/* ===== 青丘语Ai 官网落地页样式 ===== */
: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);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:70px;-webkit-text-size-adjust:100%}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;background:var(--bg);color:var(--text);line-height:1.7;font-size:16px}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:88px 0}
.section-tag{display:inline-block;background:var(--primary-soft);color:var(--primary-deep);font-size:14px;font-weight:600;padding:6px 16px;border-radius:999px;margin-bottom:14px}
h2.section-title{font-size:36px;line-height:1.35;color:var(--deep);margin-bottom:12px}
.section-sub{color:var(--muted);font-size:16px;max-width:640px}

/* ===== 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;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-weight:600;transition:transform .25s,box-shadow .25s;box-shadow:0 8px 22px rgba(240,61,116,.28)}
.btn:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(240,61,116,.36)}
.btn:active{transform:translateY(-1px)}

/* ===== 1 导航栏 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,249,251,.94);backdrop-filter:blur(10px);border-bottom:1px solid transparent;transition:box-shadow .3s,border-color .3s}
.nav.scrolled{border-color:var(--border);box-shadow:0 6px 20px rgba(240,61,116,.08)}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.nav-logo{font-size:22px;font-weight:800;color:var(--deep);letter-spacing:.5px;white-space:nowrap}
.nav-logo em{font-style:normal;color:var(--primary)}
.nav-menu{display:flex;align-items:center;gap:4px}
.nav-menu a{padding:8px 14px;font-size:15px;color:var(--text);border-radius:10px;transition:color .2s,background .2s}
.nav-menu a:hover{color:var(--primary-deep);background:var(--primary-soft)}
.nav-btn{padding:8px 20px;font-size:14px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-weight:600;transition:box-shadow .25s,transform .25s;box-shadow:0 6px 16px rgba(240,61,116,.26);white-space:nowrap}
.nav-btn:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(240,61,116,.34)}

/* ===== 2 Hero ===== */
.hero{padding:150px 0 90px;background:radial-gradient(900px 480px at 85% 8%,var(--primary-soft),transparent 60%),radial-gradient(700px 420px at 5% 95%,#F6EAFF,transparent 55%),var(--bg)}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{font-size:46px;line-height:1.3;color:var(--deep);font-weight:800}
.hero h1 em{font-style:normal;color:var(--primary)}
.hero-desc{color:var(--muted);font-size:17px;margin:18px 0 28px;max-width:520px}
.hero-desc strong{color:var(--primary-deep);font-weight:700}
.personas{margin-bottom:30px}
.personas-title{font-size:15px;color:var(--deep);font-weight:600;margin-bottom:14px}
.personas-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;max-width:560px}
.persona{text-align:center;cursor:default}
.persona img{width:100%;aspect-ratio:1;border-radius:16px;border:2px solid var(--border);transition:transform .25s,box-shadow .25s}
.persona:hover img{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.persona span{display:block;font-size:13px;color:var(--text);margin-top:6px;font-weight:500}
.persona span.custom{color:var(--primary-deep)}
.hero-btn{padding:15px 42px;font-size:17px}

/* 聊天窗口 */
.chat{background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:0 24px 60px rgba(240,61,116,.16);overflow:hidden;max-width:420px;width:100%;margin:0 auto}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 16px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff}
.chat-avatar{width:46px;height:46px;border-radius:50%;border:2px solid #fff;object-fit:cover;flex-shrink:0}
.chat-user{flex:1;min-width:0}
.chat-name{font-size:16px;font-weight:700;line-height:1.2}
.chat-status{font-size:12px;color:rgba(255,255,255,.92);display:flex;align-items:center;gap:5px;line-height:1.3;margin-top:2px}
.chat-dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,197,126,.35);flex-shrink:0}
.chat-more{color:rgba(255,255,255,.9);font-size:20px;line-height:1}
.chat-body{height:296px;overflow-y:auto;padding:18px 16px;background:linear-gradient(180deg,#FFF6FA,#FFEFF5);display:flex;flex-direction:column;gap:14px;scrollbar-width:thin}
.msg{display:flex;max-width:82%}
.msg p{padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.6}
.msg.user{align-self:flex-end}
.msg.user p{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:5px}
.msg.ai{align-self:flex-start}
.msg.ai p{background:#fff;color:var(--text);border:1px solid var(--border);border-bottom-left-radius:5px}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;background:#fff;border-top:1px solid var(--border)}
.chat-input input{flex:1;min-width:0;border:1px solid var(--border);background:var(--bg-soft);border-radius:999px;padding:10px 16px;font-size:16px;color:var(--text);outline:none}
.chat-input input::placeholder{color:var(--muted)}
.chat-send{flex-shrink:0;padding:9px 20px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-size:14px;font-weight:600;transition:box-shadow .25s,opacity .25s}
.chat-send:hover{box-shadow:0 8px 18px rgba(240,61,116,.3)}
.chat-send:disabled,.chat-send.off{background:#D9C8D2;cursor:not-allowed;box-shadow:none}

