/* ============================================
   AI论文助手 — 首页样式
   ============================================ */

/* ---- 全局背景 ---- */
body{background:#06061a}

/* ---- 光球 ---- */
.orb{position:absolute;border-radius:50%;filter:blur(80px);pointer-events:none}

/* ============ Hero ============ */
.hero{position:relative;min-height:100vh;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;overflow:hidden;padding:100px 24px 60px}
.hero-bg{position:absolute;inset:0;z-index:0}
.orb1{width:600px;height:600px;background:rgba(124,58,237,.25);top:-200px;left:-200px;-webkit-animation:orbFloat1 12s ease-in-out infinite;animation:orbFloat1 12s ease-in-out infinite}
.orb2{width:500px;height:500px;background:rgba(37,99,235,.2);bottom:-150px;right:-150px;-webkit-animation:orbFloat2 15s ease-in-out infinite;animation:orbFloat2 15s ease-in-out infinite}
.orb3{width:300px;height:300px;background:rgba(16,185,129,.12);top:40%;left:50%;-webkit-transform:translateX(-50%);transform:translateX(-50%);-webkit-animation:orbFloat3 18s ease-in-out infinite;animation:orbFloat3 18s ease-in-out infinite}
@-webkit-keyframes orbFloat1{0%,100%{-webkit-transform:translate(0,0);transform:translate(0,0)}50%{-webkit-transform:translate(40px,30px);transform:translate(40px,30px)}}
@keyframes orbFloat1{0%,100%{-webkit-transform:translate(0,0);transform:translate(0,0)}50%{-webkit-transform:translate(40px,30px);transform:translate(40px,30px)}}
@-webkit-keyframes orbFloat2{0%,100%{-webkit-transform:translate(0,0);transform:translate(0,0)}50%{-webkit-transform:translate(-30px,-40px);transform:translate(-30px,-40px)}}
@keyframes orbFloat2{0%,100%{-webkit-transform:translate(0,0);transform:translate(0,0)}50%{-webkit-transform:translate(-30px,-40px);transform:translate(-30px,-40px)}}
@-webkit-keyframes orbFloat3{0%,100%{opacity:.6}50%{opacity:1}}
@keyframes orbFloat3{0%,100%{opacity:.6}50%{opacity:1}}

/* 网格线 */
.grid-lines{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);background-size:60px 60px}

.hero-inner{position:relative;z-index:1;text-align:center;max-width:800px}
.hero-badge{display:-webkit-inline-box;display:-webkit-inline-flex;display:inline-flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;gap:8px;padding:6px 16px;border-radius:30px;background:rgba(124,58,237,.15);border:1px solid rgba(124,58,237,.3);color:#a78bfa;font-size:13px;font-weight:500;margin-bottom:28px}
.badge-dot{width:6px;height:6px;border-radius:50%;background:#a78bfa;-webkit-animation:pulse 2s infinite;animation:pulse 2s infinite}
@-webkit-keyframes pulse{0%,100%{opacity:1;-webkit-transform:scale(1);transform:scale(1)}50%{opacity:.5;-webkit-transform:scale(1.4);transform:scale(1.4)}}
@keyframes pulse{0%,100%{opacity:1;-webkit-transform:scale(1);transform:scale(1)}50%{opacity:.5;-webkit-transform:scale(1.4);transform:scale(1.4)}}

.hero-h1{font-size:clamp(40px,6vw,80px);font-weight:800;line-height:1.15;color:#fff;margin-bottom:24px;letter-spacing:-1px}
.hero-p{font-size:clamp(15px,2vw,18px);color:rgba(255,255,255,.55);line-height:1.8;margin-bottom:40px}

.hero-btns{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;gap:16px;-webkit-flex-wrap:wrap;flex-wrap:wrap;margin-bottom:60px}
.btn-primary{display:-webkit-inline-box;display:-webkit-inline-flex;display:inline-flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;gap:8px;padding:14px 32px;border-radius:12px;background:-webkit-linear-gradient(135deg,#7C3AED,#2563EB);background:linear-gradient(135deg,#7C3AED,#2563EB);color:#fff;text-decoration:none;font-size:16px;font-weight:700;box-shadow:0 8px 32px rgba(124,58,237,.4);-webkit-transition:-webkit-transform .25s,box-shadow .25s;transition:transform .25s,box-shadow .25s}
.btn-primary svg{width:18px;height:18px}
.btn-primary:hover{-webkit-transform:translateY(-2px);transform:translateY(-2px);box-shadow:0 12px 40px rgba(124,58,237,.5)}
.btn-ghost{display:-webkit-inline-box;display:-webkit-inline-flex;display:inline-flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;gap:8px;padding:14px 32px;border-radius:12px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.15);color:#fff;text-decoration:none;font-size:16px;font-weight:600;-webkit-transition:all .25s;transition:all .25s}
.btn-ghost svg{width:18px;height:18px}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.25)}
.btn-lg{padding:16px 40px;font-size:17px}

