/* =================================================================
   AgentFlow / GovPulse / 明察 — Brand Token System v2
   Light-first, with optional dark theme.
   Prussian blue + Amber gold. Plus Jakarta Sans + Inter.
   ================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@500;600;700;800&family=Inter:wght@300;400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&family=Noto+Sans+TC:wght@400;500;700;900&family=ZCOOL+XiaoWei&display=swap');

/* ── PRIMITIVES (theme-invariant) ──────────────────────────────── */
:root {
  /* Prussian blue scale */
  --prussian-950: #030814;
  --prussian-900: #061538;
  --prussian-800: #0B2447;   /* CORE brand navy */
  --prussian-700: #15315E;
  --prussian-600: #1F3F75;
  --prussian-500: #2D5092;
  --prussian-400: #4A6BA8;
  --prussian-300: #6D86B5;
  --prussian-200: #93A6C8;
  --prussian-100: #C2CEE0;
  --prussian-50:  #E2E8F2;

  /* Amber gold scale */
  --amber-900: #6E5C26;
  --amber-800: #8C7530;
  --amber-700: #B0913C;
  --amber-600: #C9A84C;     /* CORE accent */
  --amber-500: #D6B968;
  --amber-400: #E3CD90;
  --amber-300: #EFDCB3;
  --amber-200: #F6E9CE;
  --amber-100: #FBF4E3;

  /* Paper / off-whites */
  --paper-0: #FFFFFF;
  --paper-1: #FAF7F0;
  --paper-2: #F6F2E8;       /* CORE cream */
  --paper-3: #EEE9DC;
  --paper-4: #E3DCC8;

  /* Signal */
  --pos:  #1F8A5B;
  --neg:  #C8412B;
  --warn: #D99025;
  --info: #2E6FB5;

  /* Brand-fixed (do not swap by theme) */
  --brand:        var(--prussian-800);
  --brand-accent: var(--amber-600);

  /* Type */
  --font-display: "Plus Jakarta Sans", "Noto Sans TC", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-sans:    "Inter", "Noto Sans TC", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-tc:      "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Scale */
  --t-eyebrow: 11px;
  --t-meta:    12px;
  --t-body:    15px;
  --t-body-lg: 17px;
  --t-h5:      18px;
  --t-h4:      22px;
  --t-h3:      28px;
  --t-h2:      40px;
  --t-h1:      64px;
  --t-hero:    88px;

  /* Spacing */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px;
  --s-9: 96px; --s-10:128px;

  /* Radii (tight) */
  --r-1: 2px; --r-2: 4px; --r-3: 6px; --r-4: 10px;
}

/* ── LIGHT THEME (default) ─────────────────────────────────────── */
:root, [data-theme="light"] {
  --bg:          var(--paper-2);
  --bg-elev:     var(--paper-0);
  --bg-sunken:   var(--paper-3);
  --bg-inverse:  var(--prussian-800);

  --fg:          var(--prussian-800);
  --fg-muted:    rgba(11,36,71,0.68);
  --fg-subtle:   rgba(11,36,71,0.48);
  --fg-faint:    rgba(11,36,71,0.30);
  --fg-inverse:  var(--paper-1);

  --rule:        rgba(11,36,71,0.14);
  --rule-strong: rgba(11,36,71,0.26);
  --rule-soft:   rgba(11,36,71,0.06);

  --accent:        var(--amber-600);
  --accent-hover:  var(--amber-700);
  --accent-text:   var(--amber-800);   /* for amber text on cream */
  --accent-on-bg:  var(--prussian-900); /* what to set on amber surfaces */

  /* shadows */
  --shadow-sm: 0 1px 2px rgba(11,36,71,0.06);
  --shadow-md: 0 8px 24px -8px rgba(11,36,71,0.18);
  --shadow-lg: 0 24px 60px -20px rgba(11,36,71,0.30);

  color-scheme: light;
}

/* ── DARK THEME ───────────────────────────────────────────────── */
[data-theme="dark"] {
  --bg:          var(--prussian-800);
  --bg-elev:     var(--prussian-700);
  --bg-sunken:   var(--prussian-900);
  --bg-inverse:  var(--paper-2);

  --fg:          var(--paper-1);
  --fg-muted:    rgba(250,247,240,0.72);
  --fg-subtle:   rgba(250,247,240,0.50);
  --fg-faint:    rgba(250,247,240,0.30);
  --fg-inverse:  var(--prussian-800);

  --rule:        rgba(255,255,255,0.10);
  --rule-strong: rgba(255,255,255,0.20);
  --rule-soft:   rgba(255,255,255,0.04);