/* ===== 3 三步上手 ===== */
.steps{background:var(--bg)}
.steps .section-head{text-align:center;margin-bottom:44px}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{padding:34px 28px;position:relative;overflow:hidden}
.step-num{font-size:44px;font-weight:800;color:var(--primary-soft);line-height:1;position:absolute;top:22px;right:24px;font-style:normal}
.step-icon{width:56px;height:56px;border-radius:16px;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.step-icon svg{width:28px;height:28px;stroke:var(--primary-deep)}
.step-card h3{font-size:19px;color:var(--deep);margin-bottom:8px}
.step-card p{color:var(--muted);font-size:15px}

/* ===== 4 产品介绍 ===== */
.intro{background:var(--bg-soft)}
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.intro-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.intro-img img{width:100%;aspect-ratio:1;object-fit:cover}
.intro-text h2{font-size:34px;color:var(--deep);line-height:1.4;margin:12px 0 16px}
.intro-text p.lead{color:var(--muted);font-size:16px;margin-bottom:22px}
.check-list li{display:flex;align-items:flex-start;gap:10px;padding:11px 0;border-bottom:1px dashed var(--border);font-size:15px;color:var(--text)}
.check-list li:last-child{border-bottom:none}
.check-list li i{flex-shrink:0;width:22px;height:22px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-style:normal;display:flex;align-items:center;justify-content:center;margin-top:3px}
.check-list li i svg,.custom-list li i svg{width:13px;height:13px;stroke:#fff}
.update-list li i svg{width:11px;height:11px;stroke:#fff}

/* ===== 5 核心功能 ===== */
.features .section-head{text-align:center;margin-bottom:44px}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{padding:30px 26px}
.feature-icon{width:54px;height:54px;border-radius:16px;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.feature-icon svg{width:27px;height:27px;stroke:var(--primary-deep)}
.feature-card h3{font-size:18px;color:var(--deep);margin-bottom:6px}
.feature-pain{font-size:13px;color:var(--primary-deep);background:var(--primary-soft);display:inline-block;padding:3px 12px;border-radius:999px;margin-bottom:10px;font-weight:500}
.feature-card p.desc{color:var(--muted);font-size:14px}

/* ===== 6 优势对比 ===== */
.compare{background:var(--bg-soft)}
.compare .section-head{text-align:center;margin-bottom:40px}
.table-wrap{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.compare-table{width:100%;min-width:640px;border-collapse:collapse;table-layout:fixed}
.compare-table th,.compare-table td{padding:15px 14px;text-align:center;font-size:14px;border-bottom:1px solid var(--border);white-space:nowrap}
.compare-table thead th{background:var(--deep);color:#fff;font-weight:600;font-size:15px}
.compare-table thead th:first-child{width:22%}
.compare-table tbody th{background:var(--bg-soft);color:var(--deep);font-weight:600;text-align:left;padding-left:18px;white-space:normal}
.compare-table tbody tr:last-child td,.compare-table tbody tr:last-child th{border-bottom:none}
.compare-table td.col-me{background:var(--primary-soft);color:var(--primary-deep);font-weight:600}
.compare-table tbody tr:hover td{background:#FFF4F9}
.compare-table tbody tr:hover td.col-me{background:var(--primary-soft)}
.swipe-tip{display:none;text-align:center;color:var(--muted);font-size:13px;margin-top:12px}

