*{margin:0;padding:0;box-sizing:border-box}
:root{
  --blue:#1256d0;
  --blue-deep:#0a2f7a;
  --blue-light:#3b82f6;
  --blue-glow:#4f9bff;
  --bg-soft:#f4f8ff;
  --text:#1a2333;
  --text-soft:#5a6784;
  --line:#e2eaf8;
  --white:#fff;
  --shadow:0 10px 30px rgba(18,86,208,.10);
  --shadow-hover:0 18px 44px rgba(18,86,208,.20);
  --radius:16px;
}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",system-ui,-apple-system,sans-serif;
  color:var(--text);background:var(--white);line-height:1.7;-webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:80px 0}
.section-soft{background:var(--bg-soft)}
.sec-head{text-align:center;margin-bottom:48px}
.sec-head .eyebrow{display:inline-block;font-size:13px;letter-spacing:2px;color:var(--blue);font-weight:600;background:rgba(18,86,208,.08);padding:6px 16px;border-radius:30px;margin-bottom:16px}
.sec-head h2{font-size:32px;font-weight:800;color:var(--blue-deep);line-height:1.3}
.sec-head h2 span{color:var(--blue)}
.sec-head p{margin-top:14px;color:var(--text-soft);font-size:15px;max-width:720px;margin-left:auto;margin-right:auto}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 30px;border-radius:50px;font-weight:600;font-size:15px;transition:.3s;cursor:pointer;border:none;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--blue-light));color:#fff;box-shadow:0 8px 22px rgba(18,86,208,.32)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 32px rgba(18,86,208,.45)}
.btn-ghost{background:transparent;color:var(--blue);border:2px solid var(--blue)}
.btn-ghost:hover{background:var(--blue);color:#fff;transform:translateY(-3px)}
.btn-white{background:#fff;color:var(--blue);box-shadow:0 8px 22px rgba(0,0,0,.12)}
.btn-white:hover{transform:translateY(-3px)}
/* ============ 导航 ============ */
.header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);transition:.3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo-wrap{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--blue-deep);font-size:20px}
.logo-wrap .ai-page-logo{height:38px;width:auto;max-width:150px}
.nav{display:flex;align-items:center}
.nav-links{display:flex;align-items:center;gap:0;list-style:none}
.nav-links li a{display:block;padding:10px 14px;color:var(--text);font-size:14.5px;font-weight:500;border-radius:8px;transition:.25s;position:relative}
.nav-links li a:hover{color:var(--blue);background:rgba(18,86,208,.06)}
.nav-cta{display:flex;align-items:center;gap:10px}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px;background:none;border:none}
.nav-toggle span{width:24px;height:2.5px;background:var(--blue-deep);border-radius:2px;transition:.3s}
/* ============ Hero ============ */
.hero{position:relative;background:linear-gradient(135deg,#04205e 0%,#0a3aa8 45%,#1256d0 100%);color:#fff;padding:110px 0 120px;overflow:hidden}
.hero::before{content:"";position:absolute;top:-200px;right:-160px;width:560px;height:560px;border-radius:50%;background:radial-gradient(circle,rgba(79,155,255,.45),transparent 65%);pointer-events:none}
.hero::after{content:"";position:absolute;bottom:-220px;left:-160px;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(59,130,246,.30),transparent 65%);pointer-events:none}
.hero-grid-bg{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:48px 48px;pointer-events:none;mask-image:radial-gradient(circle at center,#000 30%,transparent 85%)}
.hero-inner{position:relative;z-index:2;max-width:920px;margin:0 auto;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);padding:7px 18px;border-radius:40px;font-size:13.5px;margin-bottom:26px;backdrop-filter:blur(6px)}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:#6ee7b7;box-shadow:0 0 10px #6ee7b7;animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{font-size:46px;line-height:1.25;font-weight:800;letter-spacing:1px;margin-bottom:22px}
.hero h1 .hl{color:#8ec6ff;text-shadow:0 0 30px rgba(142,198,255,.5)}
.hero-sub{font-size:17px;color:rgba(255,255,255,.85);max-width:720px;margin:0 auto 36px;line-height:1.9}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:46px}
.hero-btns .btn{padding:15px 38px;font-size:16px}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;max-width:820px;margin:0 auto}
