/* Weft 产品与商业路径：沿用首页 / M1 的大尺度、锐边框与证据状态语言。 */
:root {
  --bg: oklch(98% 0.006 78);
  --surface: oklch(100% 0 0);
  --fg: oklch(20% 0.025 246);
  --muted: oklch(49% 0.018 246);
  --border: oklch(88% 0.012 78);
  --line-dark: oklch(34% 0.025 246);
  --dark: oklch(18% 0.026 246);
  --dark-2: oklch(23% 0.025 246);
  --dark-muted: oklch(75% 0.014 246);
  --tool: oklch(57% 0.145 151);
  --tool-dark: oklch(42% 0.12 151);
  --tool-bg: oklch(95% 0.035 151);
  --game: oklch(63% 0.18 43);
  --game-dark: oklch(48% 0.16 41);
  --game-bg: oklch(96% 0.04 55);
  --blue: oklch(55% 0.15 250);
  --blue-bg: oklch(95% 0.035 250);
  --warn: oklch(55% 0.12 78);
  --warn-bg: oklch(96% 0.04 82);
  --danger: oklch(52% 0.18 25);
  --danger-bg: oklch(95% 0.04 25);
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", system-ui, sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--fg);
  background-color: var(--bg);
  background-image:
    linear-gradient(to right, color-mix(in oklch, var(--border) 48%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklch, var(--border) 48%, transparent) 1px, transparent 1px);
  background-size: 32px 32px;
  font: 16px/1.72 var(--sans);
  -webkit-font-smoothing: antialiased;
}
[hidden] { display: none !important; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; font: inherit; }
a { color: inherit; }
button:focus-visible, a:focus-visible, [tabindex]:focus-visible { outline: 3px solid var(--game); outline-offset: 3px; }
.frame { width: min(1400px, calc(100% - 64px)); margin-inline: auto; }
section[id] { scroll-margin-top: 76px; }

/* 顶栏 */
.progress { position: fixed; inset: 0 0 auto; z-index: 100; height: 3px; }
.progress span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--tool), var(--game)); }
.topbar {
  position: sticky; top: 0; z-index: 50; height: 72px;
  display: grid; grid-template-columns: minmax(255px, 1fr) auto minmax(255px, 1fr); align-items: center; gap: 24px;
  padding-inline: max(32px, calc((100vw - 1400px) / 2));
  background: color-mix(in oklch, var(--surface) 93%, transparent);
  border-bottom: 1px solid var(--border); backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font: 650 14px/1 var(--mono); letter-spacing: .06em; }
.brand b { margin-left: 6px; color: var(--muted); font-weight: 500; }
.mark { width: 22px; height: 22px; display: grid; grid-template-columns: 1fr 1fr; gap: 3px; transform: rotate(45deg); }
.mark i { background: var(--fg); }
.mark i:nth-child(2) { background: var(--game); }
.mobile-home { display: none; margin-left: 3px; color: var(--muted); font-size: 10px; }
.nav { display: flex; align-items: center; gap: 25px; font-size: 13px; font-weight: 600; }
.nav a { padding: 12px 0; text-decoration: none; white-space: nowrap; border-bottom: 1px solid transparent; }
.nav a:hover { border-color: var(--fg); }
.stage-tag { justify-self: end; min-height: 40px; display: inline-flex; align-items: center; padding: 0 13px; color: var(--warn); background: var(--warn-bg); border: 1px solid var(--warn); border-radius: 4px; font: 550 11px/1.3 var(--mono); white-space: nowrap; }
.mobile-nav { display: none; position: relative; justify-self: center; }
.mobile-nav summary { min-height: 44px; display: flex; align-items: center; padding: 0 14px; background: var(--surface); border: 1px solid var(--border); border-radius: 4px; cursor: pointer; list-style: none; font: 600 12px/1 var(--mono); }
.mobile-nav summary::-webkit-details-marker { display: none; }
.mobile-nav > div { position: absolute; top: 49px; left: 50%; width: 230px; padding: 8px; transform: translateX(-50%); background: var(--surface); border: 1px solid var(--border); box-shadow: 0 18px 50px color-mix(in oklch, var(--fg) 15%, transparent); }
.mobile-nav a { min-height: 46px; display: flex; align-items: center; padding: 0 12px; text-decoration: none; border-bottom: 1px solid var(--border); font-size: 13px; }
.mobile-nav a:last-child { border-bottom: 0; }

