:root {
  --brand-red: #e7081b;
  --brand-red-dark: #c40616;
  --gold-top: #fff6e8;
  --gold-mid: #ffe9b5;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-muted: #999999;
  --surface: #ffffff;
  --surface-muted: #f7f7f8;
  --border: #ececec;
  --shadow: 0 12px 40px rgba(231, 8, 27, 0.08);
  --radius-lg: 20px;
  --radius-md: 14px;
  --max-width: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-primary);
  background: var(--surface);
  line-height: 1.6;
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(236, 236, 236, 0.9);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 18px;
}

.brand__logo {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  color: var(--text-secondary);
  font-size: 15px;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--brand-red);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 24px;
  border: 0;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

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

.btn--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--brand-red), #ff4d4f);
  box-shadow: 0 10px 24px rgba(231, 8, 27, 0.24);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--brand-red-dark), var(--brand-red));
}

.btn--ghost {
  color: var(--brand-red);
  background: #fff;
  border: 1px solid rgba(231, 8, 27, 0.18);
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at top right, rgba(255, 233, 181, 0.9), transparent 42%),
    linear-gradient(180deg, var(--gold-top) 0%, #fff 72%);
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 72px 0 88px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--brand-red);
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--shadow);
}

.hero__title {
  margin: 18px 0 12px;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero__title span {
  color: var(--brand-red);
}

.hero__subtitle {
  margin: 0 0 28px;
  max-width: 34em;
  color: var(--text-secondary);
  font-size: 18px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 22px;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--text-muted);
  font-size: 14px;
}

.hero__phone {
  position: relative;
  justify-self: center;
  width: min(100%, 320px);
  aspect-ratio: 9 / 18;
  border-radius: 34px;
  padding: 14px;
  background: linear-gradient(160deg, #2b2b2b, #111);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.18);
}

.hero__phone-screen {
  height: 100%;
  border-radius: 24px;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 246, 232, 0.96), rgba(255, 255, 255, 0.98)),
    radial-gradient(circle at 50% 0%, rgba(231, 8, 27, 0.12), transparent 55%);
  padding: 28px 18px;
}

.phone-card {
  border-radius: 18px;
  background: #fff;
  padding: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.phone-card + .phone-card {
  margin-top: 14px;
}

.phone-card__label {
  color: var(--text-muted);
  font-size: 12px;
}

.phone-card__value {
  margin-top: 6px;
  font-size: 24px;
  font-weight: 800;
  color: var(--brand-red);
}

.section {
  padding: 84px 0;
}

.section--muted {
  background: var(--surface-muted);
}

.section__head {
  max-width: 640px;
  margin: 0 auto 48px;
  text-align: center;
}

.section__eyebrow {
  color: var(--brand-red);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.section__title {
  margin: 10px 0 12px;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.15;
}

.section__desc {
  margin: 0;
  color: var(--text-secondary);
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.03);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(231, 8, 27, 0.08);
  color: var(--brand-red);
  font-size: 22px;
  font-weight: 800;
}

.feature-card h3 {
  margin: 16px 0 8px;
  font-size: 20px;
}

.feature-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 15px;
}

.download-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: stretch;
}

.download-card,
.qr-card {
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 28px;
  box-shadow: var(--shadow);
}

.download-card h3,
.qr-card h3 {
  margin: 0 0 12px;
  font-size: 24px;
}

.download-card p,
.qr-card p {
  margin: 0 0 18px;
  color: var(--text-secondary);
}

.download-list {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.download-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 15px;
}

.download-list span:last-child {
  color: var(--text-secondary);
  text-align: right;
}

.qr-placeholder {
  display: grid;
  place-items: center;
  min-height: 220px;
  border-radius: var(--radius-md);
  border: 1px dashed #d9d9d9;
  background: repeating-linear-gradient(
    45deg,
    #fafafa,
    #fafafa 12px,
    #f3f3f3 12px,
    #f3f3f3 24px
  );
  color: var(--text-muted);
  text-align: center;
  padding: 20px;
}

.legal-page {
  padding: 48px 0 80px;
}

.legal-page__card {
  max-width: 820px;
  margin: 0 auto;
  padding: 36px 32px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.04);
}

.legal-page h1 {
  margin-top: 0;
  font-size: 32px;
}

.legal-page h2 {
  margin-top: 28px;
  font-size: 20px;
}

.legal-page p,
.legal-page li {
  color: var(--text-secondary);
  font-size: 15px;
}

.site-footer {
  padding: 36px 0 48px;
  background: #141414;
  color: rgba(255, 255, 255, 0.72);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.88);
}

.site-footer a:hover {
  color: #fff;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 14px;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 12px;
  background: var(--surface-muted);
  font-size: 20px;
}

@media (max-width: 960px) {
  .hero__inner,
  .download-panel {
    grid-template-columns: 1fr;
  }

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

  .hero__phone {
    width: min(100%, 280px);
  }
}

@media (max-width: 720px) {
  .menu-toggle {
    display: inline-grid;
    place-items: center;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border);
  }

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

  .site-nav .btn {
    width: 100%;
  }

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

  .hero__inner {
    padding-top: 48px;
  }
}