/* Tubby Labs — site styles. No build step. Order: tokens, base, chrome, hero, sections, components, responsive. */

:root {
  /* Light surfaces */
  --paper: #F3F5F8;
  --paper-2: #E8EDF3;
  --card: #FFFFFF;
  --ink: #0B1628;
  --ink-2: #37475B;
  --ink-3: #5A6A7D;
  --rule: #D3DCE5;
  --rule-soft: #E1E7EE;
  --long: #B07A05;
  --short: #2F55C9;
  --teal: #0F7A6E;
  --focus: #2F55C9;
  /* Night surfaces (hero and ink sections stay dark in both themes) */
  --night: #081223;
  --night-2: #0D1B30;
  --night-ink: #EEF3F8;
  --night-ink-2: #A9B9CC;
  --night-ink-3: #8295AB;
  --night-rule: rgba(255, 255, 255, 0.1);
  --long-night: #D3A23C;
  --short-night: #7690EC;
  --gold: #F2B632;
  --gold-soft: #FFD37A;
  /* Type and rhythm */
  --serif: "Source Serif 4", "Noto Serif SC", "Songti SC", Georgia, serif;
  --sans: "IBM Plex Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --wrap: 1200px;
  --gutter: clamp(18px, 4.5vw, 48px);
  --space: clamp(96px, 12vw, 168px);
  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 .55 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #070F1C;
    --paper-2: #0B1627;
    --card: #0F1D31;
    --ink: #E8EEF5;
    --ink-2: #B3C2D3;
    --ink-3: #8799AE;
    --rule: #22344B;
    --rule-soft: #18283C;
    --long: #BE8820;
    --short: #5C7AE0;
    --teal: #3FB3A3;
    --focus: #8FA7F5;
    --night: #040B17;
    --night-2: #0A1628;
    color-scheme: dark;
  }
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.65 var(--sans);
  font-feature-settings: "kern", "liga";
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
html.i18n-pending body { opacity: 0; animation: reveal 0s linear 1.2s forwards; }
@keyframes reveal { to { opacity: 1; } }
img, svg, canvas { display: block; }
a { color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 400; }
p, ul, ol, dl, dd, figure, pre { margin: 0; }
code, pre { font-family: var(--mono); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 6px; }
.wrap { width: 100%; max-width: calc(var(--wrap) + 2 * var(--gutter)); margin: 0 auto; padding: 0 var(--gutter); }
.skip { position: fixed; left: 12px; top: 12px; padding: 10px 14px; background: var(--gold); color: #0B1628; border-radius: 8px; z-index: 50; text-decoration: none; font-weight: 600; opacity: 0; pointer-events: none; transform: translateY(-8px); }
.skip:focus { opacity: 1; pointer-events: auto; transform: none; }

html[data-lang="zh"] body { line-height: 1.85; letter-spacing: 0.01em; }

/* Masthead: floats over the dark hero, turns into paper glass over light sections */
.masthead {
  position: fixed; inset: 0 0 auto 0; z-index: 30;
  color: var(--ink);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(170%) blur(16px);
  -webkit-backdrop-filter: saturate(170%) blur(16px);
  border-bottom: 1px solid var(--rule-soft);
  transition: background 240ms ease, border-color 240ms ease, color 240ms ease;
}
.masthead.on-dark { color: var(--night-ink); background: rgba(6, 14, 28, 0.35); border-bottom-color: transparent; }
.masthead.on-dark.is-scrolled { background: rgba(6, 14, 28, 0.62); border-bottom-color: var(--night-rule); }
.masthead-row { display: flex; align-items: center; gap: 32px; height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; margin-right: auto; }
.brand-mark { width: 32px; height: 32px; border-radius: 9px; box-shadow: 0 4px 14px rgba(15, 122, 110, 0.35); }
.brand-name { font: 600 1.08rem/1 var(--sans); letter-spacing: -0.012em; white-space: nowrap; }
.nav-list { display: flex; gap: 30px; list-style: none; padding: 0; margin: 0; }
.nav-list a { text-decoration: none; font-size: 0.94rem; opacity: 0.78; padding: 6px 0; white-space: nowrap; transition: opacity 150ms ease; }
.nav-list a:hover { opacity: 1; }
.nav-toggle { display: none; }
.masthead-cta {
  display: inline-flex; align-items: center; min-height: 36px; padding: 0 16px; border-radius: 999px;
  font: 500 0.86rem/1 var(--sans); text-decoration: none; color: #0B1628; background: var(--gold);
  box-shadow: 0 8px 22px -10px rgba(242, 182, 50, 0.7); transition: background 150ms ease, transform 150ms ease;
}
.masthead-cta:hover { background: var(--gold-soft); }
.masthead-cta:active { transform: translateY(1px); }
.lang { display: inline-flex; border: 1px solid var(--rule); border-radius: 999px; padding: 3px; }
.on-dark .lang { border-color: rgba(255, 255, 255, 0.2); }
.lang button {
  font: 500 0.8rem/1 var(--sans); color: inherit; opacity: 0.7; background: none; border: 0;
  padding: 7px 11px; border-radius: 999px; cursor: pointer; transition: background 150ms ease, opacity 150ms ease, color 150ms ease;
}
.lang button:hover { opacity: 1; }
.lang button[aria-pressed="true"] { opacity: 1; background: var(--ink); color: var(--paper); }
.on-dark .lang button[aria-pressed="true"] { background: var(--night-ink); color: var(--night); }

/* Buttons */
.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px;
  border-radius: 999px; font: 500 0.98rem/1 var(--sans); text-decoration: none; white-space: nowrap;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}
.button:active { transform: translateY(1px); }
.button-gold { background: var(--gold); color: #0B1628; box-shadow: 0 10px 30px -10px rgba(242, 182, 50, 0.6); }
.button-gold:hover { background: var(--gold-soft); box-shadow: 0 14px 40px -10px rgba(242, 182, 50, 0.75); }
.button-glass { color: var(--night-ink); background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.18); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.button-glass:hover { background: rgba(255, 255, 255, 0.11); border-color: rgba(255, 255, 255, 0.3); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 40px; }

/* Shared night material */
.hero, .section-ink { position: relative; background: var(--night); color: var(--night-ink); isolation: isolate; overflow: hidden; }
.hero::after, .section-ink::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: var(--grain); opacity: 0.05; mix-blend-mode: overlay;
}
.section-ink::before {
  content: ""; position: absolute; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(55% 60% at 88% 0%, rgba(42, 74, 163, 0.35), transparent 70%),
    radial-gradient(45% 55% at 0% 100%, rgba(15, 122, 110, 0.28), transparent 70%);
}
.section-ink :focus-visible, .hero :focus-visible { outline-color: var(--gold); }

