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

:root {
  --color-primary: #2563EB;
  --color-bg: #F0F7FF;
  --color-card: #FFFFFF;
  --color-text: #1E293B;
  --color-text-dim: #64748B;
  --color-border: #E2E8F0;
  --color-tag-bg: #EFF6FF;
  --color-tag-text: #2563EB;
  --radius-sm: 8px;
  --radius-md: 12px;
  --shadow-card: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-hover: 0 4px 12px rgba(37,99,235,.12), 0 2px 4px rgba(0,0,0,.06);
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-heading: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }
body { font-family: var(--font-body); background: var(--color-bg); color: var(--color-text); line-height: 1.6; min-height: 100vh; }

/* ===== Header ===== */
.site-header { background: rgba(255,255,255,0.92); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 100; backdrop-filter: blur(8px); }
.header-inner { max-width: 1280px; margin: 0 auto; padding: 16px 24px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.logo { font-family: var(--font-heading); font-size: 20px; font-weight: 700; color: var(--color-primary); text-decoration: none; white-space: nowrap; }
.logo span { color: var(--color-text-dim); font-weight: 400; font-size: 14px; margin-left: 8px; }

.region-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.region-nav a { padding: 6px 14px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 500; color: var(--color-text-dim); text-decoration: none; transition: all .2s; white-space: nowrap; }
.region-nav a:hover, .region-nav a:focus { background: var(--color-tag-bg); color: var(--color-primary); }

/* ===== Hero ===== */
.hero { text-align: center; padding: 64px 24px 40px; max-width: 800px; margin: 0 auto; }
.hero h1 { font-family: var(--font-heading); font-size: clamp(28px, 5vw, 40px); font-weight: 800; color: var(--color-text); margin-bottom: 12px; letter-spacing: -.02em; }
.hero .subtitle { font-size: 17px; color: var(--color-text-dim); margin-bottom: 8px; }
.hero .count { display: inline-flex; align-items: center; gap: 6px; background: var(--color-tag-bg); color: var(--color-primary); font-size: 14px; font-weight: 600; padding: 6px 16px; border-radius: 20px; margin-top: 12px; }

/* ===== Search ===== */
.search-wrap { max-width: 480px; margin: 0 auto 48px; padding: 0 24px; position: relative; }
.search-icon { position: absolute; left: 38px; top: 50%; transform: translateY(-50%); font-size: 16px; pointer-events: none; z-index: 1; line-height: 1; }
.search-wrap input { width: 100%; padding: 14px 20px 14px 44px; border: 2px solid var(--color-border); border-radius: var(--radius-md); font-size: 15px; font-family: var(--font-body); outline: none; transition: border-color .2s; background: #fff; color: var(--color-text); }
.search-wrap input:focus { border-color: var(--color-primary); }
.search-wrap input::placeholder { color: #94A3B8; font-size: 14px; }
.search-empty { text-align: center; color: var(--color-text-dim); font-size: 14px; padding: 32px 24px; display: none; }

/* ===== Region Sections ===== */
main { max-width: 1280px; margin: 0 auto; padding: 0 24px 64px; }

.region-section { margin-bottom: 48px; }
.region-section:target .region-title { color: var(--color-primary); }
.region-title { font-family: var(--font-heading); font-size: 22px; font-weight: 700; margin-bottom: 4px; display: flex; align-items: center; gap: 10px; scroll-margin-top: 80px; }
.region-title::before { content: ''; display: inline-block; width: 4px; height: 24px; background: var(--color-primary); border-radius: 2px; }
.region-desc { font-size: 14px; color: var(--color-text-dim); margin-bottom: 20px; padding-left: 14px; }

/* ===== City Grid ===== */
.city-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }

.city-card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 20px 22px; text-decoration: none; color: inherit; transition: all .2s; display: flex; flex-direction: column; gap: 6px; position: relative; overflow: hidden; }
.city-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--color-primary); opacity: 0; transition: opacity .2s; }
.city-card:hover { box-shadow: var(--shadow-hover); border-color: var(--color-primary); transform: translateY(-2px); }
.city-card:hover::before { opacity: 1; }
.city-card .city-name { font-family: var(--font-heading); font-size: 17px; font-weight: 700; color: var(--color-text); }
.city-card .city-tagline { font-size: 13px; color: var(--color-text-dim); line-height: 1.4; }
.city-card .city-url { font-size: 11px; color: var(--color-primary); opacity: .7; font-family: monospace; word-break: break-all; margin-top: 2px; }

.city-card.hidden { display: none; }

/* ===== Footer ===== */
.site-footer { background: #fff; border-top: 1px solid var(--color-border); text-align: center; padding: 32px 24px; font-size: 13px; color: var(--color-text-dim); }
.site-footer a { color: var(--color-primary); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.site-footer .brand { font-weight: 600; color: var(--color-text); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .region-nav { gap: 2px; }
  .region-nav a { padding: 4px 10px; font-size: 12px; }
  .hero { padding: 40px 20px 24px; }
  .city-grid { grid-template-columns: 1fr; }
  .city-card { padding: 16px 18px; }
  .region-title { font-size: 19px; scroll-margin-top: 140px; }
}

@media (min-width: 1200px) {
  .city-grid { grid-template-columns: repeat(4, 1fr); }
}