:root {
  --bg-dark: #0d0f17;
  --bg-panel: #161a26;
  --bg-card: #1e2334;
  --accent: #ffb703;
  --accent-glow: rgba(255, 183, 3, 0.4);
  --text-main: #f0f2f5;
  --text-sub: #9aa3b8;
  --border: rgba(255, 255, 255, 0.08);
  --gradient-gold: linear-gradient(135deg, #ffd166 0%, #ff9f1c 100%);
  --radius: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(13, 15, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo-wrap { display: flex; align-items: center; gap: 10px; }
.logo-wrap img { height: 32px; width: auto; object-fit: contain; }
.logo-text { font-size: 18px; font-weight: 700; letter-spacing: 1px; }
.nav-links { display: flex; gap: 24px; font-size: 14px; color: var(--text-sub); }
.nav-links a:hover { color: var(--accent); }
.mobile-menu-btn { display: none; background: none; border: none; color: #fff; font-size: 24px; cursor: pointer; }

/* Hero */
.hero {
  padding: 120px 20px 60px;
  text-align: center;
  position: relative;
  background: radial-gradient(circle at 50% 0%, rgba(255, 183, 3, 0.15) 0%, transparent 60%);
}
.hero-inner { max-width: 800px; margin: 0 auto; }
.hero h1 {
  font-size: 42px;
  line-height: 1.3;
  margin-bottom: 16px;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}
.hero-desc {
  font-size: 16px;
  color: var(--text-sub);
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero-tags { display: flex; justify-content: center; gap: 12px; margin-bottom: 32px; flex-wrap: wrap; }
.hero-tag {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  color: var(--accent);
}
.download-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--gradient-gold);
  color: #0d0f17;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px var(--accent-glow); }
.btn-outline {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}
.btn-outline:hover { background: rgba(255, 183, 3, 0.1); }
.btn-device {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--text-sub);
  background: var(--bg-panel);
  padding: 12px 20px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: all 0.2s;
}
.btn-device:hover { border-color: var(--accent); }
.btn-device strong { font-size: 15px; color: var(--text-main); }

/* Sections Common */
.section { padding: 80px 20px; max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 32px; margin-bottom: 12px; color: var(--text-main); }
.section-header p { font-size: 16px; color: var(--text-sub); }

/* AI Shorts / Hot */
.ai-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.ai-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform 0.3s;
}
.ai-card:hover { transform: translateY(-4px); }
.ai-img { width: 100%; aspect-ratio: 3/4; object-fit: cover; }
.ai-info { padding: 16px; }
.ai-info h3 { font-size: 16px; margin-bottom: 8px; color: var(--accent); }
.ai-info p { font-size: 13px; color: var(--text-sub); margin-bottom: 12px; }
.ai-meta { display: flex; justify-content: space-between; font-size: 12px; color: #777; }

/* Hot Grid */
.hot-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.hot-card {
  background: var(--bg-panel);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}
.hot-img { width: 100%; aspect-ratio: 3/4; object-fit: cover; }
.hot-info { padding: 16px; }
.hot-info h3 { font-size: 15px; margin-bottom: 8px; }
.hot-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.hot-tag { font-size: 11px; padding: 2px 8px; background: rgba(255, 183, 3, 0.1); color: var(--accent); border-radius: 4px; }
.hot-date { font-size: 12px; color: var(--text-sub); }

/* Steps */
.steps-container { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.step-item {
  flex: 1;
  min-width: 200px;
  background: var(--bg-panel);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  position: relative;
}
.step-num {
  width: 32px; height: 32px;
  background: var(--gradient-gold);
  color: #000;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: bold; font-size: 16px;
  margin-bottom: 16px;
}
.step-item h3 { font-size: 16px; margin-bottom: 8px; }
.step-item p { font-size: 14px; color: var(--text-sub); }
.step-list { margin-top: 32px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.step-list-item { display: flex; gap: 12px; align-items: flex-start; font-size: 14px; color: var(--text-sub); }
.step-list-item span { color: var(--accent); font-weight: bold; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 20px;
}
.faq-q { font-size: 16px; font-weight: 600; margin-bottom: 8px; display: flex; gap: 8px; }
.faq-q::before { content: "Q"; color: var(--accent); font-weight: 900; }
.faq-a { font-size: 14px; color: var(--text-sub); padding-left: 20px; position: relative; }
.faq-a::before { content: "A"; position: absolute; left: 0; color: var(--accent); font-weight: 900; }

