:root {
  --color-background: #f7f3ec;
  --color-background-subtle: #efe8de;
  --color-surface: #fcfaf6;
  --color-surface-elevated: #ffffff;
  --color-text-primary: #211f1b;
  --color-text-secondary: #4f4a43;
  --color-text-muted: #6f685f;
  --color-border: #ded5c9;
  --color-border-strong: #b9aa9a;
  --color-accent: #b45132;
  --color-accent-hover: #963f27;
  --color-accent-soft: #f3e2da;
  --color-success: #3f6b4a;
  --color-warning: #8a5a1f;
  --color-danger: #9c3f36;
  --color-info: #365f82;
  --color-code-background: #27231f;
  --color-code-text: #f4eee5;
  --color-selection: #e8c7b7;
  --color-focus: #1b5e8a;
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, SimSun, serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --page: min(1200px, calc(100vw - 48px));
  --read: 720px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 28px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--color-selection); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 4px; }
img { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }

.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; padding: 12px 16px; background: var(--color-surface-elevated); border: 1px solid var(--color-border-strong); }
.skip-link:focus { top: 16px; }
.shell { width: var(--page); margin-inline: auto; }
.site-header { position: relative; z-index: 20; border-bottom: 1px solid var(--color-border); }
.nav-row { min-height: 80px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-family: var(--font-display); font-size: 21px; font-weight: 600; }
.brand-mark-shell { width: 34px; height: 34px; flex: 0 0 34px; display: grid; place-items: center; padding: 0; overflow: visible; border: 0; border-radius: 0; background: transparent; }
.brand-mark { display: block; width: 100%; height: 100%; object-fit: contain; }
.brand-label { display: inline-flex; align-items: baseline; gap: 10px; }
.brand small { color: var(--color-text-muted); font: 12px/1 var(--font-mono); letter-spacing: .08em; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a { min-height: 44px; display: inline-flex; align-items: center; padding: 0 12px; color: var(--color-text-secondary); text-decoration: none; font-size: 14px; letter-spacing: .02em; border-radius: var(--radius-md); }
.nav-links a:hover, .nav-links a[aria-current="page"] { background: var(--color-background-subtle); color: var(--color-text-primary); }
.menu-button { display: none; min-width: 44px; min-height: 44px; border: 1px solid var(--color-border-strong); background: transparent; border-radius: var(--radius-md); cursor: pointer; }
.menu-button span { display: block; width: 18px; height: 1px; margin: 5px auto; background: var(--color-text-primary); }

main { min-height: 68vh; }
.hero { padding: clamp(72px, 10vw, 144px) 0 clamp(72px, 9vw, 120px); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(260px, .7fr); gap: clamp(48px, 8vw, 120px); align-items: end; }
.eyebrow { margin: 0 0 20px; color: var(--color-accent); font: 600 12px/1.4 var(--font-body); letter-spacing: .09em; text-transform: uppercase; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; text-wrap: balance; }
h1 { max-width: 12ch; margin: 0; font-size: clamp(42px, 6vw, 64px); line-height: 1.12; letter-spacing: -.025em; }
h2 { margin: 0; font-size: clamp(30px, 4vw, 44px); line-height: 1.2; letter-spacing: -.018em; }
h3 { margin: 0; font-size: clamp(21px, 2.2vw, 28px); line-height: 1.3; letter-spacing: -.01em; }
.lead { max-width: 38em; margin: 28px 0 0; color: var(--color-text-secondary); font-size: clamp(18px, 2vw, 21px); line-height: 1.75; }
.hero-note { border-top: 1px solid var(--color-border-strong); padding-top: 20px; color: var(--color-text-secondary); }
.hero-note strong { display: block; margin-bottom: 8px; color: var(--color-text-primary); font-family: var(--font-display); font-size: 20px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 20px; border: 1px solid var(--color-border-strong); border-radius: var(--radius-md); background: transparent; color: var(--color-text-primary); text-decoration: none; cursor: pointer; transition: transform .18s ease, background-color .18s ease; }
.button:hover { background: var(--color-surface); transform: translateY(-1px); }
.button-primary { border-color: var(--color-accent); background: var(--color-accent); color: var(--color-surface-elevated); }
.button-primary:hover { background: var(--color-accent-hover); }
.text-link { display: inline-flex; min-height: 44px; align-items: center; font-weight: 600; text-decoration: underline; }

