/* ── Design Tokens ── */
:root {
  --bg: #ffffff;
  --bg-alt: #f7f8fa;
  --surface: #ffffff;
  --ink: #1a1a1a;
  --ink-2: #555;
  --ink-3: #8a8a8a;
  --accent: #16baaa;
  --accent-hover: #13a096;
  --accent-soft: rgba(22,186,170,.07);
  --border: #e8e8e8;
  --border-light: #f0f0f0;
  --code-bg: #1c1c1e;
  --code-text: #e4e4e7;
  --nav-h: 64px;
  --max-w: 1100px;
  --max-w-narrow: 720px;
  --radius: 3px;
  --font-en: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: -apple-system, 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Menlo', 'Monaco', 'Consolas', 'Courier New', monospace;
  --font-zh: -apple-system, 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
}

/* ── Reset ── */
*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
:target { scroll-margin-top: calc(var(--nav-h) + 16px); }
body {
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--ink);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

/* ── Nav ── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow .3s;
}
.nav.scrolled { box-shadow: 0 1px 16px rgba(0,0,0,.05); }
.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  padding: 0 36px; height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-en);
  font-size: 20px; font-weight: 700;
  letter-spacing: -.02em; color: var(--ink);
}
.nav-logo span { color: var(--accent); }
.nav-links {
  display: flex; align-items: center; gap: 28px;
  list-style: none;
}
.nav-links a {
  font-size: 13.5px; font-weight: 500;
  color: var(--ink-2); letter-spacing: .01em;
  transition: color .2s; position: relative;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after {
  content: ''; position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 1.5px; background: var(--accent); border-radius: 1px;
}

/* Mobile toggle */
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; background: none; border: none; padding: 4px;
}
.nav-toggle span {
  display: block; width: 20px; height: 2px;
  background: var(--ink); border-radius: 2px; transition: all .3s;
}

/* ── Layout ── */
html.home { scroll-snap-type: y mandatory; }
main { padding-top: var(--nav-h); flex: 1 0 auto; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 36px; }
.narrow { max-width: var(--max-w-narrow); margin: 0 auto; padding: 0 36px; }
.text-center { text-align: center; }

/* ── Section ── */
.section { padding: 96px 0; }
.section-sm { padding: 64px 0; }
.snap {
  min-height: calc(100vh - var(--nav-h));
  display: flex; align-items: center;
  scroll-snap-align: start;
  scroll-margin-top: var(--nav-h);
  padding: 0 !important;
}
.snap > .container { width: 100%; }
.section-label {
  font-family: var(--font-en);
  font-size: 11px; font-weight: 600;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 14px;
}
.section-title {
  font-family: var(--font-zh);
  font-size: 28px; font-weight: 700;
  letter-spacing: -.02em; line-height: 1.3;
  margin-bottom: 14px;
}
.section-desc {
  font-size: 15px; color: var(--ink-2);
  max-width: 520px; line-height: 1.7;
}