/* Hero */
.hero { padding-top: calc(72px + clamp(64px, 10vw, 136px)); }
.hero-light {
  position: absolute; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(52% 46% at 82% 8%, rgba(42, 74, 163, 0.55), transparent 72%),
    radial-gradient(44% 50% at 6% 72%, rgba(15, 122, 110, 0.36), transparent 72%),
    radial-gradient(30% 26% at 62% 58%, rgba(242, 182, 50, 0.09), transparent 70%),
    linear-gradient(180deg, #0A1830 0%, var(--night) 60%);
}
.eyebrow { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 22px; font: 500 0.8rem/1 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; color: var(--gold-soft); }
.eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--gold); }
html[data-lang="zh"] .eyebrow { letter-spacing: 0.18em; }
.hero h1 {
  max-width: 20ch;
  font: 400 clamp(3rem, 7.4vw, 6.5rem)/0.98 var(--serif);
  font-optical-sizing: auto;
  letter-spacing: -0.032em;
  text-wrap: balance;
  background: linear-gradient(180deg, #FFFFFF 10%, #C3D0DF 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
html[data-lang="zh"] .hero h1 { font-weight: 600; line-height: 1.14; letter-spacing: 0.04em; max-width: 11em; }
.lede { margin-top: 32px; max-width: 58ch; font-size: clamp(1.08rem, 1.45vw, 1.24rem); line-height: 1.6; color: var(--night-ink-2); text-wrap: pretty; }
html[data-lang="zh"] .lede { max-width: 36em; line-height: 1.9; }

/* The instrument: full-bleed chart with a glass weights panel */
.instrument { margin-top: clamp(64px, 9vw, 112px); }
.stage {
  position: relative; height: clamp(360px, 42vw, 580px); cursor: ew-resize; touch-action: pan-y;
  border-top: 1px solid var(--night-rule); border-bottom: 1px solid var(--night-rule);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
}
.stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.asof-future {
  position: absolute; top: 0; bottom: 0; right: 0;
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.035) 0 1px, transparent 1px 11px),
    linear-gradient(90deg, rgba(8, 18, 35, 0.35), rgba(8, 18, 35, 0.78));
  display: flex; align-items: flex-end; padding: 0 0 18px 18px;
  font-size: 0.8rem; color: var(--night-ink-3); pointer-events: none; transition: background 300ms ease;
}
.instrument.show-future .asof-future { background: repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0 1px, transparent 1px 11px); }
.asof-line { position: absolute; top: 0; bottom: 0; width: 0; border-left: 1.5px solid rgba(255, 255, 255, 0.92); box-shadow: 0 0 22px 1px rgba(242, 182, 50, 0.35); pointer-events: none; }
.asof-line::before { content: ""; position: absolute; top: 22px; left: -8px; width: 13px; height: 13px; border-radius: 50%; background: var(--gold); border: 2px solid var(--night); box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.9), 0 0 18px 4px rgba(242, 182, 50, 0.55); }
.asof-day { position: absolute; top: 16px; left: 14px; white-space: nowrap; font: 500 0.8rem/1 var(--sans); font-variant-numeric: tabular-nums; background: rgba(238, 243, 248, 0.95); color: #0B1628; padding: 6px 9px; border-radius: 7px; }
.asof-line.is-left-label .asof-day { left: auto; right: 14px; }

.stage-overlay { position: absolute; inset: 0; left: 50%; transform: translateX(-50%); display: flex; justify-content: flex-end; align-items: center; pointer-events: none; }
.glass {
  background: rgba(10, 22, 42, 0.58);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 40px 90px -30px rgba(0, 0, 0, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.07);
}
.panel { pointer-events: auto; cursor: default; width: 320px; border-radius: 20px; padding: 20px 20px 16px; }
.panel-label { font-size: 0.78rem; color: var(--night-ink-3); }
.panel-expr { margin-top: 4px; }
.panel-expr code { font-size: 0.8rem; color: var(--night-ink); white-space: nowrap; }
.panel-note { margin-top: 8px; font-size: 0.8rem; line-height: 1.5; color: var(--night-ink-3); }
html[data-lang="zh"] .panel-note { line-height: 1.7; }
.bars { position: relative; display: flex; flex-direction: column; justify-content: space-between; gap: 2px; height: 176px; margin-top: 16px; }
.bars::before { content: ""; position: absolute; top: -4px; bottom: -4px; left: 50%; border-left: 1px solid rgba(255, 255, 255, 0.2); }
.bar { position: relative; flex: 1; }
.bar i { position: absolute; top: 0; bottom: 0; width: calc(var(--w, 0) * (50% - 2px)); border-radius: 2px; transition: width 280ms cubic-bezier(.2, .7, .2, 1), background 200ms ease; }
.bar.pos i { left: calc(50% + 2px); background: var(--long-night); }
.bar.neg i { right: calc(50% + 2px); background: var(--short-night); }
.bar.is-hot i { background: #FFFFFF; }
.totals { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; padding-top: 14px; border-top: 1px solid rgba(255, 255, 255, 0.1); }
.totals p { display: flex; flex-direction: column; gap: 2px; font-size: 0.8rem; color: var(--night-ink-3); }
.totals strong { font: 400 1.9rem/1.05 var(--serif); color: var(--night-ink); font-variant-numeric: tabular-nums lining-nums; letter-spacing: -0.02em; }
.key { display: inline-flex; align-items: center; gap: 7px; }
.key::before { content: ""; width: 14px; height: 3px; border-radius: 2px; }
.key-long::before { background: var(--long-night); }
.key-short::before { background: var(--short-night); }
.asof-readout { margin-top: 10px; min-height: 2.6em; font-size: 0.8rem; line-height: 1.45; color: var(--night-ink-2); font-variant-numeric: tabular-nums; }

.controls { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 12px 22px; margin-top: 22px; }
.controls-label { font-size: 0.86rem; color: var(--night-ink-3); }
.caption { margin-top: 14px; font-size: 0.88rem; color: var(--night-ink-3); }

