/* ArchLink 官网 — product website system */
:root {
  --bg: #f9f9f7;
  --surface: #ffffff;
  --subtle: #f0f0ed;
  --ink: #16181b;
  --ink-2: #32363b;
  --muted: #5d6268;
  --line: rgba(22, 24, 27, .1);
  --line-strong: rgba(22, 24, 27, .18);
  --dark: #23262a;
  --accent: #16181b;
  --accent-soft: #ececE9;
  --clay: #16181b;
  --clay-soft: #e6e6e2;
  --sky-soft: #f0f0ed;
  --radius: 4px;
  --radius-lg: 6px;
  --grid-line: rgba(22, 24, 27, .055);
  --grid-line-strong: rgba(22, 24, 27, .09);
  --shadow: 0 1px 2px rgba(22, 24, 27, .04), 0 8px 24px -12px rgba(22, 24, 27, .12);
  --shadow-lg: 0 40px 80px -40px rgba(22, 24, 27, .35);
  --container: 1200px;
  font-family: 'DM Sans', 'Noto Sans SC', -apple-system, 'PingFang SC', sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; font-size: 16px; line-height: 1.7; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
img { display: block; max-width: 100%; }
h1, h2, h3, p, figure, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
h1, h2, h3 { font-weight: 600; letter-spacing: -.02em; }
[hidden] { display: none !important; }
::selection { background: var(--ink); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.skip-link { position: fixed; z-index: 100; top: 8px; left: 8px; padding: 10px 16px; background: #fff; border-radius: 3px; transform: translateY(-160%); }
.skip-link:focus { transform: none; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 112px 0; }
.section-tight { padding: 72px 0; }
.section-white { background: var(--surface); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 40; background: rgba(249, 249, 247, .82); backdrop-filter: saturate(180%) blur(14px); -webkit-backdrop-filter: saturate(180%) blur(14px); border-bottom: 1px solid transparent; transition: border-color .2s; }
.site-header.is-scrolled { border-bottom-color: var(--line); }
.header-inner { height: 68px; display: flex; align-items: center; gap: 40px; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-size: 21px; font-weight: 700; letter-spacing: -.03em; white-space: nowrap; }
.brand small { font-size: 13px; font-weight: 500; color: var(--muted); letter-spacing: 0; }
.brand-mark { display: flex; align-items: flex-end; gap: 2.5px; height: 18px; transform: skewX(-18deg); }
.brand-mark i { display: block; width: 4px; background: currentColor; border-radius: 1px; }
.brand-mark i:nth-child(1) { height: 9px; }
.brand-mark i:nth-child(2) { height: 18px; }
.brand-mark i:nth-child(3) { height: 13px; }
.desktop-nav { display: flex; gap: 4px; flex: 1; }
.desktop-nav a { white-space: nowrap; padding: 6px 14px; border-radius: 2px; font-size: 15px; color: var(--muted); transition: color .15s, background .15s; }
.desktop-nav a:hover { color: var(--ink); background: rgba(22, 24, 27, .05); }
.desktop-nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line-strong); border-radius: 2px; background: transparent; position: relative; }
.menu-toggle span { position: absolute; left: 13px; width: 16px; height: 1.5px; background: var(--ink); transition: transform .2s; }
.menu-toggle span:first-child { top: 17px; }
.menu-toggle span:last-child { top: 23px; }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3px) rotate(-45deg); }
.mobile-nav { position: fixed; inset: 68px 0 0; height: calc(100vh - 68px); height: calc(100dvh - 68px); background: var(--bg); padding: 16px 24px 32px; display: flex; flex-direction: column; overflow-y: auto; }
.mobile-nav a { padding: 16px 4px; font-size: 20px; font-weight: 500; border-bottom: 1px solid var(--line); }
.mobile-nav a[aria-current="page"] { color: var(--accent); }
.mobile-nav .btn { margin-top: 24px; border-bottom: 0; justify-content: center; font-size: 16px; padding: 14px 20px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 10px 22px; border-radius: 2px; font-size: 15px; font-weight: 600; white-space: nowrap; border: 1px solid transparent; transition: background .15s, border-color .15s, transform .15s, box-shadow .15s; }
.btn-sm { min-height: 38px; padding: 7px 16px; font-size: 14px; }
.btn-lg { min-height: 52px; padding: 14px 28px; font-size: 16px; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--ink-2); transform: translateY(-1px); box-shadow: 0 8px 20px -10px rgba(22, 24, 27, .6); }
.btn-secondary { background: var(--surface); border-color: var(--line-strong); }
.btn-secondary:hover { border-color: var(--ink); }
.btn-ghost { color: var(--ink); }
.btn-ghost:hover { background: rgba(22, 24, 27, .05); }
.btn-light { background: #fff; color: var(--ink); }
.btn-light:hover { background: #ececea; }
.btn-outline-light { border-color: rgba(255, 255, 255, .3); color: #fff; }
.btn-outline-light:hover { border-color: #fff; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-size: 15px; font-weight: 600; color: var(--ink); }
.link-arrow::after { content: '→'; transition: transform .15s; }
.link-arrow:hover::after { transform: translateX(3px); }

