/* ================================================================
   JIUZHAIGOU.ONLINE — 设计系统 v2.0
   主题：翠海 · 叠瀑 · 彩林 · 雪峰 · 藏情
   ================================================================ */
@font-face{font-family:'Playfair Display';font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/playfair-regular.woff2) format('woff2')}
@font-face{font-family:'Playfair Display';font-style:italic;font-weight:400;font-display:swap;src:url(../fonts/playfair-italic.woff2) format('woff2')}

/* ==================== DESIGN TOKENS ==================== */
:root{
  /* 品牌色板 — 源自九寨沟翠湖 */
  --b50:#f0fdfa;--b100:#ccfbf1;--b200:#99f6e4;--b300:#5eead4;
  --b400:#2dd4bf;--b500:#14b8a6;--b600:#0d9488;--b700:#0f766e;
  --b800:#115e59;--b900:#134e4a;--b950:#042f2e;
  /* 秋韵金 */
  --g400:#fbbf24;--g500:#f59e0b;--g600:#d97706;--g300:#fcd34d;
  /* 雪峰 */
  --s0:#ffffff;--s50:#f8fffe;--s100:#f0f5f4;--s200:#e2e8e7;
  /* 湖蓝 */
  --l400:#22d3ee;--l600:#0891b2;
  /* 文字 */
  --ink:#042f2e;--ink-soft:rgba(4,47,46,.66);--ink-faint:rgba(4,47,46,.42);
  --on-dark:#ffffff;--on-dark-soft:rgba(255,255,255,.62);--on-dark-faint:rgba(255,255,255,.38);
  /* 字体 */
  --serif:"STSong","SimSun","Songti SC","Noto Serif CJK SC",serif;
  --sans:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Noto Sans CJK SC",system-ui,sans-serif;
  --en:'Playfair Display','Georgia','Times New Roman',serif;
  /* 几何 */
  --r-sm:10px;--r:16px;--r-lg:24px;--r-xl:32px;
  --shadow-sm:0 2px 12px rgba(4,47,46,.06);
  --shadow:0 12px 40px rgba(4,47,46,.10);
  --shadow-lg:0 24px 80px rgba(4,47,46,.16);
  --shadow-brand:0 10px 30px rgba(13,148,136,.25);
  --t-fast:.25s ease;--t:.4s cubic-bezier(.25,.46,.45,.94);--t-slow:.7s ease;
  --nav-h:76px;
  --maxw:1240px;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px)}
body{font-family:var(--sans);background:var(--s50);color:var(--ink);overflow-x:hidden;line-height:1.75;-webkit-font-smoothing:antialiased;font-size:15px}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit;transition:var(--t-fast)}
button{font-family:inherit;cursor:pointer;border:none;background:none}
ul,ol{list-style:none}
svg{display:inline-block}
::selection{background:var(--b600);color:#fff}

/* Scrollbar */
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-track{background:var(--b950)}
::-webkit-scrollbar-thumb{background:linear-gradient(var(--b500),var(--b700));border-radius:5px}
::-webkit-scrollbar-thumb:hover{background:var(--b400)}

/* ==================== TYPOGRAPHY ==================== */
h1,h2,h3,h4,h5{font-family:var(--serif);line-height:1.3;font-weight:700}
.serif{font-family:var(--serif)}
.en{font-family:var(--en)}
.kicker{display:inline-flex;align-items:center;gap:10px;font-size:11px;letter-spacing:.4em;text-transform:uppercase;color:var(--b600);font-weight:600}
.kicker::before,.kicker::after{content:'';width:28px;height:1px;background:currentColor;opacity:.4}
.kicker.on-dark{color:var(--b300)}
.display{font-size:clamp(2.4rem,5.6vw,4.6rem);letter-spacing:.06em;line-height:1.15}
.display-2{font-size:clamp(1.7rem,3.2vw,2.6rem)}
.lead{font-size:clamp(1rem,1.4vw,1.15rem);line-height:1.9}