.switch { position: relative; display: inline-flex; align-items: center; gap: 10px; font-size: 0.88rem; color: var(--night-ink-2); cursor: pointer; user-select: none; }
.switch input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.switch-track { position: relative; width: 38px; height: 22px; border-radius: 999px; background: rgba(255, 255, 255, 0.16); transition: background 200ms ease; flex: none; }
.switch-track::after { content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%; background: #FFFFFF; transition: transform 200ms cubic-bezier(.2, .7, .2, 1); }
.switch input:checked + .switch-track { background: var(--gold); }
.switch input:checked + .switch-track::after { transform: translateX(16px); }
.switch input:focus-visible + .switch-track { outline: 2px solid var(--gold); outline-offset: 3px; }

input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 30px; background: none; margin: 0; cursor: pointer; }
input[type="range"]::-webkit-slider-runnable-track { height: 2px; background: rgba(255, 255, 255, 0.2); border-radius: 2px; }
input[type="range"]::-moz-range-track { height: 2px; background: rgba(255, 255, 255, 0.2); border-radius: 2px; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; margin-top: -9px; border-radius: 50%; background: var(--gold); border: 3px solid var(--night); box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.85), 0 0 16px rgba(242, 182, 50, 0.55); }
input[type="range"]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--gold); border: 3px solid var(--night); box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.85), 0 0 16px rgba(242, 182, 50, 0.55); }

.facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 32px; margin-top: clamp(72px, 9vw, 120px); padding-bottom: clamp(80px, 10vw, 128px); }
.facts > div { display: flex; flex-direction: column-reverse; justify-content: flex-end; gap: 10px; padding-top: 22px; border-top: 1px solid var(--night-rule); }
.facts dd { font: 300 clamp(2.6rem, 4.6vw, 4rem)/1 var(--serif); letter-spacing: -0.03em; font-variant-numeric: lining-nums tabular-nums; color: var(--night-ink); }
html[data-lang="zh"] .facts dd { letter-spacing: 0; }
.facts dt { font-size: 0.92rem; line-height: 1.5; color: var(--night-ink-3); max-width: 26ch; }
html[data-lang="zh"] .facts dt { line-height: 1.75; }

/* Sections */
.section { padding: var(--space) 0; }
.section-head { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: 20px 64px; align-items: end; margin-bottom: clamp(48px, 7vw, 88px); }
.section-head h2 { font: 400 clamp(2.4rem, 4.8vw, 4rem)/1.02 var(--serif); letter-spacing: -0.028em; text-wrap: balance; }
html[data-lang="zh"] .section-head h2 { font-weight: 600; line-height: 1.22; letter-spacing: 0.04em; }
/* Chinese headings break at punctuation first (一套框架，/多个研究领域), anywhere only when a line overflows. */
html[data-lang="zh"] .section-head h2, html[data-lang="zh"] .oss h2, html[data-lang="zh"] .explorer-title { word-break: keep-all; overflow-wrap: anywhere; }
.section-head p { color: var(--ink-2); max-width: 50ch; text-wrap: pretty; }
.section-ink .section-head h2 { color: var(--night-ink); }
.section-ink .section-head p { color: var(--night-ink-2); }

/* Framework features with illustrations */
.feature { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 40px clamp(40px, 6vw, 88px); align-items: center; padding: clamp(40px, 5vw, 64px) 0; border-top: 1px solid var(--rule); }
.feature-flip .feature-copy { order: 2; }
.feature-copy h3 { font: 400 clamp(1.8rem, 3vw, 2.5rem)/1.1 var(--serif); letter-spacing: -0.02em; }
html[data-lang="zh"] .feature-copy h3 { font-weight: 600; line-height: 1.3; letter-spacing: 0.03em; }
.feature-copy > p { margin-top: 18px; color: var(--ink-2); max-width: 52ch; }
.ticks { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 10px; }
.ticks li { position: relative; padding-left: 30px; font-size: 0.97rem; }
.ticks li::before { content: ""; position: absolute; left: 0; top: 0.3em; width: 18px; height: 18px; border-radius: 50%; background: color-mix(in srgb, var(--teal) 14%, transparent); }
.ticks li::after { content: ""; position: absolute; left: 6px; top: calc(0.3em + 5px); width: 6px; height: 4px; border-left: 1.6px solid var(--teal); border-bottom: 1.6px solid var(--teal); transform: rotate(-45deg); }

.art {
  position: relative; display: grid; place-items: center; min-height: 360px; padding: clamp(24px, 4vw, 56px);
  border-radius: 28px; overflow: hidden; border: 1px solid var(--rule-soft);
  background:
    radial-gradient(70% 60% at 20% 0%, color-mix(in srgb, #2A4AA3 12%, transparent), transparent 70%),
    radial-gradient(60% 60% at 100% 100%, color-mix(in srgb, var(--teal) 12%, transparent), transparent 70%),
    var(--paper-2);
}
.art::after { content: ""; position: absolute; inset: 0; background-image: var(--grain); opacity: 0.05; mix-blend-mode: overlay; pointer-events: none; }
.art-card, .window {
  position: relative; z-index: 1; width: min(100%, 460px);
  background: var(--card); border: 1px solid var(--rule-soft); border-radius: 18px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) inset, 0 32px 70px -30px rgba(11, 22, 40, 0.35), 0 3px 10px rgba(11, 22, 40, 0.06);
}
.art-card { padding: 22px; }
.pill { display: inline-flex; align-items: center; padding: 3px 9px; border-radius: 999px; font-size: 0.72rem; font-weight: 500; color: var(--ink-3); background: var(--paper-2); white-space: nowrap; }
.pill-ok { color: var(--teal); background: color-mix(in srgb, var(--teal) 13%, transparent); }

.file-row { display: flex; align-items: center; gap: 10px; padding-bottom: 16px; border-bottom: 1px solid var(--rule-soft); }
.file-icon { width: 22px; height: 28px; border-radius: 4px; background: linear-gradient(160deg, #2A4AA3, #0F7A6E); position: relative; flex: none; }
.file-icon::after { content: ""; position: absolute; top: 0; right: 0; border-style: solid; border-width: 0 7px 7px 0; border-color: transparent var(--card) rgba(255, 255, 255, 0.45) transparent; }
.file-name { font: 500 0.9rem/1.2 var(--mono); margin-right: auto; }
.hash-row { display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; align-items: center; padding: 14px 0 0; }
.hash-label { grid-column: 1 / -1; font-size: 0.76rem; color: var(--ink-3); }
.hash-row code { font-size: 0.8rem; color: var(--ink); letter-spacing: 0.02em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bitgrid { display: grid; grid-template-columns: repeat(24, 1fr); gap: 3px; margin-top: 20px; }
.bitgrid i { aspect-ratio: 1; border-radius: 2px; background: var(--rule-soft); }
.bitgrid i.on { background: color-mix(in srgb, var(--teal) 70%, transparent); }
.bitgrid i.hi { background: var(--teal); }
.art-foot { margin-top: 14px; font-size: 0.78rem; color: var(--ink-3); }

