/* ============================================================
   ALPHAFUTURE.AI — design system
   near-black #080C14 · single cyan accent #00D4FF
   IBM Plex Mono (metadata) + Inter (body/display)
   sharp corners · hairline rules · film grain · 12px rhythm
   ============================================================ */

:root {
  --bg: #080C14;
  --bg-raise: #0C1220;
  --ink: #E8EDF4;
  --ink-dim: rgba(232, 237, 244, 0.55);
  --ink-faint: rgba(232, 237, 244, 0.32);
  --accent: #00D4FF;
  --rule: rgba(232, 237, 244, 0.14);
  --rule-soft: rgba(232, 237, 244, 0.08);
  --mono: "IBM Plex Mono", "Noto Sans TC", monospace;
  --sans: "Inter", "Noto Sans TC", -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: var(--bg); }

/* ---------- film grain overlay ---------- */
.grain {
  position: fixed; inset: -100%;
  width: 300%; height: 300%;
  pointer-events: none;
  z-index: 200;
  opacity: 0.14;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.9 0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 240px 240px;
  animation: grain 8s steps(10) infinite;
}
@keyframes grain {
  0%,100% { transform: translate(0,0); } 10% { transform: translate(-5%,-8%); }
  20% { transform: translate(-12%,4%); } 30% { transform: translate(6%,-14%); }
  40% { transform: translate(-4%,12%); } 50% { transform: translate(-10%,6%); }
  60% { transform: translate(12%,0); } 70% { transform: translate(0,10%); }
  80% { transform: translate(3%,12%); } 90% { transform: translate(-8%,3%); }
}

/* ---------- typography ---------- */
.mono {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.mono.accent { color: var(--accent); }

h1.display {
  font-weight: 200;
  font-size: clamp(44px, 8.5vw, 120px);
  line-height: 1.02;
  letter-spacing: -0.03em;
}
h2.section-title {
  font-weight: 300;
  font-size: clamp(30px, 4.6vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 18em;
}
p.lede { font-size: clamp(17px, 1.5vw, 20px); color: var(--ink-dim); max-width: 34em; font-weight: 300; }
p.body { color: var(--ink-dim); max-width: 38em; font-weight: 300; }
p.body + p.body { margin-top: 1.2em; }

/* ---------- layout ---------- */
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 clamp(20px, 4vw, 56px); }
section { padding: clamp(80px, 12vh, 160px) 0; position: relative; }
.rule-top { border-top: 1px solid var(--rule); }

.grid-12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: 24px; }
.offset-block { grid-column: 5 / 13; }
.num-col { grid-column: 1 / 3; }

/* ---------- header ---------- */
header.site {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 22px clamp(20px, 4vw, 56px);
  display: flex; justify-content: space-between; align-items: baseline;
  mix-blend-mode: normal;
  background: linear-gradient(to bottom, rgba(8,12,20,0.85), transparent);
}
.brand { font-family: var(--mono); font-size: 13px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink); text-decoration: none; }
.brand em { font-style: normal; color: var(--accent); }
nav.site-nav { display: flex; gap: clamp(16px, 2.5vw, 36px); }
nav.site-nav a {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim); text-decoration: none; transition: color 0.22s var(--ease-out);
}
nav.site-nav a:hover, nav.site-nav a[aria-current] { color: var(--accent); }
@media (max-width: 760px) { nav.site-nav { display: none; } }

/* ---------- hero ---------- */
.hero { min-height: 100vh; display: flex; flex-direction: column; justify-content: flex-end; padding-bottom: 8vh; }
.hero .meta-strip { margin-bottom: 5vh; display: flex; gap: 28px; flex-wrap: wrap; }
.hero h1 .line { display: block; overflow: hidden; }
.hero h1 .line span { display: inline-block; transform: translateY(110%); }
.hero .sub { margin-top: 5vh; max-width: 34em; }

