* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: #1a1a1a;
  background: #ffffff;
}

:root {
  --brand: #1463f3;
  --brand-700: #0f4fd0;
  --accent: #00b894;
  --text: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --bg-alt: #f8fafc;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(1.2) blur(6px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.5px;
}
.nav a {
  color: var(--text);
  text-decoration: none;
  margin-left: 16px;
  font-weight: 600;
}
.nav a:hover { color: var(--brand); }

.btn { display: inline-block; padding: 10px 14px; border-radius: 10px; text-decoration: none; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-700); }
.btn-secondary { background: #eef2ff; color: var(--brand); }
.btn-outline { border: 1px solid var(--border); padding: 8px 12px; border-radius: 8px; }

.hero {
  position: relative;
  min-height: 62vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; background-size: cover; background-position: center 38%; filter: brightness(0.6);
}
.hero-content {
  position: relative; z-index: 1; color: #fff; padding: 60px 0;
}
.hero h1 { font-size: 36px; margin-bottom: 16px; text-shadow: 0 2px 8px rgba(0,0,0,0.25); }
.hero p { max-width: 700px; line-height: 1.8; text-shadow: 0 1px 6px rgba(0,0,0,0.2); }
.hero-actions { margin-top: 18px; }
.hero-actions .btn { margin-right: 10px; }

.section { padding: 64px 0; }
.section.alt { background: var(--bg-alt); }
.section h2 { font-size: 28px; margin: 0 0 14px; }
.section p { color: var(--text); line-height: 1.8; }
.key-points { margin: 16px 0 0; padding: 0 0 0 18px; }
.key-points li { margin-bottom: 8px; color: var(--muted); }

.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.features.cols-2 { grid-template-columns: repeat(2, 1fr); }
.feature { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.feature h3 { margin: 0 0 8px; font-size: 18px; }
.feature p { color: var(--muted); }

.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.gallery-grid img { width: 100%; aspect-ratio: 9/16; height: auto; object-fit: cover; border-radius: 10px; cursor: pointer; border: 1px solid var(--border); transition: transform 0.2s ease; }
.gallery-grid img:hover { transform: scale(1.01); }

.lightbox { position: fixed; inset: 0; background: rgba(0,0,0,0.75); display: none; align-items: center; justify-content: center; z-index: 100; }
.lightbox.open { display: flex; }
.lightbox img { max-width: min(92vw, 1200px); max-height: 85vh; border-radius: 10px; box-shadow: 0 10px 30px rgba(0,0,0,0.4); }
.lightbox-close { position: absolute; top: 18px; right: 22px; background: transparent; color: #fff; font-size: 28px; border: none; cursor: pointer; }

.faq { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.qa { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.qa h3 { margin: 0 0 10px; }
.qa p { color: var(--muted); }

.contact { color: var(--muted); }
.contact li { margin-bottom: 6px; }

.site-footer { background: #0f172a; color: #cbd5e1; }
.site-footer .container { display: flex; align-items: center; justify-content: space-between; padding: 20px 20px; }
.site-footer a { color: #cbd5e1; text-decoration: none; margin-left: 10px; }
.site-footer a:hover { text-decoration: underline; }

/* Gallery items with captions */
.gallery-item { display: flex; flex-direction: column; }
.gallery-item .caption { margin-top: 6px; font-size: 13px; color: var(--muted); text-align: center; }

/* Lightbox caption overlay */
.lightbox-caption { position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%); background: rgba(0,0,0,0.55); color: #fff; padding: 8px 12px; border-radius: 8px; max-width: 90vw; text-align: center; box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

/* Lightbox navigation */
.lightbox-nav { position: absolute; top: 50%; transform: translateY(-50%); width: 44px; height: 44px; border-radius: 999px; border: none; background: rgba(0,0,0,0.55); color: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; z-index: 101; }
.lightbox-nav.prev { left: 12px; }
.lightbox-nav.next { right: 12px; }
.lightbox-nav:active { transform: translateY(-50%) scale(0.98); }

body.no-scroll { overflow: hidden; }

@media (max-width: 980px) {
  .features { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .faq { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .hero { min-height: 54vh; }
  .hero h1 { font-size: 28px; }
  .gallery-grid { grid-template-columns: 1fr; }
  .lightbox-nav { width: 52px; height: 52px; }
  .lightbox-close { font-size: 32px; }
  .hero-bg { filter: brightness(0.5); background-position: center 42%; }
}