/* Civilization OS · 文明操作系统
   Canonical Psy brand · cosmic-cyber operating-system aesthetic
   Cabin Condensed (display) · Inter (body) · JetBrains Mono (mono) · Noto Sans SC for Chinese */

:root {
  /* Canonical Psy tokens */
  --bg: #0a0a0c;
  --surface: #0a0a0c;
  --surface-2: #16161a;
  --surface-3: #26262a;
  --border: rgba(250, 250, 250, 0.10);
  --border-strong: rgba(250, 250, 250, 0.22);

  --ink: #fafafa;
  --ink-dim: #a3a3ab;
  --ink-mute: #6e6e78;

  --primary: #61f5b3;
  --primary-soft: rgba(97, 245, 179, 0.12);
  --primary-glow: rgba(97, 245, 179, 0.28);

  /* Module-layer accents (used sparingly to differentiate sections) */
  --cosmos:   #4d7cff;         /* timeline / cosmology */
  --neural:   #9a6bff;         /* consciousness / AI */
  --civic:    #d4a017;         /* civilization / institutions */
  --energy:   #ff7a59;         /* energy */
  --signal:   #5fd9ff;         /* network / internet */
  --crimson:  #c44a4a;         /* warnings / guardrails */

  --cosmos-soft: rgba(77, 124, 255, 0.10);
  --neural-soft: rgba(154, 107, 255, 0.10);
  --civic-soft:  rgba(212, 160, 23, 0.10);
  --energy-soft: rgba(255, 122, 89, 0.10);
  --signal-soft: rgba(95, 217, 255, 0.10);

  --shadow: 0 22px 56px rgba(0, 0, 0, 0.55);
  --radius: 4px;
  --radius-lg: 14px;
  --maxw: 1320px;

  --display: "Cabin Condensed", system-ui, sans-serif;
  --body:    "Inter", "Noto Sans SC", system-ui, sans-serif;
  --mono:    "JetBrains Mono", ui-monospace, monospace;
}

html[data-theme="light"] {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f8f8f8;
  --surface-3: #ebebed;
  --border: rgba(10, 10, 12, 0.13);
  --border-strong: rgba(10, 10, 12, 0.30);
  --ink: #0a0a0c;
  --ink-dim: #4f5260;
  --ink-mute: #777a85;
  --primary: #00b87b;
  --primary-soft: rgba(0, 184, 123, 0.10);
  --primary-glow: rgba(0, 184, 123, 0.20);
  --cosmos: #2c4fcc;
  --neural: #6b3ce0;
  --civic:  #8a6a1f;
  --energy: #c84a26;
  --signal: #1f8fbb;
  --shadow: 0 14px 32px rgba(10, 10, 12, 0.10);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

::selection { background: var(--primary-soft); color: var(--ink); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 32px; }

/* ─── Topbar ─────────────────────────────── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px; height: 68px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--display); font-size: 21px; letter-spacing: 0;
  color: var(--ink); font-weight: 600;
}
.brand-mark {
  width: 30px; height: 30px; flex: 0 0 auto;
  background: var(--primary);
  border-radius: 6px;
  display: grid; place-items: center;
  color: var(--bg);
  box-shadow: 0 0 14px var(--primary-glow);
}
.brand-mark svg { width: 64%; height: 64%; display: block; fill: currentColor; }
.brand small {
  font-family: var(--mono); font-size: 10.5px; color: var(--ink-mute);
  letter-spacing: 0.16em; text-transform: uppercase;
  margin-left: 4px;
}
.nav { display: flex; gap: 18px; align-items: center; }
.nav a {
  color: var(--ink-dim); font-family: var(--mono); font-size: 11.5px;
  letter-spacing: 0.04em;
}
.nav a:hover { color: var(--ink); text-decoration: none; }

.controls { display: flex; gap: 8px; align-items: center; }
.lang-toggle, .theme-toggle {
  display: inline-flex; border: 1px solid var(--border-strong);
  border-radius: 999px; overflow: hidden; background: var(--surface);
}
.lang-toggle button, .theme-toggle button {
  font-family: var(--mono); font-size: 11.5px;
  background: transparent; color: var(--ink-dim); border: 0;
  padding: 6px 12px; cursor: pointer;
}
.lang-toggle button.active, .theme-toggle button.active {
  background: var(--ink); color: var(--bg);
}