/* 共用标题 */
.eyebrow, .kicker, .panel-label { margin: 0; color: var(--muted); font: 600 11px/1.5 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 56px; margin-bottom: 46px; }
.section-head h2 { margin: 12px 0 0; font: 650 clamp(38px, 4vw, 58px)/1.25 var(--sans); letter-spacing: -.035em; }
.section-head > p { width: min(510px, 42%); margin: 0; color: var(--muted); }
.dark-head .kicker, .dark-head > p { color: var(--dark-muted); }
.section-light { background: color-mix(in oklch, var(--surface) 90%, transparent); border-block: 1px solid var(--border); }

/* 首屏 */
.hero { min-height: 760px; display: grid; grid-template-columns: .96fr 1.04fr; gap: 7%; align-items: center; padding-block: 88px; }
.hero h1 { margin: 18px 0 0; font: 650 clamp(57px, 5.7vw, 86px)/1.12 var(--sans); letter-spacing: -.055em; }
.lead { max-width: 61ch; margin: 28px 0 0; color: var(--muted); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.hero-actions a { min-height: 52px; display: inline-flex; align-items: center; justify-content: center; padding: 0 20px; background: var(--surface); border: 1px solid var(--fg); border-radius: 4px; text-decoration: none; font-weight: 700; }
.hero-actions .primary { min-width: 225px; justify-content: space-between; gap: 28px; color: var(--surface); background: var(--fg); }
.hero-actions .primary:hover { background: var(--game-dark); border-color: var(--game-dark); }
.hero-actions a:not(.primary):hover { background: var(--game-bg); }
.truth-strip { display: flex; flex-wrap: wrap; gap: 10px 20px; margin-top: 32px; padding-top: 23px; border-top: 1px solid var(--border); color: var(--muted); font-size: 12px; }
.truth-strip span { display: inline-flex; align-items: center; gap: 8px; }
.truth-strip i { width: 7px; height: 7px; background: var(--tool); border-radius: 50%; }
.truth-strip span:nth-child(2) i { background: var(--game); }
.truth-strip span:nth-child(3) i { background: var(--danger); }

.ambition-board { position: relative; color: var(--surface); background: var(--dark); border: 1px solid var(--dark); box-shadow: 0 30px 90px color-mix(in oklch, var(--fg) 12%, transparent); }
.ambition-board::before { content: "COMMERCIAL THESIS / EXPLANATORY VIEW"; position: absolute; top: -27px; right: 0; color: var(--muted); font: 10px/1 var(--mono); letter-spacing: .1em; }
.ambition-board > header { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 28px; border-bottom: 1px solid var(--line-dark); }
.ambition-board > header span { color: var(--game); font: 600 10px/1.4 var(--mono); letter-spacing: .1em; }
.ambition-board > header b { font-size: 17px; }
.ambition-main { display: grid; grid-template-columns: 1fr 1fr; }
.ambition-main article { min-height: 290px; display: flex; flex-direction: column; padding: 29px 28px; border-right: 1px solid var(--line-dark); }
.ambition-main article:last-child { border-right: 0; background: var(--dark-2); }
.ambition-main article > span { color: var(--dark-muted); font: 11px/1.4 var(--mono); }
.ambition-main strong { margin-top: auto; font: 650 clamp(52px, 5.5vw, 78px)/1 var(--sans); letter-spacing: -.06em; }
.ambition-main strong sup { color: var(--game); font-size: .43em; }
.ambition-main p { min-height: 50px; margin: 18px 0 0; color: var(--dark-muted); font-size: 13px; }
.ambition-loop { min-height: 77px; display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: center; gap: 10px; padding: 0 28px; color: var(--surface); background: var(--game-dark); font-size: 12px; font-weight: 700; text-align: center; }
.ambition-loop i { font: normal 18px/1 var(--mono); }
.ambition-note { margin: 0; padding: 22px 28px; color: var(--dark-muted); border-top: 1px solid var(--line-dark); font-size: 13px; }
.ambition-note b { color: var(--surface); }

