/* ===== LingoLoop 落地页样式（独立，不依赖 styles.css） ===== */
:root{
  --indigo:#6366f1; --violet:#8b5cf6; --cyan:#22d3ee; --ink:#0f172a;
  --muted:#64748b; --line:#e6e8ee; --panel:#fff; --bg:#f7f8fc;
  --brand-grad:linear-gradient(120deg,#6366f1 0%,#8b5cf6 50%,#22d3ee 100%);
  --soft-grad:linear-gradient(180deg,#f5f3ff 0%,#eef6ff 100%);
  --radius:18px; --shadow:0 10px 40px rgba(30,27,75,.08); --shadow-lg:0 24px 60px rgba(80,40,200,.18);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;font-family:-apple-system,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;}
a{color:inherit;text-decoration:none;}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px;}
.grad-text{background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;color:transparent;}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:999px;font-weight:700;font-size:15px;cursor:pointer;border:none;transition:.2s;}
.btn-primary{background:var(--brand-grad);color:#fff;box-shadow:0 8px 24px rgba(99,102,241,.35);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(99,102,241,.45);}
.btn-ghost{background:#fff;color:var(--indigo);border:1.5px solid #d9d6ff;}
.btn-ghost:hover{border-color:var(--indigo);}
.btn-lg{padding:16px 34px;font-size:16px;}
.btn-block{width:100%;justify-content:center;}
.eyebrow{display:inline-flex;align-items:center;gap:6px;background:#eef2ff;color:var(--indigo);font-weight:700;font-size:13px;padding:6px 14px;border-radius:999px;}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:20px;}
.brand .dot{width:34px;height:34px;border-radius:11px;background:var(--brand-grad);display:grid;place-items:center;color:#fff;font-size:18px;box-shadow:0 6px 16px rgba(99,102,241,.4);}
.nav-links{display:flex;align-items:center;gap:28px;}
.nav-links a{color:var(--muted);font-weight:600;font-size:15px;}
.nav-links a:hover{color:var(--indigo);}
.nav-cta{display:flex;align-items:center;gap:12px;}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px;}
.burger span{width:24px;height:2.5px;background:var(--ink);border-radius:2px;}
.mobile-menu{display:none;flex-direction:column;gap:4px;padding:12px 20px 20px;background:#fff;border-bottom:1px solid var(--line);}
.mobile-menu a{padding:12px 4px;font-weight:600;color:var(--ink);border-bottom:1px solid #f1f1f6;}

/* Hero */
.hero{position:relative;overflow:hidden;background:var(--soft-grad);padding:72px 0 60px;}
.hero::before{content:"";position:absolute;width:680px;height:680px;border-radius:50%;background:radial-gradient(circle,rgba(139,92,246,.18),transparent 60%);top:-240px;right:-160px;}
.hero::after{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(34,211,238,.16),transparent 60%);bottom:-220px;left:-140px;}
.hero-inner{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;}
.hero h1{font-size:52px;line-height:1.12;margin:18px 0 18px;font-weight:900;letter-spacing:-.5px;}
.hero p.lead{font-size:18px;line-height:1.7;color:var(--muted);margin:0 0 28px;}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;}
.hero-trust{margin-top:22px;display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:13.5px;}
.hero-trust span{display:inline-flex;align-items:center;gap:6px;}
.hero-trust b{color:var(--indigo);}

/* Hero 视觉卡 */
.hero-visual{position:relative;}
.phone{background:#0f1226;border-radius:34px;padding:14px;box-shadow:var(--shadow-lg);border:1px solid #2a2f55;position:relative;z-index:2;}
.phone-screen{background:linear-gradient(180deg,#1a1f3d,#11142b);border-radius:24px;padding:18px;height:440px;display:flex;flex-direction:column;justify-content:space-between;overflow:hidden;}
.phone-top{display:flex;justify-content:space-between;align-items:center;color:#cbd5e1;font-size:12px;}
.bubble{font-size:13.5px;padding:10px 13px;border-radius:14px;max-width:82%;line-height:1.45;}
.bubble.ai{background:#262c4f;color:#e2e8f0;align-self:flex-start;border-bottom-left-radius:4px;}
.bubble.me{background:var(--brand-grad);color:#fff;align-self:flex-end;border-bottom-right-radius:4px;}
.bubble.tip{background:#14323a;color:#7fe3f0;align-self:flex-start;font-size:12px;border:1px solid #1f5b66;}
.float-card{position:absolute;z-index:3;background:#fff;border-radius:16px;padding:12px 16px;box-shadow:var(--shadow);display:flex;align-items:center;gap:10px;font-weight:700;font-size:14px;}
.float-card .ic{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-size:18px;}
.fc1{top:24px;left:-26px;animation:float 5s ease-in-out infinite;}
.fc2{bottom:36px;right:-22px;animation:float 6s ease-in-out infinite reverse;}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

