:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --bg-soft: #eef3fb;
  --surface: rgba(255,255,255,0.86);
  --surface-strong: #ffffff;
  --surface-dark: #0d1830;
  --surface-dark-soft: #142347;
  --ink: #0e172a;
  --ink-soft: #42506a;
  --ink-faint: #64748b;
  --line: rgba(14, 23, 42, 0.10);
  --line-strong: rgba(14, 23, 42, 0.17);
  --blue: #2563eb;
  --blue-strong: #1d4ed8;
  --blue-soft: rgba(37, 99, 235, 0.10);
  --teal: #0ea5a8;
  --teal-soft: rgba(14, 165, 168, 0.12);
  --amber: #f59e0b;
  --danger: #dc2626;
  --success: #15803d;
  --shadow-lg: 0 20px 50px rgba(13, 24, 48, 0.09);
  --shadow-md: 0 12px 30px rgba(13, 24, 48, 0.08);
  --shadow-sm: 0 8px 18px rgba(13, 24, 48, 0.05);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --max: 1160px;
  --measure: 74ch;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: linear-gradient(180deg, #f7f9fd 0%, #f5f7fb 46%, #eef3fb 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}
.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 0% 0%, rgba(37,99,235,0.10), transparent 26rem),
    radial-gradient(circle at 100% 0%, rgba(14,165,168,0.08), transparent 28rem),
    linear-gradient(rgba(37,99,235,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,0.04) 1px, transparent 1px);
  background-size: auto, auto, 100% 88px, 88px 100%;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.92), rgba(0,0,0,0.48));
}
img { max-width: 100%; display: block; }
a { color: var(--ink); text-decoration-color: rgba(37,99,235,0.25); text-underline-offset: 0.16em; }
a:hover { color: var(--blue); text-decoration-color: rgba(37,99,235,0.55); }
code, pre { font-family: "SFMono-Regular", ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace; }
code {
  background: rgba(13,24,48,0.06);
  border: 1px solid rgba(13,24,48,0.07);
  border-radius: 8px;
  padding: 0.12rem 0.38rem;
  font-size: 0.92em;
}
pre {
  overflow: auto;
  margin: 0;
  padding: 1rem 1.1rem;
  background: #0d1830;
  color: #e5eefc;
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
  line-height: 1.6;
  font-size: 0.92rem;
}
h1,h2,h3,h4 { margin: 0; line-height: 1.02; letter-spacing: -0.045em; }
h1 { font-size: clamp(3rem, 7vw, 5.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3.05rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }
p { margin: 0; color: var(--ink-soft); }
ul, ol { margin: 0; padding-left: 1.15rem; color: var(--ink-soft); }
strong { color: var(--ink); }
.shell { width: min(var(--max), calc(100% - 32px)); margin: 0 auto; }
.shell-tight { width: min(960px, calc(100% - 32px)); }
.topbar {
  position: sticky; top: 0; z-index: 40;
  padding: 14px 0 0;
}
.topbar-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 22px;
  min-height: 74px;
  padding: 14px 18px;
  border: 1px solid rgba(255,255,255,0.55);
  background: rgba(255,255,255,0.68);
  backdrop-filter: blur(18px);
  border-radius: 20px;
  box-shadow: var(--shadow-sm);
}
.brand {
  display: inline-flex; align-items: center; gap: 14px; text-decoration: none; color: var(--ink);
}
.brand-mark { width: 42px; height: 42px; border-radius: 14px; box-shadow: inset 0 0 0 1px rgba(13,24,48,0.09); background: white; }
.brand-stack { display: grid; gap: 3px; }
.brand-stack strong { font-size: 1rem; letter-spacing: -0.03em; }
.brand-stack span { color: var(--ink-faint); font-size: 0.88rem; }
.nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 8px; }
.nav-link {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 40px; padding: 0 12px; border-radius: 999px;
  text-decoration: none; color: var(--ink-soft); font-weight: 600; font-size: 0.95rem;
}
.nav-link:hover, .nav-link.active { background: rgba(37,99,235,0.09); color: var(--ink); }
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 50px; padding: 0 18px; border-radius: 999px;
  border: 1px solid transparent; text-decoration: none; font-weight: 700; letter-spacing: -0.02em;
  box-shadow: var(--shadow-sm); transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.button-primary { background: linear-gradient(180deg, #2f6df6, #1d4ed8); color: #fff; }
