/* ===== PsyVerse — Internet of Verifiable Intelligence ===== */
:root{
  --bg: #0a0a0c;
  --bg-2: #11121a;
  --bg-3: #1a1c28;
  --line: rgba(250,250,250,0.10);
  --line-2: rgba(250,250,250,0.22);
  --ink: #fafafa;
  --ink-soft: #a3a3ab;
  /* Canonical Psy mint + cyan + violet */
  --mint: #61f5b3;
  --mint-glow: rgba(97,245,179,0.28);
  --cyan: #4ec5ff;
  --violet: #a07ad6;
  --rose: #ff75a8;
  --gold: #f0d05e;
  --primary: #61f5b3;
}
[data-theme="light"]{
  --bg: #f7f8fa;
  --bg-2: #ffffff;
  --bg-3: #eceef2;
  --line: rgba(10,10,12,0.10);
  --line-2: rgba(10,10,12,0.22);
  --ink: #0a0a0c;
  --ink-soft: #4a5060;
  --mint: #00b87b;
  --mint-glow: rgba(0,184,123,0.18);
  --cyan: #1a8eb8;
  --violet: #6a4ab0;
  --rose: #b53f74;
  --gold: #a8772a;
  --primary: #00b87b;
}

*{box-sizing: border-box}
html, body{margin: 0; padding: 0}
html{scroll-behavior: smooth; scroll-padding-top: 72px}
body{
  font-family: "Inter", "Noto Sans SC", system-ui, sans-serif;
  font-size: 16px; line-height: 1.6;
  color: var(--ink); background: var(--bg);
  overflow-x: hidden;
}

/* Hero canvas behind everything */
#neural-bg{
  position: fixed; inset: 0; z-index: 0;
  width: 100vw; height: 100vh;
  pointer-events: none;
  opacity: 0.85;
}
[data-theme="light"] #neural-bg{opacity: 0.55}

a{color: var(--ink); text-decoration: none; transition: color .15s}
a:hover{color: var(--mint)}
em{font-style: normal; color: var(--mint)}
code, .mono{font-family: "JetBrains Mono", ui-monospace, monospace}

/* Bilingual */
[lang="zh"]{display: none}
html[data-lang="zh"] [lang="en"]{display: none}
html[data-lang="zh"] [lang="zh"]{display: initial}
html[data-lang="zh"]{font-family: "Noto Sans SC", "Inter", system-ui, sans-serif;}

/* Topbar */
.topbar{
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--bg) 80%, transparent);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid var(--line);
}
.topbar-inner{
  max-width: 1320px; margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; gap: 18px;
}
.brand{
  display: flex; align-items: center; gap: 12px;
  font-family: "Cabin Condensed", system-ui, sans-serif;
  font-size: 22px; font-weight: 700; letter-spacing: -.005em;
  text-decoration: none; color: var(--ink);
}
.brand .seal{
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 8px;
  background: var(--mint);
  box-shadow: 0 0 18px var(--mint-glow);
}
.brand .seal img{width: 60%; height: 65%; display: block; filter: brightness(0)}
.brand em{color: var(--mint); font-style: normal; font-weight: 600; letter-spacing: -.01em}
.nav{display: flex; gap: 18px; flex-wrap: wrap; margin-left: 8px}
.nav a{
  font-family: "Inter", system-ui, sans-serif;
  font-size: 13px; font-weight: 500;
  color: var(--ink-soft);
  padding: 6px 0; border-bottom: 1px solid transparent;
}
.nav a:hover{color: var(--ink); border-bottom-color: var(--mint)}
.toolbar{margin-left: auto; display: flex; gap: 10px}
.lang-toggle, .theme-toggle{
  display: inline-flex; gap: 0;
  border: 1px solid var(--line); border-radius: 6px; overflow: hidden;
}
.lang-toggle button, .theme-toggle button{
  font-family: "JetBrains Mono", monospace; font-size: 11px;
  background: transparent; color: var(--ink-soft);
  border: none; border-right: 1px solid var(--line);
  padding: 6px 11px; cursor: pointer; letter-spacing: .04em;
}
.lang-toggle button:last-child, .theme-toggle button:last-child{border-right: none}
.lang-toggle button.active, .theme-toggle button.active{background: var(--mint); color: var(--bg)}