/* ===== 7 使用场景 ===== */
.scene .section-head{text-align:center;margin-bottom:40px}
.scene-list{display:grid;grid-template-columns:1fr 1fr;gap:14px 32px;max-width:960px;margin:0 auto 56px}
.scene-list li{display:flex;align-items:flex-start;gap:10px;font-size:15px;color:var(--text);padding:10px 14px;background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow)}
.scene-list li i{flex-shrink:0;width:20px;height:20px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-style:normal;font-size:12px;display:flex;align-items:center;justify-content:center;margin-top:4px}
.vs-wrap{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;align-items:stretch}
.vs-card{padding:34px 30px}
.vs-card h3{font-size:21px;color:var(--deep);margin-bottom:12px}
.vs-card p{color:var(--muted);font-size:15px}
.vs-left{border-top:4px solid #B9A9C8}
.vs-right{border-top:4px solid var(--primary)}
.vs-right h3{color:var(--primary-deep)}
.vs-badge{align-self:center;width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-weight:800;font-size:18px;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 26px rgba(240,61,116,.35);flex-shrink:0}

/* ===== 8 数据模块 ===== */
.stats{background:linear-gradient(160deg,#2A1A3D,#3B2457);color:#fff}
.stats .section-head{text-align:center;margin-bottom:44px}
.stats .section-title{color:#fff}
.stats .section-sub{color:rgba(255,255,255,.7)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat{text-align:center;padding:36px 20px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius);transition:transform .25s,background .25s}
.stat:hover{transform:translateY(-6px);background:rgba(255,255,255,.1)}
.stat-num{font-size:42px;font-weight:800;color:#fff;line-height:1.2}
.stat-label{color:rgba(255,255,255,.75);font-size:15px;margin-top:8px}

/* ===== 9 人设定制 ===== */
.custom{background:var(--bg-soft)}
.custom-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.custom-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.custom-img img{width:100%;aspect-ratio:1;object-fit:cover}
.custom-text h2{font-size:34px;color:var(--deep);line-height:1.4;margin:12px 0 16px}
.custom-text h2 em{font-style:normal;color:var(--primary-deep)}
.custom-text p{color:var(--muted);font-size:16px;margin-bottom:18px}
.custom-list li{display:flex;align-items:center;gap:10px;font-size:15px;color:var(--text);padding:8px 0}
.custom-list li i{width:22px;height:22px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-style:normal;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.custom-btn{margin-top:16px;padding:14px 38px;font-size:16px}

/* ===== 10 用户评价 ===== */
.review .section-head{text-align:center;margin-bottom:44px}
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.review-card{padding:26px 24px}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:18px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-name{font-size:15px;color:var(--deep);font-weight:600}
.stars{font-size:13px;color:#FFB648;letter-spacing:2px;line-height:1.4}
.review-card p.text{color:var(--muted);font-size:14px}

/* ===== 11 隐私安全 ===== */
.privacy{background:var(--bg-soft)}
.privacy .section-head{text-align:center;margin-bottom:44px}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.privacy-card{padding:30px 26px;text-align:center}
.privacy-icon{width:54px;height:54px;border-radius:16px;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.privacy-icon svg{width:27px;height:27px;stroke:var(--primary-deep)}
.privacy-card h3{font-size:18px;color:var(--deep);margin-bottom:8px}
.privacy-card p{color:var(--muted);font-size:14px}

/* ===== 12 版本更新 ===== */
.update-card{max-width:760px;margin:0 auto;padding:36px 38px}
.update-top{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:18px}
.update-ver{font-size:26px;font-weight:800;color:var(--primary-deep)}
.update-time{color:var(--muted);font-size:14px}
.update-list li{display:flex;align-items:flex-start;gap:10px;padding:9px 0;font-size:15px;color:var(--text);border-bottom:1px dashed var(--border)}
.update-list li:last-child{border-bottom:none}
.update-list li i{flex-shrink:0;width:18px;height:18px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);font-style:normal;display:flex;align-items:center;justify-content:center;margin-top:4px}