.cta-row { display: flex; gap: 40px; margin-top: 6vh; flex-wrap: wrap; }
a.text-cta {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink); text-decoration: none; padding-bottom: 6px;
  border-bottom: 1px solid var(--rule); transition: border-color 0.22s, color 0.22s;
}
a.text-cta:hover { color: var(--accent); border-color: var(--accent); }
a.text-cta.primary { color: var(--accent); border-color: var(--accent); }
a.text-cta.primary:hover { color: var(--ink); border-color: var(--ink); }

/* ---------- ticker metadata strip ---------- */
.meta-strip { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); }
.meta-strip span { display: inline-flex; align-items: center; gap: 28px; }
.meta-strip span::after { content: "·"; color: var(--accent); }
.meta-strip span:last-child::after { content: ""; }

/* ---------- dual track ---------- */
.tracks { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--rule); }
.track { padding: clamp(32px, 4vw, 64px) clamp(24px, 3vw, 48px); transition: opacity 0.22s var(--ease-out); text-decoration: none; color: inherit; display: block; }
.track + .track { border-left: 1px solid var(--rule); }
.tracks:hover .track { opacity: 0.25; }
.tracks:hover .track:hover { opacity: 1; }
.track .t-num { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--accent); }
.track h3 { font-weight: 300; font-size: clamp(24px, 2.6vw, 38px); letter-spacing: -0.01em; margin: 18px 0 6px; }
.track .t-label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); }
.track p { margin-top: 20px; color: var(--ink-dim); font-weight: 300; max-width: 30em; }
.track .go { margin-top: 28px; display: inline-block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); }
@media (max-width: 860px) { .tracks { grid-template-columns: 1fr; } .track + .track { border-left: none; border-top: 1px solid var(--rule); } }

/* ---------- numbered rows (subpages / lists) ---------- */
.rows { border-top: 1px solid var(--rule); }
.row { display: grid; grid-template-columns: 80px 1fr; gap: 24px; padding: 34px 0; border-bottom: 1px solid var(--rule-soft); }
.row .r-num { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--accent); padding-top: 6px; }
.row h3 { font-weight: 400; font-size: clamp(18px, 1.8vw, 24px); margin-bottom: 8px; }
.row p { color: var(--ink-dim); font-weight: 300; max-width: 40em; }
.row .r-label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); margin-top: 12px; display: block; }

/* ---------- pull quote ---------- */
.pull { font-weight: 200; font-size: clamp(26px, 4vw, 52px); line-height: 1.25; letter-spacing: -0.015em; max-width: 22em; }
.pull + .attribution { margin-top: 32px; }

/* ---------- three cards (technology) ---------- */
.cards3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--rule); border-left: 1px solid var(--rule); }
.card3 { padding: 40px 32px 48px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.card3 .c-name { font-family: var(--mono); font-size: 13px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink); }
.card3 .c-label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); margin-top: 6px; }
.card3 p { margin-top: 20px; color: var(--ink-dim); font-weight: 300; font-size: 15px; }
@media (max-width: 860px) { .cards3 { grid-template-columns: 1fr; } }

/* ---------- status pill ---------- */
.status {
  display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); border: 1px solid var(--accent); padding: 8px 14px;
}

/* ---------- journal list ---------- */
.post { display: block; text-decoration: none; color: inherit; padding: 36px 0; border-bottom: 1px solid var(--rule-soft); transition: opacity .22s var(--ease-out); }
.posts:hover .post { opacity: 0.3; } .posts:hover .post:hover { opacity: 1; }
.post h3 { font-weight: 300; font-size: clamp(22px, 2.4vw, 34px); letter-spacing: -0.01em; margin-top: 10px; }
.post p { margin-top: 10px; color: var(--ink-dim); font-weight: 300; max-width: 40em; }

/* ---------- contact ---------- */
.paths { border-top: 1px solid var(--rule); }
.path { display: grid; grid-template-columns: 80px 1fr auto; align-items: baseline; gap: 24px; padding: 30px 0; border-bottom: 1px solid var(--rule-soft); text-decoration: none; color: inherit; transition: opacity .22s var(--ease-out); }
.paths:hover .path { opacity: 0.3; } .paths:hover .path:hover { opacity: 1; }
.path .p-num { font-family: var(--mono); font-size: 11px; color: var(--accent); letter-spacing: 0.14em; }
.path h3 { font-weight: 300; font-size: clamp(20px, 2.2vw, 30px); }
.path .p-sub { color: var(--ink-faint); font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; margin-top: 6px; }
.path .arrow { color: var(--accent); font-family: var(--mono); }
@media (max-width: 700px) { .path { grid-template-columns: 48px 1fr; } .path .arrow { display: none; } }

