:root {
  --primary: rgb(70,139,223);
  --primary-dark: #235fba;
  --primary-soft: #eaf4ff;
  --ink: #102033;
  --muted: #5f6f83;
  --line: #dbe8f7;
  --bg: #f6f9fe;
  --white: #ffffff;
  --shadow: 0 18px 45px rgba(45, 88, 138, .12);
  --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f7fbff 0%, #ffffff 42%, #f6f9fe 100%);
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(100% - 32px, 1160px); margin: 0 auto; }
.narrow { max-width: 860px; }
.center-text { text-align: center; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(219,232,247,.8);
}
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.logo, .footer-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; }
.logo img, .footer-logo img { width: 38px; height: 38px; border-radius: 12px; }
.nav-toggle { border: 1px solid var(--line); background: var(--white); color: var(--ink); width: 42px; height: 42px; border-radius: 14px; font-size: 20px; }
.site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 76px; padding: 12px; background: var(--white); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.site-nav.is-open { display: grid; gap: 6px; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: #20344d; font-weight: 600; }
.site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.hero { padding: 56px 0 38px; }
.gradient-bg { background: radial-gradient(circle at 20% 10%, rgba(70,139,223,.18), transparent 30%), linear-gradient(135deg, #f0f7ff 0%, #ffffff 55%, #eef6ff 100%); }
.hero-layout { display: grid; gap: 36px; align-items: center; }
.eyebrow, .section-kicker, .badge { display: inline-flex; align-items: center; gap: 8px; color: var(--primary-dark); background: rgba(70,139,223,.1); border: 1px solid rgba(70,139,223,.18); border-radius: 999px; padding: 7px 12px; font-size: 13px; font-weight: 700; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(34px, 8vw, 64px); line-height: 1.08; letter-spacing: -.045em; margin: 18px 0; }
h2 { font-size: clamp(24px, 5vw, 38px); line-height: 1.22; letter-spacing: -.03em; margin-bottom: 14px; }
h3 { font-size: 18px; line-height: 1.35; margin-bottom: 8px; }
.lead { font-size: 17px; color: #405369; max-width: 720px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 26px; }
.hero-tags span, .floating-tags span { border-radius: 999px; background: rgba(255,255,255,.78); border: 1px solid var(--line); padding: 8px 12px; color: #2f4865; font-size: 13px; font-weight: 650; }
.download-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; min-width: 138px; padding: 12px 22px; border-radius: 999px; background: var(--primary); color: #fff; font-weight: 800; box-shadow: 0 14px 28px rgba(70,139,223,.28); transition: transform .2s ease, box-shadow .2s ease; }
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 34px rgba(70,139,223,.34); }
.hero-visual { position: relative; min-height: 520px; display: grid; place-items: center; }
.phone-card { width: min(330px, 80vw); padding: 18px; border-radius: 34px; background: rgba(255,255,255,.74); border: 1px solid rgba(255,255,255,.9); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.phone-card img { border-radius: 26px; }
.status-card { position: absolute; display: grid; gap: 3px; padding: 14px 16px; border-radius: 18px; background: rgba(255,255,255,.9); border: 1px solid var(--line); box-shadow: 0 16px 34px rgba(38, 80, 130, .12); }
.status-card strong { color: var(--primary-dark); }
.status-card span { color: var(--muted); font-size: 13px; }
.status-top { top: 18px; right: 0; }
.status-mid { bottom: 92px; left: 0; }
.floating-tags { position: absolute; bottom: 22px; right: 10px; display: flex; flex-wrap: wrap; gap: 8px; width: min(330px, 90%); }
.section { padding: 66px 0; }
.compact-section { padding: 30px 0; }
.soft-bg { background: linear-gradient(180deg, #f4f9ff 0%, #ffffff 100%); }
.section-head { max-width: 780px; margin-bottom: 28px; }
.section-head p, .narrow p, .prose-card p, .page-hero p { color: var(--muted); }
.security-strip { display: grid; grid-template-columns: 1fr; gap: 12px; padding: 14px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,255,255,.82); box-shadow: var(--shadow); }
.security-strip div { padding: 16px; border-radius: 18px; background: linear-gradient(180deg, #fff, #f3f8ff); }
.security-strip b { display: block; color: var(--primary-dark); margin-bottom: 6px; }
.security-strip span { color: var(--muted); font-size: 14px; }
