/* ===== Reset & Base ===== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Inter","Roboto",sans-serif;color:#333;background:#fff;line-height:1.6}
a{text-decoration:none;color:inherit;transition:color .2s}
ul,ol{list-style:none}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ===== Color Variables ===== */
:root{
  --primary:#D0021B;
  --primary-dark:#b8021a;
  --dark:#1a1a2e;
  --dark2:#16213e;
  --gray:#f5f6fa;
  --gray2:#e8e8e8;
  --text:#333;
  --text-light:#666;
  --text-lighter:#999;
  --ai-gradient:linear-gradient(135deg,#667eea 0%,#764ba2 100%);
  --radius:10px;
}

/* ===== Navigation ===== */
.nav{position:sticky;top:0;z-index:1000;background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.08);padding:0 0}
.nav .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{display:flex;align-items:center;gap:8px;font-size:22px;font-weight:700;color:var(--primary)}
.nav-logo span{color:var(--dark)}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{padding:8px 14px;font-size:14px;color:var(--text);border-radius:6px;transition:all .2s}
.nav-links a:hover{color:var(--primary);background:rgba(208,2,27,.06)}
.nav-links .dropdown{position:relative}
.nav-links .dropdown-menu{display:none;position:absolute;top:100%;left:0;background:#fff;min-width:180px;box-shadow:0 8px 24px rgba(0,0,0,.12);border-radius:8px;padding:8px 0;z-index:100}
.nav-links .dropdown:hover .dropdown-menu{display:block}
.dropdown-menu a{display:block;padding:10px 20px;font-size:13px;border-radius:0}
.dropdown-menu a:hover{background:var(--gray);color:var(--primary)}
.nav-actions{display:flex;align-items:center;gap:12px}
.nav-actions a{padding:8px 16px;font-size:14px;border-radius:6px}
.btn-login{color:var(--text);border:1px solid var(--gray2)}
.btn-login:hover{border-color:var(--primary);color:var(--primary)}
.btn-vip{background:linear-gradient(135deg,#f5af19,#f12711);color:#fff;font-weight:600}
.btn-vip:hover{opacity:.9}
.nav-toggle{display:none;flex-direction:column;gap:4px;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px}

/* ===== Hero Section ===== */
.hero{background:linear-gradient(135deg,#fff5f5 0%,#f0f4ff 50%,#f5f0ff 100%);padding:60px 0 80px}
.hero .container{display:flex;gap:40px;align-items:flex-start}
.hero-left{flex:0 0 58%}
.hero-right{flex:0 0 38%;position:sticky;top:100px}
.hero h1{font-size:36px;font-weight:800;color:var(--dark);margin-bottom:8px;line-height:1.3}
.hero h1 em{font-style:normal;color:var(--primary)}
.hero-sub{font-size:16px;color:var(--text-light);margin-bottom:28px}
.hero-tabs{display:flex;gap:0;margin-bottom:0}
.hero-tabs a{padding:10px 22px;font-size:14px;font-weight:600;color:var(--text-light);background:rgba(255,255,255,.6);border:1px solid var(--gray2);border-bottom:none;border-radius:8px 8px 0 0;margin-right:-1px;transition:all .2s}
.hero-tabs a.active,.hero-tabs a:hover{background:#fff;color:var(--primary);border-color:#fff;box-shadow:0 -2px 8px rgba(0,0,0,.04)}
.hero-input{background:#fff;border-radius:0 8px 8px 8px;box-shadow:0 4px 20px rgba(0,0,0,.08);padding:24px;border:1px solid var(--gray2)}
.lang-bar{display:flex;align-items:center;gap:12px;margin-bottom:16px;padding-bottom:16px;border-bottom:1px solid var(--gray)}
.lang-bar select{padding:8px 12px;border:1px solid var(--gray2);border-radius:6px;font-size:14px;background:#fff;color:var(--text)}
.lang-swap{width:32px;height:32px;border-radius:50%;background:var(--gray);display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--text-light);transition:all .2s}
.lang-swap:hover{background:var(--primary);color:#fff}
.hero-textarea{width:100%;min-height:140px;border:none;outline:none;font-size:16px;resize:vertical;font-family:inherit;color:var(--text);line-height:1.8}
.hero-textarea::placeholder{color:var(--text-lighter)}
.hero-btns{display:flex;gap:12px;margin-top:20px}
.btn-primary{display:inline-flex;align-items:center;justify-content:center;padding:12px 36px;background:var(--primary);color:#fff;font-size:16px;font-weight:600;border-radius:8px;transition:all .2s}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 16px rgba(208,2,27,.3)}
.btn-secondary{display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;background:var(--ai-gradient);color:#fff;font-size:15px;font-weight:600;border-radius:8px;transition:all .2s}
.btn-secondary:hover{opacity:.9;transform:translateY(-1px);box-shadow:0 4px 16px rgba(102,126,234,.3)}
.hero-extra{display:flex;gap:16px;margin-top:16px}
.hero-extra a{font-size:13px;color:var(--text-light);display:flex;align-items:center;gap:4px}
.hero-extra a:hover{color:var(--primary)}
.hero-preview{background:#fff;border-radius:var(--radius);box-shadow:0 4px 20px rgba(0,0,0,.08);padding:28px;min-height:300px;border:1px solid var(--gray2)}
.hero-preview h3{font-size:15px;color:var(--text-light);margin-bottom:16px}
.preview-content{font-size:14px;color:var(--text);line-height:2}
.preview-result{background:var(--gray);border-radius:8px;padding:16px;margin-top:12px}
.preview-result p{font-size:14px;line-height:1.8;color:var(--text)}
.preview-actions{display:flex;gap:12px;margin-top:16px}
.preview-actions a{font-size:13px;color:var(--text-light);padding:6px 12px;border:1px solid var(--gray2);border-radius:6px}
.preview-actions a:hover{color:var(--primary);border-color:var(--primary)}