/* ==================== LAYOUT ==================== */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(18px,4vw,32px)}
.section{padding:clamp(72px,9vw,128px) 0;position:relative}
.section-tight{padding:clamp(48px,6vw,80px) 0}
.bg-deep{background:var(--b950);color:var(--on-dark)}
.bg-white{background:#fff}
.bg-mist{background:linear-gradient(180deg,var(--s50),var(--b50))}
.section-head{max-width:680px;margin:0 auto clamp(40px,6vw,64px);text-align:center}
.section-head h2{margin:14px 0 12px}
.section-head p{color:var(--ink-soft)}

/* ==================== BUTTONS ==================== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:13px 32px;border-radius:999px;font-size:14px;font-weight:600;letter-spacing:.04em;transition:var(--t);white-space:nowrap}
.btn svg{width:16px;height:16px;transition:transform var(--t-fast)}
.btn-primary{background:linear-gradient(135deg,var(--b500),var(--b600));color:#fff;box-shadow:var(--shadow-brand)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(13,148,136,.35)}
.btn-primary:hover svg{transform:translateX(3px)}
.btn-gold{background:linear-gradient(135deg,var(--g400),var(--g600));color:#fff;box-shadow:0 10px 30px rgba(245,158,11,.3)}
.btn-gold:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(245,158,11,.4)}
.btn-ghost{background:transparent;border:1.5px solid rgba(255,255,255,.35);color:#fff;backdrop-filter:blur(8px)}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-outline{background:transparent;border:1.5px solid var(--b500);color:var(--b600)}
.btn-outline:hover{background:var(--b600);color:#fff}
.btn-dark{background:var(--b950);color:#fff}
.btn-dark:hover{background:var(--b900);transform:translateY(-3px)}
.btn-lg{padding:16px 42px;font-size:15px}
.btn-sm{padding:9px 20px;font-size:13px}

/* ==================== HEADER / NAV ==================== */
.header{position:fixed;top:0;left:0;right:0;z-index:900;transition:var(--t);padding:0 clamp(16px,4vw,36px)}
.header .wrap{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.header.scrolled{background:rgba(4,47,46,.92);backdrop-filter:blur(20px) saturate(1.5);-webkit-backdrop-filter:blur(20px) saturate(1.5);box-shadow:0 1px 30px rgba(0,0,0,.25)}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand-mark{width:42px;height:42px;border-radius:50%;background:conic-gradient(from 210deg,var(--b300),var(--b600),var(--b950),var(--b300));display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0;box-shadow:0 0 0 3px rgba(255,255,255,.15)}
.brand-mark svg{width:20px;height:20px}
.brand-name{font-family:var(--serif);font-size:21px;font-weight:700;letter-spacing:.18em;line-height:1.1}
.brand-en{display:block;font-family:var(--en);font-size:8.5px;letter-spacing:.34em;opacity:.55;font-weight:400}
.nav{display:flex;align-items:center;gap:2px}
.nav a{padding:9px 15px;font-size:14px;font-weight:500;color:rgba(255,255,255,.82);border-radius:10px;position:relative}
.nav a::after{content:'';position:absolute;left:15px;right:15px;bottom:3px;height:2px;background:var(--g400);border-radius:2px;transform:scaleX(0);transition:transform var(--t-fast)}
.nav a:hover,.nav a.active{color:#fff}
.nav a:hover::after,.nav a.active::after{transform:scaleX(1)}
.nav .nav-cta{padding:10px 24px;background:linear-gradient(135deg,var(--g400),var(--g600));color:#fff!important;border-radius:999px;margin-left:14px;box-shadow:0 8px 24px rgba(245,158,11,.3)}
.nav .nav-cta::after{display:none}
.nav .nav-cta:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(245,158,11,.42)}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;width:44px;height:44px;align-items:center;justify-content:center;border-radius:10px}
.nav-toggle span{width:24px;height:2px;background:#fff;border-radius:2px;transition:var(--t-fast)}
.nav-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
.mobile-nav{position:fixed;top:0;right:-100%;width:min(340px,86vw);height:100vh;z-index:950;background:linear-gradient(180deg,var(--b950),var(--b900));display:flex;flex-direction:column;padding:100px 36px 40px;transition:right .5s cubic-bezier(.77,0,.18,1)}
.mobile-nav.open{right:0}
.mobile-nav a{display:flex;align-items:center;justify-content:space-between;padding:16px 4px;font-size:18px;font-family:var(--serif);color:rgba(255,255,255,.85);border-bottom:1px solid rgba(255,255,255,.07)}
.mobile-nav a.active{color:var(--b300)}
.mobile-nav .m-cta{margin-top:28px;background:linear-gradient(135deg,var(--g400),var(--g600));color:#fff;text-align:center;padding:15px;border-radius:999px;border:none}
.nav-overlay{position:fixed;inset:0;z-index:940;background:rgba(4,47,46,.6);backdrop-filter:blur(4px);opacity:0;pointer-events:none;transition:opacity var(--t-fast)}
.nav-overlay.show{opacity:1;pointer-events:auto}

