:root {
  --blue: #3478F6;
  --blue-dark: #225ED4;
  --purple: #6366F1;
  --yellow: #F5A800;
  --bg: #F6F8FA;
  --surface: #FFFFFF;
  --text: #1F2329;
  --text-2: #646A73;
  --text-3: #8F959E;
  --paper: #FAF3DC;
  --border: rgba(0,0,0,0.08);
  --radius: 16px;
}
* { 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; }
img { max-width: 100%; display: block; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* 顶部导航 */
header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(246,248,250,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
nav.wrap { display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.nav-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.nav-actions a { white-space: nowrap; }
.brand { min-width: 0; }
@media (max-width: 480px) {
  nav.wrap { padding: 12px 14px; }
  .brand { font-size: 15px; gap: 8px; }
  .brand img { width: 28px; height: 28px; }
  .nav-cta { padding: 8px 12px; font-size: 13px; }
  .nav-login { padding: 7px 12px; font-size: 13px; }
}
.lang-switch { display: inline-flex; border: 1.5px solid var(--border); border-radius: 999px; overflow: hidden; background: #fff; }
.lang-switch a {
  font-size: 13px; font-weight: 600; padding: 6px 11px; color: #5b6470;
}
.lang-switch a.active { background: var(--blue); color: #fff; }
@media (max-width: 480px) { .lang-switch a { padding: 6px 8px; font-size: 12px; } }
.nav-login {
  padding: 8px 18px; border-radius: 999px; font-weight: 600; font-size: 14px;
  border: 1.5px solid var(--blue); color: var(--blue); background: transparent;
}
.nav-login:hover { background: rgba(52,120,246,0.08); }
.btn-web {
  display: inline-block; margin: 12px 0 0 12px; padding: 14px 26px; border-radius: 999px;
  border: 1.5px solid #3478F6; color: #3478F6; font-weight: 600; text-decoration: none;
}
.nav-cta {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  color: #fff; padding: 9px 20px; border-radius: 999px; font-weight: 600; font-size: 14px;
}

/* Hero */
.hero { padding: 64px 24px 40px; text-align: center; }
.hero .icon { width: 88px; height: 88px; border-radius: 22px; margin: 0 auto 24px; box-shadow: 0 12px 32px rgba(52,120,246,0.25); }
.hero h1 { font-size: 2.2em; margin: 0 0 16px; letter-spacing: -0.01em; }
.hero h1 .accent {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.sub { color: var(--text-2); font-size: 1.1em; max-width: 560px; margin: 0 auto 32px; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  color: #fff; padding: 15px 36px; border-radius: 999px; font-weight: 700; font-size: 16px;
  box-shadow: 0 10px 28px rgba(52,120,246,0.35);
}
.hero .meta { margin-top: 14px; color: var(--text-3); font-size: 13px; }

/* Features */
section { padding: 56px 24px; }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: 1.6em; margin: 0 0 8px; }
.section-title p { color: var(--text-2); margin: 0; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--surface); border-radius: var(--radius); padding: 26px;
  border: 1px solid var(--border);
}
.feature-card .emoji { font-size: 30px; margin-bottom: 14px; }
.feature-card h3 { margin: 0 0 8px; font-size: 1.05em; }
.feature-card p { margin: 0; color: var(--text-2); font-size: 14px; }

/* Screenshots */
.shots-strip {
  display: flex; gap: 16px; overflow-x: auto; padding: 4px 24px 16px;
  scroll-snap-type: x proximity; -webkit-overflow-scrolling: touch;
  justify-content: center; justify-content: safe center;
}
.shots-strip img {
  scroll-snap-align: start;
  height: 400px; width: auto; border-radius: 20px; border: 1px solid var(--border);
  box-shadow: 0 16px 40px rgba(0,0,0,0.08); flex: none;
}

/* Pricing */
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; max-width: 900px; margin: 0 auto; }
.price-card { background: var(--surface); border-radius: var(--radius); padding: 28px; border: 1px solid var(--border); text-align: center; }
.price-card.featured { border: 2px solid var(--blue); position: relative; }
.price-card .badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--blue); color: #fff; font-size: 12px; padding: 4px 14px; border-radius: 999px; font-weight: 600;
}
.price-card h3 { margin: 8px 0 4px; font-size: 1.1em; }
.price-card .price { font-size: 2em; font-weight: 800; margin: 8px 0 4px; }
.price-card .price span { font-size: 0.4em; font-weight: 500; color: var(--text-3); }
.price-card ul { text-align: left; padding-left: 1.2em; color: var(--text-2); font-size: 14px; margin: 16px 0 0; }
.price-note { text-align: center; color: var(--text-3); font-size: 13px; margin-top: 24px; }

/* Download */
.download-section {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  border-radius: 28px; margin: 0 24px; padding: 56px 24px; text-align: center; color: #fff;
}
.download-section h2 { margin: 0 0 12px; font-size: 1.7em; }
.download-section p { opacity: 0.9; margin: 0 0 28px; }
.btn-white {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; color: var(--blue-dark); padding: 15px 36px; border-radius: 999px; font-weight: 700; font-size: 16px;
}
.download-section .hint { margin-top: 16px; font-size: 13px; opacity: 0.85; }

footer { padding: 40px 24px 60px; text-align: center; color: var(--text-3); font-size: 13px; }
footer a { color: var(--text-2); text-decoration: underline; }
footer .links { margin-bottom: 10px; }
footer .links a { margin: 0 10px; }

@media (max-width: 760px) {
  .features { grid-template-columns: 1fr; }
  .pricing { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.7em; }
  .shots-strip img { height: 360px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418; --surface: #1E2128; --text: #F2F3F5; --text-2: #A4A9B2; --text-3: #6B7280;
    --border: rgba(255,255,255,0.1);
  }
}

/* Use cases / FAQ */
.usecases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.faq { max-width: 760px; margin: 0 auto; }
.faq details {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px 20px; margin-bottom: 12px;
}
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 10px 0 0; color: var(--text-2); font-size: 14px; }
@media (max-width: 760px) { .usecases { grid-template-columns: 1fr; } }