.balance-bars { display: flex; align-items: center; gap: 5px; height: 190px; position: relative; }
.balance-bars::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 1px solid var(--rule); }
.balance-bars i { flex: 1; border-radius: 3px; }
.balance-bars i.up { align-self: flex-end; margin-bottom: 95px; background: var(--long); }
.balance-bars i.down { align-self: flex-start; margin-top: 95px; background: var(--short); }
.balance-scale { display: flex; justify-content: space-between; gap: 8px; margin-top: 16px; font-size: 0.8rem; color: var(--ink-3); flex-wrap: wrap; }
.balance-tag b { font-weight: 600; color: var(--ink); margin-right: 4px; }
.tag-long b { color: var(--long); }
.tag-short b { color: var(--short); }
.tag-gross { color: var(--ink-2); }
.clock { display: flex; align-items: center; gap: 12px; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--rule-soft); font-size: 0.82rem; color: var(--ink-2); }
.clock-step { display: inline-flex; align-items: center; gap: 8px; }
.clock-step i { width: 9px; height: 9px; border-radius: 50%; background: var(--ink-3); flex: none; }
.clock-open i { background: var(--gold); box-shadow: 0 0 0 3px color-mix(in srgb, var(--gold) 30%, transparent); }
.clock-arrow { flex: 1; min-width: 24px; height: 1px; background: var(--rule); position: relative; }
.clock-arrow::after { content: ""; position: absolute; right: 0; top: -3px; border-left: 6px solid var(--rule); border-top: 3.5px solid transparent; border-bottom: 3.5px solid transparent; }

.window { overflow: hidden; width: min(100%, 520px); }
.window-bar { display: flex; align-items: center; gap: 7px; height: 36px; padding: 0 14px; border-bottom: 1px solid var(--rule-soft); background: color-mix(in srgb, var(--paper-2) 60%, var(--card)); }
.window-bar i { width: 10px; height: 10px; border-radius: 50%; background: #FF5F57; }
.window-bar i:nth-child(2) { background: #FEBC2E; }
.window-bar i:nth-child(3) { background: #28C840; }
.window-bar span { margin-left: 10px; font-size: 0.75rem; color: var(--ink-3); }
.window-body { display: grid; grid-template-columns: 124px minmax(0, 1fr); min-height: 250px; }
.window-side { display: flex; flex-direction: column; gap: 9px; padding: 14px 12px; border-right: 1px solid var(--rule-soft); background: color-mix(in srgb, var(--paper-2) 40%, var(--card)); }
.side-title { font-size: 0.68rem; color: var(--ink-3); margin-bottom: 2px; }
.side-run { display: flex; align-items: center; gap: 8px; padding: 6px 7px; border-radius: 7px; }
.side-run.is-active { background: color-mix(in srgb, var(--short) 10%, transparent); }
.side-run i { width: 7px; height: 7px; border-radius: 50%; flex: none; }
.side-run b { height: 6px; flex: 1; border-radius: 3px; background: var(--rule); }
.dot-gold { background: var(--long); } .dot-blue { background: var(--short); } .dot-teal { background: var(--teal); }
.window-main { padding: 14px; display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.editor { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 10px; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--rule-soft); background: var(--paper); }
.editor code { font-size: 0.74rem; white-space: nowrap; color: var(--ink); }
.tk-num { color: var(--long); } .tk-var { color: var(--short); } .tk-fn { color: var(--teal); } .tk-op { color: var(--ink-3); }
.panes { display: grid; gap: 10px; }
.pane { border: 1px solid var(--rule-soft); border-radius: 10px; padding: 9px 11px 10px; }
.pane p { font-size: 0.68rem; color: var(--ink-3); margin-bottom: 6px; }
.pane svg { width: 100%; height: 64px; }
.pane:last-child svg { height: 34px; }
.eq-line { fill: none; stroke: var(--teal); stroke-width: 2; vector-effect: non-scaling-stroke; }
.eq-area { fill: color-mix(in srgb, var(--teal) 12%, transparent); }
.dd-area { fill: color-mix(in srgb, var(--short) 22%, transparent); }

/* Method: a real sequence with a line that fills as you read */
.track { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 28px; position: relative; }
.track::before, .track::after { content: ""; position: absolute; top: 27px; left: 28px; right: calc((100% - 5 * 28px) / 6 - 28px); height: 1px; background: var(--night-rule); }
.track::after { height: 2px; top: 26.5px; background: linear-gradient(90deg, var(--gold), var(--gold-soft)); transform-origin: left center; box-shadow: 0 0 14px rgba(242, 182, 50, 0.45); }
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .track::after { animation: fill-track linear both; animation-timeline: view(); animation-range: entry 40% cover 50%; }
  }
}
@keyframes fill-track { from { transform: scaleX(0); } to { transform: scaleX(1); } }
.track li { position: relative; }
.step-icon {
  position: relative; z-index: 1; width: 56px; height: 56px; padding: 13px; border-radius: 50%;
  fill: none; stroke: var(--night-ink); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
  background: var(--night-2); border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 0 0 6px var(--night);
}
.track h3 { margin-top: 26px; font: 600 1.02rem/1.35 var(--sans); color: var(--night-ink); }
.track p { margin-top: 8px; font-size: 0.93rem; color: var(--night-ink-2); }

/* Principles */
.principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 clamp(32px, 4vw, 56px); }
.principle { padding: 30px 0 40px; border-top: 1px solid var(--rule); }
.principle h3 { font: 400 clamp(1.45rem, 2.1vw, 1.8rem)/1.2 var(--serif); letter-spacing: -0.015em; }
html[data-lang="zh"] .principle h3 { font-weight: 600; letter-spacing: 0.03em; line-height: 1.35; }
.principle p { margin-top: 12px; color: var(--ink-2); }

/* Open source */
.oss { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 48px clamp(40px, 6vw, 88px); align-items: center; }
.oss h2 { font: 400 clamp(2.4rem, 4.6vw, 3.8rem)/1.04 var(--serif); letter-spacing: -0.028em; text-wrap: balance; }
html[data-lang="zh"] .oss h2 { font-weight: 600; line-height: 1.25; letter-spacing: 0.04em; }
.oss-copy > p { margin-top: 22px; color: var(--night-ink-2); max-width: 54ch; }
.terminal {
  border-radius: 18px; overflow: hidden; background: #050C18; border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 50px 100px -40px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.02), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.terminal .window-bar { background: rgba(255, 255, 255, 0.03); border-bottom-color: rgba(255, 255, 255, 0.07); }
.terminal .window-bar span { color: var(--night-ink-3); }
.terminal pre { padding: 22px 24px 26px; overflow-x: auto; font-size: clamp(0.7rem, 1.05vw, 0.84rem); line-height: 1.75; color: #C6D3E1; }
.t-prompt { color: var(--gold); } .t-dim { color: #71849B; } .t-num { color: #E6EDF5; } .t-plus { color: #4CC38A; } .t-sum { color: #A9B9CC; }