/* ── Hero ── */
.hero {
  min-height: calc(100vh - var(--nav-h));
  display: flex; align-items: center;
  position: relative; overflow: hidden;
  scroll-snap-align: start;
  scroll-margin-top: var(--nav-h);
}
.hero::before {
  content: ''; position: absolute;
  top: -30%; right: -15%; width: 600px; height: 600px;
  background: radial-gradient(circle, var(--accent-soft) 0%, transparent 70%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; padding: 60px 0; }
.hero h1 {
  font-family: var(--font-zh);
  font-size: clamp(38px, 5.5vw, 56px);
  font-weight: 700; line-height: 1.18;
  letter-spacing: -.02em; margin-bottom: 22px;
  max-width: 620px;
}
.hero h1 .accent { color: var(--accent); }
.hero-tag {
  display: inline-block; font-size: 12px; font-weight: 500;
  color: var(--accent); background: var(--accent-soft);
  padding: 4px 14px; border-radius: 20px; margin-bottom: 18px;
}
.hero-sub {
  font-size: 16px; color: var(--ink-2);
  max-width: 480px; line-height: 1.75; margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── Value Full ── */
.value-full {
  min-height: calc(100vh - var(--nav-h));
  display: flex; align-items: center;
  position: relative; overflow: hidden;
  scroll-snap-align: start;
  scroll-margin-top: var(--nav-h);
}
.value-full-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  width: 100%;
}
.value-full-reverse {
  direction: rtl;
}
.value-full-reverse > * {
  direction: ltr;
}
.value-full-text h2 {
  font-family: var(--font-zh);
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 700; line-height: 1.18;
  letter-spacing: -.02em; margin-bottom: 22px;
}
.value-full-text p {
  font-size: 16px; color: var(--ink-2);
  line-height: 1.75;
}
.value-full-tag {
  display: inline-block; font-size: 12px; font-weight: 500;
  color: var(--accent); background: var(--accent-soft);
  padding: 4px 14px; border-radius: 20px; margin-bottom: 18px;
}
.value-full-note {
  margin-top: 20px;
  font-size: 13.5px;
  color: var(--ink-3);
}
.value-full-visual {
  display: flex; align-items: center; justify-content: center;
  min-width: 0;
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 11px 26px; font-size: 14px; font-weight: 500;
  border-radius: var(--radius); transition: all .2s; letter-spacing: .01em;
}
.btn-primary { background: var(--ink); color: var(--bg); }
.btn-primary:hover { background: #333; transform: translateY(-1px); }
.btn-outline { border: 1px solid var(--border); color: var(--ink); background: transparent; }
.btn-outline:hover { border-color: var(--ink); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--bg-alt); color: var(--ink); }
.btn-secondary:hover { background: #ecedf0; transform: translateY(-1px); }

/* ── Cards ── */
.cards { display: grid; gap: 20px; }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.cards-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  padding: 28px 24px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface);
  transition: border-color .2s, box-shadow .2s;
}
.card:hover { border-color: #ccc; box-shadow: 0 2px 20px rgba(0,0,0,.04); }
.card-icon {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px; background: var(--accent-soft); color: var(--accent);
  font-size: 15px; font-weight: 700; margin-bottom: 16px;
  font-family: var(--font-en);
}
.card h3 { font-size: 15px; font-weight: 600; margin-bottom: 8px; letter-spacing: -.01em; }
.card p { font-size: 14px; color: var(--ink-2); line-height: 1.65; }

/* ── Steps ── */
.steps { display: flex; gap: 48px; counter-reset: step; }
.step { flex: 1; position: relative; counter-increment: step; }
.step::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-en); font-size: 36px; font-weight: 300;
  color: var(--border); line-height: 1; margin-bottom: 14px; display: block;
}
.step h3 { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--ink-2); line-height: 1.65; }

/* ── Flow Diagram ── */
.flow {
  display: flex; align-items: flex-start; justify-content: center;
  gap: 0; flex-wrap: wrap;
}
.flow-step { text-align: center; padding: 20px 16px; min-width: 130px; }
.flow-step-num {
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 12px;
  background: var(--ink); color: var(--bg);
  font-family: var(--font-en); font-size: 15px; font-weight: 600;
}
.flow-step h4 { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.flow-step p { font-size: 13px; color: var(--ink-3); line-height: 1.5; }
.flow-arrow {
  font-size: 18px; color: var(--border); padding: 28px 6px 0;
}

/* Step number in cards */
.step-num {
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  background: var(--border-light); color: var(--ink-3);
  font-family: var(--font-en); font-size: 15px; font-weight: 600;
}

/* ── Feature Row ── */
.feature-row {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 56px; align-items: center;
}
.feature-text h2 { margin-bottom: 14px; }
.feature-text p { margin-bottom: 20px; color: var(--ink-2); line-height: 1.75; }
.feature-list { display: flex; flex-direction: column; gap: 10px; }
.feature-list li {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 14px; color: var(--ink-2);
}
.feature-list li::before {
  content: ''; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0; margin-top: 8px;
}
.feature-visual {
  background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: 10px; padding: 28px;
}

/* ── Compare Table ── */
.compare-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.compare-table th, .compare-table td {
  padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border-light);
}
.compare-table thead th {
  font-weight: 600; color: var(--ink); border-bottom: 2px solid var(--ink);
  font-size: 12.5px;
}
.compare-table tbody tr:hover { background: var(--accent-soft); }
.highlight-yes { color: var(--accent); font-weight: 600; }
.highlight-no { color: var(--ink-3); }