/* ==================== PAGE HERO ==================== */
.page-hero{position:relative;min-height:52vh;padding:calc(var(--nav-h) + 70px) 0 70px;display:flex;align-items:flex-end;color:#fff;overflow:hidden}
.page-hero .bg{position:absolute;inset:0}
.page-hero .bg img{width:100%;height:100%;object-fit:cover}
.page-hero .bg::after{content:'';position:absolute;inset:0;background:linear-gradient(to top,rgba(4,47,46,.92),rgba(4,47,46,.35) 60%,rgba(4,47,46,.55))}
.page-hero .crumb{position:relative;z-index:2;display:flex;gap:8px;align-items:center;font-size:13px;color:rgba(255,255,255,.6);margin-bottom:14px}
.page-hero .crumb a:hover{color:var(--b300)}
.page-hero h1{position:relative;z-index:2;font-size:clamp(2.1rem,5vw,3.8rem);letter-spacing:.08em}
.page-hero p{position:relative;z-index:2;color:rgba(255,255,255,.72);max-width:620px;margin-top:12px}

/* ==================== CARDS ==================== */
.card{background:#fff;border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow-sm);transition:var(--t);border:1px solid rgba(4,47,46,.05)}
.card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.card-media{position:relative;overflow:hidden;aspect-ratio:4/3}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .9s ease}
.card:hover .card-media img{transform:scale(1.08)}
.card-tag{position:absolute;top:14px;left:14px;z-index:2;padding:4px 14px;border-radius:999px;font-size:11px;font-weight:600;letter-spacing:.06em;backdrop-filter:blur(8px)}
.card-tag.teal{background:rgba(20,184,166,.9);color:#fff}
.card-tag.gold{background:rgba(245,158,11,.9);color:#fff}
.card-tag.blue{background:rgba(14,165,233,.9);color:#fff}
.card-tag.slate{background:rgba(100,116,139,.85);color:#fff}
.card-tag.indigo{background:rgba(99,102,241,.9);color:#fff}
.card-body{padding:26px}
.card-body h3{font-size:20px;margin-bottom:10px}
.card-body p{font-size:14px;color:var(--ink-soft);line-height:1.85}
.card-meta{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--b600);margin-top:16px;font-weight:500}
.card-meta svg{width:15px;height:15px}

/* ==================== GRIDS ==================== */
.grid{display:grid;gap:clamp(18px,2.5vw,28px)}
.grid-2{grid-template-columns:1fr}
.grid-3{grid-template-columns:1fr}
.grid-4{grid-template-columns:repeat(2,1fr)}
@media(min-width:640px){.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}}

/* ==================== FEATURE / STATS ==================== */
.stat{text-align:center;padding:clamp(20px,3vw,32px) 14px;border-radius:var(--r);background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.07);transition:var(--t)}
.stat:hover{background:rgba(255,255,255,.07);transform:translateY(-4px)}
.stat b{display:block;font-family:var(--serif);font-size:clamp(1.8rem,3vw,2.8rem);color:var(--b300);font-weight:700;line-height:1.2}
.stat span{font-size:12.5px;color:var(--on-dark-soft);letter-spacing:.12em}

/* ==================== REVEAL ==================== */
[data-reveal]{opacity:0;transform:translateY(36px);transition:opacity .9s ease,transform .9s cubic-bezier(.22,.61,.36,1)}
[data-reveal].revealed{opacity:1;transform:translateY(0)}
[data-reveal="left"]{transform:translateX(-44px)}
[data-reveal="right"]{transform:translateX(44px)}
[data-reveal="zoom"]{transform:scale(.92)}
[data-reveal="left"].revealed,[data-reveal="right"].revealed,[data-reveal="zoom"].revealed{transform:none}

