:root{
  --paper:#f4ead5;--paper2:#ede0c2;--ink:#1c160f;--ink2:#3a2f22;--ink3:#6b5b46;
  --vermilion:#a72d20;--vermilion-d:#7a1d12;--gold:#b8893a;--gold-l:#d8b56a;
  --jade:#4a6b3e;--line:rgba(28,22,15,.15);
  --serif:'Noto Serif SC',SimSun,serif;--display:'ZCOOL XiaoWei','Noto Serif SC',serif;
  --hand:'Ma Shan Zheng','Long Cang',cursive;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--serif);color:var(--ink);background:var(--paper);line-height:1.8;font-size:15px}
a{color:var(--vermilion);text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* NAV */
.site-nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(244,234,213,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);transition:box-shadow .3s}
.site-nav.scrolled{box-shadow:0 2px 20px rgba(28,22,15,.12)}
.site-nav .inner{max-width:1200px;margin:0 auto;padding:0 24px;display:flex;align-items:center;height:64px}
.site-nav .logo{display:flex;align-items:center;gap:10px;font-family:var(--display);font-size:18px;font-weight:700;letter-spacing:2px;color:var(--ink)}
.site-nav .logo .seal{width:36px;height:36px;background:var(--vermilion);color:#fff;display:grid;place-items:center;font-size:14px;font-family:var(--display);border-radius:4px;transform:rotate(-3deg);border:2px solid rgba(255,255,255,.5)}
.site-nav .links{margin-left:auto;display:flex;gap:28px;align-items:center}
.site-nav .links a{color:var(--ink2);font-size:14px;letter-spacing:1px;transition:color .2s}
.site-nav .links a:hover,.site-nav .links a.active{color:var(--vermilion)}
.site-nav .links a.btn-apply.active,.site-nav .links a.btn-apply:hover{color:#fff;background:var(--vermilion-d)}
.site-nav .links .btn-apply{background:var(--vermilion);color:#fff;padding:8px 20px;border-radius:2px;font-size:13px;letter-spacing:2px}
.site-nav .links .btn-apply:hover{background:var(--vermilion-d)}
.nav-toggle{display:none;background:none;border:none;font-size:22px;cursor:pointer;color:var(--ink)}
@media(max-width:768px){
  .site-nav .links{display:none;position:absolute;top:64px;left:0;right:0;background:var(--paper);flex-direction:column;padding:20px;gap:16px;border-bottom:1px solid var(--line)}
  .site-nav .links.open{display:flex}
  .nav-toggle{display:block;margin-left:auto}
}

/* HERO */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;padding:100px 0 60px;background:linear-gradient(160deg,rgba(167,45,32,.08),var(--paper) 40%,rgba(74,107,62,.06))}
.hero::before{content:"";position:absolute;right:-80px;top:10%;width:500px;height:500px;background:radial-gradient(circle,rgba(167,45,32,.12),transparent 70%);pointer-events:none}
.hero .container{display:flex;align-items:center;gap:60px}
.hero-text{flex:1;min-width:320px}
.hero-text .tag{display:inline-block;background:rgba(167,45,32,.1);color:var(--vermilion);font-size:12px;padding:4px 14px;letter-spacing:3px;margin-bottom:18px;border:1px solid rgba(167,45,32,.2)}
.hero-text h1{font-family:var(--display);font-size:clamp(36px,5vw,56px);line-height:1.2;letter-spacing:4px;margin-bottom:16px}
.hero-text h1 em{color:var(--vermilion);font-style:normal}
.hero-text .sub{font-size:17px;color:var(--ink3);line-height:2;margin-bottom:32px;max-width:520px}
.hero-text .sub strong{color:var(--ink)}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-block;padding:14px 32px;font-family:var(--display);font-size:15px;letter-spacing:3px;border:none;cursor:pointer;transition:all .2s}
.btn-primary{background:var(--vermilion);color:#fff}.btn-primary:hover{background:var(--vermilion-d);transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--ink);border:1px solid var(--ink)}.btn-outline:hover{background:var(--ink);color:var(--paper)}
.hero-visual{flex:1;min-width:300px;position:relative}
.hero-visual .mockup{border-radius:8px;box-shadow:0 30px 80px -20px rgba(28,22,15,.25);border:1px solid var(--line)}
.hero-stats{display:flex;gap:40px;margin-top:40px}
.hero-stats .stat b{display:block;font-family:var(--display);font-size:32px;color:var(--vermilion)}
.hero-stats .stat span{font-size:12px;color:var(--ink3);letter-spacing:1px}

