* {
  box-sizing: border-box;
}

:root {
  --primary: rgb(70,139,223);
  --primary-deep: #1f5ea8;
  --primary-soft: #eaf4ff;
  --ink: #12223a;
  --muted: #617088;
  --line: #dbe9f8;
  --card: rgba(255,255,255,.86);
  --bg: #f6fbff;
  --shadow: 0 18px 50px rgba(42, 96, 156, .12);
  --radius: 22px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.7;
  background:
    radial-gradient(circle at 8% 4%, rgba(70,139,223,.16), transparent 28%),
    radial-gradient(circle at 86% 14%, rgba(70,139,223,.12), transparent 32%),
    linear-gradient(180deg, #f6fbff 0%, #ffffff 46%, #f4f9ff 100%);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(219,233,248,.86);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: .02em;
}

.logo img,
.footer-brand img {
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(70,139,223,.18);
}

.nav-toggle {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--primary-deep);
  font-size: 22px;
}

.site-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  display: none;
  padding: 12px;
  background: rgba(255,255,255,.98);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.site-nav.open {
  display: grid;
  gap: 4px;
}

.site-nav a {
  padding: 11px 14px;
  border-radius: 12px;
  color: #53657c;
  font-size: 15px;
  font-weight: 600;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--primary-deep);
  background: var(--primary-soft);
}

.hero {
  padding: 42px 0 26px;
}

.hero-layout {
  display: grid;
  gap: 28px;
  align-items: center;
}

.eyebrow,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--primary-deep);
  background: rgba(70,139,223,.1);
  border: 1px solid rgba(70,139,223,.16);
  font-size: 13px;
  font-weight: 700;
}

h1,
h2,
h3 {
  line-height: 1.24;
  margin: 0 0 14px;
  color: var(--ink);
}

h1 {
  font-size: clamp(32px, 8vw, 58px);
  letter-spacing: -.05em;
}

h2 {
  font-size: clamp(25px, 5vw, 38px);
  letter-spacing: -.035em;
}

h3 {
  font-size: 19px;
}

p {
  margin: 0 0 14px;
  color: var(--muted);
}

.lead {
  font-size: clamp(17px, 3vw, 20px);
  color: #40536b;
}

.hero-tags,
.inline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 24px;
}

.hero-tags span,
.inline-tags span,
.mini-tag {
  padding: 8px 11px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.78);
  border-radius: 999px;
  font-size: 13px;
  color: #486079;
  font-weight: 650;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 22px;
  border-radius: 14px;
  border: none;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #2f73c9);
  box-shadow: 0 14px 28px rgba(70,139,223,.26);
  font-weight: 800;
  letter-spacing: .02em;
  transition: transform .18s ease, box-shadow .18s ease;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(70,139,223,.32);
}

.hero-visual {
  position: relative;
  min-height: 460px;
  border-radius: 28px;
  padding: 22px;
  background:
    linear-gradient(140deg, rgba(255,255,255,.82), rgba(235,246,255,.84)),
    radial-gradient(circle at 80% 10%, rgba(70,139,223,.24), transparent 38%);
  border: 1px solid rgba(255,255,255,.78);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-visual::before {
  content: "";
  position: absolute;
  width: 240px;
  height: 240px;
  right: -70px;
  top: -50px;
  border-radius: 50%;
  background: rgba(70,139,223,.16);
}

.phone-card {
  position: relative;
  z-index: 1;
  max-width: 310px;
  margin: 8px auto 0;
  border-radius: 32px;
  background: #fff;
  padding: 12px;
  box-shadow: 0 26px 70px rgba(31,94,168,.18);
}

.status-card,
.float-card,
.info-panel,
.glass-card,
.notice-card {
  background: rgba(255,255,255,.9);
  border: 1px solid rgba(219,233,248,.92);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.status-card {
  position: absolute;
  left: 18px;
  bottom: 22px;
  z-index: 2;
  width: min(255px, calc(100% - 36px));
  padding: 16px;
}

.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid #edf4fb;
  color: #4c5e76;
  font-size: 14px;
}

.status-row:last-child {
  border-bottom: 0;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 5px rgba(70,139,223,.12);
}

.float-card {
  position: absolute;
  right: 18px;
  top: 24px;
  z-index: 2;
  padding: 13px 15px;
  font-size: 13px;
  color: var(--primary-deep);
  font-weight: 800;
}

.section {
  padding: 42px 0;
}

.section-title {
  max-width: 760px;
  margin-bottom: 24px;
}

.trust-grid,
.category-grid,
.feature-grid,
.scenario-grid,
.recommend-grid,
.article-grid,
.faq-grid {
  display: grid;
  gap: 16px;
}

