/* ===== meimodu妹魔都 官网落地页样式 ===== */
:root{
  --primary:#ff4d88;
  --primary-light:#ffdbe8;
  --primary-grad:linear-gradient(135deg,#ff6ba0,#ff4d88);
  --bg:#fff6fa;
  --card:#ffffff;
  --text:#2b2430;
  --text-sub:#8d7b88;
  --border:#ffe3ee;
  --radius:18px;
  --radius-sm:12px;
  --shadow:0 8px 26px rgba(255,77,136,.10);
  --shadow-hover:0 16px 38px rgba(255,77,136,.20);
  --maxw:1180px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:78px}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;cursor:pointer}
input{font-family:inherit}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad-text{background:var(--primary-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ===== 顶部导航 ===== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:999;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
}
.nav.scrolled{box-shadow:0 4px 18px rgba(255,77,136,.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{font-size:24px;font-weight:800;color:var(--text);letter-spacing:.5px}
.logo span{color:var(--primary);margin-left:6px}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{
  font-size:15px;color:var(--text-sub);transition:color .25s;position:relative;
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;
  background:var(--primary);border-radius:2px;transition:width .25s;
}
.nav-links a:hover,.nav-links a.active{color:var(--primary)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:none;border-radius:999px;font-weight:700;letter-spacing:.5px;
  transition:transform .25s,box-shadow .25s;cursor:pointer;
}
.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-sm{padding:7px 18px;font-size:14px}
.btn-lg{padding:16px 42px;font-size:18px}
.btn-primary{color:#fff;background:var(--primary-grad);box-shadow:var(--shadow)}
.btn-ghost{color:var(--primary);background:#fff;border:2px solid var(--primary)}

/* ===== 卡片通用 ===== */
.step-card,.feature-card,.compare-card,.stat-card,.persona-card,.review-card,.privacy-card,.update-card,.vs-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);
  transition:transform .3s,box-shadow .3s;
}
.step-card:hover,.feature-card:hover,.compare-card:hover,.stat-card:hover,.persona-card:hover,.review-card:hover,.privacy-card:hover{
  transform:translateY(-6px);box-shadow:var(--shadow-hover);
}
.features,.compare,.stats,.personas,.reviews,.privacy{display:grid;gap:22px}

/* ===== 首屏 Hero ===== */
.hero{padding:150px 0 90px;background:
  radial-gradient(600px 400px at 15% 10%,rgba(255,77,136,.08),transparent 60%),
  radial-gradient(700px 500px at 90% 20%,rgba(255,107,160,.10),transparent 60%),
  linear-gradient(180deg,#fff2f7,#fff6fa);
}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-badge{
  display:inline-block;padding:6px 16px;border-radius:999px;font-size:13px;font-weight:600;
  color:var(--primary);background:var(--primary-light);margin-bottom:18px;
}
.hero-text h1{font-size:46px;line-height:1.25;font-weight:800;letter-spacing:.5px}
.hero-desc{margin:22px 0 26px;font-size:17px;color:var(--text-sub);max-width:560px}
.persona-chips{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:34px}
.persona-chips span{
  font-size:13px;padding:7px 14px;border-radius:999px;background:#fff;
  border:1px solid var(--border);color:var(--text-sub);
}

