:root {
  --bg: #05080f;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-2: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: #eaf0ff;
  --muted: #97a5c4;
  --brand: #5b8cff;
  --brand-2: #22d3ee;
  --brand-3: #a78bfa;
  --radius: 20px;
  --max: 1160px;
  --shadow: 0 24px 60px rgba(3, 8, 22, 0.55);
  --font: "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 620px at 10% -10%, rgba(91, 140, 255, 0.24), transparent 62%),
    radial-gradient(760px 560px at 94% 2%, rgba(167, 139, 250, 0.18), transparent 60%),
    radial-gradient(900px 700px at 62% 104%, rgba(34, 211, 238, 0.1), transparent 62%),
    linear-gradient(180deg, #05080f 0%, #070c18 48%, #05080f 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    radial-gradient(1px 1px at 24px 36px, rgba(255, 255, 255, 0.55), transparent 60%),
    radial-gradient(1px 1px at 148px 92px, rgba(255, 255, 255, 0.35), transparent 60%),
    radial-gradient(1.4px 1.4px at 262px 168px, rgba(160, 200, 255, 0.5), transparent 60%),
    radial-gradient(1px 1px at 336px 58px, rgba(255, 255, 255, 0.3), transparent 60%),
    radial-gradient(1px 1px at 78px 218px, rgba(190, 210, 255, 0.4), transparent 60%);
  background-size: 420px 320px;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { color: #fff; }
h1, h2, h3, h4 { line-height: 1.3; margin: 0 0 14px; font-weight: 700; letter-spacing: -0.01em; }
p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 1.2em; }
li { margin-bottom: 8px; }
::selection { background: rgba(91, 140, 255, 0.35); color: #fff; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* 顶部导航 */
.site-header {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
}
.site-header.is-scrolled {
  background: rgba(6, 10, 20, 0.82);
  border-bottom-color: var(--line);
  backdrop-filter: blur(14px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: 0.02em; }
.brand svg { width: 30px; height: 30px; flex: none; }
.brand span small { display: block; font-size: 11px; font-weight: 400; color: var(--muted); letter-spacing: 0.16em; line-height: 1; margin-top: 2px; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  position: relative; padding: 8px 14px; border-radius: 10px;
  font-size: 15px; color: var(--muted); transition: color 0.2s ease, background 0.2s ease;
}
.nav a:hover { color: var(--text); background: rgba(255, 255, 255, 0.05); }
.nav a[aria-current="page"] { color: var(--text); }
.nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px; height: 2px;
  border-radius: 2px; background: linear-gradient(90deg, var(--brand), var(--brand-2));
}
.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none; width: 42px; height: 42px; border-radius: 12px; border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04); color: var(--text); cursor: pointer; padding: 0;
}
.nav-toggle span { display: block; width: 18px; height: 2px; background: currentColor; margin: 4px auto; border-radius: 2px; transition: 0.25s ease; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 26px; border-radius: 999px;
  font-size: 15px; font-weight: 600; border: 1px solid transparent;
  cursor: pointer; transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); color: #fff; }
.btn-primary {
  background: linear-gradient(120deg, #5b8cff, #7b6bff 55%, #22d3ee 130%);
  box-shadow: 0 12px 30px rgba(91, 140, 255, 0.32);
  color: #fff;
}
.btn-primary:hover { box-shadow: 0 16px 38px rgba(91, 140, 255, 0.45); }
.btn-ghost { border-color: var(--line-strong); background: rgba(255, 255, 255, 0.04); color: var(--text); }
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.34); background: rgba(255, 255, 255, 0.08); }
.btn-sm { min-height: 40px; padding: 0 18px; font-size: 14px; }
.btn svg { width: 18px; height: 18px; }

