/* ===== 同城陌约 免费版 官网样式 ===== */
:root{
  --primary:#FF5C8A;
  --primary-deep:#F03D74;
  --primary-soft:#FFE4EE;
  --deep:#2A1A3D;
  --text:#3E2C50;
  --muted:#6F5E7C;
  --bg:#FFF9FB;
  --bg-soft:#FFF0F6;
  --card:#FFFFFF;
  --border:#F4D8E5;
  --green:#2EC57E;
  --radius:18px;
  --shadow:0 10px 30px rgba(240,61,116,.08);
  --shadow-hover:0 18px 42px rgba(240,61,116,.16);
  --nav-h:64px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
.container{max-width:1160px;margin:0 auto;padding:0 32px}
.sec{padding:88px 0}
.sec-alt{background:var(--bg-soft)}
.sec-head{text-align:center;max-width:640px;margin:0 auto 48px}
.sec-head h2{font-size:34px;color:var(--deep);letter-spacing:.5px}
.sec-head p{color:var(--muted);margin-top:10px;font-size:16px}
.sec-head.light h2{color:#fff}
.sec-head.light p{color:#D9C8E8}

/* 卡片通用 */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}

/* 按钮通用 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-weight:600;min-height:44px;padding:0 26px;font-size:15px;transition:transform .25s,box-shadow .25s;box-shadow:var(--shadow)}
.btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.btn-lg{min-height:52px;padding:0 38px;font-size:17px}
.btn-ghost{background:var(--card);color:var(--primary-deep);border:1.5px solid var(--primary)}

/* ===== 1 导航栏 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,249,251,.92);backdrop-filter:blur(10px);border-bottom:1px solid transparent;transition:box-shadow .25s,border-color .25s}
.nav.scrolled{border-color:var(--border);box-shadow:0 6px 24px rgba(240,61,116,.08)}
.nav-inner{max-width:1160px;margin:0 auto;padding:0 32px;height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:20px}
.nav-logo{display:flex;align-items:center;gap:7px;color:var(--primary-deep);font-size:21px;font-weight:800;min-height:44px;letter-spacing:.5px}
.nav-logo em{font-style:normal;font-size:12px;font-weight:600;color:var(--primary);background:var(--primary-soft);border:1px solid var(--border);border-radius:999px;padding:2px 9px;line-height:1.5}
.nav-menu{display:flex;align-items:center;gap:4px}
.nav-menu a{font-size:15px;color:var(--text);padding:10px 14px;border-radius:999px;font-weight:500;transition:color .2s,background .2s;min-height:44px;display:inline-flex;align-items:center}
.nav-menu a:hover{color:var(--primary-deep);background:var(--primary-soft)}
.nav-dl{min-height:36px;padding:0 18px;font-size:14px}

/* ===== 2 Hero ===== */
.hero{padding:calc(var(--nav-h) + 56px) 0 72px;background:linear-gradient(180deg,var(--bg-soft),var(--bg))}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-txt h1{font-size:44px;color:var(--deep);line-height:1.25;letter-spacing:.5px}
.hero-txt h1 span{color:var(--primary)}
.ver-tag{font-style:normal;font-size:15px;font-weight:700;color:var(--primary-deep);background:var(--primary-soft);border:1px solid var(--border);border-radius:999px;padding:4px 13px;vertical-align:6px;margin-left:8px}
.hero-desc{font-size:17px;color:var(--text);margin:20px 0 22px;max-width:520px}
.hero-trust{display:flex;flex-wrap:wrap;gap:10px}
.hero-trust span{font-size:13px;color:var(--primary-deep);background:var(--primary-soft);border:1px solid var(--border);border-radius:999px;padding:5px 14px;font-weight:600}
.hero-people{margin-top:64px;text-align:center}
.hero-people h2{font-size:26px;color:var(--deep);margin-bottom:26px}
.people-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:16px;max-width:880px;margin:0 auto 34px}
.person{display:flex;flex-direction:column;align-items:center;gap:10px}
.person img{width:88px;height:88px;border-radius:50%;border:3px solid var(--card);box-shadow:var(--shadow);object-fit:cover;transition:transform .25s,box-shadow .25s}
.person:hover img{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.person span{font-size:13px;color:var(--text);font-weight:600}
.hero-dl{margin:0 auto}