/* 聊天窗口 */
.hero-chat{display:flex;flex-direction:column;align-items:center}
.chat{
  width:100%;max-width:400px;background:#fff;border-radius:24px;
  box-shadow:0 20px 50px rgba(255,77,136,.16);overflow:hidden;
  border:1px solid var(--border);
}
.chat-head{
  display:flex;align-items:center;gap:12px;padding:14px 18px;
  background:var(--primary-grad);color:#fff;
}
.chat-avatar{width:42px;height:42px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.6)}
.chat-user{flex:1;line-height:1.3}
.chat-user strong{font-size:15px;display:block}
.chat-user span{font-size:12px;opacity:.9;display:flex;align-items:center;gap:5px}
.chat-user .dot{width:7px;height:7px;border-radius:50%;background:#7dffb0;display:inline-block}
.chat-dots{font-size:18px;letter-spacing:2px}
.chat-body{padding:16px 14px;background:#f7f8fb;height:340px;overflow:hidden;display:flex;flex-direction:column;gap:12px}
.msg-time{text-align:center;font-size:11px;color:#a6a6b2}
.msg{display:flex;gap:9px;align-items:flex-end}
.msg img{width:30px;height:30px;border-radius:50%;object-fit:cover;flex-shrink:0}
.msg .bubble{padding:10px 14px;max-width:76%;font-size:14px}
.msg-ai .bubble{background:#fff;color:var(--text);border-radius:14px 14px 14px 4px;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.msg-me{justify-content:flex-end}
.msg-me .bubble{background:var(--primary-grad);color:#fff;border-radius:14px 14px 4px 14px;box-shadow:0 2px 8px rgba(255,77,136,.18)}
.typing{display:flex;align-items:center;gap:4px;font-size:12px;color:#a6a6b2;padding-left:39px}
.typing span{width:5px;height:5px;border-radius:50%;background:#c4c4d0;animation:blink 1.2s infinite}
.typing span:nth-child(2){animation-delay:.2s}
.typing span:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.3}40%{opacity:1}}
.chat-foot{
  display:flex;align-items:center;gap:10px;padding:12px 14px;background:#fff;
  border-top:1px solid var(--border);
}
.cf-emoji{font-size:18px;cursor:pointer}
.chat-foot input{
  flex:1;border:none;background:#f2f3f7;border-radius:999px;padding:9px 16px;font-size:13px;outline:none;
}
.cf-send{
  width:34px;height:34px;border-radius:50%;border:none;color:#fff;
  background:var(--primary-grad);font-size:14px;display:flex;align-items:center;justify-content:center;
}
.hero-note{margin-top:16px;font-size:13px;color:var(--text-sub)}

/* ===== 通用区块 ===== */
.section{padding:90px 0}
.section-alt{background:#fff}
.sec-head{text-align:center;margin-bottom:52px}
.sec-tag{
  display:inline-block;padding:5px 16px;border-radius:999px;font-size:13px;font-weight:600;
  color:var(--primary);background:var(--primary-light);margin-bottom:14px;
}
.sec-head h2{font-size:34px;font-weight:800;letter-spacing:.5px}
.sec-head p{color:var(--text-sub);margin-top:10px;font-size:15px}

/* 三步上手 */
.steps{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:20px;align-items:stretch}
.step-card{padding:34px 26px}
.step-num{
  display:inline-block;font-size:15px;font-weight:800;color:var(--primary);
  background:var(--primary-light);border-radius:10px;padding:4px 12px;margin-bottom:18px;
}
.step-card h3{font-size:19px;margin-bottom:10px}
.step-card p{color:var(--text-sub);font-size:14px}
.step-arrow{display:flex;align-items:center;color:var(--primary);font-size:24px;font-weight:700}

/* 产品介绍 */
.product-inner{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:center}
.product-img img{border-radius:24px;box-shadow:var(--shadow-hover)}
.product-text .sec-tag{margin-bottom:14px}
.product-text h2{font-size:32px;font-weight:800;line-height:1.4;margin-bottom:18px}
.product-text p{color:var(--text-sub);margin-bottom:14px;font-size:15px}
.product-points{margin-top:10px}
.product-points li{font-size:15px;padding:7px 0;color:var(--text)}

/* 核心功能 */
.features{grid-template-columns:repeat(4,1fr)}
.feature-card{padding:30px 24px}
.f-icon{
  display:inline-flex;width:56px;height:56px;align-items:center;justify-content:center;
  font-size:26px;border-radius:16px;background:var(--primary-light);margin-bottom:18px;
}
.feature-card h3{font-size:19px;margin-bottom:10px}
.f-pain{font-size:13px;color:var(--primary);background:#fff3f7;border-radius:10px;padding:8px 12px;margin-bottom:12px;line-height:1.6}
.f-desc{font-size:14px;color:var(--text-sub)}