/* ---------- footer ---------- */
footer.site { border-top: 1px solid var(--rule); padding: 64px 0 40px; }
footer .f-grid { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
footer .f-links { display: flex; gap: 28px; flex-wrap: wrap; }
footer .f-links a { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-dim); text-decoration: none; }
footer .f-links a:hover { color: var(--accent); }
footer .f-micro { margin-top: 48px; font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); }

/* ---------- language switcher ---------- */
.lang-switch { display: flex; gap: 4px; align-items: baseline; }
.lang-switch a {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em;
  color: var(--ink-faint); text-decoration: none; padding: 4px 6px;
  transition: color 0.22s var(--ease-out);
}
.lang-switch a:hover { color: var(--ink); }
.lang-switch a[aria-current] { color: var(--accent); border-bottom: 1px solid var(--accent); }

/* ---------- Chinese locale font stacks ---------- */
html[lang="zh-HK"] body, html[lang="zh-HK"] h1, html[lang="zh-HK"] h2, html[lang="zh-HK"] h3,
html[lang="zh-HK"] p, html[lang="zh-HK"] a {
  font-family: "Inter", "Noto Sans TC", -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
}
html[lang="zh-HK"] .mono, html[lang="zh-HK"] .meta-strip, html[lang="zh-HK"] .t-num,
html[lang="zh-HK"] .t-label, html[lang="zh-HK"] .r-num, html[lang="zh-HK"] .r-label,
html[lang="zh-HK"] .c-name, html[lang="zh-HK"] .c-label, html[lang="zh-HK"] .status,
html[lang="zh-HK"] .p-num, html[lang="zh-HK"] .p-sub, html[lang="zh-HK"] .f-micro,
html[lang="zh-HK"] nav.site-nav a, html[lang="zh-HK"] a.text-cta, html[lang="zh-HK"] .go {
  font-family: "IBM Plex Mono", "Noto Sans TC", monospace;
  letter-spacing: 0.06em;
}
html[lang="zh-CN"] body, html[lang="zh-CN"] h1, html[lang="zh-CN"] h2, html[lang="zh-CN"] h3,
html[lang="zh-CN"] p, html[lang="zh-CN"] a {
  font-family: "Inter", "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}
html[lang="zh-CN"] .mono, html[lang="zh-CN"] .meta-strip, html[lang="zh-CN"] .t-num,
html[lang="zh-CN"] .t-label, html[lang="zh-CN"] .r-num, html[lang="zh-CN"] .r-label,
html[lang="zh-CN"] .c-name, html[lang="zh-CN"] .c-label, html[lang="zh-CN"] .status,
html[lang="zh-CN"] .p-num, html[lang="zh-CN"] .p-sub, html[lang="zh-CN"] .f-micro,
html[lang="zh-CN"] nav.site-nav a, html[lang="zh-CN"] a.text-cta, html[lang="zh-CN"] .go {
  font-family: "IBM Plex Mono", "Noto Sans SC", monospace;
  letter-spacing: 0.06em;
}

/* ---------- scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; } .reveal.d2 { transition-delay: 0.16s; } .reveal.d3 { transition-delay: 0.24s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .grain { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero h1 .line span { transform: none !important; }
  * { transition-duration: 0.01ms !important; }
}

/* ---------- page hero (subpages) ---------- */
.page-hero { padding-top: clamp(140px, 22vh, 220px); padding-bottom: clamp(48px, 8vh, 90px); }
.page-hero h1 { font-weight: 200; font-size: clamp(38px, 6.5vw, 88px); line-height: 1.05; letter-spacing: -0.025em; max-width: 14em; }
.page-hero .mono { display: block; margin-bottom: 28px; }
.page-hero p.lede { margin-top: 32px; }