/* 聊天窗口 */
.chat-card{background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow-hover);overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff}
.chat-avatar{width:44px;height:44px;border-radius:50%;border:2px solid #fff;object-fit:cover}
.chat-user strong{display:block;font-size:16px;line-height:1.3}
.chat-status{display:flex;align-items:center;gap:6px;font-size:12.5px;opacity:.95}
.chat-status i{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,197,126,.25)}
.chat-body{min-height:272px;padding:18px;background:#FFF7FA;display:flex;flex-direction:column;gap:12px}
.msg{max-width:78%;padding:10px 15px;border-radius:16px;font-size:14.5px;line-height:1.6;animation:pop .3s ease}
.msg.ai{align-self:flex-start;background:var(--card);border:1px solid var(--border);border-bottom-left-radius:4px;color:var(--text)}
.msg.user{align-self:flex-end;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:4px}
@keyframes pop{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;background:var(--card);border-top:1px solid var(--border)}
.chat-input input{flex:1;min-width:0;height:44px;border:1px solid var(--border);border-radius:999px;background:var(--bg);padding:0 16px;font-size:16px;color:var(--text);outline:none;transition:border-color .2s}
.chat-input input:focus{border-color:var(--primary)}
.send-btn{flex:none;width:44px;height:44px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;transition:opacity .25s,transform .25s}
.send-btn:hover{transform:translateY(-2px)}
.send-btn.disabled{background:#E9D6E0;cursor:not-allowed;transform:none}

/* ===== 3 三步上手 ===== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{padding:34px 28px;position:relative}
.step-num{font-size:40px;font-weight:800;color:var(--primary-soft);line-height:1;display:block;margin-bottom:16px;-webkit-text-stroke:1px var(--primary)}
.step h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.step p{font-size:14.5px;color:var(--muted)}

/* ===== 4 产品介绍 ===== */
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.about-txt h2{font-size:32px;color:var(--deep);margin-bottom:18px}
.about-txt p{font-size:15.5px;color:var(--text);margin-bottom:14px}
.check-list{list-style:none;margin-top:22px;display:flex;flex-direction:column;gap:14px}
.check-list li{display:flex;align-items:center;gap:10px;font-size:15.5px;font-weight:600;color:var(--deep)}
.check-list svg{color:var(--primary);flex:none}
.about-card{padding:34px 30px}
.about-card h3{font-size:20px;color:var(--primary-deep);margin-bottom:14px}
.about-card p{font-size:14.5px;color:var(--muted);margin-bottom:12px}

/* ===== 5 四大核心功能 ===== */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feat{padding:32px 26px;text-align:center}
.feat-icon{width:60px;height:60px;border-radius:18px;background:var(--primary-soft);color:var(--ic);display:inline-flex;align-items:center;justify-content:center;margin-bottom:18px}
.feat h3{font-size:17.5px;color:var(--deep);margin-bottom:10px}
.feat p{font-size:14px;color:var(--muted)}

/* ===== 6 优势对比 ===== */
.compare-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:thin}
.compare{border-collapse:separate;border-spacing:0;width:100%;min-width:640px;font-size:14.5px}
.compare th,.compare td{padding:16px 20px;text-align:center;border-bottom:1px solid var(--border)}
.compare thead th{font-size:15.5px;padding:18px 20px;color:#fff;letter-spacing:.5px}
.compare thead th:first-child{background:var(--deep);border-radius:var(--radius) 0 0 0}
.compare thead th:nth-child(2){background:linear-gradient(90deg,var(--primary),var(--primary-deep));box-shadow:0 4px 14px rgba(240,61,116,.3)}
.compare thead th:last-child{background:#9A8CA6;border-radius:0 var(--radius) 0 0}
.compare tbody td:first-child{font-weight:700;color:var(--deep);background:#FBF3F7;border-right:1px solid var(--border)}
.compare tbody tr:last-child td{border-bottom:none}
.compare td.good{background:#E8F9F1;color:#1B9A60;font-weight:700}
.compare td.bad{background:#F5F1F7;color:#8A7B96}
.compare-hint{display:none;text-align:center;color:var(--muted);font-size:13px;margin-top:14px}

/* ===== 7 数据模块 ===== */
.data-sec{background:linear-gradient(135deg,#3A2450,var(--deep))}
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.data-item{text-align:center;padding:30px 16px;border-radius:var(--radius);background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12)}
.data-item b{display:block;font-size:42px;color:#fff;font-weight:800;line-height:1.2}
.data-item span{color:#D9C8E8;font-size:14.5px;margin-top:6px;display:block}

/* ===== 8 用户真实评价 ===== */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review{padding:28px 26px}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{width:46px;height:46px;border-radius:50%;background:var(--av);color:#fff;font-size:19px;font-weight:700;display:flex;align-items:center;justify-content:center;flex:none}
.review-meta strong{display:block;font-size:15.5px;color:var(--deep)}
.stars{color:#FFB800;font-size:13px;letter-spacing:2px}
.review p{font-size:14.5px;color:var(--text)}

/* ===== 9 隐私安全 ===== */
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.priv{padding:30px 26px;text-align:center}
.priv h3{font-size:17.5px;color:var(--deep);margin-bottom:10px}
.priv p{font-size:14px;color:var(--muted)}

