:root {
  --bg: #f7f7f5;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #60646c;
  --line: #e6e7eb;
  --brand: #1f4f8f;
  --brand-soft: #eaf1fb;
  --dark: #132235;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

.narrow {
  width: min(780px, 100%);
}

.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(--line);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 16px 0;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 14px;
}

.site-logo {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 12px;
  background: #fff;
}

.brand {
  font-size: 22px;
  font-weight: 700;
}

.sub-brand {
  font-size: 13px;
  color: var(--muted);
}

.nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
}

.hero {
  padding: 72px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 28px;
  align-items: center;
}

.tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 13px;
  font-weight: 600;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.15;
}

h2 {
  margin: 0 0 20px;
  font-size: 30px;
}

h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 20px;
}

.hero-text,
.card p,
.section p,
li {
  color: var(--muted);
}

.section-intro {
  margin: -6px 0 20px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
  padding: 12px 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-secondary {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--line);
}

.hero-card,
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(17, 24, 39, 0.05);
}

.logo-card {
  text-align: center;
}

.hero-logo {
  width: min(100%, 280px);
  display: block;
  margin: 0 auto 18px;
  border-radius: 16px;
  background: #fff;
}

.section {
  padding: 72px 0;
}

.section-muted {
  background: #f0f4f8;
}

.section-dark {
  background: var(--dark);
  color: #fff;
}

.section-dark p,
.section-dark .contact-note {
  color: rgba(255, 255, 255, 0.82);
}

.grid {
  display: grid;
  gap: 20px;
}

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

.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.store-card p {
  margin: 6px 0;
}

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

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}