:root {
  color-scheme: light;
  --paper: #f7f8f6;
  --moss-surface: #eef1ed;
  --forest-ink: #17201b;
  --olive-muted: #53615a;
  --fern: #176b4d;
  --fern-dark: #12533d;
  --cloud-blue: #235fa4;
  --sprout: #3f8a62;
  --mineral: #b7791f;
  --brick: #b94735;
  --dry-moss-line: #ccd3ce;
  --white-leaf: #fbfcfa;
  --measure: 68ch;
  --page: 78rem;
  --radius: .35rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--forest-ink);
  background: var(--paper);
  font-family: "Instrument Sans", "Avenir Next", "Segoe UI", "Noto Sans TC", "PingFang TC", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}
:lang(zh-Hant) body { font-size: 1.0625rem; line-height: 1.75; }
:is(h1, h2, h3, p, li, dd) { text-wrap: pretty; overflow-wrap: break-word; }
a { color: var(--cloud-blue); text-decoration-thickness: .08em; text-underline-offset: .18em; }
a:hover { color: var(--fern-dark); }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible {
  outline: 3px solid var(--mineral);
  outline-offset: 3px;
}
img, svg { max-width: 100%; height: auto; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; background: var(--cloud-blue); color: var(--white-leaf); padding: .7rem 1rem; font-weight: 800; }
.skip-link:focus { top: 1rem; }

.site-header { border-bottom: 1px solid var(--forest-ink); background: color-mix(in oklch, var(--paper) 95%, transparent); }
.nav-shell { max-width: var(--page); margin: auto; padding: .8rem 1rem; display: flex; flex-wrap: wrap; gap: .65rem 1rem; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: .55rem; color: var(--forest-ink); text-decoration: none; font-weight: 850; letter-spacing: -.02em; }
.brand-mark { width: 1.05rem; aspect-ratio: 1; background: var(--fern); border: 1px solid var(--forest-ink); transform: rotate(45deg); }
.nav-links { order: 3; width: 100%; display: flex; gap: 1rem; align-items: center; overflow-x: auto; padding-block: .25rem; font-size: .78rem; font-weight: 700; scrollbar-width: thin; }
.nav-links a { min-height: 2.75rem; display: inline-flex; align-items: center; white-space: nowrap; }
.nav-links a { color: var(--forest-ink); text-decoration: none; }
.nav-links a[aria-current="page"] { border-bottom: 2px solid var(--cloud-blue); }
.language-link { white-space: nowrap; border: 1px solid var(--forest-ink); padding: .4rem .65rem; text-decoration: none; color: var(--forest-ink); font-size: .78rem; font-weight: 800; min-height: 2.75rem; display: inline-flex; align-items: center; }

main { min-height: 65vh; }
.shell { max-width: var(--page); margin-inline: auto; padding-inline: clamp(1rem, 3vw, 2rem); }
.hero { min-height: min(44rem, calc(100vh - 4.5rem)); display: grid; align-items: stretch; border-bottom: 1px solid var(--forest-ink); }
.hero-grid { display: grid; }
.hero-copy { padding-block: clamp(4rem, 11vw, 8.5rem); }
.kicker { margin: 0 0 1.2rem; font-size: .72rem; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; color: var(--fern-dark); }
h1, .display { font-family: "Newsreader", "Iowan Old Style", "Noto Serif TC", "Songti TC", serif; font-weight: 650; letter-spacing: -.045em; line-height: .98; }
h1 { max-width: 16ch; margin: 0; font-size: clamp(3rem, 9vw, 7.6rem); }
:lang(zh-Hant) h1 { max-width: 12ch; line-height: 1.08; letter-spacing: -.035em; font-size: clamp(2.7rem, 8vw, 6.7rem); }
.hero-title-line { display: block; }
:lang(zh-Hant) .hero-title-line { white-space: nowrap; }
.hero-lede { max-width: 43rem; margin: 1.8rem 0 0; font-size: clamp(1.15rem, 2.4vw, 1.65rem); line-height: 1.45; color: var(--olive-muted); }
.actions { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 2rem; }
.button { min-height: 3rem; display: inline-flex; align-items: center; justify-content: center; padding: .65rem 1rem; border: 1px solid var(--forest-ink); color: var(--forest-ink); text-decoration: none; font-weight: 800; }
.button.primary { background: var(--fern); color: var(--white-leaf); }
.button:hover { background: var(--forest-ink); color: var(--paper); }
.hero-system { background: var(--moss-surface); border-top: 1px solid var(--forest-ink); padding: 2rem 1rem; display: grid; align-content: center; }
.system-flow { margin: 0; padding: 0; list-style: none; counter-reset: path; }
.system-flow li { counter-increment: path; display: grid; grid-template-columns: 2.2rem 1fr auto; gap: .75rem; align-items: center; border-top: 1px solid var(--forest-ink); padding: 1rem 0; font-weight: 800; }
.system-flow li::before { content: "0" counter(path); font-size: .72rem; color: var(--olive-muted); }
.system-flow li::after { content: "↓"; color: var(--fern); }
.system-flow li:last-child::after { content: "✓"; background: var(--sprout); color: var(--white-leaf); width: 1.8rem; height: 1.8rem; display: grid; place-items: center; border: 1px solid var(--forest-ink); border-radius: 50%; }

