:root {
  --bg-top: #edf6ff;
  --bg-bottom: #f7fbff;
  --card: rgba(255, 255, 255, 0.88);
  --card-strong: #ffffff;
  --line: rgba(26, 64, 109, 0.12);
  --text: #101828;
  --muted: #667085;
  --blue: #0078d4;
  --blue-deep: #005fa3;
  --green: #0f9d58;
  --green-deep: #0b7d46;
  --shadow: 0 22px 70px rgba(31, 73, 125, 0.16);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family:
    "SF Pro Display",
    "SF Pro Text",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(0, 120, 212, 0.18), transparent 34%),
    radial-gradient(circle at right center, rgba(15, 157, 88, 0.14), transparent 28%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

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

a {
  color: inherit;
}

.page-shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: clamp(16px, 4vw, 40px) 0 28px;
}

.app-page {
  display: grid;
  gap: 28px;
}

.hero-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  gap: clamp(18px, 3vw, 28px);
  align-items: center;
  padding: clamp(20px, 3.5vw, 34px);
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.hero-copy {
  display: grid;
  gap: 18px;
}

.eyebrow {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--blue);
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(2.3rem, 5vw, 4.3rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 16px;
  border: 1px solid rgba(0, 120, 212, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: #1849a9;
  font-size: 0.94rem;
  font-weight: 600;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.download-btn {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 6px;
  min-height: 112px;
  padding: 20px 22px;
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: #ffffff;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    filter 180ms ease;
}

.download-btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.22), transparent 54%);
  pointer-events: none;
}

.download-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.16);
  filter: saturate(1.04);
}

.download-btn.android {
  background: linear-gradient(135deg, var(--green), var(--green-deep));
}

.download-btn.ios {
  background: linear-gradient(135deg, #111827, #374151);
}

.btn-title {
  position: relative;
  z-index: 1;
  font-size: 1.16rem;
  font-weight: 700;
}

.btn-subtitle {
  position: relative;
  z-index: 1;
  font-size: 0.94rem;
  color: rgba(255, 255, 255, 0.82);
}

.support-box {
  display: grid;
  gap: 8px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.62);
}

.support-title {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--muted);
}

.support-box a {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--blue-deep);
  text-decoration: none;
}

.support-box a:hover {
  text-decoration: underline;
}

.preview-panel {
  display: grid;
  gap: 16px;
  align-items: center;
}

.preview-frame {
  width: 100%;
  padding: 14px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(240, 247, 255, 0.94));
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 30px;
  box-shadow: 0 24px 60px rgba(24, 73, 169, 0.15);
}

.preview-frame img {
  width: 100%;
  border-radius: 20px;
}

.feature-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.feature-card {
  padding: 24px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 22px;
  box-shadow: 0 12px 36px rgba(31, 73, 125, 0.08);
}

.feature-label {
  margin: 0 0 12px;
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--blue);
}

.feature-card h2 {
  margin: 0 0 8px;
  font-size: 1.18rem;
}

.feature-card p:last-child {
  margin: 0;
  color: var(--muted);
  line-height: 1.72;
}

.site-footer {
  padding: 22px 0 8px;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 960px) {
  .hero-card {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    order: -1;
  }

  .hero-copy h1 {
    max-width: 100%;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100vw - 16px, 100%);
    padding-top: 18px;
  }

  .hero-card {
    padding: 18px;
    border-radius: 24px;
  }

  .hero-copy h1 {
    font-size: clamp(1.8rem, 9vw, 2.2rem);
  }

  .download-btn {
    min-height: 98px;
    padding: 18px;
  }
}