.hero-stat{background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.18);border-radius:14px;padding:20px 12px;backdrop-filter:blur(8px);transition:.3s}
.hero-stat:hover{background:rgba(255,255,255,.18);transform:translateY(-4px)}
.hero-stat .num{font-size:28px;font-weight:800;color:#8ec6ff}
.hero-stat .lbl{font-size:13px;color:rgba(255,255,255,.78);margin-top:4px}
/* ============ 数据指标 ============ */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.metric-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px 26px;text-align:center;box-shadow:var(--shadow);transition:.35s}
.metric-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:var(--blue-light)}
.metric-card .m-num{font-size:40px;font-weight:800;background:linear-gradient(135deg,var(--blue),var(--blue-light));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1.1}
.metric-card .m-lbl{font-size:15px;font-weight:600;margin-top:10px;color:var(--blue-deep)}
.metric-card .m-desc{font-size:13px;color:var(--text-soft);margin-top:6px}
/* ============ 关于我们/平台介绍 ============ */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.about-text h2{font-size:32px;font-weight:800;color:var(--blue-deep);margin-bottom:20px}
.about-text h2 span{color:var(--blue)}
.about-text p{color:var(--text-soft);font-size:15.5px;margin-bottom:16px}
.about-points{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:26px}
.about-points li{display:flex;align-items:center;gap:10px;font-size:14.5px;font-weight:500;color:var(--text)}
.about-points li::before{content:"✓";flex:0 0 22px;width:22px;height:22px;border-radius:50%;background:rgba(18,86,208,.12);color:var(--blue);font-weight:800;display:flex;align-items:center;justify-content:center;font-size:12px}
.about-img-wrap{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.about-img-wrap img{border-radius:var(--radius);box-shadow:var(--shadow);transition:.35s;width:100%;object-fit:cover}
.about-img-wrap img:first-child{grid-column:1/3;height:240px}
.about-img-wrap img:nth-child(2),.about-img-wrap img:nth-child(3){height:180px}
.about-img-wrap img:hover{transform:scale(1.02);box-shadow:var(--shadow-hover)}
/* ============ 服务能力卡片 ============ */
.cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.svc-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;transition:.35s;position:relative;overflow:hidden;box-shadow:0 4px 16px rgba(18,86,208,.05)}
.svc-card::before{content:"";position:absolute;top:0;left:0;width:100%;height:4px;background:linear-gradient(90deg,var(--blue),var(--blue-light));transform:scaleX(0);transform-origin:left;transition:.4s}
.svc-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-hover);border-color:transparent}
.svc-card:hover::before{transform:scaleX(1)}
.svc-icon{width:54px;height:54px;border-radius:14px;background:linear-gradient(135deg,rgba(18,86,208,.12),rgba(59,130,246,.18));display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:24px}
.svc-card h3{font-size:19px;font-weight:700;color:var(--blue-deep);margin-bottom:10px}
.svc-card p{font-size:14px;color:var(--text-soft);line-height:1.8}
/* ============ 一站式制作 标签云 ============ */
.tag-cloud{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;max-width:1000px;margin:0 auto}
.tag-item{background:#fff;border:1px solid var(--line);color:var(--blue-deep);padding:10px 20px;border-radius:40px;font-size:14px;font-weight:500;transition:.3s;cursor:default;box-shadow:0 2px 8px rgba(18,86,208,.04)}
.tag-item:hover{background:var(--blue);color:#fff;border-color:var(--blue);transform:translateY(-3px);box-shadow:0 8px 20px rgba(18,86,208,.3)}
.tag-item.hot{background:linear-gradient(135deg,var(--blue),var(--blue-light));color:#fff;border-color:transparent}
/* ============ 行业方案 ============ */
.scene-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.scene-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 22px;transition:.35s;box-shadow:0 4px 14px rgba(18,86,208,.05)}
.scene-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:var(--blue-light)}
.scene-card .s-icon{font-size:26px;margin-bottom:12px}
.scene-card h4{font-size:16px;font-weight:700;color:var(--blue-deep);margin-bottom:8px}
.scene-card p{font-size:13.5px;color:var(--text-soft);line-height:1.75}
