/* ============================================================
   秦岭三日 · 摩旅计划  —  Apple 风格液态玻璃主题
   ============================================================ */

:root{
  --bg:#0b0b0d;
  --bg-2:#101014;
  --fg:#f5f5f7;
  --fg-dim:#a1a1aa;
  --muted:#7c7c85;
  --brand:#0a84ff;
  --brand-2:#64d2ff;
  --accent:#30d158;
  --warn:#ff9f0a;
  --glass:rgba(255,255,255,.06);
  --glass-2:rgba(255,255,255,.10);
  --stroke:rgba(255,255,255,.12);
  --stroke-2:rgba(255,255,255,.20);
  --radius:22px;
  --radius-sm:14px;
  --shadow:0 20px 60px rgba(0,0,0,.5);
  --ease:cubic-bezier(.22,1,.36,1);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(1200px 700px at 15% -10%, rgba(10,132,255,.16), transparent 60%),
    radial-gradient(1000px 600px at 90% 10%, rgba(191,90,242,.12), transparent 60%),
    radial-gradient(900px 700px at 50% 110%, rgba(48,209,88,.10), transparent 60%),
    var(--bg);
  color:var(--fg);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro SC","SF Pro Display","PingFang SC","Microsoft YaHei",system-ui,"Segoe UI",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;
  letter-spacing:.01em;
}
img{display:block;max-width:100%}
button{font:inherit;color:inherit;cursor:pointer;background:none;border:none}
a{color:inherit;text-decoration:none}
b{font-weight:600}

/* ── 玻璃基类 ── */
.glass{
  background:var(--glass);
  border:1px solid var(--stroke);
  backdrop-filter:blur(22px) saturate(180%);
  -webkit-backdrop-filter:blur(22px) saturate(180%);
  border-radius:var(--radius);
}

/* ══ 导航 ══ */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:60;
  transition:background .4s var(--ease), border-color .4s var(--ease);
  border-bottom:1px solid transparent;
}
.nav.is-scrolled{
  background:rgba(11,11,13,.62);
  backdrop-filter:blur(24px) saturate(180%);
  -webkit-backdrop-filter:blur(24px) saturate(180%);
  border-bottom-color:var(--stroke);
}
.nav-inner{
  max-width:1180px;margin:0 auto;height:56px;padding:0 22px;
  display:flex;align-items:center;gap:28px;
}
.nav-logo{display:flex;align-items:center;gap:9px;font-weight:600;font-size:15px}
.logo-mark{
  width:16px;height:16px;border-radius:5px;
  background:linear-gradient(140deg,var(--brand),var(--brand-2));
  box-shadow:0 0 16px rgba(10,132,255,.7);
}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:13px;color:var(--fg-dim)}
.nav-links a{position:relative;transition:color .25s}
.nav-links a:hover{color:#fff}
.nav-links a::after{
  content:"";position:absolute;left:0;right:100%;bottom:-5px;height:1px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));transition:right .35s var(--ease);
}
.nav-links a:hover::after{right:0}
.btn-glass{
  font-size:13px;padding:8px 16px;border-radius:999px;
  background:var(--glass-2);border:1px solid var(--stroke-2);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  transition:transform .3s var(--ease), background .3s;
}
.btn-glass:hover{background:rgba(255,255,255,.18);transform:translateY(-1px)}

