:root {
  --bg: oklch(98% 0.002 95);
  --surface: oklch(100% 0 0);
  --ink: oklch(18% 0.01 255);
  --muted: oklch(47% 0.01 255);
  --line: oklch(83% 0.006 255);
  --accent: oklch(47% 0.11 198);
  --accent-soft: oklch(93% 0.025 198);
  --font-display: 'Iowan Old Style', 'Songti SC', 'Noto Serif CJK SC', Georgia, serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --measure: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 16px/1.58 var(--font-body); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
button { font: inherit; }
.ui-icon { width: 15px; height: 15px; flex: 0 0 auto; stroke-width: 1.6; }
.shell { width: min(var(--measure), calc(100% - 48px)); margin: auto; }
.topbar { min-height: 70px; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.wordmark { font: 600 13px/1.2 var(--font-mono); letter-spacing: .08em; text-decoration: none; white-space: nowrap; }
.navset { display: flex; align-items: center; gap: 20px; }
.navset a, .lang { color: var(--muted); font-size: 13px; font-weight: 550; letter-spacing: .02em; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.navset a:hover, .navset a[aria-current='page'] { color: var(--ink); }
.lang { border: 1px solid var(--line); background: transparent; min-height: 36px; padding: 0 10px; cursor: pointer; border-radius: 2px; }
.lang:hover { border-color: var(--ink); }
[data-lang] { display: none; }
body[data-ui-lang='zh'] [data-lang='zh'], body[data-ui-lang='en'] [data-lang='en'] { display: revert; }
.inline { display: none; }
body[data-ui-lang='zh'] .inline[data-lang='zh'], body[data-ui-lang='en'] .inline[data-lang='en'] { display: inline; }
.eyebrow, .meta, .section-index, .label { font: 500 12px/1.4 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; }
.eyebrow { color: var(--accent); margin: 0 0 18px; }
.hero { min-height: min(720px, calc(100svh - 70px)); display: grid; grid-template-columns: 1.6fr .8fr; align-items: start; gap: 40px; padding: clamp(42px, 5vh, 64px) 0 42px; }
.hero h1 { max-width: 10ch; margin: 0; font: 590 clamp(48px, 6.2vw, 86px)/1.02 var(--font-display); letter-spacing: -.025em; text-wrap: balance; }
.hero .role { margin: 28px 0 0; font: 550 20px/1.35 var(--font-body); letter-spacing: .01em; }
.hero .intro { max-width: 48ch; margin: 14px 0 0; color: var(--muted); font-size: 17px; }
.hero-aside { align-self: end; border-top: 2px solid var(--ink); padding-top: 14px; }
.hero-aside p { margin: 8px 0 22px; max-width: 25ch; color: var(--muted); font-size: 14px; }
.action-list { display: flex; flex-wrap: wrap; gap: 12px 18px; font-size: 14px; font-weight: 550; }
.action-list a, .link-row a, .footer a { display: inline-flex; align-items: center; gap: 6px; }
.action-list a:first-child { color: var(--accent); }
.section { padding: 92px 0; border-top: 1px solid var(--line); }
.section-head { display: grid; grid-template-columns: 150px 1fr; gap: 32px; margin-bottom: 36px; }
.section h2, .case-title { margin: 0; font: 590 clamp(30px, 4vw, 48px)/1.08 var(--font-display); letter-spacing: -.02em; text-wrap: balance; }
.section-lead { max-width: 60ch; margin: 14px 0 0; color: var(--muted); }
.project-list { border-top: 1px solid var(--ink); }
.project-row { display: grid; grid-template-columns: 72px 1.15fr .85fr; gap: 24px; align-items: start; padding: 28px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.project-row:hover { background: var(--surface); }
.project-num { font: 500 13px/1.4 var(--font-mono); color: var(--accent); }
.project-row h3 { margin: 0; font: 590 26px/1.12 var(--font-display); letter-spacing: -.01em; }
.project-row p { margin: 10px 0 0; color: var(--muted); max-width: 43ch; }
.evidence { display: flex; flex-wrap: wrap; gap: 7px; justify-content: flex-start; }
.evidence span { border: 1px solid var(--line); padding: 6px 8px; font: 500 11px/1.35 var(--font-mono); letter-spacing: .01em; }
.product-craft { display: grid; grid-template-columns: .8fr 1.2fr; gap: 52px; align-items: start; }
.product-craft h3 { margin: 0; font: 590 34px/1.1 var(--font-display); letter-spacing: -.02em; }
.product-craft p { max-width: 48ch; color: var(--muted); }
.screen-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; align-items: start; }
.screen-strip img { width: 100%; border: 1px solid var(--line); display: block; }
.proof-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; }
.bio { max-width: 58ch; margin: 0; font: 20px/1.55 var(--font-display); }
.facts { border-top: 1px solid var(--ink); }
.fact { display: grid; grid-template-columns: 136px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.fact p { margin: 0; }
.footer { padding: 30px 0 60px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer-flex { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.case-hero { padding: 72px 0 48px; border-bottom: 1px solid var(--line); }
.case-hero-grid { display: grid; grid-template-columns: 150px 1fr 300px; gap: 28px; align-items: end; }
.case-title { font-size: clamp(42px, 5vw, 72px); }
.case-deck { max-width: 56ch; margin: 18px 0 0; color: var(--muted); font: 20px/1.5 var(--font-display); }
.case-status { border-top: 2px solid var(--ink); padding-top: 12px; color: var(--muted); font-size: 13px; }
.case-layout { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 32px; padding: 62px 0; }