/* ============ 服务网络 ============ */
.network-wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.network-card{background:linear-gradient(160deg,#fff,#f4f8ff);border:1px solid var(--line);border-radius:var(--radius);padding:32px 26px;transition:.35s;box-shadow:var(--shadow)}
.network-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.network-card h3{font-size:18px;color:var(--blue-deep);font-weight:700;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.network-card p{font-size:14px;color:var(--text-soft);line-height:1.85}
.network-list{list-style:none;margin-top:16px;display:flex;flex-wrap:wrap;gap:8px}
.network-list li{font-size:12.5px;background:rgba(18,86,208,.08);color:var(--blue);padding:5px 12px;border-radius:20px}
/* ============ 流程步骤 ============ */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;counter-reset:step}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px 18px;text-align:center;transition:.35s}
.step:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:var(--blue-light)}
.step .s-num{counter-increment:step;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--blue-light));color:#fff;font-size:19px;font-weight:800;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;box-shadow:0 6px 16px rgba(18,86,208,.3)}
.step .s-num::before{content:counter(step,decimal-leading-zero)}
.step h4{font-size:15.5px;color:var(--blue-deep);margin-bottom:6px}
.step p{font-size:13px;color:var(--text-soft);line-height:1.7}
/* ============ 案例中心 ============ */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.35s;box-shadow:0 6px 20px rgba(18,86,208,.06)}
.case-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-hover)}
.case-card img{width:100%;height:200px;object-fit:cover;transition:.4s}
.case-card:hover img{transform:scale(1.06)}
.case-body{padding:22px}
.case-body .c-tag{font-size:12px;color:var(--blue);background:rgba(18,86,208,.09);padding:4px 12px;border-radius:20px;display:inline-block;margin-bottom:10px}
.case-body h3{font-size:17px;font-weight:700;color:var(--blue-deep);margin-bottom:8px}
.case-body p{font-size:13.5px;color:var(--text-soft);line-height:1.75}
/* ============ 对比评测 ============ */
.compare-wrap{background:#fff;border-radius:20px;box-shadow:var(--shadow);overflow:hidden;border:1px solid var(--line)}
.eval-banner{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:20px;background:linear-gradient(135deg,var(--blue-deep),var(--blue));color:#fff;padding:34px 32px;align-items:center}
.eval-banner .e-main h3{font-size:24px;font-weight:800;margin-bottom:6px}
.eval-banner .e-main p{font-size:14px;color:rgba(255,255,255,.8)}
.eval-score{text-align:center;background:rgba(255,255,255,.12);border-radius:14px;padding:18px;backdrop-filter:blur(6px)}
.eval-score .num{font-size:38px;font-weight:800;color:#ffd76e;line-height:1.1}
.eval-score .lbl{font-size:13px;color:rgba(255,255,255,.85);margin-top:4px}
.eval-stars{text-align:center;background:rgba(255,255,255,.12);border-radius:14px;padding:18px;backdrop-filter:blur(6px)}
.eval-stars .stars{font-size:22px;color:#ffd76e;letter-spacing:3px}
.eval-stars .lbl{font-size:13px;color:rgba(255,255,255,.85);margin-top:6px}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.compare{width:100%;border-collapse:collapse;min-width:680px}
table.compare th,table.compare td{padding:16px 20px;text-align:left;font-size:14.5px;border-bottom:1px solid var(--line)}
table.compare thead th{background:#f0f6ff;color:var(--blue-deep);font-weight:700;font-size:14px}
table.compare thead th:first-child{width:26%}
table.compare tbody tr:hover{background:#f8fbff}
table.compare td:first-child{font-weight:600;color:var(--blue-deep)}
table.compare .good{color:var(--blue);font-weight:600}
table.compare .star-cell{color:#f5a623}
/* ============ 价格/Token比价 ============ */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.price-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;transition:.35s;position:relative;box-shadow:0 4px 16px rgba(18,86,208,.05);display:flex;flex-direction:column}
.price-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.price-card.featured{border:2px solid var(--blue);box-shadow:0 12px 34px rgba(18,86,208,.18)}