/* Typography helpers */
.eyebrow { display: inline-block; font-size: 14px; font-weight: 600; color: var(--accent); margin-bottom: 14px; }
.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2, .split-copy h2, .cta h2 { font-size: clamp(28px, 3.4vw, 42px); line-height: 1.25; }
.section-head p { margin-top: 16px; font-size: 18px; color: var(--muted); }
.section-head-row { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; margin-bottom: 48px; }
.section-head-row .section-head { margin-bottom: 0; }
.note { font-size: 13px; color: var(--muted); }

/* Hero */
.hero { padding: 88px 0 96px; background: radial-gradient(1200px 520px at 50% -10%, #ffffff 0%, rgba(255, 255, 255, 0) 70%), var(--bg); overflow: hidden; }
.hero-inner { text-align: center; max-width: 880px; }
.hero-badge { display: inline-flex; align-items: center; gap: 10px; padding: 5px 14px 5px 5px; border: 1px solid var(--line-strong); border-radius: 2px; background: var(--surface); font-size: 14px; color: var(--ink-2); margin-bottom: 28px; transition: border-color .15s; }
.hero-badge:hover { border-color: var(--ink); }
.hero-badge b { flex: none; white-space: nowrap; padding: 2px 10px; border-radius: 2px; background: var(--ink); color: #fff; font-size: 13px; font-weight: 600; }
.hero h1 { font-size: clamp(40px, 6.4vw, 76px); line-height: 1.12; letter-spacing: -.035em; }
.hero h1 em { font-style: normal; text-decoration: underline; text-decoration-thickness: 3px; text-underline-offset: .14em; }
.hero-lead { max-width: 640px; margin: 24px auto 0; font-size: clamp(17px, 1.6vw, 20px); color: var(--muted); }
.hero .btn-row { justify-content: center; margin-top: 36px; }
.hero-visual { margin-top: 72px; }