/* Roadmap */
.roadmap { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 clamp(32px, 4vw, 56px); position: relative; }
.roadmap li { position: relative; padding-top: 52px; }
.roadmap li::before { content: ""; position: absolute; top: 4px; left: 0; width: 14px; height: 14px; border-radius: 50%; background: var(--paper); border: 1.5px solid var(--ink-3); z-index: 1; }
.roadmap li::after { content: ""; position: absolute; top: 11px; left: 0; right: calc(-1 * clamp(32px, 4vw, 56px)); border-top: 1px dashed var(--rule); }
.roadmap li:last-child::after { right: 0; }
.roadmap li.is-now::before { background: var(--gold); border-color: var(--gold); box-shadow: 0 0 0 5px color-mix(in srgb, var(--gold) 25%, transparent); }
.roadmap li.is-now::after { border-top: 2px solid var(--ink); top: 10.5px; }
.roadmap h3 { font: 400 clamp(1.6rem, 2.4vw, 2.1rem)/1.1 var(--serif); letter-spacing: -0.02em; }
html[data-lang="zh"] .roadmap h3 { font-weight: 600; letter-spacing: 0.04em; }
.roadmap p { margin-top: 12px; color: var(--ink-2); max-width: 40ch; }

/* Footer */
.footer { padding: clamp(56px, 7vw, 88px) 0 40px; border-top: 1px solid var(--rule); background: var(--paper-2); }
.footer-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px; padding-bottom: 36px; }
.footer-tag { font: 400 clamp(1.3rem, 2.4vw, 1.8rem)/1.2 var(--serif); letter-spacing: -0.015em; color: var(--ink-2); }
html[data-lang="zh"] .footer-tag { font-weight: 600; letter-spacing: 0.04em; }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 32px; padding-top: 22px; border-top: 1px solid var(--rule); font-size: 0.88rem; color: var(--ink-3); }
.footer-links { display: flex; gap: 22px; }
.footer-links a { text-underline-offset: 3px; }

/* 404 */
.notfound { min-height: 100vh; display: grid; align-content: center; padding: 96px 0; }
.notfound-title { font: 400 clamp(2.6rem, 6vw, 4.6rem)/1.02 var(--serif); letter-spacing: -0.03em; }
.notfound .lede { color: var(--night-ink-2); }

/* Screenshot feature: real console, synthetic data */
.art-shot { padding: 0; place-items: stretch; min-height: 0; background: var(--paper-2); }
.art-shot img { width: 100%; height: auto; aspect-ratio: 1280 / 696; object-fit: cover; display: block; }
.shot-caption {
  position: absolute; left: 14px; right: 14px; bottom: 14px; z-index: 2; padding: 10px 14px; border-radius: 12px;
  font-size: 0.78rem; line-height: 1.45; color: var(--night-ink); background: rgba(8, 18, 35, 0.82);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border: 1px solid rgba(255, 255, 255, 0.14);
}
.shot-caption::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--gold); margin-right: 8px; vertical-align: 1px; }

/* Ticks on night surfaces */
.ticks-night li { color: var(--night-ink-2); }
.ticks-night li::before { background: rgba(242, 182, 50, 0.16); }
.ticks-night li::after { border-color: var(--gold); }

/* Research pipeline illustration */
.pipe { padding: 22px 22px 18px; }
.pipe-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.pipe-node { display: inline-flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: 999px; border: 1px solid var(--rule); background: var(--paper); font: 500 0.78rem/1 var(--sans); color: var(--ink); white-space: nowrap; }
.pipe-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--teal); flex: none; }
.pipe-arrow { flex: 1; min-width: 14px; height: 1px; background: var(--rule); position: relative; }
.pipe-arrow::after { content: ""; position: absolute; right: 0; top: -3px; border-left: 6px solid var(--rule); border-top: 3.5px solid transparent; border-bottom: 3.5px solid transparent; }
.pipe-branch { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0 12px 20px; padding-left: 14px; border-left: 1px dashed var(--rule); }
.pipe-tag { padding: 5px 10px; border-radius: 999px; font: 500 0.72rem/1 var(--sans); }
.pipe-refine { color: var(--short); background: color-mix(in srgb, var(--short) 12%, transparent); }
.pipe-reject { color: var(--ink-3); background: var(--paper-2); }
.pipe-promote { color: var(--teal); background: color-mix(in srgb, var(--teal) 13%, transparent); }
.pipe-final { margin-top: 2px; }
.pipe-lock { border-color: color-mix(in srgb, var(--long) 55%, transparent); background: color-mix(in srgb, var(--long) 10%, var(--paper)); color: var(--ink); }
.pipe-lock svg { width: 15px; height: 15px; fill: none; stroke: var(--long); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* The research loop on paper */
.loop { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; counter-reset: loop; }
.loop li { position: relative; padding: 24px 24px 26px; border-radius: 20px; border: 1px solid var(--rule-soft); background: var(--card); box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) inset, 0 20px 50px -34px rgba(11, 22, 40, 0.35); }
.loop-no { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; border-radius: 50%; font: 500 0.85rem/1 var(--mono); color: var(--ink-2); background: var(--paper-2); }
.loop h3 { margin-top: 16px; font: 600 1.06rem/1.35 var(--sans); }
.loop p { margin-top: 8px; font-size: 0.94rem; color: var(--ink-2); }
.loop-lock { border-color: color-mix(in srgb, var(--long) 45%, var(--rule-soft)); background: linear-gradient(180deg, color-mix(in srgb, var(--long) 7%, var(--card)), var(--card)); }
.loop-lock .loop-no { background: color-mix(in srgb, var(--long) 16%, transparent); }
.loop-lock .loop-no svg { width: 17px; height: 17px; fill: none; stroke: var(--long); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.guarantees { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 clamp(32px, 4vw, 56px); margin-top: clamp(40px, 5vw, 64px); }
.guarantee { padding: 22px 0 8px; border-top: 1px solid var(--rule); }
.guarantee h3 { font: 400 1.35rem/1.25 var(--serif); letter-spacing: -0.012em; }
html[data-lang="zh"] .guarantee h3 { font-weight: 600; letter-spacing: 0.03em; }
.guarantee p { margin-top: 10px; font-size: 0.95rem; color: var(--ink-2); }

