:root{
  --brown:#4a2f1d; --brown-light:#6b4327; --gold:#c8a24a; --gold-light:#f0d98c;
  --cream:#faf5ec; --paper:#fffdf8; --text:#3a2515; --muted:#8a6f55;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei",sans-serif;background:var(--cream);color:var(--text);line-height:1.7}
a{text-decoration:none;color:inherit}

/* ============ Navbar ============ */
.navbar{position:sticky;top:0;z-index:100;background:rgba(74,47,29,.96);color:#fff;box-shadow:0 2px 12px rgba(0,0,0,.2)}
.nav-inner{max-width:1200px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}
.brand{font-size:1.25rem;font-weight:700;letter-spacing:1px;color:var(--gold-light)}
.nav-links a{color:#e8d8c0;margin-left:16px;font-size:.9rem;transition:.2s;white-space:nowrap}
.nav-links a:hover,.nav-links a.active{color:var(--gold-light)}
.nav-sep{color:#8a6f55;margin-left:8px}
@media(max-width:900px){
  .nav-links a{margin-left:10px;font-size:.82rem}
  .nav-sep{display:none}
}

/* ============ Hero ============ */
.hero{position:relative;height:100vh;min-height:600px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;background:#2a1a0e}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(74,47,29,.72),rgba(40,20,10,.5))}
.hero-content{position:relative;z-index:2;text-align:center;color:#fff;padding:0 24px;max-width:780px;animation:fadeUp 1.2s ease both}
.kicker{font-size:.9rem;letter-spacing:6px;color:var(--gold-light);text-transform:uppercase;margin-bottom:12px}
.hero-content h1{font-size:clamp(2.6rem,7vw,5rem);letter-spacing:8px;text-shadow:0 4px 24px rgba(0,0,0,.55)}
.subtitle{font-size:clamp(1.05rem,2.2vw,1.5rem);color:var(--gold-light);margin:18px 0 26px;letter-spacing:4px}
.intro{font-size:1.05rem;line-height:2.1;color:#f3e9d8;margin-bottom:34px;text-shadow:0 2px 8px rgba(0,0,0,.4)}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero-btn{background:var(--gold);color:var(--brown);border:none;padding:15px 40px;font-size:1rem;border-radius:40px;cursor:pointer;font-weight:700;letter-spacing:1px;transition:.25s;box-shadow:0 6px 20px rgba(200,162,74,.4)}
.hero-btn:hover{background:var(--gold-light);transform:translateY(-3px)}
.hero-btn.ghost{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.7)}
.hero-btn.ghost:hover{background:rgba(255,255,255,.15);border-color:#fff}
.scroll-hint{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);font-size:1.8rem;color:#fff;animation:bob 1.8s infinite;cursor:pointer;z-index:3}
@keyframes bob{0%,100%{transform:translate(-50%,0);opacity:.7}50%{transform:translate(-50%,10px);opacity:1}}

/* ============ 总览视频区 ============ */
.intro-video{padding:70px 24px;max-width:1000px;margin:0 auto;text-align:center}
.video-frame{position:relative;border-radius:18px;overflow:hidden;box-shadow:0 18px 50px rgba(74,47,29,.25);border:4px solid #fff}
.video-frame video{width:100%;display:block;aspect-ratio:16/9;background:#2a1a0e}
.section-head{text-align:center;margin-bottom:44px}
.section-head h2{font-size:2.2rem;color:var(--brown);letter-spacing:3px}
.motto{color:var(--gold);font-size:1.05rem;margin-top:12px;letter-spacing:1px}
.hint{color:var(--muted);font-size:.9rem;margin-top:10px}