/* 首屏 */
.hero { position: relative; padding: 78px 0 64px; }
.hero-grid { display: grid; grid-template-columns: 1.02fr 0.98fr; gap: 56px; align-items: center; }
.hero-grid > *, .split > *, .download-card > *, .grid-3 > *, .grid-2 > *, .scene-grid > *, .steps > *, .footer-grid > * { min-width: 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
  border: 1px solid rgba(91, 140, 255, 0.35); background: rgba(91, 140, 255, 0.1);
  font-size: 13px; color: #b9cdff; letter-spacing: 0.04em;
}
.eyebrow i { width: 6px; height: 6px; border-radius: 50%; background: var(--brand-2); box-shadow: 0 0 12px var(--brand-2); }
.hero h1 { font-size: clamp(34px, 4.4vw, 58px); margin-bottom: 20px; letter-spacing: -0.02em; }
.hero h1 .grad {
  background: linear-gradient(100deg, #8fb2ff 0%, #c4b5fd 45%, #67e8f9 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { font-size: 17px; color: #b4c0db; max-width: 560px; margin-bottom: 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 22px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 13.5px; color: var(--muted); }
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero-meta svg { width: 15px; height: 15px; color: var(--brand-2); }

/* 浏览器窗口示意 */
.mockup {
  position: relative; border-radius: 22px; overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, rgba(20, 28, 48, 0.96), rgba(9, 13, 24, 0.98));
  box-shadow: var(--shadow), 0 0 0 1px rgba(91, 140, 255, 0.08) inset;
  transform: perspective(1400px) rotateY(-6deg) rotateX(2deg);
  transition: transform 0.5s ease;
}
.mockup:hover { transform: perspective(1400px) rotateY(-2deg) rotateX(0deg); }
.mockup::after {
  content: ""; position: absolute; inset: -40% -10% auto auto; width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(91, 140, 255, 0.3), transparent 65%); pointer-events: none;
}
.mockup-top { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, 0.02); }
.dots { display: flex; gap: 6px; flex: none; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: #39425c; }
.dots i:nth-child(1) { background: #ff6b6b; }
.dots i:nth-child(2) { background: #ffd166; }
.dots i:nth-child(3) { background: #4ade80; }
.mock-tabs { display: flex; align-items: center; gap: 6px; overflow: hidden; font-size: 12px; min-width: 0; }
.mock-tab { padding: 5px 12px; border-radius: 8px 8px 0 0; color: var(--muted); white-space: nowrap; }
.mock-tab.active { background: rgba(255, 255, 255, 0.07); color: var(--text); }
.mock-plus { color: var(--muted); padding: 0 6px; }
.mockup-bar { display: flex; align-items: center; gap: 10px; padding: 10px 14px; }
.mock-url {
  flex: 1; display: flex; align-items: center; gap: 8px; height: 32px; padding: 0 12px;
  border-radius: 999px; background: rgba(255, 255, 255, 0.06); border: 1px solid var(--line);
  font-size: 12px; color: #a9b6d4;
}
.mock-url svg { width: 13px; height: 13px; color: var(--brand-2); flex: none; }
.mockup-body { padding: 22px 22px 26px; }
.mock-hello { text-align: center; margin-bottom: 20px; }
.mock-hello strong { display: block; font-size: 19px; margin-bottom: 4px; }
.mock-hello span { font-size: 12px; color: var(--muted); }
.mock-search {
  height: 42px; margin: 16px auto 24px; max-width: 340px; border-radius: 999px;
  border: 1px solid rgba(91, 140, 255, 0.35); background: rgba(91, 140, 255, 0.09);
  display: flex; align-items: center; padding: 0 16px; gap: 8px; font-size: 12px; color: #90a3c9;
}
.mock-search::before { content: ""; width: 12px; height: 12px; border: 2px solid #7d93bd; border-radius: 50%; }
.tile-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.tile {
  aspect-ratio: 1 / 0.82; border-radius: 14px; border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.035); display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 6px; font-size: 11px; color: #a9b6d4;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.tile:hover { background: rgba(91, 140, 255, 0.12); border-color: rgba(91, 140, 255, 0.4); transform: translateY(-2px); }
.tile b {
  width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center;
  font-size: 12px; font-weight: 700; color: #dbe6ff;
  background: linear-gradient(140deg, rgba(91, 140, 255, 0.45), rgba(34, 211, 238, 0.25));
}
.mockup-glow { position: absolute; left: 6%; top: 12%; width: 88%; height: 76%; z-index: -1; filter: blur(48px); background: radial-gradient(ellipse at 50% 50%, rgba(91, 140, 255, 0.35), transparent 70%); }

