:root {
  --primary-blue: #165DFF;
  --light-blue: #E8F0FE;
  --bg-white: #FFFFFF;
  --text-main: #1D2129;
  --text-muted: #4E5969;
  --border-color: #E5E6EB;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; color: var(--text-main); background: var(--bg-white); line-height: 1.6; }
a { text-decoration: none; color: var(--primary-blue); }
img { max-width: 100%; display: block; object-fit: cover; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
header { position: sticky; top: 0; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-color); z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 20px; color: var(--primary-blue); }
.brand img { height: 32px; }
.nav-links { display: none; font-size: 15px; }
.nav-links a { color: var(--text-main); margin-left: 24px; transition: color 0.2s; }
.nav-links a:hover { color: var(--primary-blue); }
.btn-download { background: var(--primary-blue); color: #fff !important; padding: 8px 20px; border-radius: 20px; font-weight: 500; }

/* Hero */
.hero { padding: 60px 0; background: linear-gradient(135deg, #F0F5FF 0%, #FFFFFF 100%); }
.hero-inner { display: flex; flex-direction: column; gap: 40px; }
.hero-text { max-width: 600px; }
.hero h1 { font-size: 36px; line-height: 1.3; margin-bottom: 20px; color: var(--text-main); }
.hero h1 span { color: var(--primary-blue); }
.hero p { font-size: 18px; color: var(--text-muted); margin-bottom: 30px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary { display: inline-block; background: var(--primary-blue); color: #fff; padding: 14px 32px; border-radius: 8px; font-size: 16px; font-weight: 600; transition: background 0.2s; }
.btn-primary:hover { background: #0040C0; }

/* Sections */
section { padding: 80px 0; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 28px; color: var(--text-main); margin-bottom: 12px; }
.section-title p { color: var(--text-muted); font-size: 16px; }

/* Cards */
.card-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: 16px; overflow: hidden; transition: transform 0.2s, box-shadow 0.2s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 24px rgba(22, 93, 255, 0.08); }
.card img { width: 100%; height: 200px; }
.card-content { padding: 24px; }
.card-content h3 { font-size: 20px; margin-bottom: 12px; color: var(--text-main); }
.card-content p { font-size: 15px; color: var(--text-muted); }

/* Feature List */
.feature-list { display: grid; grid-template-columns: 1fr; gap: 24px; }
.feature-item { display: flex; gap: 20px; align-items: flex-start; }
.feature-icon { width: 48px; height: 48px; border-radius: 12px; background: var(--light-blue); color: var(--primary-blue); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 20px; flex-shrink: 0; }
.feature-text h3 { font-size: 18px; margin-bottom: 8px; }
.feature-text p { font-size: 15px; color: var(--text-muted); }

/* Gallery */
.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.gallery img { width: 100%; height: 180px; border-radius: 12px; }

/* Footer */
footer { background: #F7F8FA; border-top: 1px solid var(--border-color); padding: 40px 0; font-size: 13px; color: #86909C; text-align: center; }
footer p { margin-bottom: 8px; }
footer a { color: #86909C; }
footer time { font-style: normal; }

/* Responsive */
@media (min-width: 768px) {
  .nav-links { display: flex; align-items: center; }
  .hero-inner { flex-direction: row; align-items: center; justify-content: space-between; }
  .hero-text { flex: 1; padding-right: 40px; }
  .hero-image { flex: 1; }
  .hero-image img { border-radius: 24px; box-shadow: 0 20px 40px rgba(0,0,0,0.1); }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-list { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(3, 1fr); }
  .gallery img { height: 220px; }
}

@media (min-width: 1024px) {
  .hero h1 { font-size: 48px; }
  .card-grid { grid-template-columns: repeat(3, 1fr); }
  .gallery { grid-template-columns: repeat(4, 1fr); }
  .gallery img { height: 260px; }
}