/* ============ 卡片网格 ============ */
.regions{padding:70px 24px;max-width:1200px;margin:0 auto}
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:26px}
.region-card{background:var(--paper);border-radius:16px;overflow:hidden;cursor:pointer;box-shadow:0 6px 22px rgba(74,47,29,.1);transition:.35s;border:1px solid #f0e4d0;animation:fadeUp .6s ease both}
.region-card:hover{transform:translateY(-10px);box-shadow:0 16px 40px rgba(74,47,29,.22)}
.region-card .thumb{width:100%;aspect-ratio:3/4;object-fit:cover;display:block;background:linear-gradient(135deg,#ddd,#bbb)}
.region-card .info{padding:18px}
.region-card .info h3{font-size:1.45rem;color:var(--brown);margin-bottom:4px}
.region-card .info .sub{color:var(--gold);font-size:.9rem;font-weight:600;margin-bottom:8px}
.region-card .info p{font-size:.88rem;color:var(--muted)}

/* ============ 详情页 ============ */
.detail{max-width:1200px;margin:0 auto;padding:30px 24px 90px}
.back-btn{background:none;border:1px solid var(--brown);color:var(--brown);padding:9px 22px;border-radius:30px;cursor:pointer;font-size:.92rem;margin-bottom:26px;transition:.2s}
.back-btn:hover{background:var(--brown);color:#fff}
.detail-loading{text-align:center;color:var(--muted);padding:60px}

/* ---- 顶部地区视频 ---- */
.region-video-frame{position:relative;border-radius:16px;overflow:hidden;box-shadow:0 14px 40px rgba(74,47,29,.2);margin-bottom:36px;animation:fadeUp .7s ease both}
.region-video-frame video{width:100%;display:block;aspect-ratio:16/9;object-fit:cover;background:#2a1a0e}
.region-video-frame .vlabel{position:absolute;top:16px;left:16px;background:rgba(74,47,29,.8);color:var(--gold-light);padding:6px 16px;border-radius:20px;font-size:.85rem;letter-spacing:1px}

/* ---- 环绕布局：图居中，文字卡分布在左右 ---- */
/* 地区切换器 */
.region-switcher{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:30px;animation:fadeUp .6s ease both}
.sw-btn{width:46px;height:46px;border-radius:50%;border:2px solid var(--gold);background:var(--paper);color:var(--brown);font-size:1.6rem;line-height:1;cursor:pointer;transition:.2s;box-shadow:0 4px 14px rgba(74,47,29,.12)}
.sw-btn:hover{background:var(--gold);color:#fff}
.sw-center{text-align:center;min-width:160px}
.sw-name{display:block;font-size:1.5rem;font-weight:700;color:var(--brown);letter-spacing:2px}
.sw-sub{display:block;font-size:.85rem;color:var(--gold);margin-top:2px}
.sw-select{display:none}

/* 视频增强：无视频时提示 */
.region-video-frame .noflow{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--gold-light);font-size:.95rem;background:linear-gradient(135deg,#3a2515,#2a1a0e);pointer-events:none}

/* 环绕区整体背景装饰，页面更饱满 */
.surround{display:grid;grid-template-columns:1fr 1.55fr 1fr;grid-template-rows:auto auto auto;gap:24px;position:relative;background:radial-gradient(circle at 50% 40%,rgba(240,217,140,.22),transparent 62%);border-radius:28px;padding:34px 20px;margin-bottom:50px}
.surround .col-left{grid-column:1;display:flex;flex-direction:column;gap:18px}
.surround .col-right{grid-column:3;display:flex;flex-direction:column;gap:18px}
.surround .center{grid-column:2;position:relative;text-align:center;animation:fadeUp .8s ease both}
.surround .center img{width:100%;max-width:440px;aspect-ratio:3/4;object-fit:cover;border-radius:18px;background:#eee;box-shadow:0 16px 46px rgba(74,47,29,.25);border:5px solid #fff}