/* Product mockup */
.app-frame { border-radius: 6px; background: var(--surface); border: 1px solid var(--line-strong); box-shadow: var(--shadow-lg); overflow: hidden; text-align: left; }
.app-bar { height: 42px; display: flex; align-items: center; gap: 7px; padding: 0 16px; background: var(--subtle); border-bottom: 1px solid var(--line); }
.app-bar i { width: 11px; height: 11px; border-radius: 50%; background: #d9d9d4; }
.app-bar span { margin: 0 auto; padding: 3px 18px; border-radius: 2px; background: var(--surface); font-size: 12px; color: var(--muted); transform: translateX(-20px); }
.app-body { display: grid; grid-template-columns: 210px 1fr; min-height: 470px; }
.app-side { padding: 20px 14px; border-right: 1px solid var(--line); background: #fbfbf9; display: flex; flex-direction: column; gap: 4px; }
.app-side .brand { font-size: 16px; padding: 0 8px 18px; }
.app-side .brand-mark { height: 14px; }
.app-side .brand-mark i { width: 3px; }
.app-nav-item { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 3px; font-size: 14px; color: var(--muted); }
.app-nav-item svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.app-nav-item.is-active { background: var(--ink); color: #fff; }
.app-side-foot { margin-top: auto; padding: 12px 10px 0; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); }
.app-main { padding: 26px 28px; display: flex; flex-direction: column; gap: 18px; min-width: 0; }
.app-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.app-title strong { font-size: 17px; }
.app-title span { font-size: 12px; padding: 3px 10px; border-radius: 2px; background: var(--accent-soft); color: var(--accent); font-weight: 600; white-space: nowrap; }
.app-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.app-step { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 3px; font-size: 13px; color: var(--muted); }
.app-step::before { content: ''; flex: none; width: 16px; height: 16px; border-radius: 50%; border: 1.5px solid var(--line-strong); }
.app-step.is-done { color: var(--ink); }
.app-step.is-done::before { border: 0; background: var(--accent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.2l2.3 2.3 4.7-4.9' fill='none' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 16px no-repeat; }
.app-step.is-active { color: var(--ink); border-color: var(--ink); }
.app-step.is-active::before { border-color: var(--ink); border-top-color: transparent; animation: spin 1.2s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.app-results { display: grid; grid-template-columns: 1.25fr 1fr; gap: 14px; flex: 1; }
.app-card { border: 1px solid var(--line); border-radius: 3px; padding: 16px; display: flex; flex-direction: column; gap: 10px; background: var(--surface); }
.app-card-label { font-size: 12px; color: var(--muted); font-weight: 600; }
.app-map { flex: 1; border-radius: 3px; background: var(--subtle) var(--grid-bg); background-size: 16px 16px; display: grid; place-items: center; padding: 10px; }
.app-map svg { width: 100%; max-height: 220px; }
.app-option { display: flex; align-items: center; gap: 12px; padding: 12px; border-radius: 3px; background: var(--subtle); font-size: 14px; font-weight: 500; }
.app-option b { flex: none; display: grid; place-items: center; width: 28px; height: 28px; border-radius: 3px; background: var(--surface); font-size: 13px; }
.app-option:first-of-type { background: var(--ink); color: #fff; }
.app-option:first-of-type b { background: rgba(255, 255, 255, .14); }
.app-input { display: flex; align-items: center; gap: 12px; padding: 10px 10px 10px 16px; border: 1px solid var(--line-strong); border-radius: 3px; font-size: 14px; color: var(--muted); }
.app-input span { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.app-input i { flex: none; width: 32px; height: 32px; border-radius: 3px; background: var(--ink); display: grid; place-items: center; color: #fff; font-style: normal; font-size: 15px; }
.mock-note { margin-top: 16px; text-align: center; font-size: 13px; color: var(--muted); }

/* Diagram strokes */
.diagram-grid { stroke: rgba(22, 24, 27, .12); stroke-width: 1; }
.diagram-land { fill: rgba(22, 24, 27, .07); stroke: var(--ink); stroke-width: 1.4; }
.diagram-building { fill: var(--ink); fill-opacity: .82; }
.diagram-line { stroke: var(--ink); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.diagram-paper { fill: #fff; stroke: var(--ink); stroke-width: 1.2; }
.diagram-highlight { stroke: var(--ink); stroke-width: 2.4; stroke-linecap: round; }

/* Logo strip */
.trust { padding: 40px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); }
.trust-inner { display: flex; align-items: center; gap: 48px; }
.trust-label { flex: none; font-size: 14px; color: var(--muted); }
.trust-list { flex: 1; display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.trust-list li { display: flex; flex-direction: column; gap: 2px; }
.trust-list strong { font-size: 16px; font-weight: 600; line-height: 1.4; }
.trust-list span { font-size: 13px; color: var(--muted); }

/* Cards */
.card-grid { display: grid; gap: 20px; }
.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card { position: relative; display: flex; flex-direction: column; gap: 12px; padding: 28px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); transition: border-color .2s, box-shadow .2s, transform .2s; }
a.card:hover, .card.is-hoverable:hover { border-color: var(--line-strong); box-shadow: var(--shadow); transform: translateY(-2px); }
.card h3 { font-size: 20px; line-height: 1.4; }
.card p { color: var(--muted); font-size: 15px; }
.card .link-arrow { margin-top: auto; padding-top: 8px; }
.card-tag { align-self: flex-start; padding: 3px 10px; border-radius: 2px; background: var(--subtle); font-size: 12px; font-weight: 600; color: var(--ink-2); }
.icon { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 3px; background: var(--accent-soft); color: var(--accent); margin-bottom: 8px; }
.icon svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.icon.clay { background: var(--clay-soft); color: var(--clay); }
.icon.sky { background: var(--sky-soft); color: var(--ink); }
.icon.ink { background: var(--subtle); color: var(--ink); }
.card-thumb { margin: -28px -28px 8px; aspect-ratio: 16 / 10; border-radius: var(--radius) var(--radius) 0 0; display: grid; place-items: center; padding: 24px; background: var(--accent-soft); border-bottom: 1px solid var(--line); }
.card-thumb svg { width: 100%; max-width: 280px; }
.cols-2 .card-thumb { aspect-ratio: 16 / 7; }
.card-thumb.clay { background: var(--clay-soft); }
.card-thumb.sky { background: var(--sky-soft); }
.card-thumb.ink { background: var(--subtle); }
.check-list { display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 28px; color: var(--ink-2); }
.check-list li::before { content: ''; position: absolute; left: 0; top: 5px; width: 18px; height: 18px; border-radius: 50%; background: var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5.5 9.2l2.3 2.3 4.7-4.9' fill='none' stroke='%2316181b' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 18px no-repeat; }
.pill-list { display: flex; flex-wrap: wrap; gap: 8px; }
.pill-list li { padding: 4px 12px; border-radius: 2px; background: var(--subtle); font-size: 13px; color: var(--ink-2); }