/* SECTION */
.section{padding:80px 0}
.section-alt{background:linear-gradient(180deg,rgba(237,224,194,.4),transparent)}
.section-dark{background:var(--ink);color:var(--paper)}
.section-dark .section-title{color:var(--paper)}
.section-dark .section-title::after{background:var(--gold)}
.section-title{text-align:center;font-family:var(--display);font-size:clamp(28px,3.5vw,38px);letter-spacing:4px;margin-bottom:12px;position:relative}
.section-title::after{content:"";display:block;width:40px;height:3px;background:var(--vermilion);margin:14px auto 0}
.section-sub{text-align:center;color:var(--ink3);font-size:14px;letter-spacing:2px;margin-bottom:48px}

/* AI FEATURES */
.ai-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.ai-card{background:rgba(255,250,238,.6);border:1px solid var(--line);padding:28px;position:relative;overflow:hidden;transition:transform .2s,box-shadow .2s}
.ai-card:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(28,22,15,.1)}
.ai-card .icon{width:48px;height:48px;background:linear-gradient(135deg,var(--gold-l),var(--gold));border-radius:50%;display:grid;place-items:center;color:#fff;font-size:22px;margin-bottom:16px}
.ai-card h3{font-family:var(--display);font-size:18px;letter-spacing:2px;margin-bottom:8px}
.ai-card p{font-size:13px;color:var(--ink3);line-height:1.8;text-indent:2em}
.ai-card .watermark{position:absolute;right:-10px;bottom:-20px;font-family:var(--hand);font-size:80px;color:var(--vermilion);opacity:.06}

/* PLATFORM */
.platform-tabs{display:flex;justify-content:center;gap:12px;margin-bottom:36px;flex-wrap:wrap}
.platform-tabs .tab{padding:10px 28px;font-family:var(--display);font-size:14px;letter-spacing:2px;background:transparent;border:1px solid var(--line);cursor:pointer;transition:all .2s;color:var(--ink3)}
.platform-tabs .tab.active,.platform-tabs .tab:hover{background:var(--vermilion);color:#fff;border-color:var(--vermilion)}
.platform-gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.platform-gallery img{border-radius:4px;border:1px solid var(--line);box-shadow:0 4px 20px rgba(28,22,15,.08);transition:transform .3s}
.platform-gallery img:hover{transform:scale(1.03)}
.platform-gallery img,.about-grid img,.hero-visual img{cursor:zoom-in}
@media(max-width:768px){.platform-gallery{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.platform-gallery{grid-template-columns:1fr}}

/* FLOW */
.flow-steps{display:flex;gap:0;overflow-x:auto;padding:0 20px}
.flow-step{flex:1;min-width:180px;text-align:center;padding:24px 16px;position:relative}
.flow-step::after{content:"→";position:absolute;right:-8px;top:38px;color:var(--gold);font-size:24px}
.flow-step:last-child::after{display:none}
.flow-step .num{width:48px;height:48px;margin:0 auto 12px;background:var(--vermilion);color:#fff;font-family:var(--display);font-size:20px;display:grid;place-items:center;border-radius:50%}
.flow-step h4{font-family:var(--display);font-size:15px;letter-spacing:1px;margin-bottom:6px}
.flow-step p{font-size:12px;color:var(--ink3);line-height:1.6}

