/* ============ 基础 ============ */
:root{
  --paper:#f7f2e8;
  --paper-deep:#efe7d6;
  --ink:#2b2620;
  --ink-soft:#6b6257;
  --bj:#b13a2a;          /* 北京 · 朱红 */
  --xa:#b07d2b;          /* 西安 · 唐金 */
  --sh:#1f6e8c;          /* 上海 · 海蓝 */
  --line:#d9cdb8;
  --night:#0d1424;
  --serif:'Noto Serif SC', 'Songti SC', serif;
  --sans:'Noto Sans SC', 'PingFang SC', sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;letter-spacing:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--paper);color:var(--ink);line-height:1.7}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3{font-family:var(--serif)}

/* ============ 顶部导航 ============ */
.topnav{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;gap:16px;
  padding:10px 22px;background:rgba(13,20,36,.55);backdrop-filter:blur(10px);
  transition:background .3s;color:#f4efe4}
.topnav.solid{background:rgba(247,242,232,.92);color:var(--ink);box-shadow:0 1px 0 rgba(0,0,0,.08)}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:700;font-size:17px}
.brand-seal{display:grid;place-items:center;width:30px;height:30px;background:var(--bj);color:#fff;
  border-radius:6px;font-size:16px;font-weight:900}
.nav-days{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.nav-days a{padding:5px 11px;border-radius:999px;font-size:13px;opacity:.85;border:1px solid transparent}
.nav-days a:hover{opacity:1;border-color:currentColor}
.nav-days a.active{background:var(--bj);color:#fff;opacity:1}
.nav-days a.active.c-xa{background:var(--xa)}
.nav-days a.active.c-sh{background:var(--sh)}
.nav-toggle{display:none;margin-left:auto;background:none;border:none;color:inherit;font-size:22px;cursor:pointer}

/* ============ Hero ============ */
.hero{position:relative;height:100vh;min-height:620px;background:var(--night);overflow:hidden}
#heroCanvas{position:absolute;inset:0;width:100%;height:100%}
.hero-vignette{position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse at 50% 42%,transparent 40%,rgba(13,20,36,.55) 100%),
             linear-gradient(to bottom,rgba(13,20,36,.35),transparent 30%,transparent 62%,rgba(13,20,36,.82));}
.hero-content{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;
  text-align:center;color:#f4efe4;padding:0 20px;pointer-events:none}
.hero-content a{pointer-events:auto}
.hero-kicker{font-size:13px;letter-spacing:.5em;text-indent:.5em;opacity:.75;margin-bottom:18px}
.hero-title{font-size:clamp(38px,7vw,84px);font-weight:900;line-height:1.15;
  text-shadow:0 4px 30px rgba(0,0,0,.5)}
.hero-route{margin-top:18px;font-family:var(--serif);font-size:clamp(18px,2.6vw,26px);font-weight:600}
.hero-route .route-arrow{margin:0 14px;opacity:.6}
.city-bj{color:#ff8d7a}.city-xa{color:#ffc966}.city-sh{color:#7fd4f0}
.hero-sub{margin-top:16px;font-size:15px;opacity:.85;font-weight:300}
.hero-cta{margin-top:34px;padding:12px 34px;border:1px solid rgba(244,239,228,.55);border-radius:999px;
  font-size:15px;transition:.25s;background:rgba(244,239,228,.06)}
.hero-cta:hover{background:#f4efe4;color:var(--night)}
.hero-hint{position:absolute;bottom:18px;right:22px;font-size:12px;color:rgba(244,239,228,.5)}

/* ============ 章节标题 ============ */
main{overflow-x:hidden}
.section-head{text-align:center;padding:72px 20px 34px}
.section-en{font-size:12px;letter-spacing:.45em;text-indent:.45em;color:var(--ink-soft);margin-bottom:8px}
.section-head h2{font-size:clamp(26px,4vw,40px);font-weight:900}
.section-head h2::after{content:"";display:block;width:56px;height:3px;background:var(--bj);margin:14px auto 0;border-radius:2px}