/* Split feature */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; }
.split.reverse > :first-child { order: 2; }
.split-copy > p { margin-top: 18px; font-size: 17px; color: var(--muted); }
.split-copy .check-list { margin-top: 28px; }
.split-copy .btn-row { margin-top: 36px; }
.panel { border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); padding: 32px; box-shadow: var(--shadow); }
.steps { display: grid; gap: 0; }
.steps li { position: relative; display: grid; grid-template-columns: 40px 1fr; gap: 16px; padding-bottom: 28px; }
.steps li:last-child { padding-bottom: 0; }
.steps li::before { content: ''; position: absolute; left: 19px; top: 40px; bottom: 4px; width: 1px; background: var(--line-strong); }
.steps li:last-child::before { display: none; }
.steps b { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--surface); border: 1px solid var(--ink); font-size: 14px; }
.steps li:last-child b { background: var(--ink); color: #fff; }
.steps strong { display: block; font-size: 17px; line-height: 40px; }
.steps p { color: var(--muted); font-size: 14px; margin-top: -4px; }
.media { position: relative; border-radius: var(--radius-lg); overflow: hidden; background: var(--subtle); }
.media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3.4; }
.media figcaption { position: absolute; left: 16px; bottom: 16px; padding: 4px 12px; border-radius: 2px; background: rgba(255, 255, 255, .9); font-size: 12px; color: var(--muted); }

/* Stats / dark */
.dark { background: var(--dark); color: #f2f2f0; }
.dark .eyebrow { color: rgba(242, 242, 240, .6); }
.dark .section-head p, .dark .card p { color: rgba(242, 242, 240, .66); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid rgba(255, 255, 255, .12); }
.stat { padding: 32px 24px 0 0; }
.stat + .stat { padding-left: 24px; border-left: 1px solid rgba(255, 255, 255, .12); }
.stat strong { display: block; font-size: clamp(36px, 4.4vw, 56px); font-weight: 600; letter-spacing: -.04em; line-height: 1.1; }
.stat strong small { font-size: .4em; font-weight: 500; margin-left: 4px; letter-spacing: 0; }
.stat span { display: block; margin-top: 10px; font-size: 14px; color: rgba(242, 242, 240, .66); }
.dark .card { background: rgba(255, 255, 255, .04); border-color: rgba(255, 255, 255, .1); }
.dark .card-tag { background: rgba(255, 255, 255, .08); color: #f2f2f0; }
.dark .tech-grid { margin-top: 72px; }

/* Case cards */
.case-card .card-tag { margin-top: 4px; }
.case-card ul { margin-top: 4px; }
.case-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 32px; }
.case-filters button { display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 6px 16px; border-radius: 2px; border: 1px solid var(--line-strong); background: var(--surface); font-size: 14px; font-weight: 500; }
.case-filters button span { font-size: 12px; color: var(--muted); }
.case-filters button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.case-filters button[aria-pressed="true"] span { color: rgba(255, 255, 255, .6); }
.filter-status { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* Page hero (sub pages) */
.page-hero { padding: 80px 0 72px; text-align: center; }
.page-hero .container { max-width: 820px; }
.breadcrumbs { display: flex; justify-content: center; gap: 8px; font-size: 13px; color: var(--muted); margin-bottom: 20px; }
.breadcrumbs a:hover { color: var(--ink); }
.page-hero h1 { font-size: clamp(36px, 5vw, 60px); line-height: 1.15; letter-spacing: -.03em; }
.page-hero p { margin: 20px auto 0; max-width: 620px; font-size: 18px; color: var(--muted); }
.page-hero .btn-row { justify-content: center; margin-top: 32px; }

