/* ============================================
   51tokens 企业级精细化管理平台 - 全局样式
   ============================================ */

/* ---------- Reset & Base ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#1a1a2e;background:#fff;line-height:1.7;font-size:16px;overflow-x:hidden}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;display:block}

/* ---------- Container ---------- */
.container{max-width:1200px;margin:0 auto;padding:0 24px}
@media (max-width:768px){.container{padding:0 16px}}

/* ---------- Header / Navigation ---------- */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid rgba(0,0,0,.06);transition:all .3s ease}
.header.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}

.logo{display:flex;align-items:center;font-weight:700;font-size:18px;white-space:nowrap}
.logo-text{color:#1a1a2e;letter-spacing:-.3px;background:linear-gradient(135deg,#4361ee,#3a0ca3);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

.nav{display:flex;align-items:center;gap:32px}
.nav-link{color:#555;font-size:15px;font-weight:500;position:relative;padding:4px 0;transition:color .3s}
.nav-link::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:linear-gradient(135deg,#4361ee,#3a0ca3);transition:width .3s;border-radius:1px}
.nav-link:hover,.nav-link.active{color:#4361ee}
.nav-link:hover::after,.nav-link.active::after{width:100%}

.btn-login{white-space:nowrap}

.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px;z-index:1001}
.hamburger span{display:block;width:24px;height:2px;background:#1a1a2e;border-radius:1px;transition:.3s}

@media (max-width:768px){
  .nav{position:fixed;top:0;right:-100%;flex-direction:column;width:260px;height:100vh;background:#fff;padding:80px 24px 24px;gap:20px;box-shadow:-4px 0 20px rgba(0,0,0,.1);transition:right .3s}
  .nav.open{right:0}
  .hamburger{display:flex}
  .nav .btn-login{width:100%;text-align:center}
}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 24px;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;transition:all .3s;border:2px solid transparent;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,#4361ee,#3a0ca3);color:#fff;border-color:transparent}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(67,97,238,.35)}
.btn-outline{background:transparent;color:#4361ee;border-color:#4361ee}
.btn-outline:hover{background:#4361ee;color:#fff;transform:translateY(-2px)}
.btn-white{background:#fff;color:#4361ee;border-color:#fff}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,255,255,.35)}
.btn-outline-white{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}
.btn-outline-white:hover{background:rgba(255,255,255,.1);border-color:#fff;transform:translateY(-2px)}
.btn-lg{padding:14px 36px;font-size:17px;border-radius:10px}

@media (max-width:480px){
  .btn-lg{padding:12px 24px;font-size:15px}
}

/* ---------- Section ---------- */
.section{padding:100px 0}
@media (max-width:768px){.section{padding:64px 0}}
.section-dark{background:#0f0f23;color:#fff}
.section-dark .section-desc{color:rgba(255,255,255,.65)}
.section-cta{background:linear-gradient(135deg,#4361ee,#3a0ca3);color:#fff;text-align:center;padding:80px 0}
.section-cta h2{font-size:36px;margin-bottom:16px}
.section-cta p{font-size:18px;opacity:.9;margin-bottom:32px;max-width:600px;margin-left:auto;margin-right:auto}
@media (max-width:768px){
  .section-cta h2{font-size:28px}
  .section-cta p{font-size:16px}
}

