:root {
  --ink: #172234;
  --muted: #5f6b7a;
  --line: #dce3ea;
  --soft: #f4f7fa;
  --white: #ffffff;
  --blue: #1769e0;
  --blue-dark: #0e4fae;
  --teal: #008f82;
  --orange: #ff9900;
  --shadow: 0 18px 55px rgba(26, 45, 71, .13);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
  letter-spacing: 0;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }

.container { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }
.skip-link { position: fixed; left: 12px; top: -80px; z-index: 100; padding: 10px 14px; background: var(--ink); color: #fff; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(220,227,234,.85); backdrop-filter: blur(12px); }
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; font-size: 16px; font-weight: 700; white-space: nowrap; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; color: #fff; background: var(--ink); font-weight: 800; border-radius: 7px; position: relative; }
.brand-mark::after { content: ""; position: absolute; width: 13px; height: 3px; right: -3px; bottom: 5px; background: var(--orange); border-radius: 3px; transform: rotate(-18deg); }
.nav-links { display: flex; align-items: center; gap: 25px; }
.nav-links a { color: #39485d; text-decoration: none; font-size: 14px; }
.nav-links a:hover { color: var(--blue); }
.button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 18px; border: 1px solid var(--blue); border-radius: 6px; background: var(--blue); color: #fff; text-decoration: none; font-weight: 650; cursor: pointer; transition: .18s ease; }
.button:hover { background: var(--blue-dark); border-color: var(--blue-dark); transform: translateY(-1px); }
.button.secondary { color: var(--ink); background: transparent; border-color: #bfc9d5; }
.button.secondary:hover { background: var(--soft); border-color: #98a6b7; }
.nav-cta { min-height: 38px; padding: 7px 14px; }

.hero { padding: 76px 0 54px; background: linear-gradient(180deg, #f4f8ff 0, #fff 80%); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: .88fr 1.12fr; gap: 54px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 15px; color: var(--blue-dark); font-size: 14px; font-weight: 700; }
.eyebrow::before { content: ""; width: 22px; height: 3px; background: var(--orange); }
h1, h2, h3 { line-height: 1.25; margin-top: 0; }
h1 { max-width: 640px; margin-bottom: 20px; font-size: clamp(38px, 5vw, 64px); font-weight: 760; }
.hero-copy { max-width: 590px; margin: 0 0 28px; color: var(--muted); font-size: 18px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.trust-row { display: flex; gap: 16px 26px; margin: 30px 0 0; padding: 0; list-style: none; flex-wrap: wrap; color: #4e5c6e; font-size: 13px; }
.trust-row li { display: flex; align-items: center; gap: 7px; }
.trust-row li::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 0 4px rgba(0,143,130,.1); }
.product-frame { position: relative; background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 10px; box-shadow: var(--shadow); }
.product-frame img { width: 100%; aspect-ratio: 16 / 8.65; object-fit: cover; object-position: top left; border: 1px solid #e5eaf0; }
.frame-label { position: absolute; left: 28px; bottom: -18px; padding: 10px 14px; color: #fff; background: var(--ink); border-radius: 5px; font-size: 13px; box-shadow: 0 10px 24px rgba(23,34,52,.2); }

.metrics-band { padding: 22px 0; background: var(--ink); color: #fff; }
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); }
.metric { padding: 8px 26px; border-left: 1px solid rgba(255,255,255,.15); }
.metric:first-child { border-left: 0; padding-left: 0; }
.metric strong { display: block; margin-bottom: 2px; font-size: 20px; }
.metric span { color: #b8c2d0; font-size: 13px; }

.section { padding: 92px 0; }
.section.alt { background: var(--soft); }
.section-head { max-width: 720px; margin-bottom: 42px; }
.section-head h2, .split-copy h2 { margin-bottom: 15px; font-size: clamp(30px, 4vw, 44px); }
.section-head p, .split-copy > p { color: var(--muted); margin: 0; font-size: 16px; }
.cap-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.cap-card { min-height: 240px; padding: 25px; border: 1px solid var(--line); border-top: 3px solid var(--blue); background: #fff; border-radius: 7px; }
.cap-card:nth-child(2) { border-top-color: var(--teal); }
.cap-card:nth-child(3) { border-top-color: var(--orange); }
.cap-card:nth-child(4) { border-top-color: #6b58c9; }
.cap-number { display: block; margin-bottom: 34px; color: #94a1b2; font: 700 12px/1 monospace; }
.cap-card h3 { margin-bottom: 10px; font-size: 19px; }
.cap-card p { color: var(--muted); margin: 0; font-size: 14px; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.screenshot-stack { position: relative; padding: 0 24px 24px 0; }
.screenshot-stack::after { content: ""; position: absolute; inset: 24px 0 0 24px; z-index: 0; background: #dfeafb; border-radius: 8px; }
.screenshot-stack img { position: relative; z-index: 1; width: 100%; border: 1px solid var(--line); border-radius: 7px; box-shadow: var(--shadow); }
.feature-list { display: grid; gap: 21px; margin: 28px 0 0; }
.feature-item { display: grid; grid-template-columns: 34px 1fr; gap: 13px; }
.feature-icon { width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid #bcd2f4; border-radius: 6px; color: var(--blue); font-size: 13px; font-weight: 800; }
.feature-item h3 { margin: 1px 0 3px; font-size: 17px; }
.feature-item p { margin: 0; color: var(--muted); font-size: 14px; }

