small { font-family: var(--font-mono); font-size: 1rem; color: var(--gold); letter-spacing: 0; }
.loop-card h3 { font-size: 1.06rem; margin: 8px 0 10px; color: var(--ink); }
.loop-card p { margin: 0; font-size: 0.86rem; color: var(--muted); }

.ledger-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 22px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(95, 227, 214, 0.05), transparent 60%), var(--panel-quiet);
}
.ledger-panel p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* =============================================================
   Memory section — the year-ring motif
   ============================================================= */
.memory-section { overflow: hidden; }
.memory-section::before {
  content: "";
  position: absolute;
  top: 50%; right: -10%;
  width: 720px; height: 720px;
  transform: translateY(-50%);
  z-index: -1;
  background: repeating-radial-gradient(circle at center, transparent 0 38px, rgba(227, 189, 99, 0.10) 38px 39px);
  -webkit-mask-image: radial-gradient(circle at center, black, transparent 68%);
  mask-image: radial-gradient(circle at center, black, transparent 68%);
  opacity: 0.7;
}
.memory-layout { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.memory-card { padding: 26px 22px; }
.memory-card small { color: var(--gold); font-family: var(--font-mono); font-size: 0.95rem; letter-spacing: 0; }
.memory-card h3 { font-size: 1.1rem; margin: 8px 0 10px; color: var(--ink); }
.memory-card p { margin: 0; font-size: 0.88rem; color: var(--muted); }

.memory-spine {
  margin-top: clamp(38px, 4vw, 56px);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.memory-spine strong {
  font-family: var(--font-cjk-serif);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.5vw, 2rem);
  line-height: 1.6;
  color: var(--gold-bright);
}
.memory-spine span { color: var(--muted); font-size: 1.05rem; }
body:not(.zh) .memory-spine strong { font-family: var(--font-serif); font-style: italic; }

/* =============================================================
   Identity / system layout
   ============================================================= */
.system-layout { display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr); gap: clamp(34px, 5vw, 64px); align-items: center; margin-bottom: clamp(40px, 5vw, 60px); }
.system-layout h2 { font-size: clamp(1.9rem, 3.4vw, 2.8rem); margin-bottom: 20px; }
.system-visual {
  margin: 0;
  padding: 18px;
  border: 1px solid var(--glass-line);
  border-radius: 16px;
  background: linear-gradient(160deg, rgba(95, 227, 214, 0.06), transparent 60%), var(--panel-quiet);
  box-shadow: var(--shadow);
}
.system-visual img { border-radius: 10px; }

.journey-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.journey-card { padding: 32px 32px; }
.journey-card h3 { font-size: 1.4rem; margin-bottom: 18px; color: var(--ink); }
.journey-card ol { margin: 0; padding: 0; list-style: none; counter-reset: step; display: flex; flex-direction: column; gap: 14px; }
.journey-card li { position: relative; padding-left: 40px; color: var(--muted); font-size: 0.96rem; counter-increment: step; }
.journey-card li::before {
  content: counter(step);
  position: absolute; left: 0; top: -1px;
  width: 26px; height: 26px;
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gold-bright);
  border: 1px solid var(--line-gold);
  border-radius: 50%;
  background: rgba(227, 189, 99, 0.06);
}

/* =============================================================
   Assurance
   ============================================================= */
.assurance-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.assurance-item { padding: 30px 28px; }
.assurance-item h3 { font-size: 1.25rem; margin-bottom: 12px; color: var(--ink); }
.assurance-item p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.responsibility-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-top: 26px; }
.responsibility-card { padding: 22px 18px; }
.responsibility-card h3 { font-size: 1.05rem; margin: 6px 0 8px; color: var(--ink); }
.responsibility-card p { margin: 0; font-size: 0.84rem; color: var(--muted); }

/* =============================================================
   Pilot roadmap
   ============================================================= */
.roadmap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; position: relative; }
.roadmap::before {
  content: "";
  position: absolute;
  top: 38px; left: 6%; right: 6%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-gold) 14%, var(--line-gold) 86%, transparent);
  z-index: 0;
}
.roadmap-card { padding: 30px 26px; position: relative; }
.roadmap-card::before {
  content: "";
  position: absolute;
  top: -7px; left: 28px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(227, 189, 99, 0.18), 0 0 14px rgba(227, 189, 99, 0.6);
}
.roadmap-card h3 { font-size: 1.2rem; margin: 14px 0 12px; color: var(--ink); }
.roadmap-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