.case-nav { position: sticky; top: 24px; align-self: start; display: grid; gap: 10px; font: 500 12px/1.3 var(--font-mono); }
.case-nav a { color: var(--muted); text-decoration: none; }
.case-nav a:hover { color: var(--accent); }
.case-content { min-width: 0; }
.case-block { padding: 0 0 54px; }
.case-block h2 { margin: 0 0 16px; font: 590 31px/1.1 var(--font-display); letter-spacing: -.015em; }
.case-block p { max-width: 65ch; margin: 0 0 14px; }
.case-block ul { max-width: 65ch; padding-left: 20px; margin: 0; }
.case-block li { margin: 8px 0; }
.system-map { border: 1px solid var(--ink); padding: 20px; display: grid; gap: 0; max-width: 760px; background: var(--surface); }
.system-map div { border-bottom: 1px solid var(--line); padding: 14px 0; display: grid; grid-template-columns: 148px 1fr; gap: 16px; }
.system-map div:last-child { border-bottom: 0; }
.system-map b { font: 550 12px/1.4 var(--font-mono); letter-spacing: .05em; }
.matrix { width: 100%; border-collapse: collapse; font-size: 14px; }
.matrix th, .matrix td { border-top: 1px solid var(--line); padding: 12px 10px; text-align: left; vertical-align: top; }
.matrix th { color: var(--muted); font: 500 11px/1.4 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; }
.matrix tr:last-child td { border-bottom: 1px solid var(--line); }
.flag { color: var(--accent); font-weight: 600; }
.media-frame { border: 1px solid var(--line); padding: 10px; background: var(--surface); }
.media-frame img { display: block; max-width: 100%; height: auto; }
.evidence-table { border-top: 2px solid var(--ink); max-width: 780px; }
.evidence-table .row { display: grid; grid-template-columns: 1.4fr .8fr; gap: 20px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.evidence-table .row p { margin: 0; }
.evidence-table .row p:last-child { text-align: right; font: 550 14px/1.5 var(--font-mono); }
.limitations { border: 1px solid var(--line); border-radius: 4px; padding: 20px; background: var(--surface); max-width: 760px; }
.limitations h3 { margin: 0 0 8px; font: 550 12px/1.4 var(--font-mono); letter-spacing: .07em; text-transform: uppercase; }
.limitations p { margin-bottom: 0; color: var(--muted); }
.link-row { display: flex; gap: 14px 24px; flex-wrap: wrap; font-weight: 550; }
.iphone-gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; align-items: start; }
.iphone-gallery figure { margin: 0; }
.iphone-gallery img { display: block; width: 100%; border: 1px solid var(--line); }
.iphone-gallery figcaption { margin-top: 8px; font: 500 11px/1.4 var(--font-mono); letter-spacing: .05em; color: var(--muted); }
.capability-list { list-style: none; padding: 0; max-width: 800px; border-top: 1px solid var(--ink); }
.capability-list li { display: grid; grid-template-columns: 170px 1fr; gap: 22px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.resume-note { color: var(--muted); font-size: 14px; }
.email-toast { position: fixed; left: 50%; bottom: max(20px, env(safe-area-inset-bottom)); z-index: 100; max-width: calc(100% - 32px); padding: 10px 14px; border: 1px solid var(--ink); border-radius: 4px; background: var(--ink); color: var(--bg); opacity: 0; pointer-events: none; transform: translate(-50%, 12px); transition: opacity .18s ease, transform .18s ease; font: 500 12px/1.4 var(--font-mono); text-align: center; }
.email-toast.is-visible { opacity: 1; transform: translate(-50%, 0); }
@media (prefers-reduced-motion: reduce) {
  .email-toast { transition: none; }
}
@media (max-width: 760px) {
  .shell { width: min(100% - 32px, var(--measure)); }
  .topbar { min-height: 62px; }
  .navset { gap: 12px; }
  .navset a:not(:last-of-type) { display: none; }
  .hero { min-height: min(690px, calc(100svh - 62px)); grid-template-columns: 1fr; align-items: start; gap: 34px; padding: 40px 0 30px; }
  .hero h1 { max-width: none; font-size: clamp(42px, 12vw, 58px); overflow-wrap: anywhere; }
  .hero .role { font-size: 18px; margin-top: 22px; }
  .hero .intro { font-size: 16px; }
  .section { padding: 64px 0; }
  .section-head, .case-hero-grid, .case-layout { grid-template-columns: 1fr; gap: 18px; }
  .section-index { margin-bottom: 4px; }
  .project-row { grid-template-columns: 44px 1fr; gap: 10px 12px; padding: 22px 0; }
  .project-row .evidence { grid-column: 2; }
  .project-row h3 { font-size: 23px; }
  .project-craft, .proof-grid { grid-template-columns: 1fr; gap: 28px; }
  .product-craft { grid-template-columns: 1fr; gap: 28px; }
  .screen-strip { gap: 6px; }
  .fact, .capability-list li { grid-template-columns: 1fr; gap: 4px; }
  .case-hero { padding: 48px 0 32px; }
  .case-title { font-size: clamp(38px, 11vw, 54px); overflow-wrap: anywhere; }
  .case-deck { font-size: 18px; }
  .case-layout { padding: 42px 0; }
  .case-nav { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); overflow: visible; padding-bottom: 0; white-space: normal; }
  .case-block { padding-bottom: 42px; }
  .case-block h2 { font-size: 28px; }
  .system-map div, .evidence-table .row { grid-template-columns: 1fr; gap: 6px; }
  .evidence-table .row p:last-child { text-align: left; }
  .matrix { font-size: 12px; display: table; table-layout: fixed; white-space: normal; }
  .matrix th, .matrix td { padding: 10px 6px; white-space: normal; overflow-wrap: anywhere; }
  .iphone-gallery { grid-template-columns: repeat(2, 1fr); gap: 12px; }
}