.permissions { display: grid; grid-template-columns: .82fr 1.18fr; gap: 70px; }
.permission-table { overflow: hidden; border: 1px solid var(--line); border-radius: 7px; background: #fff; }
.permission-row { display: grid; grid-template-columns: 170px 1fr; border-top: 1px solid var(--line); }
.permission-row:first-child { border-top: 0; }
.permission-row > div { padding: 18px 20px; }
.permission-row .label { background: #f7f9fb; font-weight: 700; }
.permission-row p { margin: 0; color: var(--muted); font-size: 14px; }
.notice { margin-top: 24px; padding: 18px 20px; border-left: 4px solid var(--orange); background: #fff8ea; color: #594a31; font-size: 14px; }

.gallery { display: grid; grid-template-columns: 1.35fr .65fr; gap: 18px; }
.gallery-main, .gallery-side figure { margin: 0; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; background: #fff; }
.gallery-main img { width: 100%; aspect-ratio: 16/9; object-fit: cover; object-position: top; }
.gallery-side { display: grid; gap: 18px; }
.gallery-side img { width: 100%; aspect-ratio: 16/8.2; object-fit: cover; object-position: top; }
figcaption { padding: 13px 15px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }

.cta-band { padding: 66px 0; color: #fff; background: var(--ink); }
.cta-wrap { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 40px; }
.cta-wrap h2 { margin-bottom: 10px; font-size: clamp(28px, 4vw, 42px); }
.cta-wrap p { max-width: 700px; margin: 0; color: #bdc7d4; }
.cta-band .button { background: #fff; border-color: #fff; color: var(--ink); }
.cta-band .button:hover { background: #eef3f8; }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px 70px; }
.contact-details { margin: 26px 0 0; padding: 0; list-style: none; }
.contact-details li { padding: 15px 0; border-bottom: 1px solid var(--line); }
.contact-details strong { display: block; margin-bottom: 3px; font-size: 13px; color: var(--muted); }
.contact-details a { color: var(--blue); text-decoration: none; }
.form-panel { padding: 28px; border: 1px solid var(--line); border-radius: 7px; background: var(--soft); }
.form-panel h3 { margin-bottom: 7px; }
.form-panel > p { margin: 0 0 20px; color: var(--muted); font-size: 14px; }
.field { margin-bottom: 14px; }
.field label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 650; }
.field input, .field textarea, .field select { width: 100%; padding: 11px 12px; border: 1px solid #c9d2dc; border-radius: 5px; background: #fff; color: var(--ink); }
.field textarea { min-height: 90px; resize: vertical; }
.form-note { margin: 13px 0 0; color: var(--muted); font-size: 12px; }

.site-footer { padding: 48px 0 24px; color: #bec7d4; background: #111925; }
.footer-grid { display: grid; grid-template-columns: 1.4fr .6fr .6fr; gap: 55px; }
.footer-brand { color: #fff; margin-bottom: 14px; }
.site-footer p { max-width: 520px; font-size: 13px; }
.site-footer h3 { color: #fff; font-size: 14px; }
.footer-links { display: grid; gap: 9px; }
.footer-links a { color: #bec7d4; text-decoration: none; font-size: 13px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { margin-top: 38px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.1); font-size: 12px; }

.legal-hero { padding: 70px 0 44px; background: var(--soft); border-bottom: 1px solid var(--line); }
.legal-hero h1 { margin-bottom: 10px; font-size: 42px; }
.legal-hero p { color: var(--muted); margin: 0; }
.legal-content { width: min(calc(100% - 40px), 850px); margin: 0 auto; padding: 60px 0 90px; }
.legal-content h2 { margin: 38px 0 12px; font-size: 23px; }
.legal-content h3 { margin: 25px 0 8px; font-size: 17px; }
.legal-content p, .legal-content li { color: #4f5c6d; }
.legal-content a { color: var(--blue); }
.legal-content .summary { padding: 22px; border-left: 4px solid var(--blue); background: #f1f6fd; }

@media (max-width: 980px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .hero-grid, .split, .permissions, .contact-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 50px; }
  .hero-grid { gap: 44px; }
  .cap-grid { grid-template-columns: 1fr 1fr; }
  .permissions { gap: 36px; }
  .gallery { grid-template-columns: 1fr; }
  .gallery-side { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  .nav { min-height: 64px; }
  .brand { font-size: 14px; }
  .brand-mark { width: 31px; height: 31px; }
  .nav-cta { padding: 7px 10px; font-size: 13px; }
  .hero { padding: 42px 0 44px; }
  h1 { font-size: 38px; }
  .hero-copy { font-size: 16px; }
  .hero-actions .button { width: 100%; }
  .frame-label { left: 18px; bottom: -14px; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .metric { padding: 13px 16px; border-bottom: 1px solid rgba(255,255,255,.12); }
  .metric:nth-child(odd) { border-left: 0; padding-left: 0; }
  .section { padding: 66px 0; }
  .cap-grid { grid-template-columns: 1fr; }
  .cap-card { min-height: 0; }
  .cap-number { margin-bottom: 22px; }
  .permission-row { grid-template-columns: 1fr; }
  .permission-row .label { padding-bottom: 7px; }
  .permission-row p { padding-top: 0; }
  .gallery-side { grid-template-columns: 1fr; }
  .cta-wrap { grid-template-columns: 1fr; }
  .cta-wrap .button { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .legal-hero h1 { font-size: 34px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}