:root {
  --bg: #f5f7ff;
  --white: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --line: rgba(15, 23, 42, 0.08);
  --primary: #1d4ed8;
  --primary-deep: #1538a2;
  --primary-soft: rgba(29, 78, 216, 0.08);
  --success: #14b8a6;
  --accent: #8b5cf6;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

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

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

.container {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
}

.section {
  padding: 96px 0;
}

.section-light {
  background: rgba(255, 255, 255, 0.7);
}

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(29, 78, 216, 0.08);
  padding: 8px 12px;
  border-radius: 999px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.4rem);
  line-height: 1.1;
  letter-spacing: -0.06em;
  margin: 20px 0 18px;
}

h2 {
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.18;
  letter-spacing: -0.05em;
  margin: 16px 0 24px;
}

h3 {
  font-size: 1.38rem;
  line-height: 1.3;
  margin-bottom: 12px;
}

p {
  color: var(--muted);
  font-size: 1.05rem;
}

.lead {
  max-width: 620px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  backdrop-filter: blur(14px);
  background: rgba(245, 247, 255, 0.84);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 82px;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  box-shadow: var(--shadow);
}

.brand-text {
  font-size: 1.15rem;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.96rem;
  color: var(--muted);
}

.main-nav a {
  position: relative;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.2s ease;
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after {
  transform: scaleX(1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 14px 24px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  border: 1px solid transparent;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  box-shadow: 0 16px 35px rgba(29, 78, 216, 0.2);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.7);
  border-color: var(--line);
  color: var(--text);
}

.menu-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.7);
  padding: 10px 12px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: var(--text);
  margin: 5px 0;
}

.hero {
  padding-top: 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 42px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 30px 0 32px;
}

.hero-meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.hero-meta li {
  min-width: 140px;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.04);
}

.hero-meta strong {
  display: block;
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.hero-meta span {
  color: var(--muted);
  font-size: 0.86rem;
}

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

.panel-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(231,239,255,0.92));
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.panel-card-large {
  padding: 30px 28px;
}

.small-label {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 18px;
}

.score-ring {
  width: 200px;
  height: 200px;
  margin: 10px auto 24px;
  border-radius: 50%;
  background: conic-gradient(var(--primary) 0 91%, rgba(29,78,216,0.12) 91% 100%);
  display: grid;
  place-items: center;
}

.score-ring div {
  width: 138px;
  height: 138px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--white);
  text-align: center;
}

.score-ring strong {
  display: block;
  font-size: 3rem;
  line-height: 1;
}

.score-ring span {
  font-size: 0.9rem;
  color: var(--muted);
}

.chart-bars {
  display: flex;
  align-items: end;
  justify-content: center;
  gap: 12px;
  height: 108px;
}

.chart-bars span {
  display: block;
  width: 38px;
  border-radius: 12px 12px 0 0;
  background: linear-gradient(180deg, #60a5fa, #1d4ed8);
}

.panel-card-mini {
  padding: 24px 26px;
  display: grid;
  gap: 6px;
}

.panel-card-mini span,
.panel-card-mini small {
  color: var(--muted);
}

.panel-card-mini strong {
  font-size: 2rem;
  letter-spacing: -0.04em;
}

.trust-bar {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.4);
}

.trust-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 80px;
}

.trust-inner > span {
  color: var(--muted);
  font-weight: 600;
}

.trust-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

.trust-tags span {
  display: inline-flex;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,0.6);
  color: var(--muted);
}

.section-head {
  max-width: 720px;
  margin-bottom: 40px;
}

.left-align {
  margin-bottom: 28px;
}

.card-grid {
  display: grid;
  gap: 22px;
}

.three-col {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.info-card,
.case-card,
.stat-item,
.faq-list details {
  background: rgba(255,255,255,0.96);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.04);
}

.info-card {
  padding: 28px 24px;
}

.icon-wrap {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(29,78,216,0.12), rgba(139,92,246,0.12));
  color: var(--primary-deep);
  font-weight: 700;
  margin-bottom: 24px;
}

.two-col {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 42px;
  align-items: center;
}

.check-list {
  list-style: none;
  padding: 0;
  margin: 30px 0 0;
  display: grid;
  gap: 14px;
}

.check-list li {
  position: relative;
  padding-left: 30px;
  color: var(--text);
  font-weight: 500;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(20, 184, 166, 0.14);
  color: #0f766e;
  font-weight: 800;
}

.stats-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.stat-item {
  padding: 28px 22px;
}

.stat-item span {
  display: block;
  margin-bottom: 18px;
  color: var(--muted);
}

.stat-item strong {
  font-size: clamp(1.8rem, 2vw, 2.6rem);
  letter-spacing: -0.05em;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.case-card {
  padding: 26px 24px;
}

.case-tag {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(29, 78, 216, 0.08);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.case-metric {
  margin-top: 24px;
  color: var(--text);
  font-weight: 600;
}

.case-metric strong {
  color: var(--primary-deep);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.timeline-item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 26px 24px;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.04);
}

.step {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  font-weight: 700;
  color: var(--primary-deep);
  background: rgba(29,78,216,0.08);
}

.faq-wrap {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 30px;
  align-items: start;
}

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

.faq-list details {
  padding: 18px 20px;
}

.faq-list summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list p {
  margin: 16px 0 0;
}

.cta-section {
  padding-top: 20px;
}

.cta-box {
  background: linear-gradient(135deg, #0f172a, #1d4ed8 50%, #7c3aed);
  color: var(--white);
  border-radius: 32px;
  padding: 38px 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  box-shadow: var(--shadow);
}

.cta-box .eyebrow {
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.9);
}

.cta-box h2 {
  margin-bottom: 0;
  max-width: 700px;
}

.site-footer {
  padding: 28px 0 14px;
  border-top: 1px solid var(--line);
  background: rgba(255,255,255,0.5);
}

.footer-wrap,
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-wrap {
  padding-bottom: 18px;
}

.footer-brand {
  margin-bottom: 12px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--muted);
}

.footer-bottom {
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 960px) {
  .hero-grid,
  .two-col,
  .faq-wrap,
  .three-col,
  .case-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .main-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: calc(100% + 8px);
    display: none;
    flex-direction: column;
    align-items: flex-start;
    background: rgba(255,255,255,0.96);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 18px 20px;
    box-shadow: var(--shadow);
  }

  .main-nav.open {
    display: flex;
  }

  .nav-cta {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .cta-box,
  .footer-wrap,
  .footer-bottom,
  .trust-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 72px 0;
  }

  .hero {
    padding-top: 44px;
  }

  .hero-meta {
    display: grid;
    grid-template-columns: 1fr;
  }

  .score-ring {
    width: 170px;
    height: 170px;
  }

  .score-ring div {
    width: 116px;
    height: 116px;
  }

  .cta-box {
    padding: 28px 22px;
  }
}