.section { padding: clamp(72px, 9vw, 120px) 0; border-top: 1px solid var(--color-border); }
.section-soft { background: var(--color-background-subtle); }
.section-head { display: grid; grid-template-columns: minmax(160px, .45fr) minmax(0, 1fr); gap: 32px; align-items: start; margin-bottom: 48px; }
.section-index { color: var(--color-text-muted); font: 12px/1.5 var(--font-mono); letter-spacing: .08em; }
.section-copy { max-width: 50ch; margin: 16px 0 0; color: var(--color-text-secondary); }
.nowrap { white-space: nowrap; }
.evidence-line { position: relative; }
.evidence-line::before { content: ""; position: absolute; left: 0; top: 8px; bottom: 8px; width: 1px; background: var(--color-border-strong); }

.status-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--color-border-strong); }
.status-column { padding: 28px 28px 28px 24px; border-right: 1px solid var(--color-border); }
.status-column:last-child { border-right: 0; }
.status-column h3 { margin-bottom: 18px; font-family: var(--font-body); font-size: 15px; letter-spacing: .02em; }
.status-column ul { margin: 0; padding-left: 18px; color: var(--color-text-secondary); }
.status-column li + li { margin-top: 9px; }

.project-feature { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr); gap: 48px; align-items: stretch; }
.media-placeholder { min-height: 440px; display: flex; align-items: flex-end; padding: 28px; background: var(--color-code-background); color: var(--color-code-text); border-radius: var(--radius-xl); overflow: hidden; position: relative; }
.media-placeholder::before { content: ""; position: absolute; width: 55%; aspect-ratio: 3/5; right: 10%; top: 12%; border: 1px solid var(--color-border-strong); border-radius: 28px; background: var(--color-text-primary); }
.media-placeholder::after { content: ""; position: absolute; width: 34%; height: 44%; right: 20%; top: 22%; border: 1px solid var(--color-text-muted); border-radius: 12px; }
.media-label { position: relative; z-index: 1; max-width: 24ch; font: 12px/1.6 var(--font-mono); letter-spacing: .04em; }
.real-media { margin: 0; overflow: hidden; border: 1px solid var(--color-border); border-radius: var(--radius-xl); background: var(--color-code-background); }
.real-media img { width: 100%; height: 100%; object-fit: cover; }
.real-media figcaption { padding: 12px 16px; color: var(--color-text-muted); background: var(--color-surface); font-size: 12px; letter-spacing: .01em; }
.featured-screen { min-height: 440px; background: var(--color-surface); }
.phone-strip { min-height: 440px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; align-items: end; padding: 28px 24px 22px; background: var(--color-surface); }
.phone-strip img { display: block; width: 100%; height: auto; min-height: 0; max-height: 500px; object-fit: contain; object-position: center bottom; }
.screenshot-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 32px 0 48px; }
.screen-shot { margin: 0; overflow: hidden; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-code-background); }
.screen-shot img { width: 100%; aspect-ratio: 9 / 16; object-fit: contain; object-position: center; }
.screen-shot figcaption { padding: 12px 14px; color: var(--color-text-muted); background: var(--color-surface); font-size: 12px; }
.workspace-media img { aspect-ratio: 16 / 9; object-fit: cover; }
.architecture-flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 32px 0; }
.architecture-node { position: relative; min-height: 132px; padding: 18px; border: 1px solid var(--color-border-strong); border-radius: var(--radius-md); background: var(--color-surface); }
.architecture-node:not(:last-child)::after { content: ""; position: absolute; top: 50%; right: -13px; width: 13px; border-top: 1px solid var(--color-border-strong); }
.architecture-node strong { display: block; margin-bottom: 8px; font-size: 14px; }
.architecture-node span { color: var(--color-text-secondary); font-size: 13px; }
.proof-list { margin: 32px 0; border-top: 1px solid var(--color-border-strong); }
.proof-item { display: grid; grid-template-columns: 150px 1fr; gap: 24px; padding: 16px 0; border-bottom: 1px solid var(--color-border); }
.proof-item strong { font-size: 13px; }
.proof-item span { color: var(--color-text-secondary); }
.project-copy { padding: 16px 0; }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 24px; color: var(--color-text-muted); font-size: 13px; }
.badge { display: inline-flex; align-items: center; min-height: 28px; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge-mvp { color: var(--color-success); background: var(--color-surface); border: 1px solid var(--color-border); }
.badge-progress { color: var(--color-info); background: var(--color-surface); border: 1px solid var(--color-border); }
.badge-plan { color: var(--color-warning); background: var(--color-surface); border: 1px solid var(--color-border); }
.project-copy p { color: var(--color-text-secondary); }
.project-points { margin: 28px 0; padding: 0; list-style: none; border-top: 1px solid var(--color-border); }
.project-points li { display: grid; grid-template-columns: 92px 1fr; gap: 18px; padding: 14px 0; border-bottom: 1px solid var(--color-border); }
.project-points strong { font-size: 13px; }