.trust-grid {
  grid-template-columns: repeat(2, 1fr);
}

.trust-item,
.category-card,
.feature-card,
.scenario-card,
.article-card,
.faq-item,
.step-card,
.security-card,
.tip-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: 0 12px 36px rgba(42,96,156,.08);
}

.trust-item {
  padding: 18px;
  min-height: 120px;
}

.trust-item strong {
  display: block;
  font-size: 18px;
  margin-bottom: 6px;
}

.category-card,
.feature-card,
.scenario-card,
.article-card,
.faq-item,
.step-card,
.security-card,
.tip-card {
  padding: 22px;
}

.category-card {
  position: relative;
  overflow: hidden;
}

.category-card::after {
  content: "→";
  position: absolute;
  right: 20px;
  top: 18px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--primary-deep);
  background: var(--primary-soft);
}

.category-card:hover {
  border-color: rgba(70,139,223,.45);
  transform: translateY(-2px);
  transition: .18s ease;
}

.card-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  border-radius: 15px;
  color: var(--primary-deep);
  background: linear-gradient(135deg, #eef7ff, #ffffff);
  font-weight: 900;
}

.split-layout,
.security-layout,
.page-layout {
  display: grid;
  gap: 22px;
  align-items: start;
}

.info-panel {
  padding: 24px;
}

.security-panel {
  padding: 24px;
  background:
    linear-gradient(145deg, rgba(255,255,255,.94), rgba(235,247,255,.9)),
    radial-gradient(circle at 100% 0%, rgba(70,139,223,.15), transparent 38%);
}

.security-list,
.clean-list,
.check-list {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 18px 0 0;
  list-style: none;
}

.security-list li,
.clean-list li,
.check-list li {
  position: relative;
  padding: 12px 12px 12px 38px;
  border-radius: 14px;
  background: rgba(245,250,255,.86);
  color: #4a5e75;
}

.security-list li::before,
.clean-list li::before,
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 13px;
  color: var(--primary-deep);
  font-weight: 900;
}

.steps {
  display: grid;
  gap: 16px;
  counter-reset: step;
}

.step-card {
  counter-increment: step;
}

.step-card::before {
  content: counter(step);
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  color: #fff;
  border-radius: 14px;
  background: var(--primary);
  font-weight: 900;
}

.cta-section {
  margin: 26px 0 56px;
  padding: 34px 22px;
  text-align: center;
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.96)),
    radial-gradient(circle at 15% 15%, rgba(70,139,223,.18), transparent 36%);
  border: 1px solid rgba(70,139,223,.18);
  box-shadow: var(--shadow);
}

.page-hero {
  padding: 46px 0 24px;
}

.page-hero .container {
  display: grid;
  gap: 20px;
}

.page-card {
  padding: 28px;
  border-radius: 28px;
  background: rgba(255,255,255,.86);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.download-panel {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.notice-card {
  padding: 18px;
  border-left: 5px solid var(--primary);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item h3 {
  margin-bottom: 8px;
}

.site-footer {
  padding: 40px 0 24px;
  background: #eef7ff;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  gap: 24px;
}

.site-footer h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.site-footer a {
  display: block;
  color: #51647c;
  padding: 4px 0;
}

.site-footer a:hover {
  color: var(--primary-deep);
}

.copyright {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid #d5e6f8;
  color: #63748a;
  font-size: 13px;
}

.kpi-box {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid var(--line);
}

.kpi-box strong {
  font-size: 24px;
  color: var(--primary-deep);
}

@media (min-width: 640px) {
  .category-grid,
  .feature-grid,
  .scenario-grid,
  .recommend-grid,
  .article-grid,
  .faq-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .trust-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-hero .container {
    grid-template-columns: 1.35fr .65fr;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
  }

  .site-nav a {
    font-size: 14px;
  }

  .hero {
    padding: 72px 0 42px;
  }

  .hero-layout {
    grid-template-columns: minmax(0, 1.02fr) minmax(420px, .98fr);
  }

  .category-grid,
  .feature-grid,
  .scenario-grid,
  .recommend-grid,
  .article-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .split-layout,
  .security-layout,
  .page-layout {
    grid-template-columns: 1fr 1fr;
  }

  .steps {
    grid-template-columns: repeat(4, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1.4fr repeat(3, 1fr);
  }

  .copyright {
    flex-direction: row;
    justify-content: space-between;
  }

  .section {
    padding: 58px 0;
  }

  .page-hero {
    padding: 68px 0 34px;
  }
}

@media (max-width: 420px) {
  .container {
    width: min(100% - 24px, 1120px);
  }

  .trust-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 410px;
    padding: 14px;
  }

  .status-card {
    bottom: 14px;
  }

  .float-card {
    right: 12px;
    top: 14px;
  }

  .download-btn {
    width: 100%;
  }
}