/* 优势对比 */
.compare{grid-template-columns:repeat(3,1fr);align-items:stretch}
.compare-card{padding:30px 26px;position:relative}
.compare-card h3{font-size:18px;margin-bottom:18px;text-align:center}
.compare-card li,.vs-card li{position:relative;padding-left:26px;font-size:14px;color:var(--text-sub)}
.compare-card li{padding-top:9px;padding-bottom:9px}
.vs-card li{padding-top:7px;padding-bottom:7px}
.compare-card li::before,.vs-card li::before{position:absolute;left:0}
.compare-card li::before{top:9px;font-size:15px}
.vs-card li::before{top:7px;font-size:14px}
.compare-card li.no::before,.vs-card li.no::before{content:"✕";color:#c9c9d6}
.compare-card li.yes::before,.vs-card li.yes::before{content:"✓";color:#3ccf8e;font-weight:800}
.compare-card.hot{
  border:2px solid var(--primary);box-shadow:var(--shadow-hover);
  transform:scale(1.02);
}
.compare-card.hot h3{color:var(--primary)}
.compare-card.hot li{color:var(--text)}
.hot-badge{
  position:absolute;top:-14px;left:50%;transform:translateX(-50%);
  background:var(--primary-grad);color:#fff;font-size:12px;font-weight:600;
  padding:4px 16px;border-radius:999px;white-space:nowrap;
}

/* 使用场景 */
.scenario-inner{display:grid;grid-template-columns:1.25fr .75fr;gap:32px;align-items:stretch}
.scenario-list{display:flex;flex-direction:column;gap:14px}
.scenario-list li{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:16px 20px;font-size:15px;box-shadow:var(--shadow);
  transition:transform .3s,box-shadow .3s;
}
.scenario-list li:hover{transform:translateX(6px);box-shadow:var(--shadow-hover)}
.vs-card{padding:28px 26px}
.vs-card h3{font-size:17px;text-align:center;margin-bottom:12px}
.vs-card h3.vs-win{color:var(--primary);margin-top:6px}
.vs-divider{
  display:block;text-align:center;font-size:13px;font-weight:800;color:#fff;
  background:var(--primary-grad);border-radius:999px;width:44px;height:44px;line-height:44px;
  margin:14px auto;
}

/* 数据 */
.stats{grid-template-columns:repeat(4,1fr)}
.stat-card{padding:34px 20px;text-align:center}
.stat-card strong{display:block;font-size:34px;font-weight:800;margin-bottom:8px}
.stat-card span{font-size:14px;color:var(--text-sub)}

/* 人设定制 */
.personas{grid-template-columns:repeat(3,1fr)}
.persona-card{overflow:hidden;text-align:center;position:relative}
.p-img{height:230px;overflow:hidden}
.p-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.persona-card:hover .p-img img{transform:scale(1.06)}
.persona-card h3{font-size:18px;margin:18px 0 6px}
.persona-card p{font-size:14px;color:var(--text-sub);padding:0 20px 22px}
.persona-card.custom{border:2px solid var(--primary)}
.custom-badge{
  position:absolute;top:14px;right:14px;z-index:2;
  background:var(--primary-grad);color:#fff;font-size:12px;font-weight:600;
  padding:4px 12px;border-radius:999px;
}

/* 用户评价 */
.reviews{grid-template-columns:repeat(3,1fr)}
.review-card{padding:26px 24px}
.r-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.r-avatar{
  width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:var(--primary-grad);color:#fff;font-size:19px;font-weight:700;flex-shrink:0;
}
.r-info strong{display:block;font-size:15px}
.r-stars{color:#ffb400;font-size:13px;letter-spacing:1px}
.review-card p{font-size:14px;color:var(--text-sub)}

/* 隐私安全 */
.privacy{grid-template-columns:repeat(4,1fr)}
.privacy-card{padding:30px 24px;text-align:center}
.p-icon{font-size:30px;display:block;margin-bottom:14px}
.privacy-card h3{font-size:17px;margin-bottom:10px}
.privacy-card p{font-size:13px;color:var(--text-sub)}

/* 版本更新 */
.update-card{padding:34px;max-width:760px;margin:0 auto}
.update-top{display:flex;align-items:center;justify-content:space-between;border-bottom:1px dashed var(--border);padding-bottom:16px;margin-bottom:18px;flex-wrap:wrap;gap:8px}
.update-top h3{font-size:20px;color:var(--primary)}
.update-top span{font-size:13px;color:var(--text-sub)}
.update-list li{padding:10px 0;font-size:15px;color:var(--text);border-bottom:1px solid #fff0f5;display:flex;gap:10px;align-items:baseline}
.update-list li:last-child{border-bottom:none}
.update-list li span{
  flex-shrink:0;font-size:12px;font-weight:600;color:#fff;
  background:var(--primary-grad);border-radius:6px;padding:2px 10px;
}