/* Product accordion */
.module-layout { display: grid; grid-template-columns: 1fr 1.05fr; gap: 64px; align-items: start; }
.module-visual { position: sticky; top: 100px; }
.feature-list { border-top: 1px solid var(--line); }
.feature-item { border-bottom: 1px solid var(--line); }
.feature-trigger { width: 100%; display: flex; align-items: center; gap: 16px; padding: 22px 0; border: 0; background: none; text-align: left; font-size: 20px; font-weight: 600; }
.feature-trigger > span:nth-child(2) { flex: 1; display: flex; align-items: center; gap: 10px; }
.feature-number { font-size: 13px; font-weight: 500; color: var(--muted); width: 24px; }
.feature-sign { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; border: 1px solid var(--line-strong); font-size: 18px; font-weight: 400; transition: background .15s; }
.feature-item.is-open .feature-sign { background: var(--ink); border-color: var(--ink); color: #fff; }
.feature-trigger:hover .feature-sign { border-color: var(--ink); }
.feature-body { overflow: hidden; padding: 0 48px 24px 40px; }
.feature-body p { color: var(--muted); }
.status-label { padding: 1px 8px; border-radius: 2px; border: 1px solid var(--ink); color: var(--ink); font-size: 12px; font-weight: 600; }
.channel-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.channel-grid div { background: var(--surface); padding: 22px 24px; display: flex; flex-direction: column; gap: 4px; }
.channel-grid span { font-size: 13px; color: var(--muted); }
.channel-grid strong, .channel-grid a { font-weight: 600; }
.channel-grid a:hover { color: var(--accent); }
.plan-card.featured { background: var(--ink); color: #fff; border-color: var(--ink); }
.plan-card.featured p { color: rgba(255, 255, 255, .7); }
.plan-card.featured .card-tag { background: rgba(255, 255, 255, .12); color: #fff; }

/* Solutions */
.solution-tabs { display: inline-flex; gap: 4px; padding: 5px; border-radius: 2px; background: #ececE8; margin-bottom: 32px; flex-wrap: wrap; }
.solution-tabs button { min-height: 42px; padding: 8px 22px; border: 0; border-radius: 2px; background: transparent; font-size: 15px; font-weight: 600; color: var(--muted); transition: background .15s, color .15s; }
.solution-tabs button[aria-selected="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 1px 3px rgba(22, 24, 27, .12); }
.solution-panel { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; padding: 48px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); }
.solution-panel h3 { font-size: clamp(26px, 3vw, 36px); line-height: 1.3; }
.solution-panel-copy p { color: var(--muted); font-size: 16px; margin-bottom: 24px; }
.audience-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 20px; }

/* About */
.mission { padding: 96px 0; text-align: center; }
.mission blockquote { margin: 0 auto; max-width: 860px; font-size: clamp(24px, 3vw, 36px); font-weight: 500; line-height: 1.5; letter-spacing: -.01em; }
.team-card { flex-direction: row; align-items: flex-start; gap: 18px; }
.avatar { flex: none; display: grid; place-items: center; width: 52px; height: 52px; border-radius: 50%; background: var(--surface); border: 1px solid var(--ink); color: var(--ink); font-size: 20px; font-weight: 600; }


.team-card h3 { font-size: 18px; }
.team-card .role { font-size: 13px; color: var(--muted); font-weight: 600; margin-top: 2px; }
.team-card p { margin-top: 8px; font-size: 14px; }
.timeline { position: relative; max-width: 820px; }
.timeline li { position: relative; display: grid; grid-template-columns: 120px 1fr; gap: 32px; padding: 0 0 36px 0; }
.timeline li::before { content: ''; position: absolute; left: 136px; top: 8px; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--bg), 0 0 0 5px var(--ink); }
.timeline li::after { content: ''; position: absolute; left: 140px; top: 24px; bottom: 0; width: 1px; background: var(--line-strong); }
.timeline li:last-child::after { display: none; }
.timeline time { font-weight: 600; font-variant-numeric: tabular-nums; }
.timeline p { padding-left: 24px; color: var(--ink-2); }
.content-source { display: block; margin-top: 4px; font-size: 13px; color: var(--muted); }
.award-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.award-list li { display: flex; gap: 14px; padding: 22px 24px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); font-weight: 500; }
.award-list li::before { content: ''; flex: none; width: 8px; height: 8px; margin-top: 10px; border-radius: 0; background: var(--ink); }
.award-list small { display: block; margin-top: 4px; font-size: 13px; font-weight: 400; color: var(--muted); }