/* Get started */
.start { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); gap: 48px clamp(40px, 6vw, 88px); align-items: start; }
.section-head-stack { grid-template-columns: minmax(0, 1fr); margin-bottom: 32px; }
.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; display: grid; gap: 14px; }
.steps li { position: relative; padding-left: 44px; font-size: 0.97rem; color: var(--ink-2); counter-increment: step; }
.steps li::before { content: counter(step); position: absolute; left: 0; top: 0.05em; width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; font: 500 0.78rem/1 var(--mono); color: var(--ink); background: var(--paper-2); border: 1px solid var(--rule-soft); }
.steps b { font-weight: 600; color: var(--ink); }
.start-note { margin-top: 26px; padding: 14px 16px; border-radius: 12px; font-size: 0.86rem; line-height: 1.55; color: var(--ink-2); background: var(--paper-2); border-left: 3px solid var(--gold); }
.terminal-paper { box-shadow: 0 40px 80px -40px rgba(11, 22, 40, 0.5), 0 0 0 1px rgba(11, 22, 40, 0.06); }
.section-rule { border-top: 1px solid var(--rule); }
.t-key { color: #8FC9FF; }
.oss .ticks { margin-top: 22px; }

/* Lab: one harness, many domains */
.kicker { margin-bottom: 18px; }
.pill-new, .pill-teal { gap: 7px; padding: 5px 11px; font-size: 0.76rem; letter-spacing: 0.01em; }
.pill-new { color: var(--long); background: color-mix(in srgb, var(--long) 12%, transparent); }
.pill-new::before, .pill-teal::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.pill-teal { color: var(--teal); background: color-mix(in srgb, var(--teal) 12%, transparent); }
.hub {
  position: relative; display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); align-items: center;
  padding: clamp(22px, 4vw, 48px); border-radius: 28px; border: 1px solid var(--rule-soft); overflow: hidden;
  background:
    radial-gradient(60% 70% at 0% 0%, color-mix(in srgb, #2A4AA3 10%, transparent), transparent 70%),
    radial-gradient(50% 60% at 100% 100%, color-mix(in srgb, var(--teal) 10%, transparent), transparent 70%),
    var(--paper-2);
}
.hub::after { content: ""; position: absolute; inset: 0; background-image: var(--grain); opacity: 0.05; mix-blend-mode: overlay; pointer-events: none; }
.hub-core {
  position: relative; z-index: 1; padding: 26px 26px 18px; border-radius: 22px; color: var(--night-ink);
  background: linear-gradient(165deg, #0E2140, var(--night) 70%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 30px 70px -32px rgba(8, 18, 35, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.hub-label { font: 500 0.74rem/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--gold-soft); }
.hub-parts { list-style: none; padding: 0; margin: 16px 0 0; }
.hub-parts li { position: relative; padding: 11px 0 11px 22px; font-size: 0.94rem; color: var(--night-ink-2); border-top: 1px solid var(--night-rule); }
.hub-parts li::before { content: ""; position: absolute; left: 0; top: 50%; width: 8px; height: 8px; margin-top: -4px; border-radius: 2px; background: var(--teal); box-shadow: 0 0 0 3px rgba(15, 122, 110, 0.25); }
.hub-domains { --reach: clamp(30px, 5vw, 72px); --rail: clamp(14px, 2.4vw, 34px); position: relative; z-index: 1; display: grid; gap: 14px; padding-left: var(--reach); }
.hub-domains::before { content: ""; position: absolute; left: var(--rail); top: 34px; bottom: 34px; border-left: 1px dashed color-mix(in srgb, var(--ink-3) 55%, transparent); }
.hub-domains::after { content: ""; position: absolute; left: 0; top: 50%; width: var(--rail); border-top: 1px dashed color-mix(in srgb, var(--ink-3) 55%, transparent); }
.hub-domain {
  position: relative; display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 3px 16px; align-items: center;
  padding: 16px 18px; border-radius: 16px; text-decoration: none; color: var(--ink);
  background: var(--card); border: 1px solid var(--rule-soft);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) inset, 0 18px 40px -30px rgba(11, 22, 40, 0.45);
  transition: transform 200ms cubic-bezier(.2, .7, .2, 1), border-color 200ms ease, box-shadow 200ms ease;
}
.hub-domain::before { content: ""; position: absolute; top: 50%; right: 100%; width: calc(var(--reach) - var(--rail)); border-top: 1px dashed color-mix(in srgb, var(--ink-3) 55%, transparent); }
a.hub-domain:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--teal) 45%, var(--rule-soft)); box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) inset, 0 26px 50px -28px rgba(11, 22, 40, 0.5); }
.hub-glyph { grid-row: span 2; display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; font: 400 1.35rem/1 var(--serif); color: #FFFFFF; }
.hub-glyph-alpha { background: linear-gradient(160deg, #2A4AA3, #0F7A6E); }
.hub-glyph-ml { background: linear-gradient(160deg, #0F7A6E, #B07A05); }
.hub-name { font: 600 1.02rem/1.3 var(--sans); }
.hub-what { font-size: 0.88rem; line-height: 1.45; color: var(--ink-3); }
.hub-domain-open { background: transparent; border-style: dashed; border-color: color-mix(in srgb, var(--ink-3) 45%, transparent); box-shadow: none; }
.hub-domain-open .hub-glyph { color: var(--ink-3); background: var(--paper); border: 1px dashed color-mix(in srgb, var(--ink-3) 55%, transparent); font-family: var(--sans); }
.hub-domain-open .hub-name { color: var(--ink-2); }
.hub-caption { position: relative; z-index: 1; grid-column: 1 / -1; margin-top: 24px; font-size: 0.86rem; color: var(--ink-3); }
.rules { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0 clamp(28px, 3.4vw, 48px); margin-top: clamp(48px, 6vw, 72px); }
.rule { padding: 26px 0 8px; border-top: 1px solid var(--rule); }
.rule h3 { font: 400 1.38rem/1.25 var(--serif); letter-spacing: -0.012em; }
html[data-lang="zh"] .rule h3 { font-weight: 600; letter-spacing: 0.03em; line-height: 1.4; }
.rule p { margin-top: 10px; font-size: 0.95rem; color: var(--ink-2); }