.card-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card { min-height: 260px; padding: 28px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); }
.card p { color: var(--color-text-secondary); }
.card-footer { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--color-border); display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.article-list { border-top: 1px solid var(--color-border-strong); }
.article-row { display: grid; grid-template-columns: 160px 1fr auto; gap: 28px; align-items: start; padding: 28px 0; border-bottom: 1px solid var(--color-border); }
.article-row time, .article-meta { color: var(--color-text-muted); font-size: 13px; }
.article-row h3 { font-size: 24px; }
.article-row p { max-width: 54ch; color: var(--color-text-secondary); }
.empty-state { display: grid; grid-template-columns: 160px minmax(0, 1fr) auto; gap: 28px; align-items: center; min-height: 220px; padding: 36px 0; border-top: 1px solid var(--color-border-strong); border-bottom: 1px solid var(--color-border); }
.empty-state-large { min-height: 360px; }
.empty-state-index { color: var(--color-text-muted); font: 12px/1.5 var(--font-mono); letter-spacing: .08em; }
.empty-state p { max-width: 54ch; margin: 10px 0 0; color: var(--color-text-secondary); }
.topic-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.topic-list span { padding: 7px 10px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); color: var(--color-text-muted); font-size: 12px; }

.page-hero { padding: 80px 0 64px; }
.page-hero h1 { max-width: 16ch; }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; color: var(--color-text-muted); font-size: 13px; }
.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 36px; }
.filter-button { min-height: 44px; padding: 0 14px; border: 1px solid var(--color-border); border-radius: var(--radius-md); color: var(--color-text-secondary); background: transparent; cursor: pointer; }
.filter-button[aria-pressed="true"] { border-color: var(--color-text-primary); color: var(--color-text-primary); background: var(--color-surface); }
[hidden] { display: none !important; }

.detail-hero { padding: 72px 0 56px; }
.detail-hero-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr); gap: 56px; align-items: end; }
.detail-meta { margin: 0; border-top: 1px solid var(--color-border-strong); }
.detail-meta div { display: grid; grid-template-columns: 92px 1fr; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--color-border); }
.detail-meta dt { color: var(--color-text-muted); font-size: 13px; }
.detail-meta dd { margin: 0; }
.case-layout { display: grid; grid-template-columns: 240px minmax(0, 720px); gap: clamp(48px, 8vw, 120px); align-items: start; }
.case-aside { position: sticky; top: 24px; }
.case-aside a { display: block; padding: 7px 0; color: var(--color-text-muted); font-size: 13px; text-decoration: none; }
.case-aside a:hover { color: var(--color-text-primary); }
.prose { max-width: var(--read); font-size: 17px; line-height: 1.82; }
.prose h2 { margin: 72px 0 22px; font-size: 32px; }
.prose h3 { margin: 44px 0 16px; font-size: 23px; }
.prose p { margin: 0 0 1.05em; }
.prose ul, .prose ol { padding-left: 24px; }
.prose li + li { margin-top: 8px; }
.prose blockquote { margin: 32px 0; padding: 8px 0 8px 24px; border-left: 2px solid var(--color-accent); color: var(--color-text-secondary); font-family: var(--font-display); font-size: 22px; }
.callout { margin: 32px 0; padding: 20px 22px; border: 1px solid var(--color-border-strong); border-radius: var(--radius-md); background: var(--color-surface); }
.code-block { overflow-x: auto; padding: 22px; border-radius: var(--radius-md); background: var(--color-code-background); color: var(--color-code-text); font: 14px/1.7 var(--font-mono); }
.evidence-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 32px 0; }
.evidence-item { min-height: 170px; display: flex; align-items: flex-end; padding: 18px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-background-subtle); color: var(--color-text-muted); font-size: 13px; }

.resume-grid { display: grid; grid-template-columns: 260px 1fr; gap: 72px; }
.resume-aside { border-top: 1px solid var(--color-border-strong); padding-top: 20px; }
.resume-section { padding: 0 0 44px; margin-bottom: 44px; border-bottom: 1px solid var(--color-border); }
.resume-item { display: grid; grid-template-columns: 150px 1fr; gap: 24px; padding: 18px 0; }
.resume-item time { color: var(--color-text-muted); font-size: 13px; }