/* ══ HERO ══ */
.hero{
  min-height:100svh;position:relative;display:grid;place-items:center;
  padding:120px 22px 80px;overflow:hidden;
}
.hero-photo{
  position:absolute;inset:0;
  background:url("../img/hero-ride.jpg") center 40%/cover no-repeat;
  opacity:.42;
  mask-image:linear-gradient(180deg,rgba(0,0,0,.95),rgba(0,0,0,.35) 55%,transparent);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.95),rgba(0,0,0,.35) 55%,transparent);
}
.hero-bg{
  position:absolute;inset:-12%;
  background:
    radial-gradient(60% 55% at 30% 25%, rgba(10,132,255,.30), transparent 65%),
    radial-gradient(50% 45% at 75% 30%, rgba(191,90,242,.24), transparent 65%),
    radial-gradient(70% 60% at 50% 85%, rgba(48,209,88,.20), transparent 65%);
  filter:blur(30px);animation:drift 22s ease-in-out infinite alternate;
  mix-blend-mode:screen;
}
@keyframes drift{from{transform:translate3d(-2%,-1%,0) scale(1.02)}to{transform:translate3d(2%,2%,0) scale(1.08)}}
.hero-grain{
  position:absolute;inset:0;pointer-events:none;opacity:.35;
  background-image:radial-gradient(rgba(255,255,255,.10) 1px, transparent 1px);
  background-size:3px 3px;mix-blend-mode:overlay;
}
.hero-inner{position:relative;text-align:center;max-width:900px}
.kicker{
  font-size:13px;letter-spacing:.34em;text-transform:uppercase;
  color:var(--brand-2);margin:0 0 22px;
}
.hero-title{font-size:clamp(46px,10vw,104px);line-height:.98;margin:0;font-weight:700;letter-spacing:-.03em}
.hero-title .line{display:block}
.grad-text{
  background:linear-gradient(100deg,#fff 5%,var(--brand-2) 45%,var(--brand) 85%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{margin:26px auto 0;max-width:600px;color:var(--fg-dim);font-size:clamp(15px,2.1vw,18px);line-height:1.75}
.hero-actions{display:flex;gap:14px;justify-content:center;margin-top:36px;flex-wrap:wrap}
.btn-primary{
  padding:14px 30px;border-radius:999px;font-size:15px;font-weight:600;
  background:linear-gradient(140deg,var(--brand),#0a63d0);
  box-shadow:0 14px 40px rgba(10,132,255,.42);
  transition:transform .3s var(--ease), box-shadow .3s;
}
.btn-primary:hover{transform:translateY(-2px) scale(1.02);box-shadow:0 20px 50px rgba(10,132,255,.55)}
.btn-primary .arrow{display:inline-block;transition:transform .35s var(--ease)}
.btn-primary:hover .arrow{transform:translateY(4px)}
.btn-ghost{
  padding:14px 28px;border-radius:999px;font-size:15px;
  background:var(--glass);border:1px solid var(--stroke-2);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  transition:background .3s, transform .3s var(--ease);
}
.btn-ghost:hover{background:rgba(255,255,255,.16);transform:translateY(-2px)}

.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;
  margin-top:64px;padding:26px 8px;border-top:1px solid var(--stroke);
}
.stat{position:relative;padding-left:20px}
.stat:first-child{padding-left:0}
.stat:not(:first-child)::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;width:1px;background:var(--stroke);
}
.stat b{display:block;font-size:clamp(24px,4vw,40px);font-weight:700;letter-spacing:-.02em}
.stat span{font-size:12.5px;color:var(--muted)}
.scroll-cue{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);opacity:.85}
.scroll-cue span{
  display:block;width:22px;height:36px;border:1.5px solid var(--stroke-2);border-radius:12px;position:relative;
}
.scroll-cue span::after{
  content:"";position:absolute;left:50%;top:7px;width:3px;height:7px;border-radius:2px;
  background:var(--brand-2);transform:translateX(-50%);animation:cue 1.8s infinite;
}
@keyframes cue{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}100%{opacity:0;transform:translate(-50%,12px)}}

/* ══ 通用 section ══ */
.section{padding:110px 22px}
.wrap{max-width:1180px;margin:0 auto}
.eyebrow{
  font-size:12px;letter-spacing:.28em;text-transform:uppercase;color:var(--brand-2);margin:0 0 16px;
}
.h2{font-size:clamp(30px,5.4vw,54px);line-height:1.12;letter-spacing:-.025em;margin:0 0 20px;font-weight:700}
.muted{color:var(--muted);font-weight:500}

/* ── 入场动画 ── */
.reveal-up{opacity:0;transform:translateY(28px);transition:opacity .9s var(--ease), transform .9s var(--ease)}
.reveal-up.is-in{opacity:1;transform:none}

/* ══ Day 标签 ══ */
.day-tabs{display:flex;gap:10px;flex-wrap:wrap;margin:34px 0 30px}
.tab{
  padding:9px 20px;border-radius:999px;font-size:13.5px;color:var(--fg-dim);
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  transition:all .3s var(--ease);
}
.tab:hover{color:#fff;border-color:var(--stroke-2)}
.tab.is-active{
  color:#fff;background:linear-gradient(140deg,rgba(10,132,255,.9),rgba(10,99,208,.9));
  border-color:transparent;box-shadow:0 10px 30px rgba(10,132,255,.35);
}