.button-primary:hover { color: #fff; }
.button-secondary { background: rgba(255,255,255,0.82); color: var(--ink); border-color: var(--line); }
.button-ghost { background: rgba(13,24,48,0.06); color: var(--ink); border-color: rgba(13,24,48,0.08); }
.header-cta { white-space: nowrap; }
main { padding-bottom: 72px; }
.home-hero {
  padding: 38px 0 18px;
}
.hero-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 22px;
  align-items: stretch;
}
.hero-card, .signal-panel, .panel, .mini-panel, .stat-card, .feature-card, .doc-card, .faq-card, .trust-card, .compare-table, .page-hero-card, .article-card, .legal-card, .cta-band, .install-card, .guide-card {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.75);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
}
.hero-card { padding: 32px; position: relative; overflow: hidden; }
.hero-card::after {
  content: ""; position: absolute; right: -80px; top: -80px; width: 230px; height: 230px;
  background: radial-gradient(circle, rgba(37,99,235,0.12), transparent 70%);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 30px; padding: 0 11px; border-radius: 999px;
  background: linear-gradient(180deg, rgba(37,99,235,0.10), rgba(37,99,235,0.06));
  color: var(--blue); font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 800;
}
.hero-card h1 { max-width: 11ch; margin-top: 18px; }
.lead { font-size: 1.16rem; max-width: 62ch; margin-top: 18px; }
.hero-proof {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px;
}
.proof-pill {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 40px; padding: 0 14px; border-radius: 999px;
  background: rgba(255,255,255,0.82); border: 1px solid rgba(13,24,48,0.08); color: var(--ink);
  box-shadow: var(--shadow-sm); font-size: 0.94rem; font-weight: 600;
}
.proof-pill::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: linear-gradient(180deg, var(--teal), #22c55e); box-shadow: 0 0 0 4px rgba(14,165,168,0.12); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.hero-meta { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 14px; margin-top: 28px; }
.mini-panel { padding: 16px 16px 18px; border-radius: 18px; }
.mini-panel h3 { font-size: 1rem; margin-bottom: 6px; }
.mini-panel p { font-size: 0.95rem; }
.signal-panel {
  position: relative; overflow: hidden; padding: 24px;
  background: linear-gradient(160deg, #081126 0%, #0f1b39 50%, #142347 100%);
  color: #edf3ff; border: 1px solid rgba(255,255,255,0.14);
}
.signal-panel::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 85% 12%, rgba(14,165,168,0.22), transparent 18rem),
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: auto, 100% 44px, 44px 100%;
  opacity: 0.85;
  pointer-events: none;
}
.signal-panel > * { position: relative; z-index: 1; }
.signal-panel h2 { font-size: clamp(1.7rem, 2.5vw, 2.6rem); color: #fff; }
.signal-panel p, .signal-panel li { color: rgba(237,243,255,0.82); }
.signal-badge-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
.signal-badge {
  min-height: 30px; display: inline-flex; align-items: center; padding: 0 10px; border-radius: 999px;
  background: rgba(255,255,255,0.08); color: #cde2ff; font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 800;
}
.scan-rail { display: grid; gap: 14px; margin-top: 24px; }
.scan-step {
  display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start;
  padding: 14px 16px; border-radius: 18px; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.10);
}
.scan-number {
  width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px;
  background: linear-gradient(180deg, rgba(37,99,235,0.94), rgba(14,165,168,0.88)); color: #fff; font-weight: 800; font-size: 0.92rem;
  box-shadow: 0 8px 18px rgba(37,99,235,0.28);
}
.scan-step h3 { color: #fff; font-size: 1.06rem; margin-bottom: 4px; }
.signal-kv { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.signal-kv span {
  display: inline-flex; align-items: center; min-height: 28px; padding: 0 10px; border-radius: 999px;
  background: rgba(255,255,255,0.08); color: #d8e8ff; font-size: 0.8rem;
}
.signal-output { margin-top: 18px; }