.contact-panel { display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: center; padding: clamp(32px, 5vw, 56px); border: 1px solid var(--color-border-strong); border-radius: var(--radius-lg); background: var(--color-surface); }
.contact-panel p { max-width: 54ch; color: var(--color-text-secondary); }
.contact-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.contact-option { min-height: 180px; display: grid; grid-template-columns: 48px 1fr; gap: 18px; padding: 28px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); text-decoration: none; transition: transform .18s ease, border-color .18s ease; }
.contact-option:hover { transform: translateY(-2px); border-color: var(--color-border-strong); }
.contact-option > span { color: var(--color-accent); font: 12px/1.5 var(--font-mono); letter-spacing: .08em; }
.contact-option p { margin: 10px 0 0; color: var(--color-text-secondary); }
.social-qr-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.social-qr-button { min-height: 132px; display: flex; flex-direction: column; justify-content: space-between; gap: 18px; padding: 24px; color: var(--color-text-primary); text-align: left; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); cursor: pointer; transition: transform .18s ease, border-color .18s ease, background-color .18s ease; }
.social-qr-button:hover { transform: translateY(-2px); border-color: var(--color-border-strong); background: var(--color-surface-elevated); }
.social-qr-button strong { font-family: var(--font-display); font-size: 22px; font-weight: 600; letter-spacing: -.01em; }
.social-qr-button span { color: var(--color-text-muted); font-size: 13px; letter-spacing: .01em; }
.qr-dialog { width: fit-content; max-width: calc(100vw - 24px); max-height: calc(100vh - 24px); padding: 0; color: var(--color-text-primary); border: 1px solid var(--color-border-strong); border-radius: var(--radius-lg); background: var(--color-surface); box-shadow: 0 24px 80px color-mix(in srgb, var(--color-text-primary) 22%, transparent); overflow: hidden; }
.qr-dialog::backdrop { background: color-mix(in srgb, var(--color-text-primary) 58%, transparent); backdrop-filter: blur(4px); }
.qr-dialog-shell { display: flex; flex-direction: column; max-height: calc(100vh - 24px); }
.qr-dialog-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 32px; padding: 20px 20px 16px; border-bottom: 1px solid var(--color-border); }
.qr-dialog-header h2 { margin: 4px 0 0; font-size: 24px; }
.qr-dialog-label { margin: 0; color: var(--color-text-muted); font: 11px/1.5 var(--font-mono); letter-spacing: .08em; }
.qr-dialog-close { min-width: 52px; min-height: 44px; padding: 8px 12px; color: var(--color-text-secondary); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: transparent; cursor: pointer; }
.qr-dialog-figure { min-height: 0; margin: 0; overflow: auto; background: var(--color-surface-elevated); }
.qr-dialog-image { display: block; width: auto; height: auto; margin: 0 auto; object-fit: contain; }
.qr-dialog-figure figcaption { max-width: 68ch; padding: 12px 20px; color: var(--color-text-muted); background: var(--color-surface); font-size: 13px; }
.qr-dialog-actions { display: flex; justify-content: flex-end; gap: 10px; padding: 16px 20px 20px; border-top: 1px solid var(--color-border); background: var(--color-surface); }
.metric-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 30px 0; }
.metric-item { min-height: 132px; display: flex; flex-direction: column; justify-content: flex-end; padding: 20px; border: 1px solid var(--color-border-strong); border-radius: var(--radius-md); background: var(--color-surface); }
.metric-item strong { font-family: var(--font-display); font-size: 24px; letter-spacing: -.01em; }
.metric-item span { margin-top: 8px; color: var(--color-text-muted); font-size: 13px; }
.site-footer { padding: 48px 0; border-top: 1px solid var(--color-border); color: var(--color-text-muted); font-size: 13px; }
.footer-row { display: flex; justify-content: space-between; gap: 24px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a { color: var(--color-text-secondary); }

