:root {
  --bg: #f3f6fb;
  --card: #ffffff;
  --ink: #1a2433;
  --muted: #6a7689;
  --line: #e3e9f2;
  --brand: #1a5fb4;      /* 政务蓝 */
  --brand-dark: #14498c;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(20,40,80,.06);
  --maxw: 1080px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--ink); line-height: 1.65; font-size: 15px; }
a { color: inherit; text-decoration: none; }

.nav { background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.nav-in { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; height: 58px; display: flex; align-items: center; justify-content: space-between; }
.brand { font-weight: 800; font-size: 18px; color: var(--brand); display: flex; align-items: baseline; gap: 9px; }
.brand-dom { color: var(--muted); font-weight: 400; font-size: 12px; }
.nav-city { font-size: 13px; color: var(--muted); }
.city-btn { border: 1px solid var(--line); background: #fff; color: var(--brand); font-weight: 600; padding: 5px 12px; border-radius: 18px; cursor: pointer; font-size: 13px; }

.hero { background: linear-gradient(160deg, #e8f0fb, #f3f6fb 70%); padding: 54px 22px 44px; }
.hero-in { max-width: var(--maxw); margin: 0 auto; }
.hero h1 { font-size: 34px; font-weight: 800; }
.hero h1 span { color: var(--brand); }
.hero-sub { color: var(--muted); font-size: 16px; margin-top: 12px; max-width: 560px; }
.searchbar { display: flex; gap: 10px; margin-top: 26px; max-width: 620px; }
.searchbar input { flex: 1; padding: 13px 16px; border: 1px solid var(--line); border-radius: 10px; font-size: 15px; background: #fff; }
.searchbar input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(26,95,180,.1); }
.btn { background: var(--brand); color: #fff; border: none; padding: 0 26px; border-radius: 10px; font-size: 15px; font-weight: 600; cursor: pointer; }
.btn:hover { background: var(--brand-dark); }

.section { max-width: var(--maxw); margin: 0 auto; padding: 44px 22px; }
.sec-t { font-size: 20px; font-weight: 800; margin-bottom: 20px; }
.sec-t::before { content: ''; display: inline-block; width: 4px; height: 16px; background: var(--brand); border-radius: 2px; margin-right: 9px; vertical-align: -2px; }

/* 城市选择 */
.city-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 10px; }
.city-chip { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 12px 8px; text-align: center; font-size: 14.5px; font-weight: 600; box-shadow: var(--shadow); transition: all .15s; }
.city-chip:hover { border-color: var(--brand); color: var(--brand); }

/* 办事分类 */
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 12px; }
.cat-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); transition: all .15s; display: block; }
.cat-card:hover { border-color: var(--brand); transform: translateY(-2px); }
.cat-n { font-weight: 700; font-size: 15.5px; }
.cat-n::before { content: ''; display: inline-block; width: 7px; height: 7px; background: var(--brand); border-radius: 2px; margin-right: 8px; vertical-align: 1px; }
.cat-d { color: var(--muted); font-size: 12.5px; margin-top: 4px; }

/* 办事指南 */
.guide-list { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.guide-row { display: flex; align-items: center; gap: 14px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.guide-row:last-child { border-bottom: none; }
.guide-row:hover { background: #fafcff; }
.g-cat { font-size: 12px; color: var(--brand); background: #e8f0fb; padding: 2px 10px; border-radius: 18px; flex-shrink: 0; width: 56px; text-align: center; }
.g-t { font-size: 14.5px; }
.note { color: var(--muted); font-size: 12.5px; margin-top: 14px; text-align: center; }

.foot { border-top: 1px solid var(--line); background: #fff; margin-top: 20px; }
.foot-in { max-width: var(--maxw); margin: 0 auto; padding: 26px 22px; text-align: center; }
.foot-brand { font-weight: 700; color: var(--brand); }
.foot-note { color: var(--muted); font-size: 12.5px; margin-top: 6px; }
.foot-note a { color: var(--brand); }

@media (max-width: 640px) { .hero h1 { font-size: 26px; } .searchbar { flex-wrap: wrap; } }