/* ══ 路线卡片 ══ */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:22px}
.card{
  position:relative;border-radius:var(--radius);overflow:hidden;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(22px) saturate(170%);-webkit-backdrop-filter:blur(22px) saturate(170%);
  transition:transform .5s var(--ease), border-color .4s, box-shadow .5s;
  opacity:0;transform:translateY(26px);
}
.card.is-in{opacity:1;transform:none}
.card:hover{transform:translateY(-8px);border-color:var(--stroke-2);box-shadow:var(--shadow)}
.card-media{position:relative;aspect-ratio:16/10;overflow:hidden;background:#15151a}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .9s var(--ease)}
.card:hover .card-media img{transform:scale(1.07)}
.card-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 35%,rgba(11,11,13,.85));
}
.card-badges{position:absolute;top:14px;left:14px;display:flex;gap:8px;z-index:2}
.badge{
  font-size:11.5px;padding:5px 11px;border-radius:999px;font-weight:600;
  background:rgba(0,0,0,.42);border:1px solid var(--stroke-2);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
}
.badge.day{background:linear-gradient(140deg,rgba(10,132,255,.9),rgba(10,99,208,.9));border-color:transparent}
.badge.alt{background:linear-gradient(140deg,rgba(191,90,242,.85),rgba(150,60,200,.85));border-color:transparent}
.card-body{padding:20px 20px 22px}
.card-title{font-size:20px;font-weight:650;margin:0 0 6px;letter-spacing:-.01em}
.card-sub{font-size:13px;color:var(--muted);margin:0 0 16px}
.card-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:16px}
.metric{background:rgba(255,255,255,.05);border:1px solid var(--stroke);border-radius:var(--radius-sm);padding:10px 12px}
.metric b{display:block;font-size:16px}
.metric span{font-size:11px;color:var(--muted)}
.chips{display:flex;gap:7px;flex-wrap:wrap}
.chip{font-size:11.5px;color:var(--fg-dim);padding:4px 10px;border-radius:999px;background:rgba(255,255,255,.05);border:1px solid var(--stroke)}

/* ══ 3D 地图 ══ */
.map-section{padding-bottom:40px}
.map-stage{
  height:200vh;position:relative;
}
.map-3d{
  position:sticky;top:0;height:100vh;display:grid;place-items:center;
  perspective:1100px;
}
.map-3d .map-svg{
  width:min(1240px,94vw);height:auto;transform-origin:50% 62%;
  transform:rotateX(64deg) scale(1.02);
  transition:transform .15s linear;
  filter:drop-shadow(0 44px 70px rgba(10,132,255,.30));
  border-radius:18px;
}
.route-line{
  stroke-dasharray:2400;stroke-dashoffset:2400;
  transition:stroke-dashoffset .2s linear;
}
.pins circle{fill:#fff;filter:drop-shadow(0 0 10px rgba(100,210,255,.95))}
.pins .pulse{fill:none;stroke:rgba(120,210,255,.85);stroke-width:2;transform-origin:center}
.pins text{fill:#fff;font-size:18px;font-weight:700;letter-spacing:.02em;paint-order:stroke;stroke:rgba(0,0,0,.55);stroke-width:4px}
@keyframes pinPulse{0%{r:10;opacity:.9}70%{r:26;opacity:0}100%{r:26;opacity:0}}
.pin-g{opacity:0;transform:translateY(-14px) scale(.4);transition:opacity .6s var(--ease), transform .6s var(--ease)}
.pin-g.is-on{opacity:1;transform:translateY(0) scale(1)}
.pin-g.is-on .pulse{animation:pinPulse 2.4s ease-out infinite}
.map-legend{
  position:absolute;left:50%;bottom:9vh;transform:translateX(-50%);
  display:flex;gap:10px;padding:8px;border-radius:999px;
  background:rgba(11,11,13,.55);border:1px solid var(--stroke-2);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  max-width:92vw;overflow-x:auto;
}
.legend-btn{
  white-space:nowrap;font-size:12.5px;padding:8px 15px;border-radius:999px;color:var(--fg-dim);
  transition:all .3s var(--ease);
}
.legend-btn:hover{color:#fff;background:rgba(255,255,255,.09)}
.legend-btn.is-active{color:#fff;background:rgba(10,132,255,.35);border:1px solid rgba(10,132,255,.6)}
.map-caption{
  position:absolute;left:50%;top:9vh;transform:translateX(-50%);
  font-size:13px;letter-spacing:.16em;color:var(--fg-dim);text-transform:uppercase;white-space:nowrap;
}