.section { padding-block: clamp(4rem, 9vw, 7rem); border-bottom: 1px solid var(--dry-moss-line); }
.section-head { display: grid; gap: 1rem; margin-bottom: clamp(2rem, 5vw, 4rem); }
.section h2, .page-title { margin: 0; font-family: "Newsreader", "Iowan Old Style", "Noto Serif TC", serif; font-size: clamp(2.2rem, 5.2vw, 4.8rem); line-height: 1.04; letter-spacing: -.035em; max-width: 18ch; }
.title-line { display: block; }
:lang(zh-Hant) .title-line { white-space: nowrap; }
.section-intro { max-width: 48rem; margin: 0; color: var(--olive-muted); font-size: clamp(1.05rem, 2vw, 1.3rem); }
.trust-path { display: grid; border-top: 1px solid var(--forest-ink); }
.path-step { display: grid; grid-template-columns: 3.1rem 1fr; gap: .9rem; padding: 1.25rem 0; border-bottom: 1px solid var(--forest-ink); }
.path-step b { color: var(--fern); font-variant-numeric: tabular-nums; }
.path-step h3 { margin: 0; font-size: 1.05rem; }
.path-step p { grid-column: 2; margin: -.45rem 0 0; color: var(--olive-muted); font-size: .92rem; }

.service-index { border-top: 1px solid var(--forest-ink); }
.service-row { display: grid; gap: .65rem; padding: 1.15rem 0; border-bottom: 1px solid var(--dry-moss-line); text-decoration: none; color: var(--forest-ink); }
.service-row:hover { background: var(--moss-surface); color: var(--forest-ink); }
.service-name { font-family: "Newsreader", "Iowan Old Style", "Noto Serif TC", serif; font-size: 1.4rem; font-weight: 700; }
.service-purpose { color: var(--olive-muted); font-size: .92rem; }
.service-meta { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; }
.tag { border: 1px solid var(--dry-moss-line); padding: .16rem .4rem; }
.tag.grade-a { background: color-mix(in oklch, var(--sprout) 22%, var(--paper)); border-color: var(--sprout); }
.tag.grade-c, .tag.grade-d { background: color-mix(in oklch, var(--mineral) 25%, var(--paper)); border-color: var(--mineral); }

.trust-grid, .concept-grid, .content-grid { display: grid; gap: 1px; background: var(--forest-ink); border: 1px solid var(--forest-ink); }
.trust-panel, .concept-item, .content-block { padding: clamp(1.25rem, 3vw, 2rem); background: var(--white-leaf); }
.trust-panel h3, .content-block h2 { margin: 0 0 .7rem; font-size: 1.12rem; }
.trust-panel p, .content-block p { margin: 0; color: var(--olive-muted); }
.concept-item { color: var(--forest-ink); text-decoration: none; min-height: 12rem; display: flex; flex-direction: column; justify-content: space-between; }
.concept-item:hover { background: var(--moss-surface); color: var(--forest-ink); }
.concept-item small { color: var(--fern-dark); font-weight: 850; letter-spacing: .1em; }
.concept-item h2 { margin: 2rem 0 .7rem; font-family: "Newsreader", "Iowan Old Style", "Noto Serif TC", serif; font-size: 1.7rem; line-height: 1.1; }
.concept-item p { margin: 0; color: var(--olive-muted); font-size: .9rem; }