/* 钱从哪来 */
.money { padding-block: 94px; }
.path-switcher { border: 1px solid var(--border); background: var(--surface); box-shadow: 0 24px 80px color-mix(in oklch, var(--fg) 7%, transparent); }
.path-tabs { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--border); }
.path-tabs button { position: relative; min-height: 112px; display: grid; grid-template-columns: 1fr auto; align-content: center; gap: 6px 18px; padding: 20px 25px; text-align: left; background: var(--surface); border: 0; border-right: 1px solid var(--border); cursor: pointer; }
.path-tabs button:last-child { border-right: 0; }
.path-tabs button:hover { background: var(--game-bg); }
.path-tabs button.active { color: var(--surface); background: var(--fg); }
.path-tabs button.active::after { content: ""; position: absolute; inset: auto 0 -1px; height: 4px; background: var(--game); }
.path-tabs span, .path-tabs small { color: var(--muted); font: 10px/1.4 var(--mono); }
.path-tabs button.active span, .path-tabs button.active small { color: var(--dark-muted); }
.path-tabs b { grid-column: 1; font-size: 17px; }
.path-tabs small { grid-row: 1 / 3; grid-column: 2; align-self: center; }
.path-panel { min-height: 430px; display: grid; grid-template-columns: 1.08fr .92fr; }
.path-copy { padding: 44px 46px; }
.path-copy h3 { max-width: 18ch; margin: 12px 0 15px; font: 650 clamp(30px, 3vw, 43px)/1.3 var(--sans); letter-spacing: -.025em; }
.path-copy > p:not(.panel-label) { max-width: 65ch; margin: 0; color: var(--muted); }
.path-copy ul { margin: 28px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--border); }
.path-copy li { min-height: 53px; display: grid; grid-template-columns: 110px 1fr; gap: 18px; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--border); }
.path-copy li b { font-size: 13px; }
.path-copy li span { color: var(--muted); font-size: 13px; }
.path-diagram, .partner-balance, .unknown-board { min-width: 0; border-left: 1px solid var(--border); background: var(--game-bg); }
.path-diagram { display: grid; grid-template-columns: 1fr 32px 1fr 32px 1fr; align-items: center; padding: 42px 28px; }
.path-diagram div { min-width: 0; min-height: 188px; display: flex; flex-direction: column; justify-content: center; padding: 18px; background: var(--surface); border: 1px solid color-mix(in oklch, var(--game) 24%, var(--border)); text-align: center; }
.path-diagram .primary-node { color: var(--surface); background: var(--game-dark); border-color: var(--game-dark); transform: translateY(-12px); box-shadow: 0 18px 35px color-mix(in oklch, var(--game-dark) 25%, transparent); }
.path-diagram div span { color: var(--game-dark); font: 10px/1.4 var(--mono); }
.path-diagram .primary-node span, .path-diagram .primary-node small { color: color-mix(in oklch, var(--surface) 74%, transparent); }
.path-diagram div b { margin: 16px 0 7px; font-size: 17px; }
.path-diagram div small { color: var(--muted); font-size: 11px; }
.path-diagram > i { color: var(--game-dark); font: normal 20px/1 var(--mono); text-align: center; }
.partner-balance { display: grid; grid-template-rows: auto auto auto auto auto 1fr; align-content: center; gap: 12px; padding: 42px; color: var(--surface); background: var(--dark); text-align: center; }
.partner-balance span { color: var(--dark-muted); font: 10px/1.4 var(--mono); letter-spacing: .08em; }
.partner-balance b { min-height: 54px; display: grid; place-items: center; padding: 12px; border: 1px solid var(--line-dark); font-size: 14px; }
.partner-balance i { color: var(--game); font: normal 30px/1 var(--mono); }
.partner-balance em { align-self: end; margin-top: 17px; color: var(--game); font: normal 11px/1.6 var(--mono); }
.unknown-board { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; align-content: center; padding: 42px; background: var(--border); }
.unknown-board > span { grid-column: 1 / -1; display: block; margin-bottom: 20px; color: var(--warn); font: 650 92px/.8 var(--mono); }
.unknown-board p { min-height: 72px; display: grid; place-items: center; margin: 0; padding: 12px; background: var(--surface); font-size: 13px; text-align: center; }
.unknown-board em { grid-column: 1 / -1; margin-top: 20px; color: var(--warn); background: var(--warn-bg); padding: 10px 12px; font: normal 10px/1.4 var(--mono); text-align: center; }
.money-footnotes { display: grid; grid-template-columns: 1fr 1fr; margin-top: 22px; border: 1px solid var(--border); }
.money-footnotes article { min-height: 155px; padding: 25px 28px; background: var(--surface); }
.money-footnotes article + article { border-left: 1px solid var(--border); }
.money-footnotes span { color: var(--muted); font: 10px/1.4 var(--mono); letter-spacing: .08em; }
.money-footnotes b { display: block; margin-top: 8px; font-size: 17px; }
.money-footnotes p { margin: 7px 0 0; color: var(--muted); font-size: 13px; }

