/* ===== 通用样式（三个站点共用，品牌色用 :root 变量覆盖） ===== */
:root{
  --brand:#4f46e5; --brand2:#7c3aed; --ink:#1e293b; --muted:#64748b;
  --line:#e2e8f0; --bg:#f8fafc; --card:#ffffff; --ok:#16a34a; --warn:#d97706;
  --grad:linear-gradient(135deg,var(--brand),var(--brand2));
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-text-size-adjust:100%}
img{max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}

/* 顶栏 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1040px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.logo{font-weight:800;font-size:19px;display:flex;align-items:center;gap:8px}
.logo .dot{width:10px;height:10px;border-radius:50%;background:var(--grad);display:inline-block}
.menu{display:flex;gap:18px;align-items:center;font-size:14px;color:var(--muted)}
.menu a:hover{color:var(--brand)}
.menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;font-size:18px;padding:4px 10px;cursor:pointer}
@media(max-width:860px){
  .menu-toggle{display:block}
  .menu{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;padding:8px 0;gap:0}
  .menu.open{display:flex}
  .menu a{display:block;padding:10px 16px;width:100%;border-top:1px solid #f1f5f9}
}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;cursor:pointer;border-radius:10px;padding:12px 20px;font-size:15px;font-weight:600;line-height:1.2;transition:transform .1s,box-shadow .2s,opacity .2s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 6px 16px rgba(79,70,229,.25)}
.btn-primary:hover{opacity:.92}
.btn-ghost{background:#fff;color:var(--brand);border:1.5px solid var(--brand)}
.btn-light{background:#fff;color:var(--brand)}
.btn-block{width:100%}
.btn-sm{padding:7px 12px;font-size:13px;border-radius:8px}

/* Hero */
.hero{background:var(--grad);color:#fff;padding:64px 0 76px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-80px;top:-80px;width:300px;height:300px;border-radius:50%;background:rgba(255,255,255,.12)}
.hero::before{content:"";position:absolute;left:-60px;bottom:-120px;width:260px;height:260px;border-radius:50%;background:rgba(0,0,0,.08)}
.hero .wrap{position:relative;z-index:1}
.eyebrow{display:inline-block;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.35);padding:4px 12px;border-radius:999px;font-size:13px;margin-bottom:16px}
.hero h1{font-size:38px;line-height:1.25;letter-spacing:.5px}
.hero-sub{margin-top:14px;font-size:16px;opacity:.92;max-width:640px}
.hero-actions{margin-top:24px;display:flex;gap:12px;flex-wrap:wrap}
.hero-note{margin-top:18px;font-size:13px;opacity:.85}
.stats{display:flex;gap:32px;margin-top:34px;flex-wrap:wrap}
.stat b{font-size:24px;display:block}
.stat small{font-size:13px;opacity:.9}
@media(max-width:640px){ .hero{padding:44px 0 56px} .hero h1{font-size:29px} .stats{gap:18px} }

/* 通用 section */
.section{padding:52px 0}
.section.gray{background:#fff}
.section-head{text-align:center;margin-bottom:34px}
.section-title{font-size:27px}
.section-sub{color:var(--muted);margin-top:8px;font-size:15px}
.tag{display:inline-block;font-size:12px;padding:2px 10px;border-radius:999px;background:rgba(79,70,229,.1);color:var(--brand);margin:2px}

/* 卡片网格 */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid.cols2{grid-template-columns:repeat(2,1fr)}
@media(max-width:860px){ .grid,.grid.cols2{grid-template-columns:repeat(2,1fr)} }
@media(max-width:600px){ .grid,.grid.cols2{grid-template-columns:1fr} }
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;transition:box-shadow .2s,transform .2s}
.card:hover{box-shadow:0 10px 24px rgba(15,23,42,.07);transform:translateY(-2px)}
.card .ico{width:46px;height:46px;border-radius:12px;background:rgba(79,70,229,.1);display:flex;align-items:center;justify-content:center;font-size:23px;margin-bottom:12px}
.card h3{font-size:17px;margin-bottom:6px}
.card p{color:var(--muted);font-size:14px}
.price-row{margin-top:12px;font-weight:800;color:var(--brand)}
.price-row small{font-weight:400;color:var(--muted)}

/* 价格套餐 */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;align-items:stretch}
@media(max-width:860px){.plans{grid-template-columns:1fr;max-width:420px;margin:0 auto}}
.plan{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;display:flex;flex-direction:column;gap:10px;position:relative}
.plan.hot{border:2px solid var(--brand);box-shadow:0 12px 30px rgba(79,70,229,.15)}
.plan .pname{font-weight:800;font-size:18px}
.plan .pdesc{color:var(--muted);font-size:13px;min-height:38px}
.plan .pprice{font-size:30px;font-weight:900;color:var(--brand)}
.plan .pprice small{font-size:14px;color:var(--muted);font-weight:400}
.plan ul{list-style:none;font-size:14px;color:var(--ink)}
.plan ul li{padding:5px 0 5px 24px;position:relative}
.plan ul li::before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800}
.hot-flag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:12px;padding:3px 12px;border-radius:999px;font-weight:600}
.plan .btn{margin-top:6px}