/* ===== 10 版本更新 ===== */
.version{max-width:760px;margin:0 auto;padding:36px 40px}
.version-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-bottom:18px;border-bottom:1px solid var(--border);margin-bottom:20px}
.version-head h3{font-size:20px;color:var(--deep)}
.version-date{font-size:13.5px;color:var(--muted);background:var(--bg-soft);border:1px solid var(--border);border-radius:999px;padding:5px 14px}
.changelog{list-style:none;display:flex;flex-direction:column;gap:13px}
.changelog li{font-size:14.5px;color:var(--text);display:flex;gap:10px;align-items:baseline}
.changelog em{font-style:normal;flex:none;font-size:12px;font-weight:700;color:var(--primary-deep);background:var(--primary-soft);border-radius:6px;padding:2px 8px}

/* ===== 11 FAQ ===== */
.faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.faq-item{padding:0;overflow:hidden}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:20px 26px;font-size:16px;font-weight:600;color:var(--deep);text-align:left;min-height:44px}
.faq-q svg{flex:none;color:var(--primary);transition:transform .3s}
.faq-item.open .faq-q svg{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 26px 22px;font-size:14.5px;color:var(--muted)}

/* ===== 12 下载区域 ===== */
.download-sec{background:linear-gradient(180deg,var(--deep),#3A2450);text-align:center}
.dl-title{color:#fff;font-size:40px;letter-spacing:.5px}
.dl-title span{color:var(--primary)}
.dl-title .ver-tag{background:rgba(255,228,238,.16);border-color:rgba(255,255,255,.25);color:#FFB9CF}
.dl-meta{color:#D9C8E8;font-size:14px;margin-top:16px}
.dl-btns{display:flex;justify-content:center;gap:20px;margin:34px 0 26px}
.dl-tip{color:#D9C8E8;font-size:14.5px}

/* ===== 13 页脚 ===== */
.footer{padding:40px 0;background:var(--deep);border-top:1px solid rgba(255,255,255,.08);text-align:center}
.footer-brand{color:#fff;font-size:18px;font-weight:800;display:inline-flex;align-items:center;min-height:44px;margin-bottom:8px}
.footer p{color:#B9A6CC;font-size:13px}

/* ===== 14 返回顶部 ===== */
.to-top{position:fixed;right:26px;bottom:30px;z-index:99;width:48px;height:48px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-hover);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,visibility .3s}
.to-top.show{opacity:1;visibility:visible;transform:none}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .sec-head h2{font-size:30px}
  .hero-txt h1{font-size:38px}
  .people-grid{grid-template-columns:repeat(4,1fr);max-width:560px;gap:16px}
  .person img{width:72px;height:72px}
  .features{grid-template-columns:repeat(2,1fr)}
  .privacy-grid{grid-template-columns:repeat(2,1fr)}
  .reviews{grid-template-columns:repeat(2,1fr)}
  .data-grid{grid-template-columns:repeat(2,1fr)}
  .data-item b{font-size:38px}
}

@media (max-width:900px){
  .nav-menu{display:none}
  .hero{padding-top:calc(var(--nav-h) + 36px)}
  .hero-inner{grid-template-columns:1fr;gap:32px}
  .hero-desc{max-width:100%}
  .hero-people{margin-top:44px}
  .steps{grid-template-columns:1fr;gap:18px}
  .about-grid{grid-template-columns:1fr;gap:32px}
  .dl-title{font-size:34px}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .nav-inner{padding:0 20px}
  .sec{padding:64px 0}
  .sec-head{margin-bottom:36px}
  .sec-head h2{font-size:26px}
  .hero{padding-top:calc(var(--nav-h) + 24px)}
  .hero-txt h1{font-size:31px}
  .hero-desc{font-size:15.5px}
  .chat-body{min-height:230px}
  .compare-hint{display:block}
  .dl-meta{font-size:12.5px}
  .dl-btns{flex-direction:column;gap:14px;margin:30px 0 22px}
  .dl-btns .btn{width:100%}
  .hero-dl{width:100%}
  .version{padding:28px 22px}
  .faq-q{padding:18px 20px}
  .faq-a p{padding:0 20px 20px}
  .nav-dl{font-size:13.5px;padding:0 14px;min-height:44px}
  .hero-trust span{font-size:14px}
  .person span{font-size:14px}
  .chat-status{font-size:14px}
  .compare-hint{font-size:14px}
  .stars{font-size:14px}
  .version-date{font-size:14px}
  .footer p{font-size:14px}
}

@media (max-width:640px){
  .hero-txt h1{font-size:27px}
  .features{grid-template-columns:1fr}
  .reviews{grid-template-columns:1fr}
  .privacy-grid{grid-template-columns:1fr}
  .data-grid{grid-template-columns:1fr 1fr;gap:14px}
  .data-item b{font-size:32px}
  .hero-people h2{font-size:22px}
  .people-grid{grid-template-columns:repeat(4,1fr);max-width:340px;gap:10px}
  .person img{width:60px;height:60px}
  .person span{font-size:13px}
  .dl-title{font-size:28px}
  .hero-dl{min-height:50px}
}