.price-card .p-badge{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,var(--blue),var(--blue-light));color:#fff;font-size:12px;padding:4px 16px;border-radius:20px;font-weight:600;white-space:nowrap}
.price-card h3{font-size:18px;color:var(--blue-deep);font-weight:700;margin-bottom:8px;text-align:center}
.price-card .p-desc{font-size:13px;color:var(--text-soft);text-align:center;margin-bottom:20px}
.price-card .p-val{text-align:center;font-size:32px;font-weight:800;background:linear-gradient(135deg,var(--blue),var(--blue-light));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:4px}
.price-card .p-unit{text-align:center;font-size:12.5px;color:var(--text-soft);margin-bottom:22px}
.price-list{list-style:none;margin-bottom:26px;flex:1}
.price-list li{font-size:13.5px;color:var(--text-soft);padding:8px 0 8px 26px;position:relative}
.price-list li::before{content:"✓";position:absolute;left:0;color:var(--blue);font-weight:800}
.price-card .btn{width:100%}
.token-note{margin-top:28px;text-align:center;font-size:13.5px;color:var(--text-soft)}
.token-note a{color:var(--blue);font-weight:600}
/* ============ 用户评论 ============ */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;transition:.35s;box-shadow:0 4px 16px rgba(18,86,208,.05);display:flex;flex-direction:column}
.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:var(--blue-light)}
.review-stars{color:#f5a623;font-size:15px;letter-spacing:2px;margin-bottom:14px}
.review-text{font-size:14px;color:var(--text);line-height:1.85;flex:1;margin-bottom:20px}
.review-user{display:flex;align-items:center;gap:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--blue-light));color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:16px;flex:0 0 44px}
.review-user .u-name{font-size:14px;font-weight:700;color:var(--blue-deep)}
.review-user .u-role{font-size:12.5px;color:var(--text-soft)}
/* ============ FAQ ============ */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:14px;overflow:hidden;transition:.3s}
.faq-item:hover{border-color:var(--blue-light);box-shadow:0 6px 18px rgba(18,86,208,.08)}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;cursor:pointer;font-weight:600;font-size:15.5px;color:var(--blue-deep);user-select:none}
.faq-q .ic{flex:0 0 26px;width:26px;height:26px;border-radius:50%;background:rgba(18,86,208,.09);color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:16px;transition:.3s;font-weight:700}
.faq-item.active .faq-q .ic{transform:rotate(45deg);background:var(--blue);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.faq-a p{font-size:14px;color:var(--text-soft);line-height:1.85;padding-bottom:20px}
/* ============ 文章列表 ============ */
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.article-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;transition:.35s;box-shadow:0 4px 14px rgba(18,86,208,.05)}
.article-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:var(--blue-light)}
.article-card .a-date{font-size:12.5px;color:var(--blue);font-weight:600;margin-bottom:10px}
.article-card h4{font-size:16px;color:var(--blue-deep);font-weight:700;margin-bottom:10px;line-height:1.5}
.article-card p{font-size:13.5px;color:var(--text-soft);line-height:1.75;margin-bottom:14px}
.article-card .a-more{font-size:13.5px;color:var(--blue);font-weight:600}
.article-card .a-more:hover{text-decoration:underline}
/* ============ 表单 ============ */
.form-wrap{display:grid;grid-template-columns:1fr 1.2fr;gap:48px;align-items:start}
.form-info h2{font-size:30px;font-weight:800;color:var(--blue-deep);margin-bottom:16px}
.form-info h2 span{color:var(--blue)}
.form-info p{font-size:15px;color:var(--text-soft);margin-bottom:24px;line-height:1.85}
.contact-list{list-style:none;display:flex;flex-direction:column;gap:16px}
.contact-list li{display:flex;align-items:flex-start;gap:14px;font-size:14.5px;color:var(--text)}
.contact-list .ci{flex:0 0 40px;width:40px;height:40px;border-radius:12px;background:rgba(18,86,208,.09);display:flex;align-items:center;justify-content:center;font-size:18px}
.contact-list .ci-text b{display:block;font-size:12.5px;color:var(--text-soft);font-weight:500;margin-bottom:1px}