@media (max-width: 1180px) { .nav { display: none; } }

/* ─── Hero ─────────────────────────────── */
.hero {
  padding: 140px 0 110px;
  border-bottom: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(50% 60% at 75% 25%, var(--primary-glow), transparent 60%),
    radial-gradient(45% 60% at 22% 80%, var(--cosmos-soft), transparent 60%),
    radial-gradient(35% 45% at 60% 95%, var(--neural-soft), transparent 60%);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(250,250,250,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(250,250,250,0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 65% at center, black 30%, transparent 90%);
  -webkit-mask-image: radial-gradient(ellipse 80% 65% at center, black 30%, transparent 90%);
}
.hero-inner { position: relative; }
.hero-eyebrow {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.18em;
  color: var(--primary); margin-bottom: 28px;
  text-transform: uppercase;
}
.hero h1 {
  font-family: var(--display); font-weight: 600;
  font-size: clamp(52px, 8vw, 120px);
  line-height: 1.0; letter-spacing: -0.025em;
  margin: 0 0 28px; color: var(--ink);
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--primary) 0%, var(--cosmos) 50%, var(--neural) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 19px; color: var(--ink-dim); max-width: 800px;
  margin: 0 0 40px; line-height: 1.6;
}
.hero-cta {
  display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 48px;
}
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 22px; border-radius: 999px;
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.02em;
  text-decoration: none; cursor: pointer; border: 0;
  transition: transform 0.16s, background 0.16s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: var(--bg); }
.btn-primary:hover { background: var(--ink); color: var(--bg); }
.btn-ghost {
  background: transparent; color: var(--ink-dim);
  border: 1px solid var(--border-strong);
}
.btn-ghost:hover { color: var(--ink); border-color: var(--ink-dim); }

.hero-meta {
  display: flex; flex-wrap: wrap; gap: 32px;
  font-family: var(--mono); font-size: 11.5px;
  color: var(--ink-mute); border-top: 1px solid var(--border);
  padding-top: 24px;
}
.hero-meta div { display: flex; flex-direction: column; gap: 4px; }
.hero-meta div span:first-child {
  font-family: var(--display); font-size: 22px; font-weight: 600;
  color: var(--ink);
}

/* ─── Section ─────────────────────────────── */
section.module {
  padding: 110px 0; border-bottom: 1px solid var(--border);
  position: relative;
}
.section-head {
  display: grid; grid-template-columns: 240px 1fr; gap: 44px;
  margin-bottom: 48px; align-items: start;
}
.section-tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.10em;
  color: var(--ink-mute); text-transform: uppercase;
}
.section-tag .num { color: var(--primary); font-weight: 700; margin-right: 8px; }
.section-head h2 {
  font-family: var(--display); font-weight: 600;
  font-size: clamp(34px, 4.8vw, 60px); margin: 0;
  line-height: 1.04; color: var(--ink); letter-spacing: -0.025em;
}
.section-lede {
  margin-top: 20px; color: var(--ink-dim); max-width: 820px;
  font-size: 17px; line-height: 1.65;
}
@media (max-width: 760px) { .section-head { grid-template-columns: 1fr; gap: 12px; } }

/* ─── Civilization timeline (massive horizontal) ─────── */
.timeline-wrap {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px;
  overflow-x: auto;
  box-shadow: var(--shadow);
}
.timeline {
  display: grid;
  grid-template-columns: repeat(16, minmax(170px, 1fr));
  gap: 0;
  position: relative;
  min-width: 2400px;
  padding-bottom: 50px;
}
.timeline::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 14px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cosmos), var(--neural), var(--primary), var(--civic), transparent);
  opacity: 0.6;
}
.tl-node { position: relative; padding: 0 14px 36px; }
.tl-node .dot {
  position: absolute; bottom: 8px; left: 50%; transform: translateX(-50%);
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent, var(--primary));
}
.tl-node .stem {
  position: absolute; bottom: 22px; left: 50%; transform: translateX(-50%);
  width: 1px; height: 36px;
  background: var(--border-strong);
}
.tl-node .when {
  font-family: var(--mono); font-size: 10.5px; color: var(--ink-mute);
  letter-spacing: 0.04em; margin-bottom: 4px;
}
.tl-node .what {
  font-family: var(--display); font-weight: 600; font-size: 18px;
  color: var(--ink); margin-bottom: 6px; line-height: 1.2;
}
.tl-node .blurb {
  font-size: 13px; color: var(--ink-dim); line-height: 1.55;
}
.tl-node.psy .dot {
  width: 18px; height: 18px;
  background: var(--primary);
  box-shadow: 0 0 14px var(--primary-glow);
}
.tl-node.psy .what {
  background: linear-gradient(120deg, var(--primary), var(--cosmos));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ─── Architecture / Psy diagram ─────────────────────────────── */
.arch-card {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
  box-shadow: var(--shadow);
}
.arch-svg-wrap { width: 100%; overflow: hidden; border-radius: 10px; }
.arch-svg { width: 100%; height: auto; display: block; }