/* 市场判断 */
.quality { padding-block: 96px; color: var(--surface); background: var(--dark); }
.thesis-grid { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line-dark); }
.thesis-grid article { min-height: 335px; display: flex; flex-direction: column; padding: 34px; }
.thesis-grid article + article { border-left: 1px solid var(--line-dark); }
.valid-form { background: var(--dark-2); }
.wrong-form { background: color-mix(in oklch, var(--danger) 19%, var(--dark)); }
.quality .panel-label { color: var(--dark-muted); }
.thesis-grid h3 { max-width: 21ch; margin: 20px 0 13px; font: 650 clamp(28px, 2.8vw, 40px)/1.3 var(--sans); }
.thesis-grid article > p:not(.panel-label) { max-width: 62ch; margin: 0; color: var(--dark-muted); }
.thesis-grid article > div { display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; align-items: center; margin-top: auto; padding-top: 24px; border-top: 1px solid var(--line-dark); font: 600 12px/1.5 var(--mono); text-align: center; }
.thesis-grid article > div i { color: var(--game); font: normal 26px/1 var(--mono); }
.wrong-form > div i { color: oklch(75% .16 30); }

.contract-fork { position: relative; display: grid; grid-template-columns: 250px 1fr 1fr; margin-top: 22px; border: 1px solid var(--line-dark); }
.fork-origin { display: flex; flex-direction: column; justify-content: center; padding: 30px; background: var(--game-dark); }
.fork-origin span { color: color-mix(in oklch, var(--surface) 75%, transparent); font: 10px/1.4 var(--mono); }
.fork-origin b { margin-top: 14px; font-size: 22px; line-height: 1.35; }
.contract-fork article { min-height: 255px; display: flex; flex-direction: column; padding: 27px 30px; background: var(--dark-2); border-left: 1px solid var(--line-dark); }
.contract-fork article > span { color: var(--game); font: 10px/1.4 var(--mono); letter-spacing: .08em; }
.contract-fork article h3 { margin: 15px 0 9px; font-size: 23px; line-height: 1.35; }
.contract-fork article p { margin: 0; color: var(--dark-muted); font-size: 14px; }
.contract-fork article em { width: fit-content; margin-top: auto; padding: 6px 9px; color: var(--dark-muted); border: 1px solid var(--line-dark); font: normal 10px/1.4 var(--mono); }