/* Reviews */
.review-wall { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.review-card {
  background: var(--bg-panel);
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.review-user { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar { width: 40px; height: 40px; border-radius: 50%; background: var(--gradient-gold); display: flex; align-items: center; justify-content: center; font-weight: bold; color: #000; }
.review-name { font-weight: 600; font-size: 14px; }
.review-stars { color: var(--accent); font-size: 12px; }
.review-content { font-size: 14px; color: var(--text-sub); line-height: 1.7; }
.review-meta { margin-top: 12px; font-size: 12px; color: #666; text-align: right; }

/* Privacy */
.privacy-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.privacy-card { background: var(--bg-card); padding: 24px; border-radius: var(--radius); border: 1px solid var(--border); }
.privacy-card h3 { font-size: 16px; color: var(--accent); margin-bottom: 12px; }
.privacy-card p { font-size: 14px; color: var(--text-sub); margin-bottom: 8px; }

/* Creator */
.creator-box {
  background: linear-gradient(135deg, rgba(255,183,3,0.1), rgba(22,26,38,1));
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 40px;
  display: flex;
  gap: 40px;
  align-items: center;
}
.creator-content { flex: 1; }
.creator-content h2 { font-size: 28px; margin-bottom: 16px; color: var(--accent); }
.creator-content p { font-size: 15px; color: var(--text-sub); margin-bottom: 12px; }
.creator-benefits { margin-top: 24px; display: flex; flex-direction: column; gap: 12px; }
.creator-benefit { display: flex; gap: 12px; font-size: 14px; color: var(--text-main); }
.creator-benefit span { color: var(--accent); }

/* Community */
.community-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  background: var(--bg-panel);
  border-radius: var(--radius);
  padding: 32px;
}
.community-item { padding: 16px; border-bottom: 1px solid var(--border); }
.community-item:last-child { border-bottom: none; }
.community-item h3 { font-size: 16px; margin-bottom: 8px; }
.community-item p { font-size: 14px; color: var(--text-sub); }

/* Download Footer */
.download-footer {
  background: linear-gradient(180deg, var(--bg-dark) 0%, #1a1e2e 100%);
  padding: 80px 20px;
  text-align: center;
  border-top: 1px solid var(--border);
}
.download-footer h2 { font-size: 32px; margin-bottom: 12px; color: var(--accent); }
.download-footer p { font-size: 16px; color: var(--text-sub); margin-bottom: 32px; }
.download-footer .steps-brief {
  max-width: 800px;
  margin: 0 auto 40px;
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  text-align: left;
}
.steps-brief-item { display: flex; gap: 12px; align-items: flex-start; font-size: 14px; color: var(--text-sub); }
.steps-brief-item strong { color: var(--accent); }

/* Global Footer */
.site-footer {
  background: var(--bg-dark);
  padding: 40px 20px;
  text-align: center;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: #666;
}
.site-footer p { margin-bottom: 8px; }
.site-footer a { color: #888; }
.site-footer a:hover { color: var(--accent); }
.update-time { font-size: 12px; color: #555; margin-top: 8px; }

/* Responsive */
@media (max-width: 1024px) {
  .ai-grid { grid-template-columns: 1fr 1fr; }
  .hot-grid { grid-template-columns: repeat(3, 1fr); }
  .creator-box { flex-direction: column; padding: 30px; }
}
@media (max-width: 768px) {
  .hero h1 { font-size: 28px; }
  .hero { padding: 100px 16px 40px; }
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }
  .ai-grid { grid-template-columns: 1fr; }
  .hot-grid { grid-template-columns: 1fr 1fr; }
  .review-wall, .privacy-grid, .community-box { grid-template-columns: 1fr; }
  .steps-container { flex-direction: column; }
  .step-list { grid-template-columns: 1fr; }
  .download-group { flex-direction: column; align-items: stretch; }
  .btn-device { flex-direction: row; justify-content: flex-start; }
  .download-footer .steps-brief { flex-direction: column; gap: 16px; }
  .section { padding: 60px 16px; }
  .section-header h2 { font-size: 26px; }
}