/* 统计条 */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;margin:-40px auto 0;position:relative;z-index:5;max-width:1040px;}
.stat{text-align:center;}
.stat .num{font-size:34px;font-weight:900;}
.stat .lbl{color:var(--muted);font-size:13.5px;margin-top:4px;}

/* 通用 section */
section.block{padding:80px 0;}
.section-head{text-align:center;max-width:680px;margin:0 auto 46px;}
.section-head h2{font-size:36px;font-weight:900;margin:14px 0 12px;letter-spacing:-.5px;}
.section-head p{color:var(--muted);font-size:16.5px;line-height:1.7;margin:0;}

/* 痛点对比 */
.pain{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;align-items:stretch;margin-top:10px;}
.pain-col{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;}
.pain-col.bad{border-color:#fecaca;background:#fff5f5;}
.pain-col h4{margin:0 0 14px;font-size:17px;}
.pain-col ul{list-style:none;padding:0;margin:0;}
.pain-col li{padding:9px 0;border-bottom:1px dashed var(--line);color:#475569;font-size:14.5px;display:flex;gap:8px;}
.pain-col.bad li{color:#b91c1c;}
.pain-vs{display:grid;place-items:center;font-weight:900;color:var(--indigo);font-size:22px;}

/* 功能卡 */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.feat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.25s;position:relative;overflow:hidden;}
.feat:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d9d6ff;}
.feat .ic{width:52px;height:52px;border-radius:14px;background:var(--soft-grad);display:grid;place-items:center;font-size:24px;margin-bottom:16px;}
.feat h3{margin:0 0 8px;font-size:18px;}
.feat p{color:var(--muted);font-size:14.5px;line-height:1.65;margin:0;}

/* 情景展示 */
.scn-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
.scn{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;transition:.2s;cursor:pointer;}
.scn:hover{border-color:var(--indigo);transform:translateY(-3px);box-shadow:var(--shadow);}
.scn .emo{font-size:26px;}
.scn .t{font-weight:800;margin:8px 0 4px;font-size:15.5px;}
.scn .d{color:var(--muted);font-size:12.5px;}
.scn-tags{margin-top:10px;display:flex;flex-wrap:wrap;gap:5px;}
.scn-tags span{background:#eef2ff;color:var(--indigo);font-size:11px;padding:2px 8px;border-radius:999px;}

/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;counter-reset:s;}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;position:relative;}
.step .n{counter-increment:s;width:44px;height:44px;border-radius:13px;background:var(--brand-grad);color:#fff;font-weight:900;font-size:18px;display:grid;place-items:center;margin-bottom:14px;}
.step .n::before{content:counter(s);}
.step h3{margin:0 0 8px;font-size:18px;}
.step p{color:var(--muted);font-size:14.5px;line-height:1.65;margin:0;}

/* 未来科技 */
.future{background:linear-gradient(135deg,#0f1226,#1b1340 60%,#0a2a3a);color:#e2e8f0;border-radius:28px;padding:54px 40px;position:relative;overflow:hidden;}
.future::before{content:"";position:absolute;width:400px;height:400px;border-radius:50%;background:radial-gradient(circle,rgba(139,92,246,.4),transparent 60%);top:-120px;right:-80px;}
.future .section-head h2,.future .section-head p{color:#fff;}
.future .section-head p{color:#b9c0e0;}
.fcards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;position:relative;z-index:2;}
.fcard{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:16px;padding:22px;backdrop-filter:blur(6px);}
.fcard .ic{font-size:24px;}
.fcard h4{margin:10px 0 6px;color:#fff;font-size:16.5px;}
.fcard p{color:#aab2d8;font-size:13.5px;line-height:1.6;margin:0;}
.ribbon{display:inline-block;background:rgba(34,211,238,.18);color:#7fe3f0;border:1px solid rgba(34,211,238,.4);font-size:11px;padding:2px 9px;border-radius:999px;margin-top:10px;}