/* ===== Hero ===== */
.hero{
  position: relative; z-index: 1;
  max-width: 1320px; margin: 0 auto;
  padding: 110px 24px 80px;
  min-height: 88vh;
  display: flex; flex-direction: column; justify-content: center;
}
.hero-eyebrow{
  font-family: "JetBrains Mono", monospace;
  font-size: 12px; letter-spacing: .14em;
  color: var(--mint); text-transform: uppercase;
  margin-bottom: 28px;
  display: flex; align-items: center; gap: 10px;
}
.hero-eyebrow::before{
  content: ""; display: inline-block; width: 8px; height: 8px;
  border-radius: 50%; background: var(--mint);
  box-shadow: 0 0 12px var(--mint);
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse{ 0%,100%{opacity: 1} 50%{opacity: 0.35} }

.hero h1{
  font-family: "Cabin Condensed", system-ui, sans-serif;
  font-weight: 700;
  font-size: clamp(46px, 8vw, 102px);
  line-height: .96; letter-spacing: -.025em;
  margin: 0 0 28px; max-width: 16ch;
  text-rendering: optimizeLegibility;
}
.hero h1 em{
  background: linear-gradient(120deg, var(--mint), var(--cyan), var(--violet));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub{
  font-family: "Cabin Condensed", system-ui, sans-serif;
  font-size: clamp(18px, 2vw, 24px); line-height: 1.35;
  color: var(--ink-soft); font-weight: 400;
  max-width: 64ch; margin: 0 0 36px;
}

.hero-counters{
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 14px; max-width: 980px; margin: 0 0 36px;
}
.counter{
  border: 1px solid var(--line); border-radius: 10px;
  background: color-mix(in oklab, var(--bg-2) 70%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 18px 20px;
  position: relative;
}
.counter .num{
  font-family: "JetBrains Mono", monospace;
  font-size: 28px; font-weight: 600;
  color: var(--ink); letter-spacing: -.01em;
  display: block;
}
.counter .label{
  font-family: "JetBrains Mono", monospace;
  font-size: 10px; letter-spacing: .12em;
  color: var(--ink-soft); text-transform: uppercase;
  margin-top: 4px;
}
.counter::after{
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--mint), transparent);
  opacity: 0.45;
}
.counters-note{
  font-family: "JetBrains Mono", monospace;
  font-size: 11px; color: var(--ink-soft);
  margin: -28px 0 32px; opacity: 0.6;
}

.hero-actions{display: flex; flex-wrap: wrap; gap: 12px}
.btn{
  font-family: "Inter", system-ui, sans-serif;
  font-size: 14px; font-weight: 500;
  padding: 12px 22px; border-radius: 8px;
  border: 1px solid var(--line-2);
  background: color-mix(in oklab, var(--bg-2) 70%, transparent);
  color: var(--ink); text-decoration: none;
  display: inline-flex; align-items: center; gap: 8px;
  transition: border-color .15s, transform .15s;
  cursor: pointer; backdrop-filter: blur(8px);
}
.btn:hover{border-color: var(--mint); color: var(--mint); transform: translateY(-1px)}
.btn.primary{background: var(--mint); color: var(--bg); border-color: var(--mint); font-weight: 600}
.btn.primary:hover{background: color-mix(in oklab, var(--mint) 85%, white); color: var(--bg); transform: translateY(-1px)}

/* ===== Sections ===== */
section{
  position: relative; z-index: 1;
  max-width: 1320px; margin: 0 auto;
  padding: 100px 24px;
  border-top: 1px solid var(--line);
}
section.no-rule{border-top: none}
.section-eyebrow{
  font-family: "JetBrains Mono", monospace;
  font-size: 11px; letter-spacing: .14em;
  color: var(--mint); text-transform: uppercase;
  margin: 0 0 14px;
}
.section-title{
  font-family: "Cabin Condensed", system-ui, sans-serif; font-weight: 700;
  font-size: clamp(34px, 4.5vw, 60px);
  line-height: 1.05; margin: 0 0 18px;
  letter-spacing: -.022em; max-width: 18ch;
}
.section-lede{
  font-size: 18px; line-height: 1.6; color: var(--ink-soft);
  max-width: 64ch; margin: 0 0 36px;
}