/* Domain: autonomous alpha discovery */
.discovery { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 48px clamp(40px, 6vw, 88px); align-items: start; }
.minor { font: 600 1.06rem/1.35 var(--sans); color: var(--night-ink); }
.discovery-copy .ticks { margin-top: 16px; }
.cascade-steps { list-style: none; padding: 0; margin: 34px 0 0; counter-reset: cstep; display: grid; }
.cascade-steps li { position: relative; display: grid; gap: 3px; padding: 0 0 18px 46px; counter-increment: cstep; }
.cascade-steps li::before {
  content: counter(cstep); position: absolute; left: 0; top: 0; width: 28px; height: 28px; border-radius: 50%;
  display: grid; place-items: center; font: 500 0.76rem/1 var(--mono); color: var(--night-ink);
  background: var(--night-2); border: 1px solid rgba(255, 255, 255, 0.18);
}
.cascade-steps li::after { content: ""; position: absolute; left: 13.5px; top: 30px; bottom: 2px; border-left: 1px solid var(--night-rule); }
.cascade-steps li:last-child { padding-bottom: 0; }
.cascade-steps li:last-child::after { display: none; }
.cascade-steps li:last-child::before { content: ""; background: color-mix(in srgb, var(--gold) 22%, var(--night-2)); border-color: color-mix(in srgb, var(--gold) 60%, transparent); }
.cascade-steps b { font-weight: 600; color: var(--night-ink); }
.cascade-steps span { font-size: 0.93rem; color: var(--night-ink-2); }

.explorer { border-radius: 24px; padding: clamp(20px, 2.6vw, 30px); }
.explorer-kicker { font: 500 0.74rem/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--gold-soft); }
.explorer-title { margin-top: 12px; font: 400 clamp(1.45rem, 2.4vw, 1.9rem)/1.15 var(--serif); letter-spacing: -0.015em; color: var(--night-ink); }
html[data-lang="zh"] .explorer-title { font-weight: 600; letter-spacing: 0.03em; line-height: 1.35; }
.explorer-chart { margin-top: 18px; }
.explorer-chart svg { width: 100%; height: auto; overflow: visible; }
.explorer-chart .ax { stroke: rgba(255, 255, 255, 0.12); stroke-width: 1; }
.explorer-chart .ax-text { fill: var(--night-ink-3); font: 400 11px var(--mono); }
.explorer-chart .ax-title { fill: var(--night-ink-3); font: 500 11px var(--sans); }
.explorer-chart .curve-faint { fill: none; stroke: rgba(255, 255, 255, 0.16); stroke-width: 1.2; }
.explorer-chart .curve-luck { fill: none; stroke: var(--short-night); stroke-width: 2.4; stroke-linecap: round; }
.explorer-chart .area-luck { fill: rgba(118, 144, 236, 0.13); }
.explorer-chart .curve-bar { fill: none; stroke: var(--gold); stroke-width: 2; stroke-dasharray: 6 5; stroke-linecap: round; }
.explorer-chart .guide { stroke: rgba(255, 255, 255, 0.4); stroke-width: 1; stroke-dasharray: 2 4; }
.explorer-chart .dot-luck { fill: var(--short-night); stroke: var(--night); stroke-width: 2.5; }
.explorer-chart .dot-bar { fill: var(--gold); stroke: var(--night); stroke-width: 2.5; }
.explorer-chart .tag { font: 500 12px var(--sans); }
.explorer-chart .tag-luck { fill: #B8C6F4; }
.explorer-chart .tag-bar { fill: var(--gold-soft); }
.explorer-controls { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 12px 20px; margin-top: 18px; }
.explorer-label { display: inline-flex; align-items: baseline; gap: 8px; font-size: 0.86rem; color: var(--night-ink-3); white-space: nowrap; }
.explorer-label output { font: 500 0.95rem/1 var(--mono); color: var(--night-ink); min-width: 4.5ch; font-variant-numeric: tabular-nums; }
.segmented { display: inline-flex; justify-self: start; border: 1px solid rgba(255, 255, 255, 0.18); border-radius: 999px; padding: 3px; }
.segmented button {
  font: 500 0.82rem/1 var(--sans); color: var(--night-ink-2); background: none; border: 0; padding: 8px 13px; border-radius: 999px;
  cursor: pointer; transition: background 150ms ease, color 150ms ease;
}
.segmented button:hover { color: var(--night-ink); }
.segmented button[aria-pressed="true"] { background: var(--night-ink); color: var(--night); }
.explorer-readout { margin-top: 18px; min-height: 3.2em; font-size: 0.98rem; line-height: 1.55; color: var(--night-ink); font-variant-numeric: tabular-nums; text-wrap: pretty; }
.explorer-readout strong { font-weight: 600; }
.explorer-readout .luck { color: #B8C6F4; }
.explorer-readout .bar { color: var(--gold-soft); }
.explorer-legend { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 14px; font-size: 0.8rem; color: var(--night-ink-3); }
.lg { display: inline-flex; align-items: center; gap: 9px; }
.lg::before { content: ""; width: 22px; height: 0; border-top: 2.4px solid var(--short-night); }
.lg-bar::before { border-top: 2px dashed var(--gold); }
.explorer-note { margin-top: 12px; padding-top: 12px; border-top: 1px solid rgba(255, 255, 255, 0.08); font-size: 0.78rem; line-height: 1.5; color: var(--night-ink-3); }
.facts-lab { margin-top: clamp(64px, 8vw, 104px); padding-bottom: 0; }
.caption-lab { margin-top: 22px; max-width: 80ch; }