/* ══ 详细行程 ══ */
.detail-list{display:flex;flex-direction:column;gap:22px;margin-top:8px}
.detail{
  border-radius:var(--radius);overflow:hidden;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px);
  transition:border-color .4s, box-shadow .4s;
}
.detail:hover{border-color:var(--stroke-2);box-shadow:var(--shadow)}
.detail-head{
  display:flex;align-items:center;gap:18px;padding:22px 24px;cursor:pointer;
  transition:background .3s;
}
.detail-head:hover{background:rgba(255,255,255,.03)}
.detail-thumb{
  width:76px;height:76px;border-radius:16px;overflow:hidden;flex:0 0 76px;
  border:1px solid var(--stroke);background:#15151a;
}
.detail-thumb img{width:100%;height:100%;object-fit:cover}
.detail-meta{flex:1;min-width:0}
.detail-name{font-size:18px;font-weight:650;margin:0 0 4px}
.detail-line{font-size:12.8px;color:var(--muted)}
.detail-caret{
  width:34px;height:34px;flex:0 0 34px;border-radius:50%;display:grid;place-items:center;
  background:rgba(255,255,255,.06);border:1px solid var(--stroke);
  transition:transform .45s var(--ease), background .3s;
}
.detail.is-open .detail-caret{transform:rotate(180deg);background:rgba(10,132,255,.3)}
.detail-body{
  max-height:0;overflow:hidden;transition:max-height .6s var(--ease);
}
.detail-inner{padding:0 24px 26px}
.detail-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:26px}
.detail-photo{border-radius:16px;overflow:hidden;border:1px solid var(--stroke);cursor:zoom-in}
.detail-photo img{width:100%;aspect-ratio:16/10;object-fit:cover}
.spec{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 0 18px}
.spec div{background:rgba(255,255,255,.05);border:1px solid var(--stroke);border-radius:12px;padding:10px 13px}
.spec span{font-size:11px;color:var(--muted);display:block}
.spec b{font-size:15px}
.sub-h{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--brand-2);margin:20px 0 10px}
.tick{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:9px}
.tick li{position:relative;padding-left:24px;font-size:14px;color:var(--fg-dim);line-height:1.6}
.tick li::before{
  content:"";position:absolute;left:6px;top:8px;width:6px;height:6px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 10px rgba(48,209,88,.8);
}
.warn-li::before{background:var(--warn)!important;box-shadow:0 0 10px rgba(255,159,10,.8)!important}
.wx-row{display:flex;gap:9px;margin-top:12px;flex-wrap:wrap}
.wx{flex:1;min-width:88px;background:rgba(255,255,255,.05);border:1px solid var(--stroke);border-radius:12px;padding:9px 11px}
.wx b{display:block;font-size:13.5px}
.wx small{color:var(--muted);font-size:11px}

/* ══ 装备网格 ══ */
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-top:12px}
.glass-card{
  padding:26px 24px;border-radius:var(--radius);
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(22px) saturate(170%);-webkit-backdrop-filter:blur(22px) saturate(170%);
  transition:transform .5s var(--ease), border-color .4s;
}
.glass-card:hover{transform:translateY(-6px);border-color:var(--stroke-2)}
.glass-card .ic{font-size:26px;margin-bottom:12px}
.glass-card h3{margin:0 0 14px;font-size:17px}
.glass-card .tick li{font-size:13.5px}

/* ══ 出发带 ══ */
.depart{position:relative;overflow:hidden;padding:120px 22px;margin:20px 0}
.depart-photo{
  position:absolute;inset:0;
  background:url("../img/photo-xian.jpg") center 45%/cover no-repeat;
  opacity:.30;
  mask-image:linear-gradient(90deg,transparent,#000 35%,#000 65%,transparent);
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 35%,#000 65%,transparent);
}
.depart::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,var(--bg),rgba(11,11,13,.35) 45%,var(--bg));
  pointer-events:none;
}
.depart-inner{position:relative;z-index:2}
.depart-note{margin:18px 0 0;max-width:640px;color:var(--fg-dim);font-size:15px;line-height:1.8}

/* ══ Footer ══ */
.footer{padding:80px 22px 60px;border-top:1px solid var(--stroke);margin-top:40px}
.foot-title{font-size:16px;font-weight:600;margin:0 0 14px}
.foot-note{color:var(--muted);font-size:13px;line-height:1.8;max-width:760px;margin:0 0 16px}
.foot-dim{color:#48484f;font-size:12px;margin:0}

/* ══ 灯箱 ══ */
.lightbox{
  position:fixed;inset:0;z-index:100;display:none;place-items:center;
  background:rgba(0,0,0,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  padding:40px;
}
.lightbox.is-open{display:grid;animation:fade .35s var(--ease)}
@keyframes fade{from{opacity:0}to{opacity:1}}
.lightbox img{max-width:92vw;max-height:86vh;border-radius:16px;border:1px solid var(--stroke-2);box-shadow:0 30px 80px rgba(0,0,0,.7)}
.lb-close{
  position:absolute;top:24px;right:26px;width:40px;height:40px;border-radius:50%;
  background:var(--glass-2);border:1px solid var(--stroke-2);font-size:15px;
}

/* ══ 响应式 ══ */
@media(max-width:900px){
  .nav-links{display:none}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:20px}
  .detail-grid{grid-template-columns:1fr}
  .map-stage{height:180vh}
}
@media(max-width:520px){
  .section{padding:78px 18px}
  .spec{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition-duration:.01ms!important}
  .reveal-up{opacity:1;transform:none}
}