/* Glass canvas wrapper */
.glass{
  border: 1px solid var(--line); border-radius: 12px;
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--bg-2) 75%, transparent),
    color-mix(in oklab, var(--bg-3) 60%, transparent));
  backdrop-filter: blur(12px) saturate(1.1);
  -webkit-backdrop-filter: blur(12px) saturate(1.1);
  overflow: hidden; position: relative;
}
.glass svg{display: block; width: 100%; height: auto}

/* ===== Cards ===== */
.grid{ display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid.two{grid-template-columns: repeat(auto-fit, minmax(380px, 1fr))}
.grid.three{grid-template-columns: repeat(auto-fit, minmax(320px, 1fr))}
.card{
  border: 1px solid var(--line);
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--bg-2) 80%, transparent),
    color-mix(in oklab, var(--bg-2) 95%, transparent));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 12px; padding: 24px;
  position: relative; transition: border-color .15s, transform .15s;
}
.card:hover{border-color: var(--line-2); transform: translateY(-1px)}
.card .meta{
  font-family: "JetBrains Mono", monospace;
  font-size: 11px; letter-spacing: .08em;
  color: var(--mint); text-transform: uppercase;
  margin-bottom: 12px;
}
.card.cyan .meta{color: var(--cyan)}
.card.violet .meta{color: var(--violet)}
.card.rose .meta{color: var(--rose)}
.card.gold .meta{color: var(--gold)}
.card h3{
  font-family: "Cabin Condensed", system-ui, sans-serif; font-weight: 700;
  font-size: 22px; margin: 0 0 10px; line-height: 1.15;
  letter-spacing: -.01em;
}
.card p{margin: 0 0 10px; line-height: 1.55; color: var(--ink-soft)}

/* ===== Topology graph ===== */
.topology{ aspect-ratio: 16/8; }

/* ===== Civilization timeline ===== */
.timeline{
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 0; border: 1px solid var(--line); border-radius: 12px;
  background: linear-gradient(180deg, color-mix(in oklab, var(--bg-2) 75%, transparent), color-mix(in oklab, var(--bg-3) 60%, transparent));
  backdrop-filter: blur(10px);
  overflow: hidden;
}
.t-cell{
  padding: 28px 22px; border-right: 1px solid var(--line);
  position: relative;
}
.t-cell:last-child{border-right: none}
.t-cell .step{
  font-family: "JetBrains Mono", monospace;
  font-size: 11px; color: var(--mint); letter-spacing: .12em;
  margin-bottom: 14px; display: flex; align-items: center; gap: 6px;
}
.t-cell .step::before{
  content: ""; display: inline-block; width: 8px; height: 8px;
  border-radius: 50%; background: var(--mint); opacity: 0.7;
}
.t-cell h4{
  font-family: "Cabin Condensed", system-ui, sans-serif; font-weight: 700;
  font-size: 22px; line-height: 1.1; margin: 0 0 8px;
  letter-spacing: -.005em;
}
.t-cell .when{
  font-family: "JetBrains Mono", monospace;
  font-size: 10px; color: var(--ink-soft); letter-spacing: .04em;
  margin-bottom: 12px;
}
.t-cell p{margin: 0; font-size: 13px; color: var(--ink-soft); line-height: 1.5}

/* ===== Proof panels ===== */
.proof-panel{
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 24px; align-items: stretch;
}
.proof-panel .glass{padding: 28px}
.proof-panel h3{
  font-family: "Cabin Condensed", system-ui, sans-serif;
  font-size: 26px; font-weight: 700;
  letter-spacing: -.01em;
  margin: 0 0 12px; line-height: 1.15;
}
.proof-panel .equation{
  font-family: "JetBrains Mono", monospace;
  font-size: 13px; color: var(--ink-soft);
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  border: 1px solid var(--line);
  padding: 16px; border-radius: 8px;
  margin: 16px 0;
  line-height: 1.7;
}
.proof-panel .equation .accent{color: var(--mint)}
.proof-panel .equation .accent2{color: var(--cyan)}
.proof-panel .equation .accent3{color: var(--violet)}