/* AI 演示区 */
.demo{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;max-width:760px;margin:0 auto}
.demo label{font-weight:600;font-size:14px;display:block;margin:14px 0 6px}
.demo textarea,.demo input[type=text],.demo select{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 12px;font-size:14px;font-family:inherit;background:#fff;color:var(--ink);outline:none}
.demo textarea:focus,.demo input[type=text]:focus,.demo select:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,70,229,.12)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}
.chip{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:6px 13px;font-size:13px;cursor:pointer;color:var(--muted);transition:all .15s}
.chip:hover{border-color:var(--brand);color:var(--brand)}
.chip.on{background:var(--grad);border-color:transparent;color:#fff}
.demo-actions{margin-top:16px;display:flex;gap:10px;flex-wrap:wrap}
.demo-hint{font-size:12px;color:var(--muted);margin-top:8px}

/* 结果区 */
.result{margin-top:18px;background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:16px;display:none}
.result.show{display:block;animation:fadeIn .25s}
.result h4{font-size:14px;color:var(--brand);margin:12px 0 4px}
.result h4:first-child{margin-top:0}
.result p,.result li{font-size:14px;color:var(--ink)}
.result ul{padding-left:20px}
.reply-box{background:#fff;border:1px dashed #c7d2fe;border-radius:10px;padding:12px 14px;font-size:15px;position:relative;white-space:pre-wrap}
.copy-btn{position:absolute;top:10px;right:10px;font-size:12px;background:#eef2ff;color:var(--brand);border:none;border-radius:7px;padding:4px 9px;cursor:pointer}
.mini-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:8px}
.mini-grid .mini{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px}
.mini b{display:block;font-size:14px;margin-bottom:4px}
.mini li{font-size:13px;margin-left:16px;color:var(--muted)}
@media(max-width:640px){.mini-grid{grid-template-columns:1fr 1fr}}
.typing{color:var(--brand);font-size:13px;margin-top:10px;display:none}
.typing.show{display:block}

/* 步骤 */
.steps{counter-reset:st;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:860px){.steps{grid-template-columns:1fr}}
.step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;position:relative}
.step::before{counter-increment:st;content:counter(st);position:absolute;top:-14px;left:16px;width:30px;height:30px;border-radius:50%;background:var(--grad);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:15px}
.step h4{margin-bottom:6px;padding-top:8px}
.step p{color:var(--muted);font-size:14px}

/* FAQ */
.faq{max-width:760px;margin:0 auto}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}
summary{cursor:pointer;font-weight:600;font-size:15px}
details p,details li{margin-top:8px;color:var(--muted);font-size:14px}

/* 下单区 */
.order-cta{background:var(--grad);color:#fff;border-radius:20px;padding:38px 26px;text-align:center}
.order-cta h2{font-size:26px}
.order-cta p{margin-top:8px;opacity:.92;font-size:15px}
.order-box{background:#fff;border-radius:14px;max-width:560px;margin:20px auto 0;padding:16px;text-align:left}
.order-box .reply-box{background:#fff}
.order-fields{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.order-fields input{flex:1;min-width:180px;border:1px solid var(--line);border-radius:9px;padding:9px 11px;font-size:14px;font-family:inherit}
footer{border-top:1px solid var(--line);padding:26px 0;color:var(--muted);font-size:13px;text-align:center;background:#fff}
.tip{font-size:12px;color:var(--muted);margin-top:10px}
.badge-src{font-size:12px;color:var(--muted)}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.notice{background:#fffbeb;border:1px solid #fde68a;color:#92400e;border-radius:12px;padding:10px 14px;font-size:13px;margin:0 0 14px}
.checklist li{margin:6px 0 6px 18px;font-size:14px;color:var(--muted)}

/* 收款下单三步 */
.order-cta select#planSel{flex:1;min-width:150px;border:1px solid var(--line);border-radius:9px;padding:9px;font-size:14px;font-family:inherit;background:#fff;color:var(--ink)}
.pay-steps{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.pay-step{flex:1;min-width:140px;background:#f0fdfa;border:1px dashed #99f6e4;border-radius:10px;padding:8px 10px;font-size:13px;color:#0f766e;text-align:center;font-weight:600}
.pay-step b{display:block;font-size:17px}
.pay-panel{display:none;margin-top:14px;background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:14px;animation:fadeIn .3s}
.pay-panel.show{display:block}
.pay-divider{text-align:center;font-weight:800;color:#92400e;font-size:14px;margin-bottom:10px}
.pay-row{display:flex;gap:14px;align-items:stretch;flex-wrap:wrap}
.pay-info{flex:1;min-width:230px;background:#fff;border:1px solid #fde68a;border-radius:10px;padding:12px;font-size:14px}
.pay-line{margin:4px 0;color:#1e293b}
.pay-amount{color:#dc2626;font-size:20px}
.pay-no{color:#92400e;font-family:Consolas,monospace;letter-spacing:.5px}
.copy-btn-static{font-size:12px;background:#fef3c7;border:1px solid #fcd34d;color:#92400e;border-radius:7px;padding:2px 8px;cursor:pointer;margin-left:6px}
.pay-warn{margin-top:8px;font-size:12px;color:#b45309;background:#fffbeb;border-radius:8px;padding:6px 8px}
.pay-qr{width:170px;text-align:center}
.qr-placeholder{width:150px;height:150px;margin:0 auto;border:2px dashed #f59e0b;border-radius:10px;background:#fff;color:#d97706;font-size:13px;display:flex;align-items:center;justify-content:center;text-align:center;line-height:1.5;font-weight:700}
.pay-qr img{width:150px;height:150px;border-radius:10px;border:1px solid var(--line);object-fit:contain;background:#fff}
.pay-qr-tip{margin-top:6px;font-size:12px;color:#92400e}
.pay-tip{margin-top:10px;color:#92400e}
@media(max-width:560px){.pay-row{flex-direction:column-reverse}.pay-qr{width:100%}}