/* Contact */
.contact-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 32px; align-items: start; }
.contact-info { display: grid; gap: 16px; }
.contact-info .card { padding: 24px; gap: 4px; }
.contact-info .card span { font-size: 13px; color: var(--muted); }
.contact-info .card a, .contact-info .card strong { font-size: 18px; font-weight: 600; }
.contact-info .card a:hover { color: var(--accent); }
.contact-form { padding: 40px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); display: grid; gap: 20px; }
.contact-form h2 { font-size: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form label { display: grid; gap: 8px; font-size: 14px; font-weight: 600; }
.contact-form label i { font-style: normal; color: var(--muted); }
.contact-form input, .contact-form select, .contact-form textarea { width: 100%; min-height: 46px; padding: 10px 14px; border: 1px solid var(--line-strong); border-radius: 3px; background: var(--bg); font-size: 15px; font-weight: 400; transition: border-color .15s, background .15s, box-shadow .15s; }
.contact-form textarea { resize: vertical; min-height: 110px; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: none; border-color: var(--ink); background: #fff; box-shadow: 0 0 0 3px rgba(22, 24, 27, .08); }
.form-bottom { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; padding-top: 4px; }
.form-bottom p { font-size: 13px; color: var(--muted); }
.form-bottom button { border: 0; }
.form-status { font-size: 14px; color: var(--accent); }
.form-status:empty { display: none; }

/* CTA */
.cta-wrap { padding: 0 0 112px; }
.cta { display: flex; align-items: center; justify-content: space-between; gap: 32px; padding: 64px; border-radius: 6px; background: var(--ink); color: #fff; position: relative; overflow: hidden; }
.cta::after { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px); background-size: 32px 32px; -webkit-mask-image: linear-gradient(90deg, transparent 30%, #000 100%); mask-image: linear-gradient(90deg, transparent 30%, #000 100%); pointer-events: none; }
.cta > * { position: relative; z-index: 1; }
.cta p { margin-top: 12px; color: rgba(255, 255, 255, .66); font-size: 17px; }

/* Footer */
.footer { background: var(--dark); color: rgba(242, 242, 240, .7); font-size: 14px; }
.footer-main { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 48px; padding: 72px 24px 56px; }
.footer .brand { color: #f2f2f0; }
.footer-about p { margin-top: 14px; max-width: 280px; }
.footer h4 { margin: 0 0 16px; font-size: 14px; font-weight: 600; color: #f2f2f0; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 24px; border-top: 1px solid rgba(255, 255, 255, .1); font-size: 13px; }
.footer-bottom-wrap { border-top: 1px solid rgba(255, 255, 255, .1); }
.footer-bottom-wrap .footer-bottom { border: 0; }