/* ── Code Block ── */
.code-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  font-family: var(--font-mono), 'PingFang SC', 'Microsoft YaHei', monospace;
  font-size: 13px;
  line-height: 1.7;
  min-width: 0;
}
.code-block pre {
  padding: 18px;
  overflow-x: auto;
  color: var(--ink);
  margin: 0;
  min-width: 0;
}
.code-block code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
}
.code-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 18px; border-bottom: 1px solid var(--border);
}
.code-lang {
  font-size: 11px; font-weight: 500;
  color: var(--ink-3); text-transform: uppercase; letter-spacing: .08em;
  font-family: var(--font-body);
}
.code-copy {
  font-size: 11px;
  color: var(--ink-3);
  cursor: pointer;
  transition: color .2s;
  background: none;
  border: none;
  font-family: var(--font-body);
}
.code-copy:hover { color: var(--ink); }

/* ── Code Tabs ── */
.code-tabs { margin: 20px 0; }
.code-tab-bar {
  display: flex;
  align-items: center;
  gap: 0;
  border-bottom: 1px solid var(--border);
  padding: 0 4px;
}
.code-tab {
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-3);
  cursor: pointer;
  border: none;
  border-bottom: 2px solid transparent;
  background: none;
  font-family: var(--font-body);
  transition: all .2s;
  margin-bottom: -1px;
}
.code-tab:hover { color: var(--ink); }
.code-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.code-tab-copy {
  margin-left: auto;
  padding: 5px 12px;
  font-size: 12px;
  color: var(--ink-3);
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-body);
  transition: color .2s;
  border-radius: var(--radius);
}
.code-tab-copy:hover { color: var(--ink); }
.code-tab-panel { display: none; }
.code-tab-panel.active { display: block; }
.code-tab-panel .code-block { border-radius: 0 0 6px 6px; border-top: none; margin: 0; }

/* ── Inline Code ── */
code {
  font-family: var(--font-mono); font-size: .88em;
  background: var(--bg-alt); padding: 2px 6px;
  border-radius: 3px; color: var(--accent);
}

/* ── Table ── */
.table-wrap { overflow-x: auto; margin: 24px 0; min-width: 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
thead th {
  text-align: left; font-weight: 600;
  padding: 12px 16px; border-bottom: 2px solid var(--ink);
  font-size: 13px; white-space: nowrap;
}
tbody td { padding: 11px 16px; border-bottom: 1px solid var(--border-light); vertical-align: top; text-align: left; }
tbody tr:hover { background: var(--accent-soft); }

/* ── Doc Badge ── */
.doc-badge {
  display: inline-block; font-size: 11px; padding: 2px 8px;
  border-radius: 3px; font-weight: 500;
}
.doc-badge-yes { background: rgba(46,125,50,.1); color: #2e7d32; }
.doc-badge-no { background: rgba(230,108,0,.1); color: #c55a00; }

/* ── FAQ / Accordion ── */
.faq-list { max-width: 640px; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q {
  width: 100%; text-align: left; padding: 20px 0;
  font-size: 15px; font-weight: 600;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  transition: color .2s;
}
.faq-q:hover { color: var(--accent); }
.faq-q::after {
  content: '+'; font-size: 20px; font-weight: 300;
  color: var(--ink-3); flex-shrink: 0; transition: transform .25s;
}
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
}
.faq-item.open .faq-a { max-height: 300px; }
.faq-a-inner { padding: 0 0 20px; font-size: 14px; color: var(--ink-2); line-height: 1.7; }

