:root {
  --blue: #2f6df6;
  --blue-dark: #1757e8;
  --blue-pale: #eef4ff;
  --ink: #101319;
  --text: #4f5664;
  --muted: #7c8493;
  --line: #e7ebf2;
  --surface-alt: #f7f9fc;
  --max-width: 1120px;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; color: var(--ink); background: #fff; font-family: var(--font-sans); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.site-header { position: sticky; z-index: 20; top: 0; border-bottom: 1px solid rgba(231,235,242,.9); background: rgba(255,255,255,.94); backdrop-filter: blur(16px); }
.nav-shell, .shell, .footer-shell { width: min(calc(100% - 48px), var(--max-width)); margin: 0 auto; }
.nav-shell { display: flex; min-height: 72px; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 800; }
.brand img { width: 36px; height: 36px; filter: invert(1); }
.nav-links { display: flex; align-items: center; gap: 28px; color: #303642; font-size: 14px; }
.nav-links a:hover { color: var(--blue); }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 999px; padding: 0 26px; font-weight: 700; }
.button-primary { color: #fff; background: var(--blue); box-shadow: 0 14px 30px rgba(47,109,246,.2); }
.button-secondary { border-color: #d9deea; background: #fff; }

.breadcrumbs { padding: 24px 0 0; color: var(--muted); font-size: 13px; }
.breadcrumbs a:hover { color: var(--blue); }
.landing-hero { overflow: hidden; padding: 58px 0 88px; background: linear-gradient(180deg, #fff 0%, #f6f9ff 100%); }
.hero-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(460px, 1.1fr); gap: 72px; align-items: center; }
.eyebrow { margin: 0 0 16px; color: var(--blue); font-size: 13px; font-weight: 750; letter-spacing: .12em; }
h1 { margin: 0; font-size: clamp(42px, 5vw, 66px); letter-spacing: -.055em; line-height: 1.12; }
.hero-lead { margin: 24px 0 0; color: var(--text); font-size: 19px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-points { display: grid; gap: 10px; margin: 30px 0 0; padding: 0; color: #303744; list-style: none; }
.hero-points li::before { margin-right: 10px; color: var(--blue); content: "✓"; font-weight: 800; }
.hero-media { overflow: hidden; border-radius: 28px; background: var(--blue-pale); box-shadow: 0 28px 70px rgba(34,79,160,.14); }
.hero-media img { width: 100%; height: auto; aspect-ratio: 1.48 / 1; object-fit: cover; }

.section { padding: 96px 0; }
.section-alt { background: var(--surface-alt); }
.section-heading { max-width: 740px; margin-bottom: 48px; }
.section-heading h2 { margin: 0; font-size: clamp(34px, 4vw, 50px); letter-spacing: -.045em; line-height: 1.2; }
.section-heading p:last-child { margin: 16px 0 0; color: var(--text); font-size: 17px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card { border: 1px solid var(--line); border-radius: 20px; padding: 30px; background: #fff; }
.feature-card span { color: var(--blue); font-size: 13px; font-weight: 800; }
.feature-card h3 { margin: 18px 0 10px; font-size: 23px; }
.feature-card p { margin: 0; color: var(--text); font-size: 15px; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 0; padding: 0; list-style: none; }
.steps li { border-top: 2px solid var(--blue); padding: 22px 8px 0 0; }
.steps strong { color: var(--blue); font-size: 13px; }
.steps h3 { margin: 14px 0 8px; font-size: 21px; }
.steps p { margin: 0; color: var(--text); font-size: 14px; }
.proof-panel { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: start; border-radius: 28px; padding: 56px; color: #fff; background: #10141d; }
.proof-panel h2 { margin: 0; font-size: clamp(34px, 4vw, 50px); line-height: 1.25; }
.proof-panel p { margin: 18px 0 0; color: #aeb8c9; }
.proof-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.proof-list li { border-top: 1px solid rgba(255,255,255,.14); padding: 22px 0; }
.proof-list li:last-child { border-bottom: 1px solid rgba(255,255,255,.14); }
.proof-list strong { display: block; margin-bottom: 4px; font-size: 19px; }
.proof-list span { color: #aeb8c9; font-size: 14px; }
.faq-list { display: grid; gap: 12px; max-width: 860px; }
.faq-list details { border: 1px solid var(--line); border-radius: 16px; padding: 0 22px; background: #fff; }
.faq-list summary { padding: 20px 0; cursor: pointer; font-weight: 700; }
.faq-list p { margin: -4px 0 22px; color: var(--text); }
.cta { padding: 76px 0; color: #fff; background: var(--blue); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.cta h2 { margin: 0; font-size: clamp(32px, 4vw, 48px); }
.cta p { margin: 10px 0 0; color: rgba(255,255,255,.78); }
.cta .button { color: var(--blue); background: #fff; }

.site-footer { padding: 52px 0 28px; color: #94a0b2; background: #0c1017; }
.footer-main { display: flex; align-items: flex-start; justify-content: space-between; gap: 36px; }
.footer-brand { color: #fff; font-size: 20px; font-weight: 800; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px 28px; font-size: 14px; }
.footer-links a:hover { color: #fff; }
.footer-legal { border-top: 1px solid rgba(255,255,255,.1); margin-top: 36px; padding-top: 22px; font-size: 12px; }

@media (max-width: 860px) {
  .nav-shell, .shell, .footer-shell { width: min(calc(100% - 36px), 720px); }
  .nav-links a:not(.button) { display: none; }
  .landing-hero { padding: 34px 0 64px; }
  .hero-grid { grid-template-columns: 1fr; gap: 38px; }
  h1 { font-size: clamp(38px, 11vw, 56px); }
  .feature-grid, .steps { grid-template-columns: 1fr 1fr; }
  .proof-panel { grid-template-columns: 1fr; gap: 36px; padding: 38px 28px; }
  .cta-inner, .footer-main { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 560px) {
  .section { padding: 72px 0; }
  .feature-grid, .steps { grid-template-columns: 1fr; }
  .hero-actions .button, .cta .button { width: 100%; }
  .nav-links { gap: 10px; }
  .nav-links .button { min-height: 42px; padding: 0 18px; font-size: 13px; }
}