/* 数据条 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 56px; }
.stat {
  padding: 18px 20px; border-radius: 16px; border: 1px solid var(--line);
  background: var(--surface); display: flex; flex-direction: column; gap: 2px;
}
.stat b { font-size: 20px; letter-spacing: 0.01em; }
.stat span { font-size: 12.5px; color: var(--muted); }

/* 通用区块 */
.section { padding: 88px 0; }
.section-head { max-width: 700px; margin: 0 auto 46px; text-align: center; }
.kicker {
  display: inline-block; margin-bottom: 12px; font-size: 12.5px; font-weight: 600;
  letter-spacing: 0.18em; text-transform: uppercase; color: #8fb2ff;
}
.section-head h2 { font-size: clamp(26px, 3vw, 38px); margin-bottom: 12px; }
.section-head p { color: var(--muted); font-size: 16px; margin: 0; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }

.card {
  position: relative; padding: 26px 24px; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--surface);
  transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease, box-shadow 0.28s ease;
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity 0.28s ease;
  background: radial-gradient(420px 220px at 20% 0%, rgba(91, 140, 255, 0.18), transparent 65%);
}
.card:hover { transform: translateY(-4px); border-color: rgba(91, 140, 255, 0.4); box-shadow: 0 18px 44px rgba(3, 8, 22, 0.5); }
.card:hover::before { opacity: 1; }
.card > * { position: relative; }
.card-icon {
  width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; margin-bottom: 18px;
  background: linear-gradient(145deg, rgba(91, 140, 255, 0.28), rgba(34, 211, 238, 0.14));
  border: 1px solid rgba(91, 140, 255, 0.3); color: #cfe0ff;
}
.card-icon svg { width: 22px; height: 22px; }
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14.5px; margin: 0; line-height: 1.75; }

/* 图文左右 */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 34px 0; }
.split.reverse .split-copy { order: 2; }
.split-copy h2 { font-size: clamp(24px, 2.6vw, 34px); margin-bottom: 14px; }
.split-copy p { color: var(--muted); }
.checklist { list-style: none; padding: 0; margin: 20px 0 0; }
.checklist li { position: relative; padding-left: 28px; color: #c3cde4; font-size: 15px; margin-bottom: 10px; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 7px; width: 16px; height: 16px; border-radius: 50%;
  background: rgba(34, 211, 238, 0.16); border: 1px solid rgba(34, 211, 238, 0.5);
}
.checklist li::after {
  content: ""; position: absolute; left: 5px; top: 11px; width: 6px; height: 3px;
  border-left: 1.6px solid #67e8f9; border-bottom: 1.6px solid #67e8f9; transform: rotate(-45deg);
}

.panel {
  border-radius: 22px; border: 1px solid var(--line); padding: 24px;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.02));
  box-shadow: var(--shadow);
}
.panel-head { display: flex; align-items: center; justify-content: space-between; padding-bottom: 14px; border-bottom: 1px solid var(--line); margin-bottom: 16px; }
.panel-head span { font-size: 13px; color: var(--muted); }
.panel-head b { font-size: 14px; }
.bar-list { display: flex; flex-direction: column; gap: 12px; }
.bar-row { font-size: 13px; color: #b6c2dd; }
.bar-row .bar-label { display: flex; justify-content: space-between; margin-bottom: 6px; }
.bar-track { height: 8px; border-radius: 999px; background: rgba(255, 255, 255, 0.07); overflow: hidden; }
.bar-fill { height: 100%; border-radius: 999px; background: linear-gradient(90deg, #5b8cff, #22d3ee); }
.bar-fill.alt { background: linear-gradient(90deg, #a78bfa, #5b8cff); }
.bar-fill.alt2 { background: linear-gradient(90deg, #22d3ee, #4ade80); }

