:root {
  color-scheme: light;
  --primary: #ff6b35;
  --green: #58cc02;
  --green-dark: #46a302;
  --text: #1f2937;
  --muted: #6b7280;
  --bg: #f7f8f5;
  --card: #ffffff;
  --border: #e8ebe3;
  --hero: linear-gradient(135deg, #eef9e4 0%, #fff8f3 55%, #ffffff 100%);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

.container {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
}

.brand-icon {
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(88, 204, 2, 0.25);
}

.brand-text span {
  color: var(--green);
}

.nav-toggle {
  display: none;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
}

.nav {
  display: flex;
  gap: 8px;
  margin-left: auto;
  font-size: 14px;
}

.nav a {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid #d7ddd2;
  background: #fff;
  color: var(--text);
  font-weight: 700;
  line-height: 1.2;
  box-shadow: 0 1px 0 rgba(31, 41, 55, 0.04);
}

.nav a:hover {
  color: var(--primary);
  border-color: #ffc7b0;
  background: #fff6f1;
}

.header-cta {
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 800;
  border: 0;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

.btn-sm {
  padding: 10px 16px;
  font-size: 14px;
  background: var(--green);
  color: #fff;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(255, 107, 53, 0.28);
}

.btn-ghost {
  background: #fff;
  color: var(--text);
  border: 2px solid var(--border);
}

.hero {
  background: var(--hero);
  padding: 56px 0 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #fff;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  border: 1px solid #ffe2d6;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0;
  max-width: 540px;
  color: var(--muted);
  font-size: 17px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
}

.download-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: min(100%, 440px);
}

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

.meta {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.phone-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 28px 24px;
  text-align: center;
  box-shadow: 0 20px 50px rgba(31, 41, 55, 0.08);
}

.hero-app-icon {
  width: min(220px, 70vw);
  height: auto;
  border-radius: 28px;
}

.phone-caption {
  margin: 16px 0 8px;
  font-size: 20px;
  font-weight: 800;
}

.phone-points {
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
}

.section {
  padding: 64px 0;
}

.section-alt {
  background: #fff;
}

.section-title {
  margin: 0;
  text-align: center;
  font-size: 30px;
}

.section-sub {
  margin: 10px 0 32px;
  text-align: center;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  box-shadow: 0 6px 18px rgba(31, 41, 55, 0.04);
}

.feature-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #eef9e4;
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 800;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  counter-reset: step;
}

.steps li {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 14px;
  text-align: center;
  position: relative;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: 10px;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
}

.steps strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
}

.steps span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.download-section {
  padding-bottom: 80px;
}

.download-card {
  text-align: center;
  background: linear-gradient(180deg, #fff 0%, #f9fff4 100%);
  border: 1px solid #dff3c8;
  border-radius: 24px;
  padding: 36px 24px;
  box-shadow: 0 12px 30px rgba(88, 204, 2, 0.08);
}

.download-card h2 {
  margin: 0 0 8px;
  font-size: 28px;
}

.download-card p {
  margin: 0 auto;
  max-width: 520px;
  color: var(--muted);
}

.pledge-guide {
  text-align: left;
}

.pledge-guide h2,
.pledge-guide .guide-lead,
.pledge-guide .guide-cta {
  text-align: center;
}

.pledge-guide .guide-lead {
  max-width: 640px;
  line-height: 1.7;
}

.pledge-guide-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.pledge-guide-list li {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 18px;
}

.pledge-guide-list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
}

.pledge-guide .guide-note {
  margin-top: 16px;
  max-width: none;
  font-size: 13px;
  line-height: 1.75;
}

.pledge-guide .guide-cta {
  margin-top: 22px;
}

.site-footer {
  background: #1f2937;
  color: #d1d5db;
  padding: 36px 0 44px;
  font-size: 14px;
}

.footer-inner {
  text-align: center;
}

.footer-inner p {
  margin: 6px 0;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.footer-links a,
.footer-icp a {
  color: #e5e7eb;
}

.footer-icp {
  margin-top: 16px;
  font-size: 13px;
  color: #9ca3af;
}

.footer-gongan {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 10px;
  vertical-align: middle;
}

.footer-gongan img {
  display: block;
  width: 16px;
  height: 17px;
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }

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

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

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .header-cta {
    display: none;
  }

  .nav {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 8px;
    margin-left: 0;
    padding: 10px 20px 16px;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 24px rgba(31, 41, 55, 0.08);
  }

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

  .nav a {
    padding: 10px 14px;
    border-bottom: 0;
  }

  .site-header .container {
    position: relative;
  }

  .header-inner {
    flex-wrap: wrap;
  }
}

@media (max-width: 560px) {
  .feature-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 32px;
  }
}