.page-hero { padding-block: clamp(4rem, 10vw, 8rem); border-bottom: 1px solid var(--forest-ink); }
.page-hero .page-title { max-width: 20ch; }
.page-lede { max-width: var(--measure); color: var(--olive-muted); font-size: clamp(1.1rem, 2.3vw, 1.45rem); margin: 1.4rem 0 0; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 2rem; }
.article-index { font-size: .78rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.article-index .tag { display: block; width: max-content; max-width: 100%; margin-bottom: .35rem; }
.prose { width: 100%; min-width: 0; max-width: var(--measure); }
.prose h2 { margin: 3rem 0 .6rem; font-family: "Newsreader", "Iowan Old Style", "Noto Serif TC", serif; font-size: clamp(1.7rem, 3vw, 2.4rem); }
.prose p { margin: 0; color: var(--olive-muted); }
.facts { border-top: 1px solid var(--forest-ink); margin: 1.5rem 0; }
.fact { display: grid; grid-template-columns: 8rem minmax(0, 1fr); gap: 1rem; border-bottom: 1px solid var(--dry-moss-line); padding: .8rem 0; }
.fact dt { font-weight: 800; }
.fact dd { min-width: 0; margin: 0; color: var(--olive-muted); overflow-wrap: anywhere; }
.evidence-strip { margin-block: 1.5rem; border: 1px solid var(--forest-ink); background: var(--moss-surface); }
.evidence-status { display: flex; flex-wrap: wrap; gap: 0; border-bottom: 1px solid var(--forest-ink); }
.evidence-status span { padding: .5rem .7rem; border-right: 1px solid var(--forest-ink); font-size: .7rem; font-weight: 900; letter-spacing: .05em; }
.evidence-status .pass { background: color-mix(in oklch, var(--sprout) 22%, var(--paper)); }
.evidence-meta { padding: .7rem; font-size: .78rem; font-variant-numeric: tabular-nums; }
.architecture { border: 1px solid var(--dry-moss-line); background: var(--white-leaf); padding: 1rem; margin: 1.5rem 0; }
.service-screenshot { margin: 1.5rem 0; border: 1px solid var(--forest-ink); background: var(--white-leaf); }
.service-screenshot img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top; }
.service-screenshot figcaption { padding: .65rem .8rem; color: var(--olive-muted); font-size: .78rem; border-top: 1px solid var(--dry-moss-line); }
.evidence-index { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1rem; }
.evidence-item { display: grid; border: 1px solid var(--dry-moss-line); background: var(--white-leaf); }
.evidence-item > img, .evidence-no-image { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top; border-bottom: 1px solid var(--dry-moss-line); }
.evidence-no-image { display: grid; place-items: center; background: var(--moss-surface); color: var(--olive-muted); font-size: .72rem; font-weight: 850; letter-spacing: .1em; }
.evidence-item-copy { padding: 1rem; }
.evidence-item-copy .kicker { margin-bottom: .55rem; }
.evidence-item-copy h2 { margin: 0 0 .55rem; font-family: "Newsreader", "Iowan Old Style", "Noto Serif TC", serif; font-size: 1.45rem; }
.evidence-item-copy p { margin: 0; color: var(--olive-muted); }
.evidence-item-copy .evidence-count { margin-top: .75rem; font-size: .75rem; font-weight: 800; }
.agent-install { border: 1px solid var(--fern); background: var(--moss-surface); padding: 1rem; margin: 1.5rem 0; }
.agent-install h2 { margin: 0 0 .45rem; font-size: 1.2rem; }
.command { display: flex; flex-direction: column; gap: .5rem; }
.command code { background: var(--white-leaf); border: 1px solid var(--forest-ink); padding: .7rem; overflow-wrap: anywhere; }
.copy-button { min-height: 2.75rem; border: 1px solid var(--cloud-blue); background: var(--cloud-blue); color: var(--white-leaf); font-weight: 800; cursor: pointer; }
details { border-bottom: 1px solid var(--dry-moss-line); padding: 1rem 0; }
summary { cursor: pointer; font-weight: 800; min-height: 2.75rem; }

.site-footer { padding-block: 2rem; border-top: 1px solid var(--forest-ink); }
.footer-grid { display: grid; gap: 1rem; }
.footer-grid p { margin: 0; color: var(--olive-muted); font-size: .8rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: .8rem; font-size: .8rem; font-weight: 700; }

@media (min-width: 48rem) {
  .nav-shell { flex-wrap: nowrap; gap: 1rem; }
  .nav-links { order: initial; width: auto; overflow: visible; padding-block: 0; font-size: .82rem; }
  .hero-grid { grid-template-columns: minmax(0, 1.7fr) minmax(18rem, .65fr); }
  .hero-system { border-top: 0; border-left: 1px solid var(--forest-ink); padding-inline: 2rem; }
  .section-head { grid-template-columns: minmax(0, 1.4fr) minmax(18rem, .8fr); align-items: end; }
  .trust-path { grid-template-columns: repeat(4, 1fr); }
  .path-step { display: block; padding: 1.4rem; border-right: 1px solid var(--forest-ink); }
  .path-step:last-child { border-right: 0; }
  .path-step p { margin-top: .75rem; }
  .service-row { grid-template-columns: 1fr 2fr 1.25fr; align-items: center; padding-inline: .75rem; }
  .trust-grid { grid-template-columns: repeat(3, 1fr); }
  .concept-grid { grid-template-columns: repeat(2, 1fr); }
  .content-grid { grid-template-columns: repeat(3, 1fr); }
  .article-layout { grid-template-columns: 10rem minmax(0, 1fr); }
  .article-index { position: sticky; top: 1.5rem; align-self: start; }
  .command { flex-direction: row; }
  .command code { flex: 1; }
  .copy-button { padding-inline: 1.2rem; }
  .footer-grid { grid-template-columns: 1fr auto; align-items: end; }
  .evidence-index { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 72rem) {
  .concept-grid { grid-template-columns: repeat(3, 1fr); }
  .evidence-index { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

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

@media (max-width: 30rem) {
  :lang(zh-Hant) h1 { font-size: clamp(2rem, 8.8vw, 2.7rem); }
  :lang(zh-Hant) .title-line, :lang(zh-Hant) .hero-title-line { white-space: nowrap; }
}