.steps-grid, .category-grid, .feature-grid, .scenario-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.step-card, .category-card, .feature-card, .scenario-card, .prose-card, .notice-card, .guide-panel, .security-panel, .side-panel, .cta-box, .faq-item { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: 0 12px 28px rgba(57, 95, 135, .08); }
.step-card em { display: inline-grid; place-items: center; width: 36px; height: 36px; margin-bottom: 14px; border-radius: 12px; background: var(--primary); color: #fff; font-style: normal; font-weight: 800; }
.step-card p, .category-card p, .feature-card p, .scenario-card p { color: var(--muted); margin-bottom: 0; }
.category-card span { color: var(--primary-dark); font-weight: 800; font-size: 13px; }
.category-card:hover, .step-card:hover { border-color: rgba(70,139,223,.45); transform: translateY(-2px); transition: .2s ease; }
.security-layout, .two-col, .content-layout, .guide-layout { display: grid; gap: 24px; align-items: start; }
.security-panel { display: grid; gap: 12px; background: linear-gradient(160deg, #ffffff, #eef6ff); }
.security-panel div { padding: 16px; border-radius: 16px; background: rgba(255,255,255,.78); border: 1px solid rgba(219,232,247,.8); }
.security-panel b { display: block; color: var(--primary-dark); }
.security-panel span { color: var(--muted); font-size: 14px; }
.link-list { display: grid; gap: 12px; }
.link-list a { padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: #fff; font-weight: 750; color: var(--primary-dark); }
.faq-summary { display: grid; gap: 12px; }
.cta-section { padding-top: 38px; }
.cta-box { text-align: center; background: linear-gradient(135deg, #eef7ff, #ffffff); }
.page-hero { padding: 52px 0 34px; background: radial-gradient(circle at 82% 10%, rgba(70,139,223,.16), transparent 30%), linear-gradient(135deg, #f2f8ff, #ffffff); }
.page-hero h1 { font-size: clamp(32px, 7vw, 52px); }
.page-hero .download-btn { margin-top: 12px; }
.clean-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.clean-list li { position: relative; padding: 12px 12px 12px 40px; border-radius: 14px; background: #f4f9ff; color: #30465f; }
.clean-list li::before { content: "✓"; position: absolute; left: 14px; top: 12px; color: var(--primary-dark); font-weight: 900; }
.ordered { counter-reset: item; }
.ordered li::before { content: counter(item); counter-increment: item; display: grid; place-items: center; top: 12px; width: 20px; height: 20px; border-radius: 7px; background: var(--primary); color: #fff; font-size: 12px; }
.mini-note { margin-top: 18px; padding: 14px; border-radius: 16px; background: #fff; border: 1px dashed rgba(70,139,223,.45); color: var(--muted); }
.faq-list { display: grid; gap: 16px; }
.site-footer { padding: 52px 0 24px; background: #f0f6fd; border-top: 1px solid var(--line); }
.footer-grid { display: grid; gap: 24px; }
.site-footer p { color: var(--muted); }
.site-footer h3 { margin-top: 0; }
.site-footer a { display: block; color: #405369; margin: 8px 0; }
.footer-bottom { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
@media (min-width: 640px) {
  .category-grid, .steps-grid, .feature-grid, .scenario-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .security-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}
@media (min-width: 920px) {
  .nav-toggle { display: none; }
  .site-nav { display: flex; position: static; padding: 0; border: 0; box-shadow: none; background: transparent; align-items: center; gap: 4px; }
  .hero { padding: 82px 0 60px; }
  .hero-layout { grid-template-columns: 1.05fr .95fr; gap: 60px; }
  .category-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .steps-grid, .feature-grid, .scenario-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .security-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .security-layout, .two-col, .content-layout, .guide-layout { grid-template-columns: 1.2fr .8fr; }
  .page-hero { padding: 74px 0 48px; }
}
@media (min-width: 1180px) {
  .hero-copy { padding-left: 8px; }
  .status-top { right: 20px; }
  .status-mid { left: 16px; }
}
@media (max-width: 430px) {
  .container { width: min(100% - 24px, 1160px); }
  .section { padding: 48px 0; }
  .hero-visual { min-height: 450px; }
  .status-card { position: static; margin-top: 10px; width: 100%; }
  .floating-tags { position: static; width: 100%; margin-top: 10px; }
  .phone-card { width: 78vw; }
  .download-btn { width: 100%; }
}