/* ==================== FOOTER ==================== */
.footer{background:var(--b950);color:var(--on-dark-faint);position:relative;overflow:hidden}
.footer::before{content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg width='72' height='72' viewBox='0 0 72 72' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M36 4l6 10 12 3-9 9 2 12-11-6-11 6 2-12-9-9 12-3z' fill='%2314b8a6' fill-opacity='0.05'/%3E%3C/svg%3E")}
.footer .wrap{position:relative;z-index:2}
.ft-grid{display:grid;gap:44px;padding:70px 0 50px;grid-template-columns:1fr}
@media(min-width:640px){.ft-grid{grid-template-columns:1fr 1fr}}
@media(min-width:1024px){.ft-grid{grid-template-columns:1.6fr 1fr 1fr 1.2fr}}
.ft-brand p{font-size:13.5px;line-height:2;max-width:300px;color:var(--on-dark-faint)}
.ft-social{display:flex;gap:10px;margin-top:22px}
.ft-social a{width:40px;height:40px;border-radius:50%;border:1px solid rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center;color:var(--on-dark-soft);transition:var(--t)}
.ft-social a svg{width:16px;height:16px}
.ft-social a:hover{background:var(--b500);color:#fff;border-color:var(--b500);transform:translateY(-3px)}
.ft-title{font-family:var(--serif);color:#fff;font-size:15.5px;font-weight:600;margin-bottom:22px;letter-spacing:.08em}
.ft-links{display:flex;flex-direction:column;gap:13px}
.ft-links a{font-size:13.5px;color:var(--on-dark-faint);display:inline-flex;align-items:center;gap:8px}
.ft-links a:hover{color:var(--b300);transform:translateX(4px)}
.ft-contact{display:flex;flex-direction:column;gap:15px;font-size:13.5px}
.ft-contact li{display:flex;gap:10px;align-items:flex-start;color:var(--on-dark-faint)}
.ft-contact svg{width:16px;height:16px;color:var(--b400);flex-shrink:0;margin-top:3px}
.ft-bottom{border-top:1px solid rgba(255,255,255,.06);padding:26px 0;display:flex;flex-direction:column;gap:8px;align-items:center;justify-content:space-between;font-size:12px}
@media(min-width:768px){.ft-bottom{flex-direction:row}}
.ft-bottom .cn{color:var(--on-dark-faint)}
.ft-bottom .en{font-family:var(--en);font-style:italic;opacity:.5}

/* ==================== LOADER / PROGRESS ==================== */
#loader{position:fixed;inset:0;z-index:9999;background:var(--b950);display:flex;flex-direction:column;align-items:center;justify-content:center;transition:opacity .7s,visibility .7s}
#loader.hide{opacity:0;visibility:hidden}
.loader-mark{position:relative;width:110px;height:110px;margin-bottom:30px}
.loader-mark svg{width:100%;height:100%}
.loader-mark .mtn{fill:none;stroke:var(--b300);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:300;stroke-dashoffset:300;animation:draw 2.2s ease forwards}
.loader-mark .sun{fill:var(--g400);opacity:0;animation:sunIn .8s 1.6s ease forwards}
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes sunIn{to{opacity:1}}
.loader-name{font-family:var(--serif);font-size:26px;color:#fff;letter-spacing:.6em;margin-right:-.6em}
.loader-sub{font-family:var(--en);font-style:italic;color:var(--b300);font-size:12px;letter-spacing:.3em;margin-top:6px}
.loader-bar{width:200px;height:3px;background:rgba(255,255,255,.08);border-radius:3px;margin-top:30px;overflow:hidden}
.loader-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--b500),var(--g400));border-radius:3px;width:0;transition:width .3s ease}
#progress{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--b500),var(--g400));z-index:910;width:0}
#backtop{position:fixed;bottom:26px;right:26px;z-index:800;width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--b500),var(--b700));color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-brand);opacity:0;transform:translateY(18px);transition:var(--t);pointer-events:none}
#backtop svg{width:20px;height:20px}
#backtop.show{opacity:1;transform:translateY(0);pointer-events:auto}
#backtop:hover{transform:translateY(-4px)}