/* ── Pricing ── */
.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.price-card {
  padding: 36px 28px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); position: relative;
  transition: border-color .2s, box-shadow .2s;
  display: flex; flex-direction: column;
}
.price-card:hover { border-color: #ccc; box-shadow: 0 2px 20px rgba(0,0,0,.04); }
.price-card.featured { border-color: var(--ink); box-shadow: 0 4px 32px rgba(0,0,0,.06); }
.price-badge {
  position: absolute; top: -11px; left: 28px;
  background: var(--accent); color: #fff;
  font-size: 11px; font-weight: 600; padding: 3px 12px;
  border-radius: 3px; letter-spacing: .02em;
}
.price-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.price-amount {
  font-family: var(--font-en); font-size: 28px; font-weight: 600;
  letter-spacing: -.02em; margin-bottom: 4px;
  color: var(--ink);
}
.price-amount small { font-size: 14px; font-weight: 400; color: var(--ink-3); }
.price-card.featured .price-amount { color: var(--accent); }
.price-card.featured .price-amount small { font-size: 16px; }
.price-card .subtitle { font-size: 13px; color: var(--ink-3); margin-bottom: 16px; }
.promo-highlight {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.6;
  margin-bottom: 24px;
  letter-spacing: -.01em;
}
.price-note { font-size: 13.5px; color: var(--ink-2); margin-bottom: 24px; line-height: 1.65; }
.price-features { list-style: none; margin-bottom: 28px; flex: 1; }
.price-features li {
  padding: 6px 0; font-size: 13.5px;
  display: flex; align-items: center; gap: 10px;
}
.price-features li::before {
  content: ''; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0;
}
.price-features li strong { font-weight: 600; }
.price-card .btn { margin-top: auto; }

/* ── Footer ── */
footer { border-top: 1px solid var(--border); padding: 36px 0; margin-top: 0; scroll-snap-align: start; }
.footer-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 36px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12.5px; color: var(--ink-3);
}
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--ink-3); transition: color .2s; }
.footer-links a:hover { color: var(--ink); }
.footer-icp { font-size: 11.5px; color: var(--ink-3); }

/* ── Page Header ── */
.page-header {
  padding: 72px 0 48px; border-bottom: 1px solid var(--border); margin-bottom: 56px;
}
.page-header-center { text-align: center; }
.page-header h1 {
  font-family: var(--font-zh);
  font-size: clamp(28px, 4vw, 38px); font-weight: 700;
  letter-spacing: -.02em; line-height: 1.25; margin-bottom: 12px;
}
.page-header p { font-size: 15px; color: var(--ink-2); max-width: 480px; line-height: 1.7; }
.page-header-center p { margin: 0 auto; }

/* ─ Doc Content ─ */
.doc-content h2 {
  font-size: 20px; font-weight: 700; margin-top: 48px; margin-bottom: 18px;
  letter-spacing: -.01em; padding-bottom: 12px; border-bottom: 1px solid var(--border);
}
.doc-content h3 { font-size: 16px; font-weight: 600; margin-top: 32px; margin-bottom: 12px; }
.doc-content h4 { font-size: 14px; font-weight: 600; margin-top: 24px; margin-bottom: 10px; }
.doc-content p { margin-bottom: 14px; color: var(--ink-2); }
.doc-content > p { color: var(--ink); }
.doc-content ul, .doc-content ol { margin: 0 0 16px 20px; color: var(--ink-2); }
.doc-content li { margin-bottom: 6px; font-size: 14.5px; }
.doc-content hr { border: none; border-top: 1px solid var(--border); margin: 40px 0; }
.doc-content blockquote {
  border-left: 3px solid var(--accent); padding: 12px 20px; margin: 20px 0;
  background: var(--accent-soft); border-radius: 0 4px 4px 0;
  font-size: 14px; color: var(--ink-2);
}
.doc-content .code-block { margin: 20px 0; }

/* ── Doc Sidebar Layout ── */
.doc-layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}
.doc-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
}
.doc-sidebar-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.doc-sidebar-nav a {
  display: block;
  padding: 7px 14px;
  font-size: 13px;
  color: var(--ink-3);
  border-radius: var(--radius);
  transition: all .2s;
  border-left: 2px solid transparent;
}
.doc-sidebar-nav a:hover {
  color: var(--ink);
  background: var(--bg-alt);
}
.doc-sidebar-nav a.active {
  color: var(--accent);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 500;
}

/* ── Legal Content ── */
.legal-content h2 { font-size: 18px; font-weight: 600; margin-top: 40px; margin-bottom: 14px; }
.legal-content h3 { font-size: 15px; font-weight: 600; margin-top: 28px; margin-bottom: 10px; }
.legal-content p { margin-bottom: 14px; color: var(--ink-2); font-size: 14.5px; }
.legal-content ul { margin: 0 0 14px 20px; color: var(--ink-2); }
.legal-content li { margin-bottom: 6px; font-size: 14px; }

