:root{
  --ink:#20241f; --muted:#6b7068; --line:#e3e0d8; --bg:#faf8f3; --card:#fff;
  --accent:#0f6b5c; --accent-soft:#e7f2ef; --warm:#b4652a;
  --radius:14px; --shadow:0 1px 2px rgba(32,36,31,.05),0 8px 24px rgba(32,36,31,.06);
  --max:1080px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  line-height:1.75; font-size:16px;
}
a{color:inherit; text-decoration:none}
img{max-width:100%; height:auto}
.wrap{max-width:var(--max); margin:0 auto; padding:0 20px}
.narrow{max-width:720px}
.muted{color:var(--muted)}
.small{font-size:13.5px}

/* header */
.site-head{
  position:sticky; top:0; z-index:20;
  background:rgba(250,248,243,.86); backdrop-filter:saturate(1.2) blur(10px);
  border-bottom:1px solid var(--line);
}
.head-inner{display:flex; align-items:center; justify-content:space-between; height:62px}
.brand{display:flex;align-items:center}
.brand img{height:30px;width:auto;display:block}
.nav{display:flex; gap:22px}
.nav a{font-size:14.5px; color:var(--muted); transition:color .15s}
.nav a:hover{color:var(--accent)}

/* hero */
.hero{
  padding:84px 0 72px;
  background:
    radial-gradient(1100px 420px at 12% -10%, #e9f2ee 0%, transparent 60%),
    radial-gradient(800px 380px at 88% 0%, #f6ecdd 0%, transparent 55%);
  border-bottom:1px solid var(--line);
}
.kicker{font-size:12px; letter-spacing:.22em; color:var(--warm); margin:0 0 14px}
.hero h1{font-size:clamp(28px,4.6vw,44px); line-height:1.28; margin:0 0 16px; letter-spacing:.01em}
.lede{color:var(--muted); font-size:16.5px; max-width:640px}
.hero-actions{display:flex; gap:12px; margin-top:30px; flex-wrap:wrap}

.btn{
  display:inline-block; padding:10px 20px; border-radius:999px; border:1px solid var(--accent);
  background:var(--accent); color:#fff; font-size:14.5px; cursor:pointer; transition:.18s;
}
.btn:hover{transform:translateY(-1px); box-shadow:0 6px 18px rgba(15,107,92,.20)}
.btn.ghost{background:transparent; color:var(--accent)}
.btn[disabled]{opacity:.6; cursor:default; transform:none; box-shadow:none}

/* sections */
.section{padding:56px 20px}
.section-head{margin-bottom:24px}
.section-head h1,.section-head h2{font-size:24px; margin:0 0 8px}
.grid{display:grid; gap:18px}
.grid.three{grid-template-columns:repeat(3,1fr)}
.card{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:22px; box-shadow:var(--shadow);
}
.card h3{margin:8px 0 8px; font-size:17px}
.card p{margin:0 0 14px; color:var(--muted); font-size:14.5px}
.card.link{display:block; transition:transform .18s, box-shadow .18s}
.card.link:hover{transform:translateY(-2px); box-shadow:0 10px 28px rgba(32,36,31,.09)}
.tag{display:inline-block; font-size:11.5px; letter-spacing:.08em; color:var(--accent);
  background:var(--accent-soft); padding:2px 9px; border-radius:999px}
.more{font-size:13.5px; color:var(--accent)}
.meta{list-style:none; padding:0; margin:0 0 14px; display:flex; flex-wrap:wrap; gap:8px}
.meta li{font-size:12.5px; color:var(--muted); border:1px solid var(--line); border-radius:999px; padding:1px 9px}
.empty{color:var(--muted)}

/* article */
.article{padding:48px 20px 72px; max-width:760px}
.crumb{font-size:13px; color:var(--muted); margin:0 0 10px}
.article h1{font-size:clamp(24px,3.4vw,34px); margin:0 0 12px; line-height:1.35}
.details{display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:10px 18px; margin:26px 0 34px}
.details li{border:none; padding:0; font-size:14px; display:flex; gap:8px}
.details b{color:var(--ink); font-weight:600; min-width:48px}
.content{font-size:16.5px}
.content h2{font-size:20px; margin:34px 0 10px}
.content h3{font-size:17px; margin:26px 0 8px}
.content p{margin:0 0 16px}
.content ul,.content ol{padding-left:22px; margin:0 0 16px}
.content li{margin:6px 0}
.content blockquote{margin:20px 0; padding:12px 18px; border-left:3px solid var(--accent);
  background:var(--accent-soft); border-radius:0 8px 8px 0; color:#33403c}
.cta{margin-top:44px; padding:24px; border:1px solid var(--line); border-radius:var(--radius);
  background:var(--card); display:flex; align-items:center; justify-content:space-between; gap:16px; flex-wrap:wrap}
.cta p{margin:0; color:var(--muted)}