/* ===== Section Common ===== */
.section{padding:70px 0}
.section-alt{background:var(--gray)}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:30px;font-weight:700;color:var(--dark);margin-bottom:10px}
.section-title p{font-size:16px;color:var(--text-light)}

/* ===== Scene Cards ===== */
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.scene-card{background:#fff;border-radius:var(--radius);padding:32px 24px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:all .3s;border:1px solid transparent}
.scene-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.1);border-color:var(--primary)}
.scene-card a{display:block}
.scene-icon{width:56px;height:56px;margin:0 auto 16px;background:var(--gray);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:26px}
.scene-card h3{font-size:18px;font-weight:600;margin-bottom:8px;color:var(--dark)}
.scene-card p{font-size:14px;color:var(--text-light);line-height:1.6}

/* ===== AI Engine ===== */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:#fff;border-radius:var(--radius);padding:36px 28px;box-shadow:0 2px 12px rgba(0,0,0,.06);border-left:4px solid;border-image:var(--ai-gradient) 1;transition:all .3s}
.ai-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.1)}
.ai-card h3{font-size:18px;font-weight:600;margin-bottom:12px;color:var(--dark)}
.ai-card p{font-size:14px;color:var(--text-light);line-height:1.8}
.ai-card .ai-stat{display:flex;gap:24px;margin-top:16px}
.ai-card .ai-stat span{font-size:24px;font-weight:700;color:var(--primary)}
.ai-card .ai-stat small{font-size:12px;color:var(--text-lighter);display:block}
.ai-cta{text-align:center;margin-top:36px}

/* ===== Product Ecosystem ===== */
.eco-scroll{display:flex;gap:24px;overflow-x:auto;padding-bottom:12px;scroll-snap-type:x mandatory}
.eco-scroll::-webkit-scrollbar{height:4px}
.eco-scroll::-webkit-scrollbar-thumb{background:var(--gray2);border-radius:4px}
.eco-card{min-width:280px;background:#fff;border-radius:var(--radius);padding:28px 24px;box-shadow:0 2px 12px rgba(0,0,0,.06);scroll-snap-align:start;flex-shrink:0;transition:all .3s;border:1px solid transparent}
.eco-card:hover{border-color:var(--primary);transform:translateY(-2px)}
.eco-card h3{font-size:17px;font-weight:600;margin-bottom:8px;color:var(--dark)}
.eco-card p{font-size:13px;color:var(--text-light);margin-bottom:16px;line-height:1.6}
.eco-card .btn-download{display:inline-flex;align-items:center;gap:6px;padding:8px 20px;background:var(--primary);color:#fff;font-size:13px;font-weight:600;border-radius:6px;transition:all .2s}
.eco-card .btn-download:hover{background:var(--primary-dark)}

