/* 首页介绍页 */
*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#2d7ff9;--primary-dark:#1c6fe0;--text:#22303f;--sub:#68788a;--border:#e8edf3;--bg:#f6f9fc}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:#fff;line-height:1.6}
.inner{max-width:1080px;margin:0 auto;padding:0 24px}
a{text-decoration:none;color:inherit}
h2{font-size:28px;text-align:center;margin-bottom:8px}
.sec-sub{text-align:center;color:var(--sub);font-size:14px;margin-bottom:36px}

/* 按钮 */
.btn{display:inline-block;padding:9px 22px;border-radius:8px;font-size:14px;cursor:pointer;transition:.2s;text-align:center}
.btn.solid{background:var(--primary);color:#fff}
.btn.solid:hover{background:var(--primary-dark)}
.btn.ghost{border:1px solid var(--border);color:var(--text);background:#fff}
.btn.ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn.big{padding:13px 34px;font-size:16px}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.nav .inner{height:64px;display:flex;align-items:center;gap:32px}
.nav .brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700}
.nav .brand img{height:32px}
.nav .links{display:flex;gap:26px;font-size:14px;color:var(--sub);flex:1}
.nav .links a:hover{color:var(--primary)}
.nav .actions{display:flex;gap:12px;align-items:center}

/* Hero */
.hero{background:linear-gradient(160deg,#eef5ff 0%,#f8fbff 55%,#fff 100%);padding:88px 0 72px;text-align:center}
.hero h1{font-size:42px;line-height:1.35;font-weight:700}
.hero h1 em{font-style:normal;color:var(--primary)}
.hero .sub{max-width:640px;margin:22px auto 0;color:var(--sub);font-size:16px}
.hero .sub b{color:var(--primary)}
.hero .cta{margin-top:34px;display:flex;gap:16px;justify-content:center}
.hero .meta{margin-top:20px;font-size:13px;color:#93a3b3}

/* 功能 */
.features{padding:80px 0 40px;background:#fff}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid .card{border:1px solid var(--border);border-radius:12px;padding:28px 24px;transition:.2s}
.grid .card:hover{box-shadow:0 8px 24px rgba(31,45,61,.08);transform:translateY(-3px)}
.grid .ico{font-size:30px}
.grid h3{font-size:17px;margin:14px 0 8px}
.grid p{font-size:13.5px;color:var(--sub)}

/* 流程 */
.steps{padding:60px 0;background:var(--bg)}
.flow{display:flex;align-items:center;justify-content:center;gap:26px;flex-wrap:wrap}
.step{background:#fff;border-radius:12px;padding:26px 30px;text-align:center;min-width:200px;box-shadow:0 2px 10px rgba(31,45,61,.05)}
.step .no{display:inline-flex;width:34px;height:34px;border-radius:50%;background:var(--primary);color:#fff;align-items:center;justify-content:center;font-weight:700}
.step h3{font-size:16px;margin:12px 0 6px}
.step p{font-size:13px;color:var(--sub)}
.arrow{font-size:24px;color:#b9c6d4}

/* 价格 */
.pricing{padding:84px 0;background:linear-gradient(180deg,#fff 0%,#f7fafe 100%)}
.plans{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;align-items:stretch}

/* 卡片基础 */
.plan{position:relative;display:flex;flex-direction:column;background:#fff;border:1px solid var(--border);border-radius:16px;padding:30px 22px 26px;text-align:center;cursor:pointer;outline:none;
      transition:transform .28s cubic-bezier(.2,.8,.3,1),box-shadow .28s,border-color .28s}
.plan::before{content:"";position:absolute;left:0;right:0;top:0;height:4px;border-radius:16px 16px 0 0;
      background:linear-gradient(90deg,#4aa3ff,#2d7ff9 55%,#6c5ce7);opacity:0;transition:opacity .28s}
.plan:hover{transform:translateY(-5px);box-shadow:0 14px 34px rgba(31,45,61,.10)}
.plan.free{background:#fafbfd}

/* 选中特效 */
.plan.selected{transform:translateY(-10px) scale(1.02);border-color:var(--primary);
      box-shadow:0 22px 46px rgba(45,127,249,.20),0 0 0 3px rgba(45,127,249,.12)}
.plan.selected::before{opacity:1}
.plan.selected .p-check{opacity:1;transform:scale(1)}
.plan.selected .p-head h3{color:var(--primary)}
.plan.selected .p-price b{background:linear-gradient(90deg,#2d7ff9,#6c5ce7);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.plan.selected .btn{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 8px 20px rgba(45,127,249,.28)}
.plan.selected .btn:hover{background:var(--primary-dark)}

/* 右上角选中标记 */
.p-check{position:absolute;top:14px;right:14px;width:24px;height:24px;border-radius:50%;background:var(--primary);opacity:0;transform:scale(.4);
      transition:opacity .26s,transform .26s cubic-bezier(.2,1.4,.4,1)}
.p-check::after{content:"";position:absolute;left:8px;top:5px;width:6px;height:11px;border:2px solid #fff;border-top:0;border-left:0;transform:rotate(42deg)}

/* 徽章 */
.p-badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:#e6f0ff;color:var(--primary);font-size:12px;
      padding:4px 14px;border-radius:20px;white-space:nowrap}
.p-badge.hot{background:linear-gradient(90deg,#2d7ff9,#6c5ce7);color:#fff;box-shadow:0 6px 16px rgba(45,127,249,.32)}

/* 内容 */
.p-head h3{font-size:17px;font-weight:600;color:var(--text);transition:color .25s}
.p-tag{font-size:12.5px;color:#8f9dac;margin-top:6px;min-height:36px}
.p-price{margin:16px 0 6px;color:var(--text);display:flex;align-items:baseline;justify-content:center;gap:2px}
.p-price .cur{font-size:18px;font-weight:600}
.p-price b{font-size:40px;line-height:1.1;font-weight:700}
.p-sub{font-size:12.5px;color:#93a3b3;min-height:20px}
.p-list{list-style:none;margin:18px 0 22px;padding-top:16px;border-top:1px dashed var(--border);text-align:left;flex:1}
.p-list li{font-size:13.5px;color:var(--sub);padding:7px 0 7px 24px;position:relative}
.p-list li::before{content:"";position:absolute;left:2px;top:11px;width:13px;height:7px;border:2px solid #22a06b;border-top:0;border-right:0;transform:rotate(-45deg)}
.p-act .btn{width:100%;display:block;border:1px solid var(--border);background:#fff;color:var(--text);transition:all .25s}
.p-act .btn:hover{border-color:var(--primary);color:var(--primary)}
.p-note{text-align:center;margin-top:34px;font-size:13px;color:#93a3b3}

@media (prefers-reduced-motion:reduce){
  .plan,.p-check{transition:none}
}

/* 页脚 */
.foot{border-top:1px solid var(--border);padding:26px 0 30px;background:#fbfcfe}
.foot .copy{text-align:center;font-size:12px;color:#93a3b3}
.foot .copy a{color:#93a3b3}
.foot .copy a:hover{color:var(--primary)}

/* 移动端 */
@media (max-width:1000px){
    .grid{grid-template-columns:repeat(2,1fr)}
    .plans{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
    .hero h1{font-size:28px}
    .hero{padding:56px 0 48px}
    .grid{grid-template-columns:1fr}
    .plans{grid-template-columns:1fr}
    .nav .links{display:none}
    .arrow{transform:rotate(90deg)}
}