/* form */
.form{margin-top:28px; background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:26px; box-shadow:var(--shadow)}
.row{display:grid; grid-template-columns:repeat(2,1fr); gap:16px}
.form label{display:block; font-size:13.5px; color:var(--muted); margin-bottom:16px}
.form input,.form select,.form textarea{
  width:100%; margin-top:6px; padding:10px 12px; font:inherit; font-size:15px; color:var(--ink);
  background:#fdfcfa; border:1px solid var(--line); border-radius:9px; outline:none; transition:.15s;
}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--accent); background:#fff;
  box-shadow:0 0 0 3px rgba(15,107,92,.10)}
.form textarea{resize:vertical; min-height:120px}
.req{color:#c2410c}
.hp{position:absolute; left:-9999px; width:1px; height:1px; overflow:hidden}
.form-foot{display:flex; align-items:center; gap:16px; flex-wrap:wrap}
.form-foot p{margin:0}
.form-msg{margin:14px 0 0; font-size:14px; min-height:20px}
.form-msg.ok{color:var(--accent)}
.form-msg.err{color:#b91c1c}

/* footer */
.site-foot{border-top:1px solid var(--line); padding:30px 0; margin-top:40px; background:#f6f3ec}
.site-foot p{margin:0 0 4px; font-size:13.5px}

@media (max-width:860px){
  .grid.three{grid-template-columns:1fr}
  .row{grid-template-columns:1fr}
  .hero{padding:60px 0 52px}
  .details{grid-template-columns:1fr}
  .nav{gap:16px}
}

/* language switcher */
.head-right{display:flex;align-items:center;gap:18px}
.lang{display:flex;align-items:center;gap:10px;font-size:13px;padding-left:16px;border-left:1px solid var(--line)}
.lang a{color:var(--muted);transition:color .15s}
.lang a:hover{color:var(--accent)}
.lang .active{color:var(--accent);font-weight:600}

@media (max-width:860px){
  .head-inner{height:auto;padding:12px 0;flex-wrap:wrap;gap:10px}
  .head-right{width:100%;justify-content:space-between;flex-wrap:wrap;gap:10px}
  .lang{border-left:none;padding-left:0}
}

/* 导航下拉 */
.nav-item{position:relative}
.nav-item > a{display:inline-block;padding:18px 0;font-size:14.5px;color:var(--muted);transition:color .15s}
.nav-item > a:hover{color:var(--accent)}
.flyout{position:absolute;top:100%;left:50%;transform:translate(-50%,6px);min-width:336px;
  opacity:0;visibility:hidden;z-index:40;
  transition:opacity .16s ease,transform .16s ease,visibility .16s}
.nav-item:hover .flyout,.nav-item:focus-within .flyout{opacity:1;visibility:visible;transform:translate(-50%,0)}
.flyout-inner{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px;
  box-shadow:0 24px 48px rgba(31,36,32,.13)}
.fly-card{display:block;padding:10px 12px;border-radius:10px;transition:background .15s}
.fly-card:hover{background:var(--bg)}
.fly-card b{display:block;font-size:14.5px;color:var(--ink);margin-bottom:3px}
.fly-card span{display:block;font-size:12.5px;color:var(--muted);line-height:1.55}
.fly-all{display:block;margin-top:4px;padding:9px 12px;font-size:13px;color:var(--accent);border-top:1px solid var(--line)}

/* 通栏板块 */
.scene{padding:96px 0}
.scene-hero{padding:70px 0 58px;border-bottom:1px solid var(--line)}
.scene.has-bg{position:relative;overflow:hidden}
.scene-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0;opacity:.32}
.scene.has-bg .wrap{position:relative;z-index:1}