/* ─── Cards ─────────────────────────────── */
.card-row {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
  position: relative; overflow: hidden;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.card::before {
  content: ""; position: absolute; left: 0; top: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent, var(--primary)), transparent);
  opacity: 0.6;
}
.card.primary { --accent: var(--primary); }
.card.cosmos  { --accent: var(--cosmos); }
.card.neural  { --accent: var(--neural); }
.card.civic   { --accent: var(--civic); }
.card.energy  { --accent: var(--energy); }
.card.signal  { --accent: var(--signal); }
.card.crimson { --accent: var(--crimson); }
.card .kicker {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em;
  color: var(--accent, var(--primary)); margin-bottom: 14px;
}
.card h3 {
  font-family: var(--display); font-weight: 600; font-size: 23px;
  margin: 0 0 12px; color: var(--ink); line-height: 1.2;
}
.card p { color: var(--ink-dim); font-size: 14.5px; line-height: 1.7; margin: 0 0 8px; }

/* ─── Tech tree (grid of dependencies) ─────────────────────── */
.techtree {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}
.tech {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 16px;
  position: relative;
}
.tech::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 2px;
  background: var(--tier-color, var(--primary));
}
.tech.t1 { --tier-color: var(--energy); }
.tech.t2 { --tier-color: var(--civic); }
.tech.t3 { --tier-color: var(--cosmos); }
.tech.t4 { --tier-color: var(--neural); }
.tech.t5 { --tier-color: var(--primary); }
.tech .tier {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.10em;
  color: var(--tier-color, var(--primary)); margin-bottom: 6px;
  text-transform: uppercase;
}
.tech .name {
  font-family: var(--display); font-size: 18px; font-weight: 600;
  color: var(--ink); margin-bottom: 4px;
}
.tech .when {
  font-family: var(--mono); font-size: 10.5px; color: var(--ink-mute);
  margin-bottom: 8px;
}
.tech .desc {
  font-size: 13px; color: var(--ink-dim); line-height: 1.55;
}

/* ─── Comparison table ─────────────────────────────── */
.comp-table {
  width: 100%; border-collapse: collapse; font-size: 14.5px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
.comp-table th, .comp-table td {
  text-align: left; padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.comp-table th {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.10em;
  color: var(--primary);
  background: var(--surface-2);
  text-transform: uppercase;
}
.comp-table tr:last-child td { border-bottom: 0; }
.comp-table td:first-child { color: var(--ink); font-family: var(--display); font-size: 17px; font-weight: 600; }

/* ─── Energy bar chart ─────────────────────────────── */
.bars {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
}
.bar {
  display: grid; grid-template-columns: 220px 1fr 100px;
  gap: 14px; align-items: center; margin-bottom: 14px;
  font-family: var(--mono); font-size: 12px; color: var(--ink-dim);
}
.bar .label .swatch {
  display: inline-block; width: 8px; height: 8px; border-radius: 2px;
  margin-right: 8px; vertical-align: middle;
}
.bar .meter {
  height: 12px; border-radius: 4px;
  background: var(--surface-2); position: relative; overflow: hidden;
}
.bar .meter > i {
  position: absolute; left: 0; top: 0; bottom: 0;
  background: var(--bar-color, var(--primary));
}
.bar .v {
  font-family: var(--display); font-size: 17px; color: var(--ink); text-align: right;
}