/* ===== Human Translation ===== */
.human-wrap{display:flex;gap:40px;align-items:center}
.human-left{flex:1}
.human-right{flex:1}
.human-left h2{font-size:28px;font-weight:700;color:var(--dark);margin-bottom:16px}
.human-left p{font-size:15px;color:var(--text-light);line-height:1.8;margin-bottom:24px}
.human-flow{display:flex;gap:0;align-items:center;margin-bottom:28px;flex-wrap:wrap}
.human-flow .step{display:flex;align-items:center;gap:8px;padding:10px 16px;background:#fff;border-radius:8px;font-size:13px;font-weight:600;color:var(--dark);box-shadow:0 2px 8px rgba(0,0,0,.06)}
.human-flow .arrow{color:var(--text-lighter);font-size:18px;margin:0 4px}
.human-right{background:var(--gray);border-radius:var(--radius);padding:32px}
.human-right h3{font-size:18px;font-weight:600;margin-bottom:16px}
.human-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.human-stats .stat{text-align:center;padding:16px}
.human-stats .stat strong{display:block;font-size:28px;font-weight:700;color:var(--primary)}
.human-stats .stat span{font-size:13px;color:var(--text-light)}

/* ===== Trust / Brand ===== */
.trust-logos{display:flex;flex-wrap:wrap;justify-content:center;gap:32px;margin-bottom:36px}
.trust-logos .logo-item{padding:16px 28px;background:#fff;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.04);font-size:15px;font-weight:600;color:var(--text-light)}
.trust-data{display:flex;justify-content:center;gap:60px;margin-top:36px}
.trust-data .data-item{text-align:center}
.trust-data .data-item strong{display:block;font-size:36px;font-weight:700;color:var(--primary)}
.trust-data .data-item span{font-size:14px;color:var(--text-light)}
.trust-awards{display:flex;justify-content:center;gap:24px;margin-top:28px;flex-wrap:wrap}
.trust-awards .award{padding:10px 20px;background:#fff;border:1px solid var(--gray2);border-radius:8px;font-size:13px;color:var(--text-light)}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:var(--radius);margin-bottom:16px;box-shadow:0 2px 8px rgba(0,0,0,.04);overflow:hidden;border:1px solid var(--gray2)}
.faq-item details{padding:0}
.faq-item summary{padding:20px 24px;font-size:16px;font-weight:600;color:var(--dark);cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;transition:background .2s}
.faq-item summary:hover{background:var(--gray)}
.faq-item summary::after{content:"+";font-size:20px;color:var(--text-lighter);transition:transform .2s}
.faq-item details[open] summary::after{content:"−"}
.faq-answer{padding:0 24px 20px;font-size:14px;color:var(--text-light);line-height:2}
.faq-answer ol{padding-left:20px;list-style:decimal}
.faq-answer ol li{margin-bottom:6px}

/* ===== Footer ===== */
.footer{background:var(--dark);color:#ccc;padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.footer-brand h3{color:#fff;font-size:20px;margin-bottom:12px}
.footer-brand p{font-size:13px;line-height:1.8;color:#999}
.footer-col h4{color:#fff;font-size:14px;margin-bottom:16px}
.footer-col a{display:block;font-size:13px;color:#999;padding:4px 0;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:12px;color:#666}

/* ===== Subpage Hero ===== */
.sub-hero{background:linear-gradient(135deg,#fff5f5 0%,#f0f4ff 50%,#f5f0ff 100%);padding:50px 0 60px}
.sub-hero h1{font-size:32px;font-weight:700;color:var(--dark);margin-bottom:10px}
.sub-hero p{font-size:16px;color:var(--text-light);max-width:600px}
.sub-hero .breadcrumb{margin-bottom:16px;font-size:13px;color:var(--text-lighter)}
.sub-hero .breadcrumb a{color:var(--text-light)}
.sub-hero .breadcrumb a:hover{color:var(--primary)}