/* =============================================================
   Review materials
   ============================================================= */
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.review-card { padding: 28px 26px; }
.review-card small { color: var(--gold); font-family: var(--font-mono); font-size: 0.95rem; letter-spacing: 0; }
.review-card h3 { font-size: 1.16rem; margin: 8px 0 12px; color: var(--ink); }
.review-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

/* =============================================================
   FAQ
   ============================================================= */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.faq-item { padding: 26px 28px; }
.faq-item h3 { font-size: 1.15rem; margin: 6px 0 12px; color: var(--ink); }
.faq-item p { margin: 0; color: var(--muted); font-size: 0.94rem; }

/* =============================================================
   Closing CTA
   ============================================================= */
.closing-cta {
  position: relative;
  overflow: hidden;
  padding: clamp(80px, 10vw, 150px) 0;
}
.closing-cta::before {
  content: "";
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(90% 120% at 50% 130%, rgba(227, 189, 99, 0.22), transparent 55%),
    radial-gradient(60% 90% at 50% -20%, rgba(95, 227, 214, 0.1), transparent 60%);
  border-top: 1px solid var(--line-soft);
}
.closing-layout { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); gap: clamp(30px, 5vw, 64px); align-items: center; }
.closing-cta h2 { font-size: clamp(2.2rem, 4.6vw, 3.6rem); margin-bottom: 22px; }
.closing-cta p { color: var(--muted); font-size: 1.08rem; margin: 0; max-width: 54ch; }
.closing-actions { display: flex; flex-direction: column; gap: 14px; align-items: flex-start; }
.closing-actions .button { width: 100%; justify-content: center; }

/* =============================================================
   Footer
   ============================================================= */
.site-footer { border-top: 1px solid var(--line); background: rgba(5, 8, 15, 0.7); }
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 32px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  color: var(--subtle);
  font-size: 0.86rem;
}
.footer-inner span:first-child { color: var(--ink); font-family: var(--font-cjk-serif); letter-spacing: 0.06em; }
body:not(.zh) .footer-inner span:first-child { font-family: var(--font-serif); }

/* =============================================================
   Responsive
   ============================================================= */
@media (max-width: 1080px) {
  .definition-grid, .institutional-strip, .loop-grid, .memory-layout, .responsibility-grid { grid-template-columns: repeat(2, 1fr); }
  .roadmap { grid-template-columns: repeat(2, 1fr); }
  .roadmap::before { display: none; }
  .audience-grid, .assurance-grid, .review-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 920px) {
  .site-nav {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(320px, 84vw);
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 100px 24px 40px;
    margin: 0;
    background: rgba(7, 12, 22, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid var(--line);
    transform: translateX(105%);
    transition: transform 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  }
  .site-nav[data-open] { transform: translateX(0); }
  .site-nav a { padding: 13px 14px; font-size: 1rem; }
  .menu-button { display: flex; margin-left: auto; }
  .language-link { display: none; }
  .hero-inner, .city-layout, .system-layout, .closing-layout, .section-heading { grid-template-columns: 1fr; }
  .hero-inner { gap: 44px; }
  .section-heading { gap: 16px; align-items: start; }
  .review-packet { order: 2; }
}

@media (max-width: 720px) {
  .definition-grid, .institutional-strip, .loop-grid, .memory-layout,
  .responsibility-grid, .roadmap, .audience-grid, .assurance-grid,
  .review-grid, .faq-grid, .boundary-layout, .ledger-panel, .journey-grid { grid-template-columns: 1fr; }
  .hero-metrics { grid-template-columns: repeat(2, 1fr); gap: 20px 14px; }
  .closing-actions { width: 100%; }
}

@media (max-width: 420px) {
  :root { --gutter: 18px; }
  .hero-title { font-size: clamp(3.2rem, 18vw, 4.6rem); }
}