/* ─── Future simulator ─────────────────────────────── */
.sim-shell {
  display: grid; grid-template-columns: 340px 1fr; gap: 28px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px;
  box-shadow: var(--shadow);
}
@media (max-width: 920px) { .sim-shell { grid-template-columns: 1fr; } }
.sim-shell h3 {
  font-family: var(--display); font-weight: 600; font-size: 22px;
  margin: 0 0 16px;
}
.sim-controls label {
  display: block; font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.10em; color: var(--ink-mute);
  margin-bottom: 6px; margin-top: 16px; text-transform: uppercase;
}
.sim-controls select, .sim-controls input[type="range"] {
  width: 100%;
  background: var(--surface-2); color: var(--ink);
  border: 1px solid var(--border-strong); border-radius: 6px;
  padding: 9px 12px; font-family: var(--mono); font-size: 13px;
}
.sim-output { display: flex; flex-direction: column; gap: 14px; }
.sim-output .sbar {
  display: grid; grid-template-columns: 220px 1fr 60px;
  gap: 12px; align-items: center;
  font-family: var(--mono); font-size: 12px; color: var(--ink-dim);
}
.sim-output .sbar .meter {
  height: 9px; border-radius: 4px;
  background: var(--surface-2); position: relative; overflow: hidden;
}
.sim-output .sbar .meter > i {
  position: absolute; left: 0; top: 0; bottom: 0;
  background: linear-gradient(90deg, var(--cosmos), var(--neural), var(--primary));
  transition: width 0.4s;
}
.sim-output .sbar .v { color: var(--ink); text-align: right; font-family: var(--display); font-size: 17px; font-weight: 600; }
.sim-readout {
  font-family: var(--mono); font-size: 12.5px; color: var(--ink-dim);
  border: 1px dashed var(--border-strong);
  border-radius: 8px; padding: 14px 16px; margin-top: 8px;
  line-height: 1.7;
}

/* ─── AI ─────────────────────────────── */
.ai-shell {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px;
  box-shadow: var(--shadow);
}
.ai-prompts { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.ai-prompt {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.02em;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px; padding: 9px 16px; color: var(--ink-dim);
  cursor: pointer; transition: all 0.16s;
}
.ai-prompt:hover { color: var(--ink); border-color: var(--primary); }
.ai-input-row { display: flex; gap: 10px; }
.ai-input-row input {
  flex: 1; background: var(--surface-2); color: var(--ink);
  border: 1px solid var(--border-strong); border-radius: 8px;
  padding: 13px 16px; font-family: var(--body); font-size: 14.5px;
}
.ai-input-row button {
  background: var(--primary); color: var(--bg); border: 0;
  padding: 13px 24px; font-family: var(--mono); font-size: 12px;
  letter-spacing: 0.02em;
  border-radius: 8px; cursor: pointer; font-weight: 700;
}
.ai-input-row button:hover { background: var(--ink); color: var(--bg); }
.ai-output {
  margin-top: 22px; min-height: 80px;
  font-size: 15.5px; line-height: 1.78; color: var(--ink-dim);
  border-top: 1px solid var(--border); padding-top: 20px;
}
.ai-output strong { color: var(--ink); }
.ai-output em {
  font-style: normal; color: var(--primary); font-family: var(--mono);
  font-size: 12.5px; letter-spacing: 0.04em;
}
.ai-output p { margin: 0 0 14px; }

/* ─── Guardrails ─────────────────────────────── */
.guardrails {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 30px;
  border-left: 3px solid var(--crimson);
}
.guardrails h3 { font-family: var(--display); font-weight: 600; margin: 0 0 14px; font-size: 22px; }
.guardrails ul { margin: 0; padding-left: 22px; }
.guardrails li { color: var(--ink-dim); margin-bottom: 12px; font-size: 14.5px; line-height: 1.7; }

/* ─── Footer ─────────────────────────────── */
footer {
  padding: 80px 0 60px;
  font-family: var(--mono); font-size: 12px; color: var(--ink-mute);
  letter-spacing: 0.02em;
}
footer a { color: var(--ink-dim); }
footer a:hover { color: var(--ink); }
footer .foot-row {
  display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
footer .links { display: flex; gap: 22px; flex-wrap: wrap; }

/* ─── Subtle motion ─────────────────────────────── */
@keyframes flow {
  0%   { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: -120; }
}
.flow-line {
  stroke-dasharray: 6 6;
  animation: flow 8s linear infinite;
}
@media (prefers-reduced-motion: reduce) { .flow-line { animation: none; } }

/* ─── Util ─────────────────────────────── */
.mono { font-family: var(--mono); }
.dim  { color: var(--ink-dim); }
.tag-primary { color: var(--primary); }
.tag-cosmos  { color: var(--cosmos); }
.tag-neural  { color: var(--neural); }
.tag-civic   { color: var(--civic); }
.tag-energy  { color: var(--energy); }
.tag-signal  { color: var(--signal); }