/* Responsive */
@media (max-width: 1080px) {
  .cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split, .module-layout { gap: 48px; }
  .app-body { grid-template-columns: 1fr; }
  .app-side { display: none; }
}
@media (max-width: 900px) {
  .section { padding: 80px 0; }
  .cols-3, .audience-strip { grid-template-columns: 1fr; }
  .split, .module-layout, .contact-layout, .solution-panel { grid-template-columns: 1fr; }
  .split.reverse > :first-child { order: 0; }
  .module-visual { position: static; }
  .solution-panel { padding: 32px; gap: 24px; }
  .trust-inner { flex-direction: column; align-items: flex-start; gap: 20px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { padding-left: 0; border-left: 0; }
  .stat { padding-bottom: 32px; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-about { grid-column: 1 / -1; }
  .cta { flex-direction: column; align-items: flex-start; padding: 48px 32px; }
  .section-head-row { flex-direction: column; align-items: flex-start; }
  .channel-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 960px) {
  .desktop-nav, .header-actions .btn { display: none; }
  .header-inner { justify-content: space-between; }
  .menu-toggle { display: block; }
}
@media (max-width: 800px) {
  .hero { padding: 56px 0 72px; }
  .hero-visual { margin-top: 48px; }
  .app-steps { grid-template-columns: repeat(2, 1fr); }
  .app-results { grid-template-columns: 1fr; }
  .app-main { padding: 18px; }
  .hero-badge { font-size: 13px; text-align: left; }
}
@media (max-width: 640px) {
  .cols-2, .cols-4, .award-list, .form-row, .channel-grid { grid-template-columns: 1fr; }
  .trust-list { grid-template-columns: 1fr; gap: 16px; }
  .card { padding: 24px; }
  .card-thumb { margin: -24px -24px 8px; }
  .contact-form { padding: 24px; }
  .contact-form input, .contact-form select, .contact-form textarea { font-size: 16px; }
  .timeline li { grid-template-columns: 1fr; gap: 4px; padding-left: 28px; }
  .timeline li::before { left: 0; }
  .timeline li::after { left: 4px; }
  .timeline p { padding-left: 0; }
  .team-card { flex-direction: column; }
  .btn-row .btn { flex: 1 1 auto; }
  .page-hero { padding: 56px 0 48px; }
  .feature-body { padding: 0 0 20px 40px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* Architectural drawing language: grids, dimension marks, scale bar, north arrow */
:root { --grid-bg: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px); }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; color: var(--ink-2); letter-spacing: .04em; }
.eyebrow::before { content: ''; flex: none; width: 28px; height: 7px; border-left: 1px solid currentColor; border-right: 1px solid currentColor; background: linear-gradient(currentColor, currentColor) center / 100% 1px no-repeat; }
.hero, .page-hero { position: relative; }
.hero::before, .page-hero::before { content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(var(--grid-line-strong) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line-strong) 1px, transparent 1px), var(--grid-bg);
  background-size: 160px 160px, 160px 160px, 32px 32px, 32px 32px; background-position: center top;
  -webkit-mask-image: radial-gradient(ellipse 70% 75% at 50% 30%, #000 25%, transparent 80%); mask-image: radial-gradient(ellipse 70% 75% at 50% 30%, #000 25%, transparent 80%); }
.hero > *, .page-hero > * { position: relative; }
.card-thumb { background-color: #f3f3f0; background-image: var(--grid-bg); background-size: 16px 16px; }
.card-thumb.clay, .card-thumb.sky, .card-thumb.ink { background-color: #f3f3f0; }
.icon, .icon.clay, .icon.sky, .icon.ink { background: transparent; border: 1px solid var(--line-strong); color: var(--ink); border-radius: 3px; }
.check-list li::before { background-color: transparent; border: 1px solid var(--ink); border-radius: 50%; }
.app-step.is-done::before { background-color: var(--ink); }
.app-title span { background: transparent; border: 1px solid var(--ink); color: var(--ink); }
.dark { background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px); background-size: 80px 80px; background-position: center top; }
.plan-card.featured { background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px); background-size: 24px 24px; }
.media { border-radius: 4px; }
.drawing-meta { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-top: 20px; }
.drawing-meta .mock-note { margin: 0; }
.scale-bar { display: inline-flex; flex-direction: column; gap: 4px; font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }
.scale-track { display: flex; width: 160px; height: 6px; border: 1px solid var(--ink); }
.scale-track i { flex: 1; }
.scale-track i:nth-child(odd) { background: var(--ink); }
.scale-labels { display: flex; justify-content: space-between; width: 172px; margin-left: -4px; }
.scale-labels span { width: 12px; text-align: center; }
.scale-labels span:last-child { width: auto; margin-right: -14px; }
.scale-caption { margin-top: 2px; letter-spacing: .06em; }
.north { display: inline-flex; flex-direction: column; align-items: center; gap: 2px; font-size: 11px; font-weight: 600; color: var(--ink); }
.north svg { width: 30px; height: 30px; }
.dark .scale-bar { color: rgba(242,242,240,.6); }
.dark .scale-track { border-color: #f2f2f0; }
.dark .scale-track i:nth-child(odd) { background: #f2f2f0; }
.footer-scale { margin-top: 28px; }
.footer .scale-bar { color: rgba(242,242,240,.5); }
.footer .scale-track { border-color: rgba(242,242,240,.7); }
.footer .scale-track i:nth-child(odd) { background: rgba(242,242,240,.7); }
.section-head-row { position: relative; padding-top: 28px; border-top: 1px solid var(--line-strong); }
.section-head-row::before, .section-head-row::after { content: ''; position: absolute; top: -5px; width: 1px; height: 9px; background: var(--ink); }
.section-head-row::before { left: 0; }
.section-head-row::after { right: 0; }
@media (max-width: 640px) { .drawing-meta { flex-wrap: wrap; justify-content: center; } .drawing-meta .north { display: none; } }
.media img { filter: grayscale(1) contrast(1.05); }