/* ==================== LIGHTBOX ==================== */
#lightbox{position:fixed;inset:0;z-index:960;background:rgba(4,47,46,.96);display:none;align-items:center;justify-content:center;opacity:0;transition:opacity .4s}
#lightbox.show{display:flex;opacity:1}
#lightbox img{max-width:92vw;max-height:86vh;object-fit:contain;border-radius:12px;box-shadow:0 30px 80px rgba(0,0,0,.5);transform:scale(.92);transition:transform .4s ease}
#lightbox.show img{transform:scale(1)}
#lightbox .lb-close{position:absolute;top:22px;right:22px;width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.1);color:#fff;font-size:30px;display:flex;align-items:center;justify-content:center;transition:var(--t)}
#lightbox .lb-close:hover{background:rgba(255,255,255,.2);transform:rotate(90deg)}
#lightbox .lb-cap{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,.65);font-size:14px;letter-spacing:.1em}

/* ==================== TIMELINE ==================== */
.timeline{position:relative;max-width:760px;margin:0 auto;padding-left:34px}
.timeline::before{content:'';position:absolute;left:11px;top:6px;bottom:6px;width:2px;background:linear-gradient(180deg,var(--b400),var(--b600),transparent)}
.tl-item{position:relative;padding:0 0 44px}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{content:'';position:absolute;left:-31px;top:6px;width:14px;height:14px;border-radius:50%;background:var(--b500);border:3px solid var(--b950);box-shadow:0 0 0 3px var(--b300)}
.tl-time{font-size:12px;color:var(--b500);letter-spacing:.14em;font-weight:600}
.tl-title{font-family:var(--serif);font-size:19px;margin:6px 0 8px;color:#fff}
.tl-text{font-size:14px;line-height:1.9;color:var(--on-dark-soft)}

/* ==================== TABS ==================== */
.tabs{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:clamp(32px,5vw,52px)}
.tab{padding:10px 26px;border-radius:999px;font-size:14px;font-weight:500;background:#fff;color:var(--ink);border:1px solid rgba(4,47,46,.1);transition:var(--t)}
.tab:hover{border-color:var(--b400)}
.tab.active{background:linear-gradient(135deg,var(--b500),var(--b600));color:#fff;border-color:transparent;box-shadow:var(--shadow-brand)}

/* ==================== CHIPS / DIVIDERS ==================== */
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{display:inline-flex;align-items:center;gap:7px;padding:7px 18px;border-radius:999px;font-size:13px;background:rgba(20,184,166,.09);color:var(--b700);font-weight:500}
.chip svg{width:14px;height:14px}
.chip.gold{background:rgba(245,158,11,.1);color:var(--g600)}
.chip.blue{background:rgba(14,165,233,.1);color:var(--l600)}
.chip.slate{background:rgba(100,116,139,.1);color:#64748b}

/* ==================== MISC ==================== */
.rule{width:60px;height:3px;border-radius:3px;background:linear-gradient(90deg,var(--b500),var(--g400));margin:22px 0}
.rule.center{margin-left:auto;margin-right:auto}
.badge{display:inline-flex;align-items:center;gap:6px;padding:5px 16px;border-radius:999px;font-size:12px;font-weight:600;letter-spacing:.08em}
.badge-teal{background:rgba(20,184,166,.1);color:var(--b600)}
.badge-gold{background:rgba(245,158,11,.12);color:var(--g600)}
.glass{background:rgba(255,255,255,.08);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid rgba(255,255,255,.14)}
.text-grad{background:linear-gradient(135deg,var(--b300),var(--b500),var(--g400));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.divider-wave{position:relative;height:90px;overflow:hidden;background:transparent}
.divider-wave svg{position:absolute;bottom:0;left:0;width:100%;height:100%}

/* ==================== RESPONSIVE ==================== */
@media(max-width:1024px){
  .nav a:not(.nav-cta){display:none}
  .nav-toggle{display:flex}
  .nav .nav-cta{margin-left:8px}
}
@media(max-width:640px){
  :root{--nav-h:64px}
  .btn-lg{padding:14px 34px}
  .section{padding:64px 0}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s!important;transition-duration:.001s!important}
  [data-reveal]{opacity:1;transform:none}
  html{scroll-behavior:auto}
}