:root {
  --color-primary: #d4af37;
  --color-primary-dark: #b8960f;
  --color-primary-light: #f5f0e0;
  --color-secondary: #0a192f;
  --color-secondary-light: #1e3a5f;
  --color-text: #1a1a1a;
  --color-text-muted: #6b7280;
  --color-bg: #f8f9fa;
  --color-white: #ffffff;
  --font-base: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --max-width: 1120px;
  --radius: 12px;
  --shadow: 0 12px 40px rgba(10, 25, 47, 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(10, 25, 47, 0.92);
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-white);
  font-weight: 700;
  font-size: 1.125rem;
}

.brand__mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  display: grid;
  place-items: center;
  color: var(--color-secondary);
  font-weight: 800;
}

.site-nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

.site-nav a {
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.95rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-secondary);
  box-shadow: 0 8px 24px rgba(212, 175, 55, 0.35);
}

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.btn--dark {
  color: var(--color-secondary);
  background: transparent;
  border: 1px solid rgba(10, 25, 47, 0.18);
}

.hero {
  background:
    radial-gradient(circle at top right, rgba(212, 175, 55, 0.18), transparent 40%),
    linear-gradient(180deg, var(--color-secondary) 0%, #091222 100%);
  color: var(--color-white);
  padding: 96px 0 112px;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero__eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(212, 175, 55, 0.14);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.15;
}

.hero__lead {
  margin: 0 0 32px;
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.78);
  max-width: 560px;
}

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

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.hero__tags li {
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(212, 175, 55, 0.12);
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.875rem;
}

.hero__card h3 {
  margin: 0 0 12px;
}

.hero__card-lead {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
}

.hero__card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(212, 175, 55, 0.22);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.stat {
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius);
  padding: 16px;
}

.stat strong {
  display: block;
  font-size: 1.5rem;
  color: var(--color-primary);
}

.stat span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.875rem;
}

.section {
  padding: 88px 0;
}

.section--light {
  background: var(--color-white);
}

.section__head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section__head h2 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  color: var(--color-secondary);
}

.section__head p {
  margin: 0;
  color: var(--color-text-muted);
}

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

.feature-card {
  background: var(--color-bg);
  border-radius: 20px;
  padding: 28px;
  border: 1px solid #eceff3;
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  margin: 0 0 10px;
  color: var(--color-secondary);
}

.feature-card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.step {
  text-align: center;
  padding: 24px 16px;
}

.step__num {
  width: 44px;
  height: 44px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--color-secondary);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  font-weight: 700;
}

.cta {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-light));
  color: var(--color-white);
  border-radius: 28px;
  padding: 56px 32px;
  text-align: center;
}

.cta h2 {
  margin: 0 0 12px;
  font-size: 2rem;
}

.cta p {
  margin: 0 0 28px;
  color: rgba(255, 255, 255, 0.78);
}

.cta__links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

.join-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-light));
  color: var(--color-white);
  border-radius: 28px;
  padding: 56px 40px;
}

.join-copy__eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(212, 175, 55, 0.16);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
}

.join-copy h2 {
  margin: 0 0 16px;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
}

.join-copy p {
  margin: 0 0 20px;
  color: rgba(255, 255, 255, 0.78);
}

.join-list {
  margin: 0 0 28px;
  padding-left: 18px;
  color: rgba(255, 255, 255, 0.88);
}

.join-list li + li {
  margin-top: 8px;
}

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

.qr-card {
  text-align: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(212, 175, 55, 0.24);
  border-radius: 24px;
  padding: 28px 24px;
}

.qr-card__frame {
  display: inline-flex;
  padding: 14px;
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}

.qr-card__image {
  display: block;
  width: 220px;
  height: 220px;
}

.qr-card__title {
  margin: 20px 0 6px;
  font-size: 1.125rem;
  font-weight: 700;
}

.qr-card__hint {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.875rem;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: #fff;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-header__cta {
  flex-shrink: 0;
}

.site-footer__brand {
  color: #fff;
}

.site-footer {
  background: #060f1d;
  color: rgba(255, 255, 255, 0.72);
  padding: 40px 0;
  font-size: 0.875rem;
}

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

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

@media (max-width: 900px) {
  .hero__grid,
  .features,
  .steps,
  .join-grid {
    grid-template-columns: 1fr;
  }

  .site-header__inner {
    flex-wrap: wrap;
    gap: 12px;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0 4px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
  }

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

  .site-header__cta {
    display: none;
  }

  .join-grid {
    padding: 36px 24px;
  }
}