/* Domain: machine learning */
.art-cascade { min-height: 0; }
.cascade { display: grid; gap: 16px; padding: 22px 22px 18px; }
.cascade-row { display: grid; grid-template-columns: 104px minmax(0, 1fr); gap: 16px; align-items: center; padding-bottom: 16px; border-bottom: 1px solid var(--rule-soft); }
.cascade-label { display: grid; gap: 3px; font: 600 0.86rem/1.2 var(--sans); }
.cascade-sub { font: 400 0.72rem/1.3 var(--sans); color: var(--ink-3); }
.chips { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 5px; }
.chips-wide { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 8px; }
.chips-final { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 8px; }
.chips i {
  display: block; aspect-ratio: 1; border-radius: 5px; background: var(--chip, var(--ink-3));
  transition: opacity 420ms ease var(--d, 0ms), transform 420ms cubic-bezier(.2, .7, .2, 1) var(--d, 0ms), box-shadow 300ms ease var(--d, 0ms);
}
.chips-wide i, .chips-final i { border-radius: 8px; }
.cascade:not(.is-live) .chips i { opacity: 0; transform: scale(0.55); }
.cascade.is-settled #chips-screen i:not(.keep) { opacity: 0.22; }
.cascade.is-settled #chips-screen i.keep { box-shadow: 0 0 0 2px var(--card), 0 0 0 3.5px var(--chip); }
.chips-wide i.win { box-shadow: 0 0 0 2px var(--card), 0 0 0 4px var(--gold); }
.chips-final i { position: relative; box-shadow: 0 0 0 2px var(--card), 0 0 0 4px var(--gold); }
.chips-final i::after {
  content: ""; position: absolute; inset: 28%; border-radius: 3px;
  background: no-repeat center / contain url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='5' y='10' width='14' height='10' rx='2'/%3E%3Cpath d='M8 10V7a4 4 0 0 1 8 0v3'/%3E%3C/svg%3E");
}
.chips-final .ghost { background: transparent; box-shadow: none; border: 1px dashed var(--rule); }
.chips-final .ghost::after { display: none; }
.cascade-final { border-bottom: 0; padding-bottom: 4px; }
.cascade-key { display: flex; flex-wrap: wrap; gap: 8px 16px; padding-top: 2px; font-size: 0.74rem; color: var(--ink-3); }
.cascade-key > span { display: inline-flex; align-items: center; gap: 6px; }
.chip-dot { width: 10px; height: 10px; border-radius: 3px; background: var(--chip); }
.chip-gb { --chip: var(--short); } .chip-rf { --chip: var(--teal); } .chip-nn { --chip: var(--long); } .chip-lin { --chip: #7A8799; }
.answers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: clamp(40px, 5vw, 64px); }
.answer { padding: 24px 24px 26px; border-radius: 20px; border: 1px solid var(--rule-soft); background: var(--card); box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) inset, 0 20px 50px -34px rgba(11, 22, 40, 0.35); }
.answer-task { font: 500 0.78rem/1 var(--mono); color: var(--teal); }
.answer h3 { margin-top: 14px; font: 400 1.32rem/1.25 var(--serif); letter-spacing: -0.012em; }
html[data-lang="zh"] .answer h3 { font-weight: 600; letter-spacing: 0.03em; }
.answer p:last-child { margin-top: 10px; font-size: 0.95rem; color: var(--ink-2); }

/* Responsive */
@media (max-width: 1240px) {
  .nav-list { gap: 22px; }
  .masthead-row { gap: 24px; }
}
/* Seven sections no longer fit beside the brand and language switch: use the compact menu. */
@media (max-width: 1120px) {
  .nav { order: 3; }
  .nav-toggle { display: inline-flex; font: 500 0.86rem/1 var(--sans); color: inherit; background: none; border: 1px solid currentColor; border-radius: 999px; padding: 9px 14px; cursor: pointer; opacity: 0.85; }
  .nav-list { display: none; position: absolute; top: 72px; left: 0; right: 0; flex-direction: column; gap: 0; padding: 8px var(--gutter) 18px; background: var(--paper); color: var(--ink); border-bottom: 1px solid var(--rule); }
  .on-dark .nav-list { background: #0A1628; color: var(--night-ink); border-bottom-color: var(--night-rule); }
  .nav-list.is-open { display: flex; }
  .nav-list a { display: block; padding: 13px 0; font-size: 1.04rem; opacity: 1; }
}
@media (max-width: 1080px) {
  .stage { height: auto; border-bottom: 0; }
  .stage::before { content: ""; display: block; height: clamp(300px, 52vw, 460px); }
  .stage canvas, .asof-future, .asof-line { height: clamp(300px, 52vw, 460px); bottom: auto; }
  .stage-overlay { position: static; transform: none; display: block; padding-top: 18px; }
  .panel { width: 100%; }
  .bars { flex-direction: row; align-items: stretch; height: 120px; }
  .bars::before { top: 50%; bottom: auto; left: -4px; right: -4px; border-left: 0; border-top: 1px solid rgba(255, 255, 255, 0.2); }
  .bar i { left: 0; right: 0; top: auto; bottom: auto; width: auto; height: calc(var(--w, 0) * (50% - 2px)); transition: height 280ms cubic-bezier(.2, .7, .2, 1); }
  .bar.pos i { left: 0; bottom: calc(50% + 2px); }
  .bar.neg i { right: 0; top: calc(50% + 2px); }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 40px; }
  .track { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 48px; }
  .track::before, .track::after { display: none; }
  .principles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .loop { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .start { grid-template-columns: minmax(0, 1fr); }
  .masthead-cta { display: none; }
  .rules { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .discovery { grid-template-columns: minmax(0, 1fr); }
  .answers { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 760px) {
  body { font-size: 1rem; }
  .masthead-row { gap: 12px; height: 64px; }
  .nav { order: 3; }
  .nav-toggle { display: inline-flex; font: 500 0.86rem/1 var(--sans); color: inherit; background: none; border: 1px solid currentColor; border-radius: 999px; padding: 9px 14px; cursor: pointer; opacity: 0.85; }
  .nav-list { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; gap: 0; padding: 8px var(--gutter) 18px; background: var(--paper); color: var(--ink); border-bottom: 1px solid var(--rule); }
  .on-dark .nav-list { background: #0A1628; color: var(--night-ink); border-bottom-color: var(--night-rule); }
  .nav-list.is-open { display: flex; }
  .nav-list a { display: block; padding: 13px 0; font-size: 1.04rem; opacity: 1; }
  .hero { padding-top: calc(64px + 56px); }
  .controls { grid-template-columns: minmax(0, 1fr); }
  .section-head, .feature, .oss { grid-template-columns: minmax(0, 1fr); }
  .feature-flip .feature-copy { order: 0; }
  .art { min-height: 0; border-radius: 22px; }
  .facts { grid-template-columns: minmax(0, 1fr); }
  .track { grid-template-columns: minmax(0, 1fr); row-gap: 32px; }
  .track li { display: grid; grid-template-columns: 56px minmax(0, 1fr); column-gap: 18px; }
  .track .step-icon { grid-row: span 2; }
  .track h3 { margin-top: 4px; }
  .principles, .roadmap, .loop, .guarantees { grid-template-columns: minmax(0, 1fr); }
  .pipe-branch { margin-left: 8px; }
  .roadmap { gap: 36px; }
  .roadmap li { padding: 0 0 0 34px; }
  .roadmap li::before { top: 8px; }
  .roadmap li::after { top: 22px; bottom: -36px; left: 6.5px; right: auto; border-top: 0; border-left: 1px dashed var(--rule); }
  .roadmap li.is-now::after { border-top: 0; border-left: 2px solid var(--ink); left: 6px; top: 22px; }
  .roadmap li:last-child::after { display: none; }
  .window-body { grid-template-columns: minmax(0, 1fr); }
  .window-side { display: none; }
  .hub { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .hub-domains { --reach: 30px; --rail: 14px; margin-top: 26px; }
  .hub-domains::before { top: -26px; bottom: 34px; }
  .hub-domains::after { display: none; }
  .rules { grid-template-columns: minmax(0, 1fr); }
  .explorer-controls { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .cascade-row { grid-template-columns: minmax(0, 1fr); gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0ms !important; }
}