/* ── Contact ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; max-width: 640px; }
.contact-card {
  padding: 32px 24px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); text-align: center;
  transition: border-color .2s, box-shadow .2s;
}
.contact-card:hover { border-color: #ccc; box-shadow: 0 2px 20px rgba(0,0,0,.04); }
.contact-card h3 { font-size: 13px; font-weight: 600; color: var(--ink-3); margin-bottom: 8px; letter-spacing: .04em; }
.contact-card .contact-value { font-size: 20px; font-weight: 600; letter-spacing: -.01em; }
.contact-card .contact-value a { transition: color .2s; }
.contact-card .contact-value a:hover { color: var(--accent); }

.contact-item {
  padding: 24px 0; border-bottom: 1px solid var(--border-light);
}
.contact-item:first-child { border-top: 1px solid var(--border-light); }
.contact-label {
  font-size: 11px; font-weight: 600; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px;
}

/* ── Download ── */
.download-box {
  display: inline-flex; align-items: center; gap: 24px;
  border-radius: 12px;
  padding: 28px 36px;
  transition: border-color .2s, box-shadow .2s;
}
.download-box:hover { border-color: #ccc; box-shadow: 0 4px 20px rgba(0,0,0,.05); }
.download-box-icon {
  width: 48px; height: 48px;
  object-fit: contain;
}
.download-card {
  cursor: pointer;
  transition: border-color .2s, box-shadow .2s;
}
.download-card:hover { border-color: #ccc; box-shadow: 0 4px 20px rgba(0,0,0,.06); }
.download-card:hover .download-box-icon { opacity: .85; }
.download-card h3 { color: var(--ink); }

/* ── Animations ── */
.fade-up {
  opacity: 0; transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease;
}
.fade-up.visible { opacity: 1; transform: none; }
.delay-1 { transition-delay: .1s; }
.delay-2 { transition-delay: .2s; }
.delay-3 { transition-delay: .3s; }

/* ── Divider ── */
.divider { width: 40px; height: 2px; background: var(--border); margin: 48px 0; }

/* ── Responsive ── */
@media (max-width: 768px) {
  html.home { scroll-snap-type: none; }
  .architecture-svg-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    max-width: 100%;
  }
  .architecture-svg-wrap svg {
    min-width: 720px;
    height: auto;
  }
  .flow { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .flow-arrow { display: none; }
  .flow-step { padding: 16px 8px; }
  .nav-links {
    display: none; position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--bg); flex-direction: column;
    padding: 12px 36px 20px; gap: 12px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 16px rgba(0,0,0,.06);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .cards-3, .pricing-grid { grid-template-columns: 1fr; }
  .cards-2 { grid-template-columns: 1fr; }
  .steps { flex-direction: column; gap: 32px; }
  .feature-row { grid-template-columns: 1fr; gap: 32px; }
  .feature-visual { background: none; border: none; padding: 0; }
  .hero h1 { font-size: 30px; }
  .hero-sub { max-width: 100%; }
  .section { padding: 64px 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
  .container, .narrow { padding: 0 20px; }
  .nav-inner { padding: 0 20px; }
  .compare-table { font-size: 12px; }
  .compare-table th, .compare-table td { padding: 8px 6px; }
  .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .doc-layout { grid-template-columns: 1fr; gap: 0; }
  .doc-sidebar { display: none; }
  .doc-content pre, .doc-content code { white-space: pre-wrap; word-break: break-all; }
  .doc-content table { table-layout: fixed; }
  .doc-content td, .doc-content th { word-break: break-word; }
  .value-full { min-height: calc(100vh - var(--nav-h)); scroll-snap-align: start; }
  .contact-email { padding: 80px 24px 48px; }
  .value-full-inner { grid-template-columns: 1fr; gap: 32px; text-align: left; }
  .value-full-reverse { direction: ltr; }
  .value-full-text h2 { font-size: 28px; }
  .value-full-text p { max-width: 100%; }
  .value-full-tag { margin-bottom: 12px; }
  .value-full-visual { justify-content: flex-start; }
  .value-full-visual .feature-list { text-align: left; display: flex; flex-direction: column; gap: 12px; }
  .download-box { padding: 20px 16px; gap: 16px; }
  .page-header h1 { font-size: 28px; }
  .promo-highlight { font-size: 13px; }
}
@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}