/* Homepage scroll reveal: layout-neutral, one-shot, and background-independent. */
.reveal-ready [data-reveal] {
  --reveal-x: 0px;
  --reveal-y: 10px;
  --reveal-delay: 0ms;
  opacity: .68;
  transform: translate3d(var(--reveal-x), var(--reveal-y), 0);
  transition: opacity 260ms cubic-bezier(.2, 0, 0, 1), transform 260ms cubic-bezier(.2, 0, 0, 1);
  transition-delay: var(--reveal-delay);
  will-change: opacity, transform;
}
.reveal-ready [data-reveal="left"] { --reveal-x: -12px; --reveal-y: 0px; }
.reveal-ready [data-reveal="right"] { --reveal-x: 12px; --reveal-y: 0px; }
.reveal-ready [data-reveal="fade"] { --reveal-x: 0px; --reveal-y: 0px; }
.reveal-ready [data-reveal].is-revealed {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  will-change: auto;
}

@media (max-width: 900px) {
  :root { --page: min(100% - 32px, 760px); }
  .hero-grid, .project-feature, .detail-hero-grid, .resume-grid, .contact-panel { grid-template-columns: 1fr; }
  .hero-note { max-width: 34em; }
  .status-grid { grid-template-columns: 1fr; }
  .status-column { border-right: 0; border-bottom: 1px solid var(--color-border); }
  .card-list { grid-template-columns: 1fr; }
  .article-row { grid-template-columns: 120px 1fr; }
  .article-row > :last-child { grid-column: 2; }
  .empty-state { grid-template-columns: 120px minmax(0, 1fr); }
  .empty-state > :last-child { grid-column: 2; }
  .case-layout { grid-template-columns: 1fr; }
  .case-aside { position: static; display: flex; gap: 8px 20px; overflow-x: auto; border-bottom: 1px solid var(--color-border); padding-bottom: 12px; }
  .case-aside a { flex: 0 0 auto; }
  .resume-item { grid-template-columns: 120px 1fr; }
}

@media (max-width: 720px) {
  .nav-row { min-height: 64px; }
  .brand-mark-shell { width: 30px; height: 30px; flex-basis: 30px; padding: 0; }
  .menu-button { display: block; }
  .nav-links { position: absolute; top: 64px; left: 16px; right: 16px; display: none; flex-direction: column; align-items: stretch; padding: 12px; border: 1px solid var(--color-border-strong); border-radius: var(--radius-lg); background: var(--color-surface-elevated); }
  .nav-links[data-open="true"] { display: flex; }
  .nav-links:not([data-menu]) { position: static; display: flex; flex-direction: row; flex-wrap: wrap; padding: 0; border: 0; background: transparent; }
  .nav-links a { justify-content: flex-start; }
  .hero { padding-top: 64px; }
  .section-head { grid-template-columns: 1fr; gap: 12px; }
  .media-placeholder { min-height: 360px; border-radius: var(--radius-lg); }
  .article-row { grid-template-columns: 1fr; gap: 10px; }
  .article-row > :last-child { grid-column: auto; }
  .evidence-strip { grid-template-columns: 1fr; }
  .screenshot-grid { grid-template-columns: 1fr; }
  .contact-options { grid-template-columns: 1fr; }
  .social-qr-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .empty-state { grid-template-columns: 1fr; gap: 16px; }
  .empty-state > :last-child { grid-column: auto; }
  .architecture-flow { grid-template-columns: 1fr 1fr; }
  .architecture-node:nth-child(2)::after { display: none; }
  .resume-item { grid-template-columns: 1fr; gap: 6px; }
  .footer-row { flex-direction: column; }
  .contact-panel { padding: 28px; }
  .reveal-ready [data-reveal] { --reveal-x: 0px; --reveal-y: 8px; }
}

@media (max-width: 520px) {
  .social-qr-grid { grid-template-columns: 1fr; }
  .qr-dialog-header { gap: 16px; padding: 16px; }
  .qr-dialog-actions { padding: 14px 16px 16px; }
  .qr-dialog-actions .button { flex: 1; text-align: center; }
}

@media (max-width: 420px) {
  :root { --page: calc(100% - 24px); }
  h1 { font-size: 40px; }
  .actions { flex-direction: column; }
  .button { width: 100%; }
  .project-points li { grid-template-columns: 1fr; gap: 4px; }
  .architecture-flow { grid-template-columns: 1fr; }
  .architecture-node::after { display: none; }
  .proof-item { grid-template-columns: 1fr; gap: 4px; }
  .metric-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .reveal-ready [data-reveal] { opacity: 1; transform: none; transition: none; }
}

@media print {
  .site-header, .site-footer, .actions, .menu-button { display: none !important; }
  body { background: #ffffff; }
  .section { break-inside: avoid; }
}