.quality-target { display: grid; grid-template-columns: 1.25fr .75fr; margin-top: 22px; color: var(--fg); background: var(--surface); border-left: 5px solid var(--game); }
.quality-target > div { padding: 38px 42px; }
.quality-target > div > span { color: var(--game-dark); font: 600 10px/1.4 var(--mono); letter-spacing: .1em; }
.quality-target h3 { margin: 14px 0 14px; font: 650 clamp(30px, 3.4vw, 46px)/1.35 var(--sans); letter-spacing: -.025em; }
.quality-target p { max-width: 76ch; margin: 0; color: var(--muted); }
.quality-target ol { display: grid; grid-template-columns: 1fr 1fr; margin: 0; padding: 0; list-style: none; border-left: 1px solid var(--border); }
.quality-target li { min-height: 104px; display: flex; flex-direction: column; justify-content: space-between; padding: 18px; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.quality-target li:nth-last-child(-n + 2) { border-bottom: 0; }
.quality-target li span { color: var(--game-dark); font: 10px/1 var(--mono); }
.quality-target li b { font-size: 14px; }
.thesis-bottom { margin: 22px 0 0; padding: 20px 24px; color: var(--dark-muted); background: var(--dark-2); border: 1px solid var(--line-dark); }
.thesis-bottom b { color: var(--surface); }

/* 创作长板 */
.moat { padding-block: 96px; }
.creative-pipeline { display: grid; grid-template-columns: 1fr 32px 1fr 32px 1fr 32px 1fr; align-items: stretch; }
.creative-pipeline article { min-height: 265px; display: flex; flex-direction: column; padding: 26px; background: var(--surface); border: 1px solid var(--border); }
.creative-pipeline article:nth-of-type(2) { background: var(--tool-bg); }
.creative-pipeline article:nth-of-type(4) { color: var(--surface); background: var(--tool-dark); border-color: var(--tool-dark); }
.creative-pipeline > i { align-self: center; color: var(--tool-dark); font: normal 19px/1 var(--mono); text-align: center; }
.creative-pipeline article > span { color: var(--muted); font: 10px/1.4 var(--mono); letter-spacing: .08em; }
.creative-pipeline article:nth-of-type(4) > span { color: color-mix(in oklch, var(--surface) 70%, transparent); }
.creative-pipeline h3 { margin: auto 0 10px; font-size: 22px; line-height: 1.35; }
.creative-pipeline p { margin: 0; color: var(--muted); font-size: 13px; }
.creative-pipeline article:nth-of-type(4) p { color: color-mix(in oklch, var(--surface) 76%, transparent); }

.moat-layers { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 22px; border: 1px solid var(--border); }
.moat-layers article { min-height: 280px; display: flex; flex-direction: column; padding: 28px; background: var(--surface); border-right: 1px solid var(--border); }
.moat-layers article:last-child { border-right: 0; }
.moat-layers article > span { width: fit-content; padding: 5px 8px; color: var(--tool-dark); background: var(--tool-bg); font: 600 10px/1.4 var(--mono); }
.moat-layers h3 { margin: auto 0 10px; font: 650 24px/1.38 var(--sans); }
.moat-layers p { margin: 0; color: var(--muted); font-size: 13px; }

.comparison { display: grid; grid-template-columns: .72fr 1.28fr; margin-top: 22px; color: var(--surface); background: var(--dark); }
.comparison-intro { padding: 35px; border-right: 1px solid var(--line-dark); }
.comparison-intro > span { color: var(--game); font: 600 10px/1.4 var(--mono); letter-spacing: .08em; }
.comparison-intro h3 { margin: 17px 0 12px; font: 650 31px/1.35 var(--sans); }
.comparison-intro p { margin: 0; color: var(--dark-muted); }
.comparison-table { display: grid; align-content: center; padding: 24px 30px; }
.comparison-table > div { min-height: 68px; display: grid; grid-template-columns: 1.05fr 1.15fr 1.3fr; align-items: center; gap: 18px; padding: 11px 10px; border-bottom: 1px solid var(--line-dark); }
.comparison-table > div:last-child { border-bottom: 0; }
.comparison-table .table-head { min-height: 44px; color: var(--dark-muted); font: 10px/1.4 var(--mono); }
.comparison-table b, .comparison-table span { font-size: 13px; }
.comparison-table span { color: var(--dark-muted); }
.comparison-table .weft-row { background: color-mix(in oklch, var(--tool) 12%, transparent); }
.comparison-table .weft-row b { color: oklch(77% .13 151); }