/* 统计 */
.hero-stats{display:-webkit-inline-box;display:-webkit-inline-flex;display:inline-flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;gap:0;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:20px 40px}
.stat-item{text-align:center;padding:0 28px}
.stat-num{display:block;font-size:28px;font-weight:800;color:#fff;line-height:1}
.stat-label{display:block;font-size:13px;color:rgba(255,255,255,.45);margin-top:6px}
.stat-divider{width:1px;height:40px;background:rgba(255,255,255,.1)}

/* 浮动卡片 */
.hero-card{position:absolute;z-index:2;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;gap:12px;padding:14px 18px;background:rgba(15,15,40,.9);border:1px solid rgba(255,255,255,.1);border-radius:14px;box-shadow:0 16px 48px rgba(0,0,0,.4);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);max-width:280px}
.card-left{left:5%;top:35%;-webkit-animation:cardFloat1 6s ease-in-out infinite;animation:cardFloat1 6s ease-in-out infinite}
.card-right{right:5%;bottom:30%;-webkit-animation:cardFloat2 7s ease-in-out infinite;animation:cardFloat2 7s ease-in-out infinite}
@-webkit-keyframes cardFloat1{0%,100%{-webkit-transform:translateY(0);transform:translateY(0)}50%{-webkit-transform:translateY(-12px);transform:translateY(-12px)}}
@keyframes cardFloat1{0%,100%{-webkit-transform:translateY(0);transform:translateY(0)}50%{-webkit-transform:translateY(-12px);transform:translateY(-12px)}}
@-webkit-keyframes cardFloat2{0%,100%{-webkit-transform:translateY(0);transform:translateY(0)}50%{-webkit-transform:translateY(10px);transform:translateY(10px)}}
@keyframes cardFloat2{0%,100%{-webkit-transform:translateY(0);transform:translateY(0)}50%{-webkit-transform:translateY(10px);transform:translateY(10px)}}
.hc-icon{font-size:22px;-webkit-flex-shrink:0;flex-shrink:0}
.hc-title{font-size:13px;font-weight:600;color:#fff;margin-bottom:3px}
.hc-sub{font-size:11px;color:rgba(255,255,255,.45)}
.hc-badge{width:26px;height:26px;border-radius:8px;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;font-size:11px;font-weight:700;-webkit-flex-shrink:0;flex-shrink:0}
.hc-badge.success{background:rgba(16,185,129,.2);color:#34d399}
.hc-badge.purple{background:rgba(124,58,237,.2);color:#a78bfa}

/* ============ 通用Section ============ */
.section-inner{max-width:1200px;margin:0 auto;padding:0 24px}
.section-label{display:inline-block;padding:4px 14px;border-radius:20px;background:rgba(124,58,237,.15);border:1px solid rgba(124,58,237,.25);color:#a78bfa;font-size:12px;font-weight:600;letter-spacing:1px;text-transform:uppercase;margin-bottom:20px}
.section-h2{font-size:clamp(28px,4vw,44px);font-weight:800;color:#fff;line-height:1.2;margin-bottom:16px}
.section-p{font-size:16px;color:rgba(255,255,255,.5);max-width:600px}

/* ============ 功能区 ============ */
.features{padding:100px 0;text-align:center}
.feat-grid{display:-webkit-box;display:-webkit-flex;display:flex;gap:24px;margin-top:56px;-webkit-flex-wrap:wrap;flex-wrap:wrap}
.feat-card{position:relative;-webkit-box-flex:1;-webkit-flex:1;flex:1;min-width:280px;padding:40px 36px;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);border-radius:24px;text-decoration:none;text-align:left;overflow:hidden;-webkit-transition:all .3s;transition:all .3s}
.feat-card:hover{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.15);-webkit-transform:translateY(-4px);transform:translateY(-4px)}
.feat-glow{position:absolute;width:200px;height:200px;border-radius:50%;filter:blur(60px);top:-60px;left:-60px;pointer-events:none;opacity:.5}
.glow-purple{background:rgba(124,58,237,.4)}
.glow-blue{background:rgba(37,99,235,.4)}
.feat-icon-wrap{width:56px;height:56px;border-radius:16px;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;margin-bottom:24px}
.feat-icon-wrap svg{width:28px;height:28px}
.feat-icon-wrap.purple{background:rgba(124,58,237,.2);color:#a78bfa}
.feat-icon-wrap.blue{background:rgba(37,99,235,.2);color:#60a5fa}
.feat-title{font-size:22px;font-weight:700;color:#fff;margin-bottom:14px}
.feat-desc{font-size:15px;color:rgba(255,255,255,.5);line-height:1.75;margin-bottom:24px}
.feat-tags{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-flex-wrap:wrap;flex-wrap:wrap;gap:8px;margin-bottom:28px}
.feat-tags span{padding:4px 12px;border-radius:20px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);color:rgba(255,255,255,.6);font-size:12px}
.feat-arrow{display:-webkit-inline-box;display:-webkit-inline-flex;display:inline-flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;gap:6px;color:#a78bfa;font-size:14px;font-weight:600}
.feat-arrow svg{width:16px;height:16px;-webkit-transition:-webkit-transform .2s;transition:transform .2s}
.feat-card:hover .feat-arrow svg{-webkit-transform:translateX(4px);transform:translateX(4px)}