/* 热点 */
.hotspot{position:absolute;width:36px;height:36px;border-radius:50%;background:var(--gold);color:#fff;border:none;font-size:1.3rem;cursor:pointer;box-shadow:0 0 0 0 rgba(200,162,74,.6);animation:pulse 1.8s infinite;transform:translate(-50%,-50%);display:flex;align-items:center;justify-content:center;transition:.2s}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(200,162,74,.55)}70%{box-shadow:0 0 0 16px rgba(200,162,74,0)}100%{box-shadow:0 0 0 0 rgba(200,162,74,0)}}
.hotspot:hover{background:var(--brown);transform:translate(-50%,-50%) scale(1.15)}

/* 部件卡片 */
.part-card{background:var(--paper);border:1px solid #f0e4d0;border-radius:14px;padding:18px 20px;cursor:pointer;transition:.28s;text-align:left;position:relative;overflow:hidden}
.part-card::before{content:'';position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--gold);transform:scaleY(0);transition:.25s;transform-origin:center}
.part-card:hover,.part-card.active{background:#fdf0d5;border-color:var(--gold);transform:translateX(6px);box-shadow:0 8px 22px rgba(200,162,74,.22)}
.part-card:hover::before,.part-card.active::before{transform:scaleY(1)}
.col-right .part-card:hover,.col-right .part-card.active{transform:translateX(-6px)}
.part-card h4{color:var(--brown);font-size:1.08rem;margin-bottom:4px}
.part-card p{font-size:.85rem;color:var(--muted)}
.part-card .ptag{display:inline-block;font-size:.7rem;background:var(--gold);color:#fff;padding:2px 9px;border-radius:10px;margin-bottom:7px;letter-spacing:1px}

/* 地区文字介绍 */
.region-intro{max-width:860px;margin:0 auto;text-align:center}
.region-intro .desc{color:var(--muted);font-size:1rem;line-height:2}

/* ============ 弹窗 ============ */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.65);z-index:200;display:flex;align-items:center;justify-content:center;padding:24px;animation:fadeIn .25s ease}
.modal[hidden]{display:none}
.modal-content{background:var(--paper);border-radius:18px;max-width:760px;width:100%;max-height:90vh;overflow-y:auto;position:relative;display:grid;grid-template-columns:1fr 1fr;gap:0;animation:fadeUp .35s ease}
.modal-media img{width:100%;height:100%;min-height:360px;object-fit:cover;display:block;background:#eee}
.modal-text{padding:32px}
.modal-tag{display:inline-block;font-size:.72rem;background:var(--gold);color:#fff;padding:2px 10px;border-radius:10px;margin-bottom:10px;letter-spacing:1px}
.modal-close{position:absolute;top:12px;right:16px;width:36px;height:36px;border-radius:50%;border:none;background:var(--brown);color:#fff;font-size:1.4rem;cursor:pointer;z-index:3}
.modal-text h3{color:var(--brown);font-size:1.55rem;margin-bottom:4px}
.modal-sub{color:var(--gold);font-weight:600;margin-bottom:16px}
.modal-desc p{margin-bottom:12px;color:var(--text)}
.modal-desc strong{color:var(--brown-light)}

/* ============ Footer ============ */
.footer{text-align:center;padding:34px 24px;color:var(--muted);font-size:.85rem;background:#f3e9d8}
.foot-note{font-size:.78rem;margin-top:6px;opacity:.8}

/* ============ 动画 ============ */
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.region-card:nth-child(1){animation-delay:.05s}.region-card:nth-child(2){animation-delay:.12s}
.region-card:nth-child(3){animation-delay:.19s}.region-card:nth-child(4){animation-delay:.26s}
.region-card:nth-child(5){animation-delay:.33s}

/* ============ 响应式 ============ */
@media(max-width:820px){
  .surround{grid-template-columns:1fr;grid-template-rows:auto}
  .surround .col-left,.surround .col-right,.surround .center{grid-column:1}
  .surround .center{order:-1}
  .surround .col-left .part-card,.surround .col-right .part-card{text-align:center}
  .modal-content{grid-template-columns:1fr}
  .modal-media img{min-height:220px}
  .hero-actions{flex-direction:column;align-items:center}
}