@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700&display=swap');

:root {
  --brand: #e36838;
  --brand-soft: rgba(227, 104, 56, 0.15);
  --bg-main: #121212;
  --bg-card: #1a1a1a;
  --bg-muted: #2a2a2a;
  --text: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #808080;
  --btn-bg: #e8e8e8;
  --btn-text: #1a1a1a;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Noto Sans SC', -apple-system, sans-serif;
  background: linear-gradient(180deg, rgba(18,18,18,0.85) 0%, rgba(18,18,18,0.95) 100%),
    linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  background-color: var(--bg-main);
  color: var(--text);
  min-height: 100vh;
}

.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 2rem; max-width: 1400px; margin: 0 auto;
}
.nav-logo {
  display: flex; align-items: center; gap: 0.5rem;
  text-decoration: none; color: inherit;
}
.nav-logo img { width: 32px; height: 32px; border-radius: 8px; }
.nav-logo span { font-size: 1.1rem; font-weight: 600; }
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; }
.nav-links a:hover { color: var(--text); }

.hero {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4rem;
  max-width: 1200px; margin: 0 auto; padding: 3rem 2rem 4rem;
  align-items: center; min-height: calc(100vh - 80px);
}

.hero-logo { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.hero-logo img { width: 80px; height: 80px; border-radius: 20px; }
.hero-logo-text { font-size: 2.5rem; font-weight: 700; letter-spacing: 0.05em; }
.hero-logo-text .brand { color: var(--brand); }
.hero-logo-text .white { color: var(--text); }

.hero-slogan { color: var(--text-secondary); font-size: 1rem; margin-bottom: 2rem; font-weight: 400; }

.intro {
  background: var(--bg-card); border-radius: 12px; padding: 1.25rem 1.5rem;
  margin-bottom: 2rem; border-left: 3px solid var(--brand);
}
.intro h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text); }
.intro p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

.download-row { display: flex; gap: 1rem; }
.download-btn-wrap { position: relative; flex: 1; }
.download-platform {
  flex: 1; display: flex; align-items: center; justify-content: center; gap: 0.5rem;
  background: var(--btn-bg); color: var(--btn-text); padding: 0.875rem 1.5rem;
  border-radius: 12px; font-size: 0.95rem; font-weight: 500;
  text-decoration: none; transition: opacity 0.2s;
}
.download-platform:hover { opacity: 0.9; }
.download-platform i { font-size: 1.25rem; }
.download-overlay {
  position: absolute; inset: 0; opacity: 0; z-index: 1; cursor: pointer;
}

.download-links { margin-top: 1.5rem; display: flex; gap: 2rem; }
.download-links a { color: var(--text-secondary); font-size: 0.9rem; text-decoration: none; }
.download-links a:hover { color: var(--brand); }

.hero-right {
  display: flex; align-items: flex-end; justify-content: center;
  position: relative; min-height: 360px;
}
.hero-screens {
  position: relative; display: flex; align-items: flex-end;
  justify-content: center; width: 100%; max-width: 600px;
}
.hero-screen.desktop { max-width: 75%; height: auto; display: block; z-index: 1; }
.hero-screen.mobile {
  max-width: 32%; height: auto; display: block;
  position: absolute; right: -5%; bottom: 0; z-index: 2;
}

.reviews-section { max-width: 1200px; margin: 0 auto; padding: 3rem 2rem; }
.reviews-section h2 { font-size: 1.5rem; font-weight: 600; margin-bottom: 1.5rem; text-align: center; }
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.review-card {
  background: var(--bg-card); border-radius: 12px; padding: 1.25rem;
  border: 1px solid rgba(255,255,255,0.06);
}
.review-stars { color: var(--brand); font-size: 0.9rem; margin-bottom: 0.75rem; }
.review-text { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 1rem; }
.review-user { display: flex; align-items: center; gap: 0.5rem; }
.review-avatar { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }
.review-name { font-size: 0.85rem; font-weight: 500; color: var(--text); }
.review-meta { font-size: 0.75rem; color: var(--text-muted); }

.knowledge-section { max-width: 1200px; margin: 0 auto; padding: 3rem 2rem; }
.knowledge-section h2 { font-size: 1.5rem; font-weight: 600; margin-bottom: 1.5rem; text-align: center; }
.knowledge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.25rem; }
.knowledge-card {
  background: var(--bg-card); border-radius: 12px; padding: 1.25rem 1.5rem;
  border: 1px solid rgba(255,255,255,0.06); border-left: 3px solid var(--brand);
}
.knowledge-card h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text); }
.knowledge-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }

footer { text-align: center; padding: 2rem; font-size: 0.85rem; color: var(--text-muted); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; text-align: center; }
  .hero-left { order: 1; }
  .hero-logo { justify-content: center; }
  .hero-right { order: 2; }
  .hero-screens { flex-direction: column; align-items: center; gap: 1.5rem; }
  .hero-screen.desktop { max-width: 85%; }
  .hero-screen.mobile { position: static; max-width: 45%; }
  .download-row { flex-direction: column; }
  .download-links { justify-content: center; }
  .nav-links { gap: 1rem; }
}