/* ============ 行程总览 ============ */
.route-cards{display:flex;align-items:stretch;justify-content:center;gap:14px;max-width:1080px;margin:0 auto;padding:0 20px;flex-wrap:wrap}
.route-card{flex:1 1 240px;max-width:300px;background:#fffdf7;border:1px solid var(--line);border-radius:8px;
  padding:26px 24px;position:relative;box-shadow:0 8px 24px rgba(43,38,32,.07)}
.route-card::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;border-radius:8px 8px 0 0}
.rc-bj::before{background:var(--bj)}.rc-xa::before{background:var(--xa)}.rc-sh::before{background:var(--sh)}
.rc-days{font-size:12px;letter-spacing:.2em;color:var(--ink-soft)}
.route-card h3{font-size:30px;font-weight:900;margin:6px 0 0}
.rc-en{font-size:12px;letter-spacing:.3em;color:var(--ink-soft);margin-bottom:10px}
.route-card p:last-child{font-size:14px;color:var(--ink-soft)}
.route-link{align-self:center;text-align:center;font-size:12px;color:var(--ink-soft);line-height:1.5;
  padding:8px 10px;border:1px dashed var(--line);border-radius:8px;background:var(--paper-deep)}
.date-setter{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;
  margin:34px auto 0;padding:0 20px;font-size:14px;color:var(--ink-soft)}
.date-setter input{padding:8px 12px;border:1px solid var(--line);border-radius:6px;background:#fffdf7;
  font-family:var(--sans);font-size:14px;color:var(--ink)}
.btn-ghost{padding:8px 14px;border:1px solid var(--line);border-radius:6px;background:none;cursor:pointer;
  font-size:13px;color:var(--ink-soft)}
.btn-ghost:hover{background:var(--paper-deep)}

/* ============ 每日图册页 ============ */
.day{padding:84px 0 60px;position:relative}
.day:nth-child(even){background:var(--paper-deep)}
.day-inner{max-width:1120px;margin:0 auto;padding:0 22px}
.day-head{display:flex;align-items:flex-end;gap:22px;flex-wrap:wrap;margin-bottom:8px}
.day-num{font-family:var(--serif);font-weight:900;font-size:clamp(64px,9vw,110px);line-height:.9;
  color:transparent;-webkit-text-stroke:2px var(--ink);opacity:.28}
.day-meta{padding-bottom:8px}
.day-city-badge{display:inline-block;padding:3px 14px;border-radius:999px;color:#fff;font-size:13px;
  letter-spacing:.15em;margin-bottom:10px}
.b-bj{background:var(--bj)}.b-xa{background:var(--xa)}.b-sh{background:var(--sh)}
.day-title{font-size:clamp(24px,3.6vw,38px);font-weight:900;line-height:1.3}
.day-date{margin-top:6px;font-size:14px;color:var(--ink-soft)}
.day-date strong{color:var(--bj);font-weight:700}
.day-area{margin:4px 0 26px;font-size:14px;color:var(--ink-soft)}
.day-area b{color:var(--ink)}

.day-body{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:40px;align-items:start}
.day:nth-of-type(even) .day-body{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.day:nth-of-type(even) .day-photos{order:2}
.day:nth-of-type(even) .day-plan{order:1}

/* 相片拼贴 */
.day-photos{display:grid;grid-template-columns:repeat(2,1fr);gap:26px 22px;padding-top:8px}
.photo{background:#fffdf7;border:1px solid #e7dcc6;padding:10px 10px 12px;border-radius:3px;
  box-shadow:0 10px 26px rgba(43,38,32,.14);cursor:zoom-in;position:relative;
  transition:transform .35s cubic-bezier(.2,.8,.3,1.2),box-shadow .3s}
.photo:nth-child(4n+1){transform:rotate(-1.8deg)}
.photo:nth-child(4n+2){transform:rotate(1.4deg) translateY(14px)}
.photo:nth-child(4n+3){transform:rotate(1.1deg)}
.photo:nth-child(4n){transform:rotate(-1.2deg) translateY(10px)}
.photo:hover{transform:rotate(0) scale(1.04);box-shadow:0 18px 44px rgba(43,38,32,.24);z-index:2}
.photo::before{content:"";position:absolute;top:-11px;left:50%;transform:translateX(-50%) rotate(-2deg);
  width:82px;height:22px;background:rgba(219,199,158,.65);border-left:1px dashed rgba(255,255,255,.5);
  border-right:1px dashed rgba(255,255,255,.5)}
.photo img{width:100%;aspect-ratio:4/3;object-fit:cover}
.photo.tall img{aspect-ratio:3/3.6}
.photo figcaption{font-size:13px;padding:9px 2px 0;color:var(--ink);font-family:var(--serif)}
.photo .credit{display:block;font-size:11px;color:#a89b87;font-family:var(--sans)}
.photo.wide{grid-column:span 2}
.photo.wide img{aspect-ratio:16/8}

