:root {
  --bg-dark: #0f111a;
  --bg-card: #1a1d2d;
  --bg-card-hover: #23273a;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --accent: #f59e0b;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --border-color: #2d3147;
  --radius: 12px;
  --radius-lg: 24px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
img { max-width: 100%; display: block; object-fit: cover; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 24px; border-radius: 30px; font-weight: 600;
  transition: all 0.3s ease; cursor: pointer; border: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(59,130,246,0.3); }
.btn-secondary { background: rgba(255,255,255,0.1); color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: rgba(255,255,255,0.15); transform: translateY(-2px); }

/* Header */
header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 100;
  background: rgba(15, 17, 26, 0.9); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}
.nav-bar { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.logo-group { display: flex; align-items: center; gap: 12px; }
.logo-group img { height: 32px; width: auto; }
.logo-group span { font-size: 20px; font-weight: 700; letter-spacing: 1px; }
.nav-links { display: flex; gap: 24px; font-size: 15px; color: var(--text-muted); }
.nav-links a:hover { color: var(--text-main); }

/* Hero */
.hero {
  padding: 140px 0 80px; text-align: center;
  background: radial-gradient(circle at top, #1e264a 0%, var(--bg-dark) 60%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; top: -50%; left: 50%; transform: translateX(-50%);
  width: 100%; max-width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, transparent 70%);
  z-index: 0; pointer-events: none;
}
.hero-content { position: relative; z-index: 1; }
.hero h1 { font-size: 48px; line-height: 1.2; margin-bottom: 20px; background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 18px; color: var(--text-muted); max-width: 700px; margin: 0 auto 40px; }
.download-group { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
.download-group .btn { min-width: 160px; }

/* Section Common */
section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-header h2 { font-size: 32px; margin-bottom: 12px; }
.section-header p { color: var(--text-muted); font-size: 16px; }

/* Grid */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

/* Cards */
.card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 24px; border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}
.card:hover { background: var(--bg-card-hover); transform: translateY(-4px); border-color: var(--primary); }

/* Poster Wall */
.poster-wall { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.poster-item { position: relative; border-radius: var(--radius); overflow: hidden; }
.poster-item img { width: 100%; aspect-ratio: 3/4; transition: transform 0.3s; }
.poster-item:hover img { transform: scale(1.05); }
.poster-info {
  position: absolute; bottom: 0; left: 0; width: 100%;
  padding: 20px 12px 12px; background: linear-gradient(transparent, rgba(0,0,0,0.9));
}
.poster-info h3 { font-size: 16px; margin-bottom: 4px; }
.poster-info .tag { font-size: 12px; background: rgba(255,255,255,0.2); padding: 2px 6px; border-radius: 4px; margin-right: 4px; }
.poster-info .date { font-size: 12px; color: var(--text-muted); display: block; margin-top: 4px; }

/* Steps */
.steps-list { display: flex; flex-direction: column; gap: 16px; }
.step-item { display: flex; align-items: center; gap: 20px; background: var(--bg-card); padding: 20px; border-radius: var(--radius); border: 1px solid var(--border-color); }
.step-num { width: 40px; height: 40px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; }
.step-text h3 { font-size: 18px; margin-bottom: 4px; }
.step-text p { font-size: 14px; color: var(--text-muted); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 16px; }
.faq-item { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border-color); overflow: hidden; }
.faq-item summary { padding: 20px; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 20px; color: var(--text-muted); }
.faq-item[open] summary::after { content: "-"; }
.faq-content { padding: 0 20px 20px; color: var(--text-muted); font-size: 14px; }

/* Reviews */
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card { background: var(--bg-card); padding: 24px; border-radius: var(--radius); border: 1px solid var(--border-color); }
.review-user { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.review-avatar { width: 40px; height: 40px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; }
.review-text { font-size: 14px; color: var(--text-muted); }

/* Creator */
.creator-box { background: linear-gradient(135deg, #1e264a 0%, #111322 100%); border-radius: var(--radius-lg); padding: 40px; border: 1px solid var(--primary); text-align: center; }
.creator-box h2 { font-size: 28px; margin-bottom: 16px; }
.creator-box p { color: var(--text-muted); margin-bottom: 24px; }
.creator-features { display: flex; justify-content: center; gap: 40px; margin-bottom: 30px; }
.creator-feature { text-align: center; }
.creator-feature i { display: block; font-size: 24px; margin-bottom: 8px; }

/* Footer */
footer { border-top: 1px solid var(--border-color); padding: 40px 0; text-align: center; color: var(--text-muted); font-size: 13px; }
footer p { margin-bottom: 10px; }
footer a { color: var(--text-muted); text-decoration: underline; }
footer a:hover { color: var(--text-main); }

/* Responsive */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .poster-wall { grid-template-columns: repeat(4, 1fr); }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .grid-3 { grid-template-columns: 1fr; }
  .poster-wall { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: 1fr; }
  .creator-features { flex-direction: column; gap: 20px; }
  .step-item { flex-direction: column; align-items: flex-start; text-align: left; }
}