/* 场景 */
.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.scene {
  padding: 28px 24px; border-radius: var(--radius); border: 1px solid var(--line);
  background: linear-gradient(170deg, rgba(91, 140, 255, 0.1), rgba(255, 255, 255, 0.02) 55%);
}
.scene h3 { font-size: 17px; margin-bottom: 6px; }
.scene p { color: var(--muted); font-size: 14.5px; margin: 0; }

/* 下载卡片 */
.download-card {
  display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 30px; align-items: center;
  padding: 40px; border-radius: 26px; border: 1px solid rgba(91, 140, 255, 0.3);
  background:
    radial-gradient(600px 300px at 12% 0%, rgba(91, 140, 255, 0.22), transparent 60%),
    linear-gradient(150deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.015));
  box-shadow: var(--shadow);
}
.download-card h2 { font-size: clamp(24px, 2.6vw, 34px); margin-bottom: 10px; }
.download-card p { color: var(--muted); margin-bottom: 22px; }
.download-meta { display: flex; flex-wrap: wrap; gap: 10px 24px; font-size: 13.5px; color: var(--muted); margin-top: 18px; }
.download-meta span { display: inline-flex; align-items: center; gap: 8px; }
.download-meta svg { width: 16px; height: 16px; color: var(--brand-2); }
.download-side { text-align: center; border-left: 1px dashed var(--line-strong); padding-left: 30px; }
.download-side .ver { font-size: 42px; font-weight: 700; letter-spacing: -0.02em; line-height: 1; }
.download-side .ver-label { font-size: 12.5px; color: var(--muted); letter-spacing: 0.16em; text-transform: uppercase; display: block; margin: 8px 0 16px; }
.download-side .os { font-size: 13.5px; color: #b7c3dd; }

/* 步骤 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: step; }
.step {
  position: relative; padding: 26px 24px 24px; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--surface);
}
.step::before {
  counter-increment: step; content: "0" counter(step);
  display: block; font-size: 13px; font-weight: 700; color: #8fb2ff;
  letter-spacing: 0.12em; margin-bottom: 12px;
}
.step h3 { font-size: 16px; margin-bottom: 6px; }
.step p { color: var(--muted); font-size: 14.5px; margin: 0; }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq details {
  border: 1px solid var(--line); border-radius: 14px; background: var(--surface);
  padding: 0 20px; transition: border-color 0.2s ease, background 0.2s ease;
}
.faq details[open] { border-color: rgba(91, 140, 255, 0.4); background: rgba(91, 140, 255, 0.07); }
.faq summary {
  list-style: none; cursor: pointer; padding: 18px 0; font-size: 16px; font-weight: 600;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; flex: none; width: 26px; height: 26px; border-radius: 50%;
  border: 1px solid var(--line-strong); display: grid; place-items: center;
  font-size: 16px; font-weight: 400; color: #b9cdff; transition: transform 0.2s ease;
}
.faq details[open] summary::after { content: "−"; transform: rotate(180deg); }
.faq .faq-body { padding: 0 0 18px; color: var(--muted); font-size: 14.5px; }
.faq .faq-body p:last-child { margin-bottom: 0; }

/* CTA 横幅 */
.cta-band {
  position: relative; overflow: hidden; text-align: center;
  padding: 56px 30px; border-radius: 26px;
  border: 1px solid rgba(91, 140, 255, 0.3);
  background:
    radial-gradient(500px 260px at 50% 0%, rgba(91, 140, 255, 0.3), transparent 70%),
    linear-gradient(160deg, rgba(167, 139, 250, 0.12), rgba(34, 211, 238, 0.06));
}
.cta-band h2 { font-size: clamp(24px, 3vw, 34px); margin-bottom: 10px; }
.cta-band p { color: #b9c5de; margin-bottom: 24px; }
.cta-band .btn-group { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* 子页面头部 */
.page-hero { padding: 62px 0 34px; }
.page-hero h1 { font-size: clamp(30px, 3.6vw, 44px); margin-bottom: 12px; }
.page-hero .lead { color: #b4c0db; font-size: 16.5px; max-width: 720px; margin: 0; }
.breadcrumb { display: flex; gap: 8px; align-items: center; font-size: 13px; color: var(--muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--text); }
.breadcrumb span.sep { opacity: 0.5; }