.section-header{text-align:center;margin-bottom:60px}
.section-title{font-size:36px;font-weight:800;margin-bottom:16px;letter-spacing:-.5px}
@media (max-width:768px){.section-title{font-size:28px}}
.section-desc{font-size:18px;color:#666;max-width:640px;margin:0 auto}
.highlight{background:linear-gradient(135deg,#4361ee,#3a0ca3);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;padding-top:68px}
.hero-bg{position:absolute;inset:0;background:linear-gradient(135deg,#0f0f23 0%,#1a1a3e 30%,#16213e 60%,#0f0f23 100%);z-index:0}
.hero-bg::before{content:'';position:absolute;top:-50%;right:-20%;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(67,97,238,.15),transparent 70%)}
.hero-bg::after{content:'';position:absolute;bottom:-30%;left:-10%;width:500px;height:500px;border-radius:50%;background:radial-gradient(circle,rgba(58,12,163,.12),transparent 70%)}
.hero-content{position:relative;z-index:2;padding:80px 0;color:#fff}
.hero-badge{display:inline-block;padding:6px 16px;background:rgba(67,97,238,.15);border:1px solid rgba(67,97,238,.3);border-radius:20px;font-size:14px;color:#7b9bff;margin-bottom:24px;font-weight:500}
.hero-title{font-size:56px;font-weight:900;line-height:1.15;margin-bottom:24px;letter-spacing:-1.5px}
@media (max-width:768px){.hero-title{font-size:36px}}
.hero-subtitle{font-size:20px;color:rgba(255,255,255,.7);max-width:560px;margin-bottom:40px;line-height:1.7}
@media (max-width:768px){.hero-subtitle{font-size:16px}}
.hero-slogan{font-size:17px;color:rgba(255,255,255,.9);line-height:2;margin-bottom:28px;padding:18px 24px;background:rgba(67,97,238,.08);border:1px solid rgba(67,97,238,.2);border-radius:12px;max-width:700px;text-align:left}
.slogan-sep{color:rgba(255,255,255,.35);margin:0 1px}
.slogan-highlight{color:#7b9bff;font-weight:700}
.hero-highlights{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:36px;max-width:720px}
.highlight-item{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:20px 12px;text-align:center;transition:all .3s;backdrop-filter:blur(4px)}
.highlight-item:hover{background:rgba(67,97,238,.12);border-color:rgba(67,97,238,.4);transform:translateY(-3px)}
.highlight-num{display:block;font-size:28px;font-weight:900;color:#7b9bff;line-height:1.2;margin-bottom:8px;letter-spacing:-.5px}
.highlight-label{display:block;font-size:13px;color:rgba(255,255,255,.55);line-height:1.5}
@media (max-width:640px){
  .hero-highlights{grid-template-columns:repeat(2,1fr);gap:10px;max-width:100%}
  .highlight-item{padding:14px 10px}
  .highlight-num{font-size:22px}
  .highlight-label{font-size:12px}
}
@media (max-width:640px){
  .hero-slogan{font-size:14px;padding:14px 16px;line-height:1.9;text-align:left}
}
@media (max-width:480px){
  .hero-slogan{font-size:13px;padding:12px}
}
@media (max-width:480px){
  .hero-slogan{font-size:13px;padding:12px}
}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
@media (max-width:768px){.hero-actions{gap:10px;justify-content:center}}
@media (max-width:768px){.hero-actions .btn{min-width:140px;padding:8px 0!important;font-size:13px!important;border-radius:6px!important;border-width:1px!important;flex:none!important}}

/* ---------- Cards Grid (痛点) ---------- */
.cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
@media (max-width:900px){.cards-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.cards-grid{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid #eee;border-radius:16px;padding:32px;transition:all .3s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(0,0,0,.1);border-color:transparent}
.card-icon{font-size:36px;margin-bottom:16px;width:56px;height:56px;display:flex;align-items:center;justify-content:center;border-radius:12px}
.icon-cost{background:rgba(255,152,0,.1)}
.icon-risk{background:rgba(244,67,54,.1)}
.icon-chaos{background:rgba(156,39,176,.1)}
.icon-quality{background:rgba(33,150,243,.1)}
.icon-scatter{background:rgba(0,150,136,.1)}
.icon-security{background:rgba(96,125,139,.1)}
.card h3{font-size:18px;font-weight:700;margin-bottom:10px;color:#1a1a2e}
.card p{font-size:14px;color:#666;line-height:1.7}

/* ---------- Solutions Grid ---------- */
.solutions-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
@media (max-width:900px){.solutions-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.solutions-grid{grid-template-columns:1fr}}
.solution-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:32px;transition:all .3s;position:relative;overflow:hidden}
.solution-card:hover{transform:translateY(-4px);background:rgba(255,255,255,.08);border-color:rgba(67,97,238,.4)}
.solution-num{font-size:48px;font-weight:900;color:rgba(67,97,238,.15);position:absolute;top:16px;right:24px;line-height:1}
.solution-card h3{font-size:20px;font-weight:700;margin-bottom:10px;color:#fff}
.solution-card p{font-size:14px;color:rgba(255,255,255,.6);line-height:1.7}

/* ---------- Scenarios ---------- */
.scenarios-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
@media (max-width:900px){.scenarios-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.scenarios-grid{grid-template-columns:1fr}}
.scenario-item{text-align:center;padding:32px 24px;border-radius:16px;border:1px solid #eee;transition:all .3s}
.scenario-item:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.08);border-color:transparent}
.scenario-icon{font-size:40px;margin-bottom:16px}
.scenario-item h3{font-size:18px;font-weight:700;margin-bottom:8px}
.scenario-item p{font-size:14px;color:#666;line-height:1.6}

/* ---------- Footer ---------- */
.footer{background:#0a0a1a;color:rgba(255,255,255,.6);padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;padding-bottom:40px}
@media (max-width:900px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.footer-grid{grid-template-columns:1fr}.footer-grid{gap:24px}}
.footer-col h4{color:#fff;font-size:15px;font-weight:600;margin-bottom:16px;letter-spacing:.5px}
.footer-col a,.footer-col span{display:block;font-size:14px;margin-bottom:10px;transition:color .3s;line-height:1.6}
.footer-col a:hover{color:#7b9bff}
.footer-logo{font-size:20px;font-weight:800;color:#fff;letter-spacing:-.3px;background:linear-gradient(135deg,#4361ee,#3a0ca3);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.footer-desc{margin-top:12px;font-size:14px;line-height:1.7;max-width:220px}
.footer-phone{display:inline-block!important;margin-top:16px;font-size:17px;font-weight:700;color:#7b9bff!important}
.footer-qrcodes{display:flex;gap:16px;margin-top:4px}
.qrcode-item{text-align:center}
.qrcode-item img{width:90px;height:90px;border-radius:8px;display:block;margin-bottom:6px;border:1px solid rgba(255,255,255,.1)}
.qrcode-item span{font-size:12px;color:rgba(255,255,255,.45)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:20px 0;text-align:center;font-size:14px}
.footer-icp{margin-top:6px}
.footer-icp a{color:rgba(255,255,255,.45);font-size:13px;transition:color .3s}
.footer-icp a:hover{color:#7b9bff}