/* ============ 优势区 ============ */
.advantages{padding:100px 0;border-top:1px solid rgba(255,255,255,.06)}
.adv-grid{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-flex-wrap:wrap;flex-wrap:wrap;gap:2px;margin-top:56px;border:1px solid rgba(255,255,255,.06);border-radius:20px;overflow:hidden}
.adv-item{-webkit-box-flex:0;-webkit-flex:0 0 calc(33.333% - 2px);flex:0 0 calc(33.333% - 2px);padding:36px 32px;background:rgba(255,255,255,.02);-webkit-transition:background .2s;transition:background .2s}
.adv-item:hover{background:rgba(255,255,255,.05)}
.adv-icon{font-size:32px;margin-bottom:16px}
.adv-item h4{font-size:17px;font-weight:700;color:#fff;margin-bottom:10px}
.adv-item p{font-size:14px;color:rgba(255,255,255,.45);line-height:1.7}

/* ============ 流程区 ============ */
.flow{padding:100px 0;text-align:center;border-top:1px solid rgba(255,255,255,.06)}
.flow-steps{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;gap:0;margin-top:56px;-webkit-flex-wrap:wrap;flex-wrap:wrap}
.flow-step{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;gap:20px;padding:28px 36px;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);border-radius:20px;min-width:220px}
.flow-num{font-size:36px;font-weight:900;background:-webkit-linear-gradient(135deg,#7C3AED,#2563EB);background:linear-gradient(135deg,#7C3AED,#2563EB);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;-webkit-flex-shrink:0;flex-shrink:0}
.flow-content h4{font-size:16px;font-weight:700;color:#fff;margin-bottom:6px}
.flow-content p{font-size:13px;color:rgba(255,255,255,.45);line-height:1.6}
.flow-arrow{font-size:24px;color:rgba(255,255,255,.2);padding:0 8px}

/* ============ CTA ============ */
.cta{position:relative;padding:120px 24px;text-align:center;overflow:hidden;border-top:1px solid rgba(255,255,255,.06)}
.cta-bg{position:absolute;inset:0;z-index:0}
.orb-cta1{width:500px;height:500px;background:rgba(124,58,237,.2);top:-200px;left:-100px}
.orb-cta2{width:400px;height:400px;background:rgba(37,99,235,.15);bottom:-150px;right:-100px}
.cta-inner{position:relative;z-index:1;max-width:700px;margin:0 auto}
.cta-h2{font-size:clamp(32px,5vw,56px);font-weight:800;color:#fff;margin-bottom:20px}
.cta-p{font-size:17px;color:rgba(255,255,255,.5);margin-bottom:40px}
.cta-btns{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;gap:16px;-webkit-flex-wrap:wrap;flex-wrap:wrap}

/* ============ 页脚 ============ */
.footer{padding:40px 24px;border-top:1px solid rgba(255,255,255,.06)}
.footer-inner{max-width:1200px;margin:0 auto;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:justify;-webkit-justify-content:space-between;justify-content:space-between;-webkit-flex-wrap:wrap;flex-wrap:wrap;gap:20px}
.footer-links{display:-webkit-box;display:-webkit-flex;display:flex;gap:24px}
.footer-links a{color:rgba(255,255,255,.4);text-decoration:none;font-size:14px;-webkit-transition:color .2s;transition:color .2s}
.footer-links a:hover{color:rgba(255,255,255,.8)}
.footer-copy{color:rgba(255,255,255,.25);font-size:13px}

/* ============ 响应式 ============ */
@media(max-width:1024px){
  .card-left,.card-right{display:none}
  .adv-item{-webkit-box-flex:0;-webkit-flex:0 0 calc(50% - 2px);flex:0 0 calc(50% - 2px)}
}
@media(max-width:768px){
  .hero{padding:90px 20px 50px}
  .hero-stats{padding:16px 20px}
  .stat-item{padding:0 16px}
  .stat-num{font-size:22px}
  .features,.advantages,.flow,.cta{padding:70px 0}
  .adv-item{-webkit-box-flex:0;-webkit-flex:0 0 100%;flex:0 0 100%}
  .flow-steps{-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;flex-direction:column;gap:16px}
  .flow-arrow{-webkit-transform:rotate(90deg);transform:rotate(90deg)}
  .footer-inner{-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;flex-direction:column;text-align:center}
}
@media(max-width:480px){
  .hero-h1{font-size:32px}
  .hero-stats{-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;flex-direction:column;gap:16px}
  .stat-divider{width:60px;height:1px}
}

/* ---- 备案号 ---- */
.footer-beian { margin: 4px 0 0; }
.footer-beian a {
  font-size: 12px;
  color: rgba(255,255,255,.3);
  text-decoration: none;
}
.footer-beian a:hover { color: rgba(255,255,255,.55); text-decoration: underline; }