/* 行程时间轴 */
.day-plan{background:#fffdf7;border:1px solid var(--line);border-radius:8px;padding:26px 26px 20px;
  box-shadow:0 8px 24px rgba(43,38,32,.07)}
.plan-title{font-family:var(--serif);font-weight:700;font-size:16px;letter-spacing:.15em;
  color:var(--ink-soft);margin-bottom:16px;display:flex;align-items:center;gap:8px}
.plan-title::after{content:"";flex:1;height:1px;background:var(--line)}
.timeline{list-style:none}
.timeline li{position:relative;padding:0 0 18px 26px;font-size:14.5px}
.timeline li::before{content:"";position:absolute;left:6px;top:9px;width:9px;height:9px;border-radius:50%;
  background:var(--paper);border:2.5px solid var(--bj)}
.timeline li::after{content:"";position:absolute;left:10px;top:22px;bottom:-2px;width:1.5px;background:var(--line)}
.timeline li:last-child::after{display:none}
.timeline .t-label{font-weight:700;font-family:var(--serif);margin-right:6px}
.timeline .t-sub{display:block;font-size:13px;color:var(--ink-soft);margin-top:2px}
.day.city-xa .timeline li::before{border-color:var(--xa)}
.day.city-sh .timeline li::before{border-color:var(--sh)}

.dinner{margin-top:18px;border-radius:8px;padding:16px 18px;background:linear-gradient(135deg,#fdf6ea,#f8ecd8);
  border:1px solid #ecd9b4}
.dinner h5{font-family:var(--serif);font-size:15px;margin-bottom:6px}
.dinner p{font-size:13.5px;color:var(--ink-soft)}
.dinner .tag{display:inline-block;margin:6px 6px 0 0;padding:2px 10px;font-size:12px;border-radius:999px;
  background:#fff;border:1px solid #e4cfa4;color:#8a6a2f}

.bonus{margin-top:14px;font-size:13.5px;color:var(--ink-soft);padding:12px 16px;border-left:3px solid var(--line);
  background:rgba(255,253,247,.6);border-radius:0 6px 6px 0}
.bonus b{color:var(--ink)}

.notes{margin-top:14px;border-radius:8px;padding:14px 18px;background:#fdeeea;border:1px solid #f0c9bf;font-size:13.5px}
.notes h5{font-family:var(--serif);font-size:14px;color:var(--bj);margin-bottom:6px}
.notes ul{list-style:none}
.notes li{padding-left:18px;position:relative;margin-bottom:4px}
.notes li::before{content:"✓";position:absolute;left:0;color:var(--bj);font-weight:700}

/* 进场动画 */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ============ 行前锦囊 ============ */
.tips{background:var(--night);color:#e9e3d5;padding-bottom:80px}
.tips .section-en{color:#8d97ad}
.tips .section-head h2{color:#f4efe4}
.tips .section-head h2::after{background:var(--xa)}
.tips-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;
  max-width:1080px;margin:0 auto;padding:0 22px}
.tip-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:8px;padding:22px}
.tip-ico{font-size:26px}
.tip-card h4{font-family:var(--serif);margin:10px 0 6px;font-size:17px;color:#fff}
.tip-card p{font-size:13.5px;color:#aab2c2}

/* ============ 页脚 ============ */
.footer{background:#090e1a;color:#7d8698;text-align:center;padding:44px 20px;font-size:13px}
.footer-seal{width:44px;height:44px;margin:0 auto 14px;display:grid;place-items:center;background:var(--bj);
  color:#fff;border-radius:8px;font-family:var(--serif);font-size:22px;font-weight:900}
.footer-note{margin-top:8px;font-size:12px;opacity:.6}

/* ============ Lightbox ============ */
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(9,12,20,.92);display:none;
  flex-direction:column;align-items:center;justify-content:center;padding:30px}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:80vh;border-radius:4px;box-shadow:0 20px 80px rgba(0,0,0,.6)}
.lb-caption{color:#d9d2c2;margin-top:16px;font-size:14px;font-family:var(--serif);text-align:center}
.lb-close{position:absolute;top:16px;right:24px;background:none;border:none;color:#fff;font-size:40px;
  cursor:pointer;line-height:1;opacity:.7}
.lb-close:hover{opacity:1}

/* ============ 响应式 ============ */
@media (max-width: 900px){
  .day-body{grid-template-columns:1fr !important}
  .day-photos{order:1 !important}
  .day-plan{order:2 !important}
}
@media (max-width: 640px){
  .nav-days{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;
    background:rgba(13,20,36,.96);padding:12px 22px;gap:2px}
  .topnav.solid .nav-days{background:rgba(247,242,232,.98)}
  .nav-days.open{display:flex}
  .nav-toggle{display:block}
  .day-photos{grid-template-columns:1fr;gap:30px}
  .photo.wide{grid-column:span 1}
  .photo:nth-child(n){transform:rotate(-1deg) translateY(0)}
  .route-link{width:100%;border:none;background:none;padding:0}
  .hero-hint{display:none}
}