/* ===== 13 FAQ ===== */
.faq{background:var(--bg)}
.faq .section-head{text-align:center;margin-bottom:40px}
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:16px;margin-bottom:14px;box-shadow:var(--shadow);overflow:hidden;transition:box-shadow .25s}
.faq-item.open{box-shadow:var(--shadow-hover)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 22px;font-size:16px;color:var(--deep);font-weight:600;text-align:left}
.faq-arrow{width:28px;height:28px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);font-size:16px;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:transform .3s}
.faq-item.open .faq-arrow{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 22px 20px;color:var(--muted);font-size:15px}

/* ===== 14 下载区域 ===== */
.download{background:radial-gradient(800px 420px at 50% 0%,#FFE4EE,transparent 62%),linear-gradient(160deg,#2A1A3D,#3B2457);color:#fff;text-align:center}
.download h1{font-size:44px;font-weight:800;color:#fff;margin-bottom:10px}
.download h1 em{font-style:normal;color:var(--primary)}
.dl-meta{color:rgba(255,255,255,.7);font-size:14px;margin-bottom:32px;letter-spacing:.5px}
.dl-btns{display:flex;gap:20px;justify-content:center;flex-wrap:wrap}
.dl-btn{padding:16px 46px;font-size:17px}
.dl-tip{margin-top:26px;color:rgba(255,255,255,.85);font-size:15px}

/* ===== 15 页脚 ===== */
.footer{background:#241536;color:rgba(255,255,255,.7);text-align:center;padding:30px 0;font-size:14px}
.footer a{color:rgba(255,255,255,.85);transition:color .2s}
.footer a:hover{color:var(--primary)}

/* ===== 16 返回顶部 ===== */
.totop{position:fixed;right:26px;bottom:30px;width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:20px;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 26px rgba(240,61,116,.35);opacity:0;visibility:hidden;transform:translateY(16px);transition:opacity .3s,visibility .3s,transform .3s;z-index:99}
.totop.show{opacity:1;visibility:visible;transform:translateY(0)}
.totop:hover{transform:translateY(-3px)}
.totop svg{width:22px;height:22px;stroke:#fff}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .personas-grid{grid-template-columns:repeat(3,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .privacy-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  h1.hero-h1{font-size:38px}
  .download h1{font-size:38px}
  .hero-inner{gap:40px}
}
@media (max-width:900px){
  .nav-menu{display:none}
  .hero{padding:120px 0 70px}
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero-desc{max-width:none}
  .personas-grid{max-width:560px}
  .intro-grid{grid-template-columns:1fr;gap:36px}
  .custom-grid{grid-template-columns:1fr;gap:36px}
  .steps-grid{grid-template-columns:1fr;gap:18px}
  .scene-list{grid-template-columns:1fr}
  .vs-wrap{grid-template-columns:1fr}
  .vs-badge{width:56px;height:56px;justify-self:center}
  .section{padding:64px 0}
}
@media (max-width:768px){
  .container{padding:0 20px}
  h2.section-title{font-size:28px}
  .nav-inner{padding:0 20px;height:58px}
  .nav-logo{font-size:20px}
  .nav-btn{padding:7px 16px;font-size:13px}
  .table-scroll{overflow-x:auto}
  .swipe-tip{display:block}
  .dl-btns{flex-direction:column}
  .dl-btn{width:100%;max-width:360px;margin:0 auto}
  .dl-meta{font-size:12px;white-space:nowrap}
  .download h1{font-size:32px}
  .hero-btn,.custom-btn{width:100%;max-width:none}
  .chat-body{height:250px}
}
@media (max-width:640px){
  .feature-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .privacy-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat-num{font-size:32px}
  .section{padding:52px 0}
  .hero h1{font-size:30px}
  .hero-desc{font-size:15px}
  .steps-grid{grid-template-columns:1fr}
  .chat-body{height:220px}
  .totop{right:16px;bottom:22px;width:44px;height:44px}
}