.implementation-boundary, .presentation-strip { display: grid; grid-template-columns: 210px 1fr; gap: 28px; align-items: start; margin-top: 22px; padding: 23px 28px; background: var(--warn-bg); border-left: 4px solid var(--warn); }
.implementation-boundary > span, .presentation-strip div span { color: var(--warn); font: 600 10px/1.5 var(--mono); letter-spacing: .08em; }
.implementation-boundary p, .presentation-strip p { margin: 0; color: var(--muted); }
.presentation-strip { grid-template-columns: 310px 1fr; background: var(--blue-bg); border-color: var(--blue); }
.presentation-strip div { display: flex; flex-direction: column; gap: 7px; }
.presentation-strip div span { color: var(--blue); }
.presentation-strip div b { font-size: 13px; }

/* 目标与边界 */
.target { padding-block: 96px; color: var(--surface); background: var(--dark); }
.target-equation { min-height: 128px; display: grid; grid-template-columns: auto 28px auto 28px minmax(260px, 1fr) 28px minmax(170px, auto); align-items: center; gap: 12px; padding: 25px 30px; color: var(--fg); background: var(--surface); font-weight: 700; text-align: center; }
.target-equation span, .target-equation b { min-height: 57px; display: grid; place-items: center; padding: 9px 14px; background: var(--bg); border: 1px solid var(--border); }
.target-equation b { color: var(--surface); background: var(--game-dark); border-color: var(--game-dark); }
.target-equation i { color: var(--game-dark); font: normal 24px/1 var(--mono); }
.equation-note { margin: 0; padding: 16px 22px; color: var(--dark-muted); background: var(--dark-2); border: 1px solid var(--line-dark); border-top: 0; font-size: 13px; }
.decision-grid { display: grid; grid-template-columns: 1fr 1fr; margin-top: 22px; border: 1px solid var(--line-dark); }
.decision-grid > article { background: var(--dark-2); }
.decision-grid > article + article { border-left: 1px solid var(--line-dark); }
.decision-grid header { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 0 28px; border-bottom: 1px solid var(--line-dark); }
.decision-grid header span { color: var(--dark-muted); font: 10px/1.4 var(--mono); letter-spacing: .08em; }
.fixed-decisions header b { color: oklch(77% .13 151); }
.open-decisions header b { color: oklch(80% .11 80); }
.decision-grid ul { margin: 0; padding: 0; list-style: none; }
.decision-grid li { min-height: 78px; display: grid; grid-template-columns: 200px 1fr; gap: 20px; align-items: center; padding: 13px 28px; border-bottom: 1px solid var(--line-dark); }
.decision-grid li:last-child { border-bottom: 0; }
.decision-grid li b { font-size: 14px; }
.decision-grid li span { color: var(--dark-muted); font-size: 13px; }
.boundary-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 22px; color: var(--fg); }
.boundary-grid article { min-height: 245px; display: flex; flex-direction: column; padding: 27px; background: var(--surface); border: 1px solid var(--border); border-right: 0; }
.boundary-grid article:last-child { border-right: 1px solid var(--border); }
.boundary-grid article > span { color: var(--muted); font: 10px/1.4 var(--mono); letter-spacing: .08em; }
.boundary-grid h3 { margin: auto 0 10px; font: 650 25px/1.35 var(--sans); }
.boundary-grid p { margin: 0; color: var(--muted); font-size: 13px; }
.closing-note { display: grid; grid-template-columns: 260px 1fr; gap: 36px; align-items: center; margin-top: 22px; padding: 28px 32px; color: var(--surface); background: var(--game-dark); }
.closing-note > span { color: color-mix(in oklch, var(--surface) 70%, transparent); font: 10px/1.5 var(--mono); letter-spacing: .08em; }
.closing-note p { margin: 0; font-size: 17px; }