/* 富文本 */
.prose { max-width: 820px; }
.prose h2 { font-size: 24px; margin-top: 42px; }
.prose h3 { font-size: 18px; margin-top: 26px; }
.prose p, .prose li { color: #b6c2dd; font-size: 15px; }
.prose a { color: #8fb2ff; border-bottom: 1px solid rgba(143, 178, 255, 0.4); }
.prose a:hover { color: #c4d7ff; }
.prose .updated { font-size: 13px; color: var(--muted); }
.note {
  padding: 16px 20px; border-radius: 14px; border: 1px solid rgba(34, 211, 238, 0.28);
  background: rgba(34, 211, 238, 0.07); font-size: 14px; color: #bcd7e4;
}
.note strong { color: #d9f5ff; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 520px; }
th, td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); }
th { background: rgba(255, 255, 255, 0.04); font-weight: 600; color: #dbe4f7; }
td { color: var(--muted); }
tbody tr:last-child td { border-bottom: 0; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--line); margin-top: 70px; padding: 56px 0 30px; background: rgba(4, 7, 14, 0.6); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 34px; }
.footer-brand p { color: var(--muted); font-size: 14px; max-width: 300px; margin: 14px 0 0; }
.footer-col h4 { font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; color: #c5d0e8; margin-bottom: 14px; }
.footer-col a { display: block; font-size: 14px; color: var(--muted); padding: 4px 0; }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-size: 13px; color: #7f8dab;
}
.footer-bottom a { color: #7f8dab; }
.footer-bottom a:hover { color: var(--text); }

/* 404 */
.error-page { min-height: 64vh; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 80px 24px; }
.error-page .code {
  font-size: clamp(80px, 16vw, 160px); font-weight: 800; line-height: 1; letter-spacing: -0.04em;
  background: linear-gradient(120deg, #5b8cff, #a78bfa, #22d3ee);
  -webkit-background-clip: text; background-clip: text; color: transparent; margin-bottom: 18px;
}
.error-page h1 { font-size: 24px; }
.error-page p { color: var(--muted); max-width: 460px; }

/* 响应式 */
@media (max-width: 980px) {
  .hero { padding: 52px 0 44px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .mockup { transform: none; }
  .grid-3, .scene-grid, .steps { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split.reverse .split-copy { order: 0; }
  .download-card { grid-template-columns: 1fr; }
  .download-side { border-left: 0; border-top: 1px dashed var(--line-strong); padding: 24px 0 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-toggle { display: block; }
  .nav {
    position: absolute; left: 16px; right: 16px; top: 66px; flex-direction: column;
    align-items: stretch; gap: 4px; padding: 12px;
    border: 1px solid var(--line); border-radius: 16px;
    background: rgba(8, 12, 22, 0.97); backdrop-filter: blur(16px);
    box-shadow: var(--shadow); display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 14px; }
  .nav a[aria-current="page"]::after { display: none; }
  .nav-cta .btn { display: none; }
  .site-header { position: sticky; }
  .header-inner { position: relative; }
}

@media (max-width: 720px) {
  body { font-size: 15.5px; }
  .section { padding: 62px 0; }
  .stats { grid-template-columns: repeat(2, 1fr); margin-top: 40px; }
  .grid-3, .grid-2, .scene-grid, .steps { grid-template-columns: 1fr; }
  .hero-actions .btn { flex: 1 1 100%; }
  .download-card { padding: 28px 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .cta-band { padding: 40px 20px; }
  .hero h1 { font-size: 34px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover, .card:hover, .mockup:hover, .tile:hover { transform: none; }
}