.contact-list .ci-text a{color:var(--blue-deep);font-weight:600;word-break:break-all}
.contact-list .ci-text a:hover{color:var(--blue)}
.qr-box{margin-top:24px}
.qr-box img{width:140px;height:140px;border-radius:12px;border:1px solid var(--line);object-fit:cover}
.qr-box p{font-size:12.5px;color:var(--text-soft);margin-top:8px}
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px 34px;box-shadow:var(--shadow)}
.form-card h3{font-size:21px;font-weight:800;color:var(--blue-deep);margin-bottom:6px}
.form-card .f-sub{font-size:13.5px;color:var(--text-soft);margin-bottom:24px}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:13.5px;font-weight:600;color:var(--blue-deep);margin-bottom:8px}
.form-group label .req{color:#e53e3e}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:13px 16px;border:1.5px solid var(--line);border-radius:10px;font-size:14px;font-family:inherit;color:var(--text);background:#fafcff;transition:.25s;outline:none}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--blue);background:#fff;box-shadow:0 0 0 4px rgba(18,86,208,.10)}
.form-group textarea{resize:vertical;min-height:110px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-card .btn{width:100%;margin-top:6px}
.form-msg{display:none;margin-top:14px;padding:12px 16px;border-radius:10px;font-size:13.5px;background:rgba(18,86,208,.08);color:var(--blue)}
/* ============ 加盟/培训 ============ */
.join-wrap{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center}
.join-text h2{font-size:30px;font-weight:800;color:var(--blue-deep);margin-bottom:16px}
.join-text h2 span{color:var(--blue)}
.join-text p{font-size:15px;color:var(--text-soft);line-height:1.85;margin-bottom:18px}
.join-benefits{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
.join-benefits .j-item{display:flex;gap:10px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;transition:.3s}
.join-benefits .j-item:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--blue-light)}
.join-benefits .j-item .ji{flex:0 0 36px;width:36px;height:36px;border-radius:10px;background:rgba(18,86,208,.09);display:flex;align-items:center;justify-content:center;font-size:17px}
.join-benefits .j-item b{font-size:14px;color:var(--blue-deep);display:block;margin-bottom:2px}
.join-benefits .j-item span{font-size:12.5px;color:var(--text-soft);line-height:1.6}
.join-img img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%}
/* ============ 时间线 ============ */
.timeline{position:relative;max-width:820px;margin:0 auto;padding-left:36px}
.timeline::before{content:"";position:absolute;left:11px;top:6px;bottom:6px;width:2px;background:linear-gradient(var(--blue),var(--blue-light))}
.tl-item{position:relative;padding-bottom:32px}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{content:"";position:absolute;left:-31px;top:5px;width:14px;height:14px;border-radius:50%;background:#fff;border:3px solid var(--blue);box-shadow:0 0 0 4px rgba(18,86,208,.12)}
.tl-item .tl-year{font-size:13px;font-weight:700;color:var(--blue);margin-bottom:4px}
.tl-item h4{font-size:16.5px;color:var(--blue-deep);margin-bottom:6px}
.tl-item p{font-size:13.5px;color:var(--text-soft);line-height:1.75}
/* ============ 友情链接 ============ */
.friend-links{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.friend-links a{background:#fff;border:1px solid var(--line);color:var(--text-soft);padding:9px 20px;border-radius:40px;font-size:13.5px;transition:.3s}
.friend-links a:hover{background:var(--blue);color:#fff;border-color:var(--blue);transform:translateY(-2px)}
/* ============ 页脚 ============ */
.footer{background:#061a44;color:rgba(255,255,255,.72);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.footer-brand .fb-logo{display:flex;align-items:center;gap:10px;margin-bottom:18px;color:#fff;font-weight:800;font-size:20px}
.footer-brand .fb-logo .ai-page-logo{height:38px;width:auto;max-width:150px;filter:brightness(0) invert(1)}
.footer-brand p{font-size:13.5px;line-height:1.85;margin-bottom:18px}
.footer-brand .fb-contact{font-size:13.5px;line-height:2}
.footer-brand .fb-contact a{color:#8ec6ff}
.footer-col h4{color:#fff;font-size:15px;font-weight:700;margin-bottom:18px}
.footer-col ul{list-style:none}
.footer-col ul li{margin-bottom:11px}