/* DOWNLOAD */
.dl-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.dl-card{background:rgba(255,250,238,.6);border:1px solid var(--line);padding:36px;text-align:center}
.dl-card h3{font-family:var(--display);font-size:20px;letter-spacing:2px;margin-bottom:12px}
.dl-card p{font-size:13px;color:var(--ink3);margin-bottom:20px}
.dl-card .qr{width:180px;height:180px;margin:0 auto 16px;background:var(--paper2);border:2px dashed var(--line);display:grid;place-items:center;font-size:13px;color:var(--ink3)}
@media(max-width:768px){.dl-grid{grid-template-columns:1fr}}

/* FORM */
.form-section{max-width:720px;margin:0 auto}
.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:13px;color:var(--ink2);letter-spacing:1px;margin-bottom:6px;font-weight:600}
.form-group label .req{color:var(--vermilion)}
.form-input{width:100%;padding:12px 14px;border:1px solid var(--line);background:rgba(255,250,238,.4);font-size:14px;font-family:var(--serif);outline:none;transition:border-color .2s}
.form-input:focus{border-color:var(--vermilion)}
textarea.form-input{min-height:100px;resize:vertical}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:600px){.form-row{grid-template-columns:1fr}}
.form-hint{font-size:11px;color:var(--ink3);margin-top:20px;text-align:center;line-height:1.6}

/* FOOTER */
.site-footer{background:var(--ink);color:rgba(244,234,213,.6);padding:48px 0 28px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
.footer-grid h4{color:var(--gold-l);font-family:var(--display);font-size:15px;letter-spacing:2px;margin-bottom:12px}
.footer-grid a{color:rgba(244,234,213,.5);font-size:13px;display:block;margin-bottom:6px;transition:color .2s}
.footer-grid a:hover{color:var(--gold-l)}
.footer-grid p{font-size:13px;line-height:1.8}
.footer-bottom{border-top:1px solid rgba(244,234,213,.1);padding-top:20px;text-align:center;font-size:12px;letter-spacing:1px;color:rgba(244,234,213,.35)}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.footer-grid{grid-template-columns:1fr}}

/* ABOUT */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.about-grid .text h3{font-family:var(--display);font-size:22px;letter-spacing:2px;margin-bottom:14px}
.about-grid .text p{font-size:14px;color:var(--ink2);line-height:2;text-indent:2em;margin-bottom:12px}
.about-values{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:20px}
.about-values .val{text-align:center;padding:16px}
.about-values .val .big{font-family:var(--hand);font-size:40px;color:var(--vermilion);opacity:.7}
.about-values .val h4{font-family:var(--display);font-size:14px;letter-spacing:1px;margin-top:6px}
@media(max-width:768px){.about-grid{grid-template-columns:1fr}.about-values{grid-template-columns:repeat(2,1fr)}}

/* ANIM */
.fade-up{opacity:0;transform:translateY(30px);transition:opacity .7s,transform .7s}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* LIGHTBOX */
.lightbox{position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.8);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .3s;cursor:zoom-out;backdrop-filter:blur(4px)}
.lightbox.open{opacity:1;pointer-events:auto}
.lightbox img{max-width:92vw;max-height:88vh;object-fit:contain;border-radius:4px;box-shadow:0 8px 40px rgba(0,0,0,.4);transform:scale(.92);transition:transform .35s}
.lightbox.open img{transform:scale(1)}
.lightbox .close{position:absolute;top:20px;right:24px;color:rgba(255,255,255,.7);font-size:28px;cursor:pointer;width:40px;height:40px;display:grid;place-items:center;background:rgba(0,0,0,.3);border-radius:50%;transition:color .2s}
.lightbox .close:hover{color:#fff}
.lightbox .nav-arrow{position:absolute;top:50%;transform:translateY(-50%);color:rgba(255,255,255,.7);font-size:32px;cursor:pointer;width:48px;height:48px;display:grid;place-items:center;background:rgba(0,0,0,.3);border-radius:50%;transition:color .2s,background .2s}
.lightbox .nav-arrow:hover{color:#fff;background:rgba(0,0,0,.5)}
.lightbox .prev{left:16px}
.lightbox .next{right:16px}
.lightbox .counter{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,.5);font-size:13px;letter-spacing:2px}