/* 首页照片头图 */
.hero-photo{position:relative;overflow:hidden;min-height:76vh;display:flex;align-items:center;
  background:#141A17;color:#F5F1E8}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.hero-photo::after{content:"";position:absolute;inset:0;z-index:1;
  background:
    linear-gradient(90deg,rgba(17,24,21,.74) 0%,rgba(17,24,21,.45) 42%,rgba(17,24,21,.05) 78%),
    linear-gradient(180deg,rgba(17,24,21,.08) 0%,rgba(17,24,21,.52) 100%)}
.hero-photo .wrap{position:relative;z-index:2}
.hero-photo .kicker{color:#F2C9A0}
.hero-photo h1{color:#FFFDF7}
.hero-photo .lede{color:rgba(245,241,232,.88)}
.hero-photo .btn{background:#F5F1E8;border-color:#F5F1E8;color:#1F2420}
.hero-photo .btn:hover{background:#fff;box-shadow:0 8px 22px rgba(0,0,0,.25)}
.hero-photo .btn.ghost{background:transparent;color:#F5F1E8;border-color:rgba(245,241,232,.55)}
.hero-photo .btn.ghost:hover{background:rgba(255,255,255,.10);box-shadow:none}
.scene h2{font-size:clamp(22px,3vw,30px);margin:0 0 10px;letter-spacing:-.01em}
.scene-sub{color:var(--muted);margin:0 0 26px;font-size:15px;max-width:660px}
.scene-map{background:#FFFFFF;border-bottom:1px solid var(--line)}
.scene-dark{background:#121815;color:#E7E2D6;border-bottom:1px solid #1E2823}
.scene-dark h2{color:#F5F1E8}
.scene-dark .scene-sub{color:#9AA69F}
.scene-actions{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}
.btn.on-dark{background:transparent;border-color:rgba(245,241,232,.42);color:#F5F1E8}
.btn.on-dark:hover{background:rgba(255,255,255,.08);box-shadow:none}

.about-hero h1{font-size:clamp(30px,5vw,46px);line-height:1.2;margin:0 0 16px;letter-spacing:-.01em}
.hero-lede{max-width:640px;color:var(--muted);font-size:16.5px}
.hero-lede p{margin:0}
.stats{list-style:none;display:flex;gap:44px;margin:34px 0 0;padding:0;flex-wrap:wrap}
.stats li{display:flex;flex-direction:column;gap:6px}
.stats b{font-size:34px;line-height:1;color:var(--accent);font-weight:600;letter-spacing:-.02em}
.stats span{font-size:12.5px;color:var(--muted);letter-spacing:.04em}

.subgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:24px}
.subcard{display:block;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;
  transition:transform .18s,box-shadow .18s}
.subcard:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(31,36,32,.09)}
.subcard .n{font-size:11px;letter-spacing:.18em;color:var(--warm)}
.subcard h3{margin:6px 0 6px;font-size:15.5px}
.subcard p{margin:0;color:var(--muted);font-size:13.5px;line-height:1.6}

.hw-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.hw{background:rgba(255,255,255,.035);border:1px solid rgba(255,255,255,.09);border-radius:16px;padding:22px;
  transition:background .2s,border-color .2s}
.hw:hover{background:rgba(255,255,255,.06);border-color:rgba(111,183,167,.35)}
.hw .n{font-size:11px;letter-spacing:.18em;color:#C97A3E}
.hw h3{margin:8px 0 12px;font-size:17px;color:#F5F1E8}
.hw ul{list-style:none;margin:0;padding:0}
.hw li{font-size:13.5px;color:#9AA69F;padding:7px 0;border-top:1px solid rgba(255,255,255,.07)}

.guide-quote{margin:0 0 24px;max-width:860px;font-size:clamp(19px,2.6vw,26px);line-height:1.6;letter-spacing:-.005em}
.guide-quote::before{content:"“";color:var(--warm);margin-right:2px}
.chips{display:flex;gap:10px;flex-wrap:wrap}
.chips span{border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:13.5px;color:var(--muted);background:var(--card)}

/* 地图（浅色） */
.hubmap{background:#F4F1E7;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 10px 30px rgba(31,36,32,.06)}
.hubmap svg{display:block;width:100%;height:auto}
.hubmap .arc{stroke-dasharray:5 9;animation:dash 16s linear infinite}
@keyframes dash{to{stroke-dashoffset:-140}}
.hubmap .pulse{transform-box:fill-box;transform-origin:center;animation:pulse 3.4s ease-out infinite}
.hubmap .cn-cities .city-node:nth-child(2) .pulse{animation-delay:.9s}
.hubmap .cn-cities .city-node:nth-child(3) .pulse{animation-delay:1.8s}
.hubmap .cn-cities .city-node:nth-child(4) .pulse{animation-delay:2.7s}
.hubmap .cn-cities text{font-size:14px;fill:#1F2420;letter-spacing:.06em;
  font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}
.hubmap .cn-inset text{font-size:9.5px;fill:#0F6B5C;letter-spacing:.08em;opacity:.85;
  font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}
@keyframes pulse{
  0%{transform:scale(.5);opacity:.55}
  70%{transform:scale(2.6);opacity:0}
  100%{opacity:0}
}

@media (max-width:900px){
  .flyout{display:none}
  .hw-grid,.subgrid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:620px){
  .hw-grid,.subgrid{grid-template-columns:1fr}
  .scene{padding:56px 0}
  .stats{gap:26px}
  .nav{flex-wrap:wrap;gap:4px 16px}
  .nav-item > a{padding:8px 0}
}