.signal-output pre { background: rgba(5,11,23,0.74); box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08); }
.section { padding: 26px 0; }
.section-head { max-width: 760px; margin-bottom: 20px; }
.section-head h2 { margin-top: 14px; }
.section-head p { margin-top: 12px; font-size: 1.05rem; }
.card-grid-4, .card-grid-3, .card-grid-2 { display: grid; gap: 18px; }
.card-grid-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.card-grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.card-grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.stat-card, .feature-card, .doc-card, .faq-card, .trust-card, .install-card, .guide-card, .article-card, .legal-card { padding: 24px; }
.stat-card h3, .feature-card h3, .doc-card h3, .faq-card h3, .trust-card h3, .guide-card h3, .install-card h3, .article-card h3 { margin-bottom: 10px; }
.stat-card p, .feature-card p, .doc-card p, .faq-card p, .trust-card p, .guide-card p, .install-card p { font-size: 0.98rem; }
.stat-card strong { display: block; font-size: 1.15rem; margin-bottom: 8px; letter-spacing: -0.03em; }
.dark-band {
  padding: 28px; border-radius: var(--radius-xl);
  background: linear-gradient(160deg, rgba(13,24,48,0.98), rgba(20,35,71,0.98)); color: #f4f8ff;
  box-shadow: var(--shadow-lg);
}
.dark-band h2, .dark-band h3 { color: #fff; }
.dark-band p, .dark-band li { color: rgba(244,248,255,0.84); }
.dark-band .button-secondary { background: rgba(255,255,255,0.10); color: #fff; border-color: rgba(255,255,255,0.16); }
.comparison-wrap { overflow: auto; }
.compare-table {
  width: 100%; border-collapse: collapse; overflow: hidden; border-radius: var(--radius-xl);
}
.compare-table th, .compare-table td {
  padding: 18px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top;
}
.compare-table thead th { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-faint); background: rgba(37,99,235,0.04); }
.compare-table tbody tr:last-child td { border-bottom: 0; }
.compare-yes { color: var(--success); font-weight: 700; }
.compare-no { color: var(--danger); font-weight: 700; }
.link-card-grid { display: grid; gap: 18px; grid-template-columns: repeat(4, minmax(0,1fr)); }
.link-card {
  display: grid; gap: 14px; min-height: 240px; padding: 24px; border-radius: 22px;
  background: linear-gradient(180deg, rgba(255,255,255,0.94), rgba(255,255,255,0.84)); border: 1px solid rgba(255,255,255,0.78); box-shadow: var(--shadow-md);
}
.link-card .card-tag {
  display: inline-flex; align-items: center; justify-content: center; width: fit-content;
  min-height: 28px; padding: 0 10px; border-radius: 999px; background: var(--blue-soft); color: var(--blue);
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 800;
}
.link-card p { flex: 1; }
.page-hero { padding: 40px 0 18px; }
.page-hero-card { padding: 28px 30px 32px; }
.page-hero-card h1 { margin-top: 14px; max-width: 14ch; }
.page-hero-card .lead { margin-top: 16px; max-width: var(--measure); }
.page-grid { display: grid; gap: 18px; grid-template-columns: 1.05fr 0.95fr; align-items: start; }
.sticky-card { position: sticky; top: 104px; }
.callout {
  padding: 18px 18px; border-radius: 18px; background: rgba(37,99,235,0.07); border: 1px solid rgba(37,99,235,0.12);
}
.kv-list { display: grid; gap: 12px; }
.kv-item {
  display: grid; grid-template-columns: 140px 1fr; gap: 12px; padding: 14px 0; border-top: 1px solid var(--line);
}
.kv-item:first-child { border-top: 0; padding-top: 0; }
.kv-item strong { font-size: 0.92rem; letter-spacing: -0.02em; }
.step-grid { display: grid; gap: 18px; grid-template-columns: repeat(3, minmax(0,1fr)); }
.step-card { padding: 24px; border-radius: 22px; background: rgba(255,255,255,0.86); border: 1px solid rgba(255,255,255,0.78); box-shadow: var(--shadow-md); }
.step-number {
  width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 14px;
  background: linear-gradient(180deg, #2f6df6, #1d4ed8); color: #fff; font-weight: 800;
}
.cta-band {
  margin-top: 18px; padding: 28px; display: grid; gap: 18px; align-items: center; grid-template-columns: 1.1fr auto;