/* ============================================
   About Page Styles
   ============================================ */

/* Page Hero */
.page-hero{background:linear-gradient(135deg,#0f0f23,#1a1a3e);color:#fff;padding:120px 0 64px;text-align:center}
.page-hero h1{font-size:42px;font-weight:900;margin-bottom:16px}
.page-hero p{font-size:18px;color:rgba(255,255,255,.65);max-width:600px;margin:0 auto}
@media (max-width:768px){.page-hero h1{font-size:32px}.page-hero p{font-size:16px}}

/* Why AI Grid */
.why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
@media (max-width:768px){.why-grid{grid-template-columns:1fr}}
.why-card{display:flex;gap:20px;padding:32px;border-radius:16px;border:1px solid #eee;transition:all .3s}
.why-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.08);border-color:transparent}
.why-icon{font-size:40px;flex-shrink:0;width:64px;height:64px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,rgba(67,97,238,.08),rgba(58,12,163,.08));border-radius:14px}
.why-content h3{font-size:18px;font-weight:700;margin-bottom:8px;color:#1a1a2e}
.why-content p{font-size:14px;color:#666;margin-bottom:8px;line-height:1.7}
.why-content p:last-child{margin-bottom:0}

/* Pain Points Grid */
.pain-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
@media (max-width:768px){.pain-grid{grid-template-columns:1fr}}
.pain-card{display:flex;gap:20px;padding:28px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:14px;transition:all .3s}
.pain-card:hover{background:rgba(255,255,255,.07);border-color:rgba(67,97,238,.3);transform:translateY(-2px)}
.pain-num{font-size:32px;font-weight:900;color:rgba(67,97,238,.3);flex-shrink:0;line-height:1}
.pain-body h3{font-size:17px;font-weight:700;color:#fff;margin-bottom:8px}
.pain-body p{font-size:14px;color:rgba(255,255,255,.6);line-height:1.7}

/* Sub sections */
.sub-section{margin-bottom:56px}
.sub-section:last-child{margin-bottom:0}
.sub-title{font-size:22px;font-weight:700;color:#1a1a2e;margin-bottom:28px;display:flex;align-items:center;gap:12px}
.sub-title::before{content:'';width:4px;height:24px;background:linear-gradient(135deg,#4361ee,#3a0ca3);border-radius:2px}
@media (max-width:768px){.sub-title{font-size:18px}}

/* Solution Detail Grid */
.solution-detail-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
@media (max-width:900px){.solution-detail-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.solution-detail-grid{grid-template-columns:1fr}}
.detail-card{padding:28px;border-radius:14px;border:1px solid #eee;transition:all .3s}
.detail-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.08);border-color:transparent}
.detail-icon{font-size:32px;margin-bottom:14px}
.detail-card h4{font-size:17px;font-weight:700;margin-bottom:12px;color:#1a1a2e}
.detail-card ul{list-style:none}
.detail-card li{font-size:14px;color:#666;padding:5px 0;padding-left:18px;position:relative;line-height:1.6}
.detail-card li::before{content:'•';position:absolute;left:0;color:#4361ee;font-weight:700}

/* Value Grid */
.value-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
@media (max-width:900px){.value-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.value-grid{grid-template-columns:1fr}}
.value-card{text-align:center;padding:28px 20px;border-radius:14px;border:1px solid #eee;transition:all .3s}
.value-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.08);border-color:transparent}
.value-icon{font-size:36px;margin-bottom:14px}
.value-card h4{font-size:17px;font-weight:700;margin-bottom:10px;color:#1a1a2e}
.value-card p{font-size:14px;color:#666;line-height:1.7}

/* Goals List */
.goals-list{max-width:800px;margin:0 auto}
.goal-item{display:flex;gap:20px;padding:24px;margin-bottom:16px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:14px;transition:all .3s}
.goal-item:last-child{margin-bottom:0}
.goal-item:hover{background:rgba(255,255,255,.07);border-color:rgba(67,97,238,.3)}
.goal-check{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#4361ee,#3a0ca3);color:#fff;border-radius:10px;font-size:20px;font-weight:700;flex-shrink:0;margin-top:2px}
.goal-content h3{font-size:18px;font-weight:700;color:#fff;margin-bottom:6px}
.goal-content p{font-size:14px;color:rgba(255,255,255,.6);line-height:1.7}

/* CTA actions */
.cta-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ---------- Animations ---------- */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.animate{opacity:0}
.animate.visible{animation:fadeInUp .6s ease forwards}