/* 价格 */
.pricing{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;align-items:stretch;}
.plan{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;display:flex;flex-direction:column;}
.plan.featured{border:2px solid var(--indigo);box-shadow:var(--shadow-lg);position:relative;transform:scale(1.03);}
.plan .tag-best{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--brand-grad);color:#fff;font-weight:800;font-size:12px;padding:5px 16px;border-radius:999px;white-space:nowrap;}
.plan .pname{font-size:17px;font-weight:800;}
.plan .price{font-size:40px;font-weight:900;margin:10px 0 2px;}
.plan .price small{font-size:14px;color:var(--muted);font-weight:500;}
.plan .pdesc{color:var(--muted);font-size:13.5px;min-height:38px;}
.plan ul{list-style:none;padding:0;margin:18px 0;flex:1;}
.plan li{padding:8px 0;font-size:14px;color:#334155;display:flex;gap:8px;align-items:flex-start;}
.plan li .ck{color:var(--indigo);font-weight:900;}
.plan li.off{color:#cbd5e1;}

/* 评价 */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.review{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;}
.review .stars{color:#f59e0b;letter-spacing:2px;}
.review p{color:#334155;font-size:14.5px;line-height:1.7;margin:12px 0;}
.review .who{display:flex;align-items:center;gap:10px;margin-top:8px;}
.review .av{width:38px;height:38px;border-radius:50%;background:var(--soft-grad);display:grid;place-items:center;font-weight:800;color:var(--indigo);}
.review .who b{font-size:14px;}
.review .who span{color:var(--muted);font-size:12.5px;display:block;}

/* FAQ */
.faq{max-width:760px;margin:0 auto;}
.faq-item{border:1px solid var(--line);border-radius:14px;margin-bottom:12px;background:#fff;overflow:hidden;}
.faq-q{display:flex;justify-content:space-between;align-items:center;padding:18px 20px;cursor:pointer;font-weight:700;font-size:15.5px;}
.faq-q .arrow{transition:.25s;color:var(--indigo);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 20px;color:var(--muted);font-size:14.5px;line-height:1.7;}
.faq-item.open .faq-a{padding:0 20px 18px;}
.faq-item.open .arrow{transform:rotate(180deg);}

/* CTA */
.cta-band{background:var(--brand-grad);border-radius:28px;padding:56px 40px;text-align:center;color:#fff;position:relative;overflow:hidden;}
.cta-band h2{font-size:34px;font-weight:900;margin:0 0 12px;}
.cta-band p{font-size:17px;opacity:.92;margin:0 0 26px;}
.cta-band .btn-ghost{background:rgba(255,255,255,.15);color:#fff;border-color:rgba(255,255,255,.5);}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.25);}

/* Footer */
footer{background:#0f1226;color:#cbd5e1;padding:54px 0 30px;margin-top:30px;}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;}
footer h5{color:#fff;font-size:15px;margin:0 0 14px;}
footer a{color:#94a3b8;font-size:14px;display:block;padding:5px 0;}
footer a:hover{color:#fff;}
.foot-brand p{font-size:14px;line-height:1.7;color:#94a3b8;max-width:280px;}
.foot-bottom{border-top:1px solid #232838;margin-top:36px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#7c88a8;}

/* reveal 动画 */
.reveal{opacity:0;transform:translateY(24px);transition:.7s cubic-bezier(.2,.7,.3,1);}
.reveal.in{opacity:1;transform:none;}

/* 响应式 */
@media(max-width:980px){
  .hero-inner{grid-template-columns:1fr;}
  .hero-visual{display:none;}
  .features,.scn-grid,.fcards,.reviews,.pricing{grid-template-columns:1fr 1fr;}
  .pain{grid-template-columns:1fr;}
  .pain-vs{transform:rotate(90deg);}
  .stats{grid-template-columns:1fr 1fr;}
  .plan.featured{transform:none;}
  .foot-grid{grid-template-columns:1fr 1fr;}
}
@media(max-width:640px){
  .nav-links,.nav-cta .btn-ghost{display:none;}
  .burger{display:flex;}
  .hero h1{font-size:36px;}
  .features,.scn-grid,.fcards,.reviews,.pricing,.steps,.stats{grid-template-columns:1fr;}
  .section-head h2{font-size:28px;}
  section.block{padding:54px 0;}
  .future{padding:40px 22px;}
}