/* ===== Feature Blocks ===== */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.feature-block{background:#fff;border-radius:var(--radius);padding:32px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.feature-block h3{font-size:20px;font-weight:600;margin-bottom:12px;color:var(--dark)}
.feature-block p{font-size:14px;color:var(--text-light);line-height:1.8;margin-bottom:16px}
.feature-list{padding-left:0}
.feature-list li{padding:8px 0;font-size:14px;color:var(--text);display:flex;align-items:flex-start;gap:8px}
.feature-list li::before{content:"✓";color:var(--primary);font-weight:700;flex-shrink:0}

/* ===== Download Section ===== */
.download-section{text-align:center;padding:60px 0}
.download-btns{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-top:24px}
.download-btns a{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;background:var(--primary);color:#fff;font-size:15px;font-weight:600;border-radius:8px;transition:all .2s}
.download-btns a:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 4px 16px rgba(208,2,27,.3)}
.download-btns a.outline{background:transparent;border:2px solid var(--primary);color:var(--primary)}
.download-btns a.outline:hover{background:var(--primary);color:#fff}

/* ===== Process Steps ===== */
.process-steps{display:flex;gap:0;justify-content:center;flex-wrap:wrap;margin:32px 0}
.process-step{text-align:center;padding:20px 24px;position:relative;flex:1;min-width:160px}
.process-step .step-num{width:40px;height:40px;margin:0 auto 12px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700}
.process-step h4{font-size:15px;font-weight:600;margin-bottom:6px;color:var(--dark)}
.process-step p{font-size:13px;color:var(--text-light)}

/* ===== API Page ===== */
.api-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.api-card{background:#fff;border-radius:var(--radius);padding:28px;box-shadow:0 2px 12px rgba(0,0,0,.06);text-align:center;transition:all .3s}
.api-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.1)}
.api-card h3{font-size:17px;font-weight:600;margin-bottom:8px;color:var(--dark)}
.api-card p{font-size:13px;color:var(--text-light);margin-bottom:16px;line-height:1.6}
.api-card a{display:inline-flex;padding:8px 20px;background:var(--dark);color:#fff;font-size:13px;border-radius:6px}
.api-card a:hover{background:var(--primary)}

/* ===== About Page ===== */
.about-intro{text-align:center;max-width:800px;margin:0 auto 48px}
.about-intro p{font-size:16px;color:var(--text-light);line-height:2}
.about-timeline{max-width:700px;margin:0 auto}
.timeline-item{display:flex;gap:24px;margin-bottom:32px;position:relative}
.timeline-dot{width:12px;height:12px;background:var(--primary);border-radius:50%;flex-shrink:0;margin-top:6px}
.timeline-content h4{font-size:16px;font-weight:600;color:var(--dark);margin-bottom:4px}
.timeline-content p{font-size:14px;color:var(--text-light)}

/* ===== Responsive ===== */
@media(max-width:1199px){
  .hero .container{flex-direction:column}
  .hero-left,.hero-right{flex:none;width:100%}
  .hero-right{position:static}
  .scene-grid{grid-template-columns:repeat(2,1fr)}
  .ai-grid{grid-template-columns:repeat(2,1fr)}
  .human-wrap{flex-direction:column}
  .footer-grid{grid-template-columns:repeat(3,1fr)}
  .feature-grid{grid-template-columns:1fr}
}
@media(max-width:767px){
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:16px;box-shadow:0 8px 24px rgba(0,0,0,.1)}
  .nav-links.active{display:flex}
  .nav-toggle{display:flex}
  .nav-actions .btn-login span{display:none}
  .hero h1{font-size:26px}
  .scene-grid{grid-template-columns:1fr}
  .ai-grid{grid-template-columns:1fr}
  .trust-data{flex-direction:column;gap:24px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .section-title h2{font-size:24px}
  .process-steps{flex-direction:column;align-items:center}
  .api-cards{grid-template-columns:1fr}
  .hero-tabs{flex-wrap:wrap}
  .eco-card{min-width:240px}
}