  background: linear-gradient(180deg, rgba(232,241,255,0.95), rgba(245,249,255,0.92));
}
.cta-band h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); }
.site-footer {
  padding: 50px 0 60px; border-top: 1px solid rgba(14,23,42,0.08); background: rgba(255,255,255,0.45);
}
.footer-grid { display: grid; grid-template-columns: 1.2fr repeat(4, minmax(0,1fr)); gap: 22px; }
.footer-intro h2 { font-size: 1.4rem; margin-bottom: 10px; }
.footer-grid h3 { font-size: 0.98rem; margin-bottom: 12px; }
.footer-grid ul { list-style: none; padding: 0; display: grid; gap: 8px; }
.footer-grid li a { color: var(--ink-soft); text-decoration: none; }
.footer-grid li a:hover { color: var(--blue); }
.article-shell { display: grid; gap: 20px; grid-template-columns: 280px minmax(0,1fr); align-items: start; }
.toc-card {
  position: sticky; top: 104px; padding: 22px; border-radius: 22px; background: rgba(255,255,255,0.80); border: 1px solid rgba(255,255,255,0.78); box-shadow: var(--shadow-sm);
}
.toc-card h3 { font-size: 1rem; margin-bottom: 12px; }
.toc-card ul { list-style: none; padding: 0; display: grid; gap: 9px; }
.toc-card a { text-decoration: none; color: var(--ink-soft); }
.toc-card a:hover { color: var(--blue); }
.article-card { padding: 30px; }
.article-card section + section { margin-top: 32px; padding-top: 28px; border-top: 1px solid var(--line); }
.article-card p + p, .article-card p + ul, .article-card ul + p, .article-card ol + p, .article-card p + pre { margin-top: 14px; }
.article-card h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); margin-bottom: 12px; }
.article-card h3 { margin-bottom: 10px; }
.note { padding: 16px 18px; border-left: 4px solid var(--blue); background: rgba(37,99,235,0.06); border-radius: 16px; }
.legal-card { max-width: 920px; margin: 0 auto; }
.legal-card section + section { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--line); }
.page-actions, .stack-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.hero-links { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 16px; }
.hero-links a { color: var(--ink-soft); font-weight: 600; text-decoration: none; }
.hero-links a:hover { color: var(--blue); }
.caption { font-size: 0.92rem; color: var(--ink-faint); }
.table-note { margin-top: 12px; font-size: 0.94rem; }
.notice-grid { display: grid; gap: 18px; grid-template-columns: repeat(3, minmax(0,1fr)); }
.badge-line { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.badge-line span {
  display: inline-flex; align-items: center; min-height: 32px; padding: 0 12px; border-radius: 999px;
  background: rgba(13,24,48,0.06); border: 1px solid rgba(13,24,48,0.08); color: var(--ink); font-size: 0.88rem; font-weight: 600;
}
.article-kicker { color: var(--blue); font-size: 0.84rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 800; }
hr.soft { border: 0; border-top: 1px solid var(--line); margin: 28px 0; }
@media (max-width: 1080px) {
  .hero-layout, .page-grid, .article-shell, .footer-grid, .cta-band { grid-template-columns: 1fr; }
  .card-grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .link-card-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .step-grid, .notice-grid { grid-template-columns: 1fr; }
  .hero-meta { grid-template-columns: 1fr; }
  .sticky-card, .toc-card { position: static; }
}
@media (max-width: 820px) {
  .topbar-inner { grid-template-columns: 1fr; justify-items: start; }
  .nav { justify-content: start; }
  .header-cta { width: 100%; }
  .card-grid-4, .card-grid-3, .card-grid-2, .link-card-grid { grid-template-columns: 1fr; }
  .shell { width: min(var(--max), calc(100% - 22px)); }
  .hero-card, .signal-panel, .page-hero-card, .article-card, .legal-card, .cta-band, .stat-card, .feature-card, .doc-card, .faq-card, .trust-card, .install-card, .guide-card { padding: 22px; }
  h1 { font-size: clamp(2.45rem, 15vw, 4rem); }
  .kv-item { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .hero-actions .button, .page-actions .button, .stack-actions .button { width: 100%; }
  .proof-pill { width: 100%; justify-content: center; }
}