.footer-col ul li a{font-size:13.5px;color:rgba(255,255,255,.66);transition:.25s}
.footer-col ul li a:hover{color:#8ec6ff;padding-left:4px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.10);margin-top:48px;padding:24px 0;text-align:center;font-size:12.5px;color:rgba(255,255,255,.5);line-height:1.8}
/* ============ 浮动客服/返回顶部 ============ */
.float-tools{position:fixed;right:20px;bottom:28px;z-index:900;display:flex;flex-direction:column;gap:12px}
.float-btn{width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--blue-light));color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;box-shadow:0 8px 22px rgba(18,86,208,.35);transition:.3s;border:none;position:relative}
.float-btn:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(18,86,208,.5)}
.float-btn .fb-tip{position:absolute;right:62px;top:50%;transform:translateY(-50%);background:#061a44;color:#fff;font-size:12.5px;padding:6px 12px;border-radius:8px;white-space:nowrap;opacity:0;pointer-events:none;transition:.25s}
.float-btn:hover .fb-tip{opacity:1}
.float-btn .fb-qr{position:absolute;right:62px;bottom:0;background:#fff;padding:8px;border-radius:12px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.25s;transform:translateX(6px)}
.float-btn .fb-qr img{width:120px;height:120px;border-radius:8px;object-fit:cover}
.float-btn:hover .fb-qr{opacity:1;pointer-events:auto;transform:translateX(0)}
#backTop{opacity:0;pointer-events:none;transition:.3s}
#backTop.show{opacity:1;pointer-events:auto}
/* ============ 动画 ============ */
.reveal{opacity:0;transform:translateY(36px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:translateY(0)}
/* ============ 响应式 ============ */
@media(max-width:1024px){
  .hero h1{font-size:38px}
  .cards-grid,.scene-grid,.review-grid,.article-grid,.case-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr)}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .price-grid{grid-template-columns:1fr;max-width:520px;margin:0 auto}
  .network-wrap{grid-template-columns:1fr}
  .about-grid,.form-wrap,.join-wrap{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .eval-banner{grid-template-columns:1fr 1fr}
  .eval-banner .e-main{grid-column:1/3}
}
@media(max-width:768px){
  .section{padding:56px 0}
  .sec-head h2{font-size:26px}
  .hero{padding:80px 0 90px}
  .hero h1{font-size:29px;letter-spacing:0}
  .hero-sub{font-size:15px}
  .hero-btns .btn{padding:13px 26px;font-size:14.5px;flex:1;min-width:150px}
  .hero-stats{grid-template-columns:1fr 1fr;gap:12px}
  .hero-stat .num{font-size:23px}
  .cards-grid,.scene-grid,.review-grid,.article-grid,.case-grid,.steps{grid-template-columns:1fr}
  .metrics{grid-template-columns:1fr 1fr;gap:14px}
  .metric-card{padding:26px 16px}
  .metric-card .m-num{font-size:30px}
  .about-points{grid-template-columns:1fr}
  .about-img-wrap{grid-template-columns:1fr 1fr}
  .about-img-wrap img:first-child{height:180px}
  .about-img-wrap img:nth-child(2),.about-img-wrap img:nth-child(3){height:130px}
  .form-row{grid-template-columns:1fr}
  .form-card{padding:26px 22px}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .join-benefits{grid-template-columns:1fr}
  .eval-banner{grid-template-columns:1fr;padding:26px 22px}
  .eval-banner .e-main{grid-column:auto}
  .nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow);padding:12px 16px;max-height:calc(100vh - 72px);overflow-y:auto}
  .nav.open{display:block}
  .nav-links{flex-direction:column;gap:0;width:100%}
  .nav-links li{width:100%}
  .nav-links li a{padding:13px 12px;border-radius:10px;font-size:15px}
  .nav-toggle{display:flex}
  .nav-toggle.active span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
  .nav-toggle.active span:nth-child(2){opacity:0}
  .nav-toggle.active span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
  .nav-cta .btn{padding:9px 18px;font-size:13.5px}
  .float-tools{right:14px;bottom:18px}
  .float-btn{width:46px;height:46px;font-size:18px}
  .logo-wrap{font-size:17px}
  .logo-wrap .ai-page-logo{height:32px}
  table.compare th,table.compare td{padding:13px 14px;font-size:13.5px}
}
@media(max-width:420px){
  .hero h1{font-size:25px}
  .hero-stats{grid-template-columns:1fr}
  .metrics{grid-template-columns:1fr}
}