/* FAQ */
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;
  background:none;border:none;padding:20px 24px;font-size:16px;font-weight:600;color:var(--text);text-align:left;
}
.faq-icon{color:var(--primary);font-size:20px;transition:transform .3s;flex-shrink:0}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a div{padding:0 24px 22px;font-size:14px;color:var(--text-sub)}

/* 下载区域 */
.download{
  background:radial-gradient(600px 400px at 50% 0%,rgba(255,77,136,.12),transparent 65%),
  linear-gradient(180deg,#fff0f6,#fff6fa);
}
.download-inner{text-align:center}
.download-inner h1{font-size:42px;font-weight:800;margin-bottom:16px}
.dl-meta{font-size:14px;color:var(--text-sub);margin-bottom:30px}
.dl-btns{display:flex;justify-content:center;gap:20px;margin-bottom:22px;flex-wrap:wrap}
.dl-tip{font-size:15px;color:var(--primary);font-weight:600}

/* 页脚 */
.footer{border-top:1px solid var(--border);background:#fff;padding:34px 0}
.footer-inner{text-align:center}
.footer-inner p{font-size:14px;color:var(--text-sub)}
.footer-inner a{color:var(--text-sub);transition:color .25s}
.footer-inner a:hover{color:var(--primary)}
.footer-sub{margin-top:6px;font-size:12px}

/* 返回顶部 */
.to-top{
  position:fixed;right:28px;bottom:32px;z-index:998;width:46px;height:46px;border-radius:50%;
  border:none;color:#fff;background:var(--primary-grad);font-size:20px;
  box-shadow:var(--shadow-hover);opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s,transform .3s;
}
.to-top.show{opacity:1;visibility:visible}
.to-top:hover{transform:translateY(-4px)}

/* ===== 响应式 ===== */
@media(max-width:1100px){
  .nav-links{gap:18px}
  .nav-links a:nth-child(2),.nav-links a:nth-child(5){display:none}
  .features{grid-template-columns:repeat(2,1fr)}
  .privacy{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero-text{text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .persona-chips{justify-content:center}
  .hero{padding:130px 0 70px}
  .product-inner{grid-template-columns:1fr;gap:36px}
  .scenario-inner{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr;gap:16px}
  .step-arrow{justify-content:center;transform:rotate(90deg)}
  .compare{grid-template-columns:1fr;max-width:520px;margin:0 auto}
  .compare-card.hot{transform:none}
  .reviews{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .personas{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .container{padding:0 20px}
  html{scroll-padding-top:64px}
  .nav-inner{height:58px}
  .logo{font-size:20px}
  .nav-links{display:none}
  .section{padding:64px 0}
  .sec-head{margin-bottom:36px}
  .sec-head h2{font-size:26px}
  .hero{padding:110px 0 60px}
  .hero-text h1{font-size:30px}
  .hero-desc{font-size:15px}
  .btn-lg{padding:14px 34px;font-size:16px;width:100%;max-width:340px}
  .hero-text .btn-lg{margin:0 auto}
  .chat{max-width:100%}
  .chat-body{height:320px}
  .features{grid-template-columns:1fr}
  .product-text h2{font-size:26px}
  .scenario-list li{font-size:14px}
  .reviews{grid-template-columns:1fr}
  .stats{gap:14px}
  .stat-card strong{font-size:26px}
  .personas{grid-template-columns:1fr;max-width:400px;margin:0 auto}
  .p-img{height:260px}
  .privacy{grid-template-columns:1fr;max-width:400px;margin:0 auto}
  .download-inner h1{font-size:28px}
  .dl-btns{flex-direction:column;align-items:center;gap:14px}
  .dl-btns .btn{width:100%;max-width:340px}
  .dl-meta{font-size:12px;white-space:nowrap}
  .faq-q{font-size:15px;padding:18px 18px}
  .faq-a div{padding:0 18px 20px}
  .to-top{right:16px;bottom:24px;width:42px;height:42px}
  .hero-note{font-size:12px}
}