:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-alt: #f1f5fb;
  --text: #1f2937;
  --muted: #667085;
  --primary: #3b82f6;
  --primary-fore: #ffffff;
  --border: #d0d8e6;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--text);
  background: linear-gradient(180deg, #eef2f7, #f7f9fc 40%, #f7f9fc);
  font: 14px/1.6 system-ui, -apple-system, Segoe UI, Roboto, "Microsoft YaHei", Arial;
}

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: saturate(180%) blur(10px);
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 6px 20px rgba(16, 24, 40, 0.06);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; color: var(--text); text-decoration: none; }
.brand-icon { width: 28px; height: 28px; border-radius: 6px; margin-right: 10px; }
.brand-name { font-weight: 600; letter-spacing: 0.2px; }
.nav a { color: var(--muted); text-decoration: none; margin-left: 18px; }
.nav a:hover, .nav .nav-download { color: var(--primary); }

.hero { padding: 72px 0 56px; background: radial-gradient(600px 220px at 20% 0%, #e2ecff80, transparent), radial-gradient(600px 220px at 80% 0%, #e8f2ff60, transparent); }
.hero-inner { text-align: center; }
.hero h1 { font-size: 32px; margin: 0 0 12px; }
.subtitle { color: var(--muted); margin: 0 auto 22px; max-width: 760px; }
.cta { display: inline-flex; gap: 12px; }

.btn { display: inline-block; padding: 10px 16px; border-radius: 10px; border: 1px solid var(--border); text-decoration: none; color: var(--text); background: var(--surface); box-shadow: 0 4px 12px rgba(16,24,40,0.06); }
.btn:hover { border-color: #b8c2d3; box-shadow: 0 6px 16px rgba(16,24,40,0.08); }
.btn-primary { background: var(--primary); border-color: #2f66c6; color: var(--primary-fore); }
.btn-primary:hover { background: #2f66c6; }
.btn-secondary { background: var(--surface-alt); }
.btn-lg { padding: 12px 18px; font-weight: 600; }

.section { padding: 48px 0; }
.section-alt { background: #f7fbff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-title { font-size: 22px; margin: 0 0 18px; }

.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px; box-shadow: 0 6px 20px rgba(16,24,40,0.06); }
.card h3 { margin: 0 0 8px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); }

.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.gallery-grid .shot { display: block; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--surface-alt); }
.gallery-grid img { width: 100%; display: block; aspect-ratio: 16/10; object-fit: cover; }
.gallery-grid .shot:hover { border-color: #b8c2d3; }

.lightbox { position: fixed; inset: 0; background: rgba(0,0,0,0.7); display: grid; place-items: center; z-index: 100; }
.lightbox[hidden] { display: none !important; }
.lightbox-img { max-width: 92vw; max-height: 88vh; border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,0.3); }
.lightbox-close { position: absolute; top: 16px; right: 20px; background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; cursor: pointer; }

.lightbox-prev, .lightbox-next {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); cursor: pointer;
  box-shadow: 0 6px 16px rgba(16,24,40,0.12);
  display: grid; place-items: center; font-size: 22px; line-height: 1;
}
.lightbox-prev { left: 16px; }
.lightbox-next { right: 16px; }
.lightbox-prev:hover, .lightbox-next:hover { border-color: #b8c2d3; }

.pricing { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.pricing-item { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px; box-shadow: 0 6px 20px rgba(16,24,40,0.06); }
.pricing-item h3 { margin: 0 0 8px; }
.pricing-item ul { margin: 0 0 14px; padding-left: 18px; color: var(--muted); }
.contact-box { background: var(--surface-alt); border: 1px dashed var(--border); border-radius: 10px; padding: 12px; }
.contact { font-weight: 600; color: var(--text); }
.note { color: var(--muted); font-size: 12px; }

.download-desc { color: var(--muted); margin-bottom: 10px; }
.download-box { display: flex; align-items: center; gap: 12px; }
.file-note { color: var(--muted); }
.helper-links a { color: var(--muted); }
.helper-links a:hover { color: var(--primary); }

.site-footer { border-top: 1px solid var(--border); padding: 20px 0; background: #ffffffcc; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 12px; }

@media (max-width: 960px) {
  .features-grid { grid-template-columns: 1fr 1fr; }
  .gallery-grid { grid-template-columns: 1fr 1fr; }
  .pricing { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .features-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .header-inner { height: auto; padding: 10px 0; }
  .nav { display: none; }
  .hero { padding: 52px 0 38px; }
}