/* 页脚 */
body > footer { min-height: 150px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 26px; }
body > footer > div:first-child p { margin: 12px 0 0; color: var(--muted); font-size: 12px; }
body > footer > div:nth-child(2) { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 12px 22px; color: var(--muted); font-size: 12px; }
body > footer > div:nth-child(2) a { text-decoration: none; border-bottom: 1px solid transparent; }
body > footer > div:nth-child(2) a:hover { color: var(--fg); border-color: var(--fg); }
.tour-version { flex-basis: 100%; margin: -20px 0 20px; color: var(--muted); font: 11px/1.4 var(--mono); letter-spacing: .03em; }

@media (max-width: 1200px) {
  .topbar { grid-template-columns: 1fr auto 1fr; }
  .nav { display: none; }
  .mobile-nav { display: block; }
  .hero { grid-template-columns: 1fr 1fr; gap: 42px; }
  .path-panel { grid-template-columns: 1fr; }
  .path-diagram, .partner-balance, .unknown-board { min-height: 320px; border-top: 1px solid var(--border); border-left: 0; }
  .creative-pipeline { grid-template-columns: 1fr 20px 1fr; gap: 12px 0; }
  .creative-pipeline article:nth-of-type(3) { grid-column: 1; }
  .creative-pipeline > i:nth-of-type(2) { display: none; }
  .creative-pipeline article:nth-of-type(3) + i { grid-column: 2; }
  .creative-pipeline article:nth-of-type(4) { grid-column: 3; }
}

@media (max-width: 920px) {
  .frame { width: calc(100% - 40px); }
  .section-head { align-items: start; flex-direction: column; gap: 18px; }
  .section-head > p { width: 100%; }
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 78px; padding-block: 88px; }
  .ambition-main strong { font-size: 72px; }
  .path-tabs { grid-template-columns: 1fr; }
  .path-tabs button { min-height: 84px; border-right: 0; border-bottom: 1px solid var(--border); }
  .path-tabs button:last-child { border-bottom: 0; }
  .path-diagram { min-height: 360px; }
  .money-footnotes, .thesis-grid, .quality-target, .moat-layers, .comparison, .decision-grid { grid-template-columns: 1fr; }
  .money-footnotes article + article, .thesis-grid article + article, .decision-grid > article + article { border-left: 0; border-top: 1px solid var(--border); }
  .thesis-grid article + article, .decision-grid > article + article { border-top-color: var(--line-dark); }
  .contract-fork { grid-template-columns: 1fr 1fr; }
  .fork-origin { grid-column: 1 / -1; min-height: 130px; }
  .contract-fork article:first-of-type { border-left: 0; }
  .quality-target ol { border-top: 1px solid var(--border); border-left: 0; }
  .moat-layers article { min-height: 220px; border-right: 0; border-bottom: 1px solid var(--border); }
  .moat-layers article:last-child { border-bottom: 0; }
  .comparison-intro { border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .implementation-boundary, .presentation-strip { grid-template-columns: 1fr; gap: 8px; }
  .target-equation { grid-template-columns: 1fr 30px 1fr; }
  .target-equation span:nth-of-type(3) { grid-column: 1 / -1; }
  .target-equation i:nth-of-type(2) { display: none; }
  .target-equation i:nth-of-type(3) { grid-column: 1 / -1; transform: rotate(90deg); }
  .target-equation b { grid-column: 1 / -1; }
  .boundary-grid { grid-template-columns: 1fr; }
  .boundary-grid article, .boundary-grid article:last-child { min-height: 190px; border-right: 1px solid var(--border); border-bottom: 0; }
  .boundary-grid article:last-child { border-bottom: 1px solid var(--border); }
}