  --accent:       var(--amber-500);
  --accent-hover: var(--amber-400);
  --accent-text:  var(--amber-400);
  --accent-on-bg: var(--prussian-900);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 24px -8px rgba(0,0,0,0.6);
  --shadow-lg: 0 24px 60px -20px rgba(0,0,0,0.7);

  color-scheme: dark;
}

/* ── BASE ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: var(--t-body);
  line-height: 1.55;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.3s ease, color 0.3s ease;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ── TYPE PRIMITIVES ─────────────────────────────────────────── */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--t-eyebrow);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--accent-text);
}
.display {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
}
.display-tc {
  font-family: var(--font-display);   /* Plus Jakarta + Noto Sans TC 900 */
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.15;
}
.mono { font-family: var(--font-mono); }
.tc   { font-family: var(--font-tc); }

/* ── BUTTONS ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.005em;
  border: 1px solid transparent;
  border-radius: var(--r-2);
  transition: background .15s, color .15s, border-color .15s, transform .1s, box-shadow .15s;
  white-space: nowrap;
  cursor: pointer;
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--accent);
  color: var(--accent-on-bg);
  border-color: var(--accent);
}
.btn--primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 8px 20px -8px rgba(201,168,76,0.5);
}

.btn--ink {
  background: var(--bg-inverse);
  color: var(--fg-inverse);
  border-color: var(--bg-inverse);
}
.btn--ink:hover { background: var(--prussian-700); border-color: var(--prussian-700); }

.btn--ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--rule-strong);
}
.btn--ghost:hover { background: var(--rule-soft); border-color: var(--fg); }

.btn .arr { font-family: var(--font-mono); font-weight: 500; }

/* ── NAV ─────────────────────────────────────────────────────── */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 48px;
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 14px;
  position: relative;
  z-index: 5;
}
.nav__brand { display: flex; align-items: center; gap: 10px; }
.nav__links { display: flex; align-items: center; gap: 28px; }
.nav__links a {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--fg-muted);
  transition: color .15s;
}
.nav__links a:hover { color: var(--fg); }
.nav__links a.is-active { color: var(--fg); }
.nav__links a.is-active::after {
  content: '';
  display: block;
  height: 1.5px;
  background: var(--accent);
  margin-top: 4px;
}
.nav__cta { display: flex; align-items: center; gap: 12px; }

/* Theme toggle button */
.theme-toggle {
  width: 36px; height: 36px;
  border: 1px solid var(--rule-strong);
  background: transparent;
  border-radius: var(--r-2);
  display: flex; align-items: center; justify-content: center;
  color: var(--fg-muted);
  transition: background .15s, color .15s, border-color .15s;
  padding: 0;
}
.theme-toggle:hover { color: var(--fg); border-color: var(--fg); background: var(--rule-soft); }
.theme-toggle svg { width: 18px; height: 18px; display: block; }
.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: block; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }

/* Live system dot */
.live-dot {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--fg-muted); letter-spacing: 0.10em;
  text-transform: uppercase;
}
.live-dot::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--pos);
  box-shadow: 0 0 0 3px rgba(31,138,91,0.18);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.78); }
}

/* ── FOOTER (always dark for FT/Bloomberg authority) ─────────── */
.foot {
  background: var(--prussian-800);
  color: rgba(250,247,240,0.85);
  padding: 64px 48px 32px;
  border-top: 4px solid var(--amber-600);
}
[data-theme="dark"] .foot { background: var(--prussian-900); border-top-width: 1px; border-top-color: var(--amber-600); }
.foot__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; }
.foot__col h5 {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--amber-400); margin: 0 0 16px;
  font-weight: 500;
}
.foot__col ul { list-style: none; padding: 0; margin: 0; }
.foot__col li {
  margin-bottom: 10px; font-size: 13px;
  color: rgba(250,247,240,0.65);
  transition: color .15s; cursor: pointer;
}
.foot__col li:hover { color: rgba(250,247,240,0.95); }
.foot__bot {
  display: flex; justify-content: space-between; align-items: center;
  border-top: 1px solid rgba(255,255,255,0.10);
  padding-top: 24px; margin-top: 48px;
  font-family: var(--font-mono); font-size: 11px;
  color: rgba(250,247,240,0.45);
  letter-spacing: 0.08em;
}

/* mono data cells */
.cell-mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* shared section primitives */
.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--rule);
}
.section__head {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  margin-bottom: 56px;
}
.section__head .meta {
  border-top: 1px solid var(--rule);
  padding-top: 16px;
}
.section__head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 48px;
  line-height: 1.1;
  color: var(--fg);
  margin: 0;
  letter-spacing: -0.025em;
}
.section__head h2 + p {
  margin: 20px 0 0;
  font-family: var(--font-tc);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg-muted);
  max-width: 540px;
}

/* shared wrap */
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 48px; }

/* responsive */
@media (max-width: 880px) {
  .wrap { padding: 0 20px; }
  .nav { padding: 14px 20px; }
  .nav__links { display: none; }
  .section { padding: 64px 0; }
  .section__head { grid-template-columns: 1fr; gap: 16px; margin-bottom: 36px; }
  .section__head h2 { font-size: 32px; }
  .foot { padding: 48px 20px 24px; }
  .foot__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .foot__bot { flex-direction: column; gap: 12px; align-items: flex-start; }
}