/* ===== Code panels ===== */
.code-grid{
  display: grid; grid-template-columns: 280px 1fr;
  gap: 20px;
}
.code-tabs{
  display: flex; flex-direction: column; gap: 6px;
}
.code-tab{
  font-family: "JetBrains Mono", monospace;
  font-size: 12px; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: 8px;
  background: color-mix(in oklab, var(--bg-2) 70%, transparent);
  color: var(--ink-soft); cursor: pointer;
  text-align: left;
  transition: border-color .15s, color .15s;
}
.code-tab:hover{border-color: var(--mint); color: var(--ink)}
.code-tab.active{
  border-color: var(--mint);
  color: var(--mint);
  background: color-mix(in oklab, var(--mint) 8%, var(--bg-2));
}
.code-tab .label{
  font-family: "Cabin Condensed", system-ui, sans-serif;
  font-size: 16px; font-weight: 600; display: block; margin-bottom: 2px;
  color: inherit;
}
.code-tab .desc{font-size: 11px; opacity: 0.7; line-height: 1.4}
.code-panel{
  border: 1px solid var(--line); border-radius: 12px;
  background: color-mix(in oklab, var(--bg-2) 92%, transparent);
  backdrop-filter: blur(10px);
  padding: 22px 24px; min-height: 320px;
  font-family: "JetBrains Mono", monospace;
  font-size: 13px; line-height: 1.7;
  color: var(--ink-soft);
  position: relative; overflow: hidden;
}
.code-panel pre{margin: 0; white-space: pre-wrap; font-family: inherit}
.code-panel .kw{color: var(--violet)}
.code-panel .fn{color: var(--cyan)}
.code-panel .str{color: var(--mint)}
.code-panel .com{color: var(--ink-soft); opacity: 0.5}
.code-panel .num{color: var(--gold)}
.code-panel .typ{color: var(--rose)}
.code-panel::before{
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--mint), var(--cyan), transparent);
  opacity: 0.5;
}

/* ===== Footer ===== */
footer{
  position: relative; z-index: 1;
  max-width: 1320px; margin: 0 auto;
  padding: 60px 24px 80px;
  border-top: 1px solid var(--line);
}
.footer-grid{
  display: grid; grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 24px; margin-bottom: 36px;
}
.footer-col h5{
  font-family: "JetBrains Mono", monospace;
  font-size: 11px; letter-spacing: .14em;
  color: var(--ink-soft); text-transform: uppercase;
  margin: 0 0 14px; font-weight: 500;
}
.footer-col a{
  display: block;
  font-size: 14px; color: var(--ink); padding: 4px 0;
  font-family: "Inter", system-ui, sans-serif;
}
.footer-col a:hover{color: var(--mint)}
.footer-bottom{
  display: flex; justify-content: space-between; flex-wrap: wrap;
  gap: 12px; padding-top: 24px;
  border-top: 1px solid var(--line);
  font-family: "JetBrains Mono", monospace;
  font-size: 11px; color: var(--ink-soft); letter-spacing: .04em;
}

/* ===== Responsive ===== */
@media (max-width: 900px){
  .nav{display: none}
  .hero-counters{grid-template-columns: repeat(2, 1fr)}
  .timeline{grid-template-columns: 1fr}
  .t-cell{border-right: none; border-bottom: 1px solid var(--line)}
  .t-cell:last-child{border-bottom: none}
  .proof-panel{grid-template-columns: 1fr}
  .code-grid{grid-template-columns: 1fr}
  .footer-grid{grid-template-columns: 1fr 1fr}
}
@media (max-width: 600px){
  .topbar-inner{padding: 10px 16px; gap: 10px}
  .hero{padding: 70px 16px 50px; min-height: auto}
  section{padding: 70px 16px}
  .hero-counters{grid-template-columns: 1fr 1fr}
  .footer-grid{grid-template-columns: 1fr 1fr}
}