@media (max-width: 620px) {
  body { font-size: 15px; }
  .frame { width: calc(100% - 28px); }
  section[id] { scroll-margin-top: 68px; }
  .topbar { height: 64px; grid-template-columns: 1fr auto; padding-inline: 14px; }
  .brand b { display: none; }
  .mobile-home { display: inline; }
  .mobile-nav { justify-self: end; }
  .mobile-nav > div { left: auto; right: 0; transform: none; }
  .stage-tag { display: none; }
  .hero { padding-block: 70px; gap: 64px; }
  .hero h1 { font-size: clamp(45px, 14vw, 62px); line-height: 1.14; }
  .lead { font-size: 16px; }
  .hero-actions { display: grid; }
  .hero-actions a, .hero-actions .primary { width: 100%; min-width: 0; }
  .truth-strip { display: grid; }
  .ambition-board > header { align-items: start; flex-direction: column; }
  .ambition-main { grid-template-columns: 1fr; }
  .ambition-main article { min-height: 245px; border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .ambition-main article:last-child { border-bottom: 0; }
  .ambition-main strong { font-size: 64px; }
  .ambition-loop { grid-template-columns: 1fr; gap: 6px; padding-block: 18px; }
  .ambition-loop i { transform: rotate(90deg); }
  .money, .quality, .moat, .target { padding-block: 76px; }
  .section-head h2 { font-size: 36px; }
  .path-tabs button { padding-inline: 18px; }
  .path-copy { padding: 30px 22px; }
  .path-copy h3 { font-size: 30px; }
  .path-copy li { grid-template-columns: 1fr; gap: 2px; padding-block: 11px; }
  .path-diagram { min-height: 0; grid-template-columns: 1fr; gap: 9px; padding: 24px 20px; }
  .path-diagram div { min-height: 120px; }
  .path-diagram .primary-node { transform: none; }
  .path-diagram > i { transform: rotate(90deg); }
  .partner-balance, .unknown-board { min-height: 400px; padding: 28px 20px; }
  .money-footnotes article { padding: 23px 21px; }
  .thesis-grid article { min-height: 385px; padding: 28px 22px; }
  .thesis-grid article > div { gap: 8px; }
  .contract-fork { grid-template-columns: 1fr; }
  .fork-origin { grid-column: auto; }
  .contract-fork article { min-height: 265px; border-top: 1px solid var(--line-dark); border-left: 0; }
  .quality-target > div { padding: 30px 22px; }
  .quality-target h3 { font-size: 30px; }
  .quality-target ol { grid-template-columns: 1fr; }
  .quality-target li, .quality-target li:nth-last-child(-n + 2) { min-height: 68px; flex-direction: row; align-items: center; border-bottom: 1px solid var(--border); }
  .quality-target li:last-child { border-bottom: 0; }
  .creative-pipeline { grid-template-columns: 1fr; gap: 0; }
  .creative-pipeline article, .creative-pipeline article:nth-of-type(3), .creative-pipeline article:nth-of-type(4) { grid-column: auto; min-height: 210px; }
  .creative-pipeline > i, .creative-pipeline article:nth-of-type(3) + i { grid-column: auto; min-height: 42px; display: grid; place-items: center; transform: rotate(90deg); }
  .moat-layers article { padding: 24px 22px; }
  .comparison-intro { padding: 28px 22px; }
  .comparison-table { padding: 12px 16px; overflow: visible; }
  .comparison-table .table-head { display: none; }
  .comparison-table > div { min-width: 0; grid-template-columns: 1fr; gap: 4px; padding: 15px 10px; }
  .comparison-table > div span:first-of-type::before { content: "主要优化："; color: var(--game); font: 600 9px/1.4 var(--mono); }
  .comparison-table > div span:last-child::before { content: "仍要补："; color: var(--game); font: 600 9px/1.4 var(--mono); }
  .implementation-boundary, .presentation-strip { padding: 22px; }
  .target-equation { grid-template-columns: 1fr; padding: 22px; }
  .target-equation i, .target-equation span, .target-equation span:nth-of-type(3), .target-equation b { grid-column: auto; }
  .target-equation i:nth-of-type(2) { display: block; }
  .target-equation i, .target-equation i:nth-of-type(3) { transform: rotate(90deg); }
  .decision-grid header { padding-inline: 21px; }
  .decision-grid li { grid-template-columns: 1fr; gap: 2px; padding: 14px 21px; }
  .boundary-grid article { padding: 24px 22px; }
  .closing-note { grid-template-columns: 1fr; gap: 9px; padding: 25px 22px; }
  body > footer { align-items: flex-start; flex-direction: column; justify-content: center; padding-block: 34px; }
  body > footer > div:nth-child(2) { justify-content: flex-start; }
  .tour-version { margin: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}