/* ===== ai风月 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);
  --nav-h:66px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 6px)}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;border:0;background:none;cursor:pointer}
svg{width:1em;height:1em;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

.container{max-width:1180px;margin:0 auto;padding:0 24px}
.section{padding:92px 0}
.section.alt{background:var(--bg-soft)}
.sec-tag{display:inline-block;padding:5px 16px;border-radius:999px;background:var(--primary-soft);color:var(--primary-deep);font-size:13px;font-weight:600;margin-bottom:14px}
.sec-tag.light{background:rgba(255,255,255,.12);color:#FFD1E1}
.sec-title{font-size:34px;font-weight:700;color:var(--deep);line-height:1.35;margin-bottom:18px}
.sec-title.light{color:#fff}
.sec-desc{color:var(--muted);font-size:16px;line-height:1.9}

/* 通用卡片 */
.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)}

/* 通用按钮 */
.btn{display:inline-block;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-weight:600;text-align:center;transition:transform .25s,box-shadow .25s}
.btn:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(240,61,116,.35)}
.btn-lg{padding:15px 40px;font-size:17px}

/* ===== 1 顶部导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);background:rgba(255,255,255,.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 24px rgba(42,26,61,.08)}
.nav-inner{display:flex;align-items:center;gap:28px;height:var(--nav-h)}
.logo{display:flex;align-items:center;gap:7px;min-height:44px;font-size:22px;font-weight:800;color:var(--deep);letter-spacing:.5px;white-space:nowrap}
.logo svg{width:24px;height:24px;color:var(--primary)}
.nav-menu{display:flex;align-items:center;gap:12px;margin-left:auto}
.nav-link{font-size:14px;color:var(--muted);font-weight:500;padding:6px 4px;position:relative;transition:color .2s;white-space:nowrap}
.nav-link::after{content:"";position:absolute;left:50%;bottom:0;width:0;height:2px;border-radius:2px;background:var(--primary);transform:translateX(-50%);transition:width .25s}
.nav-link:hover{color:var(--primary-deep)}
.nav-link:hover::after{width:70%}
.nav-btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 20px;font-size:13px;flex-shrink:0}

/* ===== 2 首屏 Hero ===== */
.hero{background:linear-gradient(180deg,var(--bg-soft),var(--bg));padding:calc(var(--nav-h) + 72px) 0 72px}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-text h1{font-size:42px;font-weight:800;color:var(--deep);line-height:1.3;margin-bottom:20px}
.hero-text .ver{color:var(--primary);font-size:.72em;font-weight:700;background:var(--primary-soft);border-radius:999px;padding:3px 14px;vertical-align:middle;margin-left:4px}
.hero-desc{color:var(--muted);font-size:17px;line-height:2;margin-bottom:28px;max-width:520px}
.hero-cta .btn{min-width:240px}

/* 聊天窗口 */
.chat{max-width:430px;margin-left:auto;background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:0 20px 50px rgba(240,61,116,.14);overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 16px;background:linear-gradient(90deg,var(--primary),var(--primary-deep))}
.chat-avatar{width:46px;height:46px;border-radius:50%;border:2px solid rgba(255,255,255,.85);object-fit:cover}
.chat-user{display:flex;flex-direction:column;line-height:1.35}
.chat-name{color:#fff;font-size:16px;font-weight:700}
.chat-status{color:#FFE9F1;font-size:12px;display:flex;align-items:center;gap:5px}
.chat-status .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,197,126,.35)}
.chat-body{display:flex;flex-direction:column;gap:10px;padding:16px;min-height:300px;max-height:340px;overflow-y:auto;background:var(--card)}
.msg{max-width:78%;padding:10px 14px;font-size:14px;line-height:1.6;border-radius:16px;animation:msgIn .3s ease}
.msg.ai{align-self:flex-start;background:var(--primary-soft);color:var(--deep);border-bottom-left-radius:6px}
.msg.me{align-self:flex-end;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:6px}
@keyframes msgIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.chat-input{display:flex;gap:8px;padding:12px;border-top:1px solid var(--border);background:var(--bg)}
.chat-input input{flex:1;min-width:0;border:1px solid var(--border);border-radius:999px;padding:11px 16px;font-size:14px;color:var(--muted);background:#fff;outline:none}
.chat-input input:focus{border-color:var(--primary)}
.chat-send{flex-shrink:0;min-width:56px;min-height:44px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-size:14px;font-weight:600;padding:0 20px;border-radius:999px;transition:background .3s,transform .2s}
.chat-send:hover{transform:translateY(-2px)}
.chat-send.disabled{background:#D9CBDD;cursor:not-allowed;transform:none}

/* 人设挑选 */
.personas{padding-top:64px}
.personas-title{font-size:20px;font-weight:700;color:var(--deep);text-align:center;margin-bottom:26px}
.personas-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:20px}
.persona{text-align:center}
.persona img{width:92px;height:92px;border-radius:50%;margin:0 auto;object-fit:cover;border:3px solid #fff;box-shadow:0 8px 22px rgba(240,61,116,.18);transition:transform .25s,box-shadow .25s}
.persona:hover img{transform:translateY(-5px);box-shadow:0 14px 30px rgba(240,61,116,.28)}
.persona figcaption{margin-top:10px;font-size:14px;font-weight:600;color:var(--deep)}

/* ===== 3 三步上手 ===== */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.step{position:relative;padding:34px 28px 30px;text-align:center}
.step-num{position:absolute;top:18px;right:22px;font-size:40px;font-weight:800;color:var(--primary-soft);line-height:1}
.step-icon{width:60px;height:60px;margin:0 auto 18px;border-radius:18px;background:linear-gradient(135deg,var(--primary-soft),#FFD3E4);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;font-size:26px}
.step h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.step p{color:var(--muted);font-size:14px;line-height:1.8}

/* ===== 4 产品介绍 ===== */
.product-inner{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:center}
.product-img img{width:100%;max-width:480px;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow)}
.checks{margin-top:24px;display:flex;flex-direction:column;gap:14px}
.checks li{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:600;color:var(--deep)}
.checks svg{width:22px;height:22px;color:#fff;background:linear-gradient(90deg,var(--primary),var(--primary-deep));border-radius:50%;padding:4px;flex-shrink:0}

/* ===== 5 四大核心功能 ===== */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:40px}
.feature{padding:30px 24px}
.feature-icon{width:52px;height:52px;border-radius:16px;background:linear-gradient(135deg,var(--primary-soft),#FFD3E4);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:18px}
.feature h3{font-size:18px;color:var(--deep);margin-bottom:8px}
.feature .pain{font-size:12.5px;color:var(--primary-deep);background:var(--primary-soft);border-radius:8px;padding:5px 10px;margin-bottom:10px;display:inline-block}
.feature p:last-child{font-size:14px;color:var(--muted);line-height:1.85}

/* ===== 6 优势对比 ===== */
.table-scroll{overflow-x:auto;margin-top:40px}
.compare-table{width:100%;min-width:640px;border-collapse:separate;border-spacing:0;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.compare-table th,.compare-table td{padding:15px 16px;font-size:14px;border-bottom:1px solid var(--border);text-align:left}
.compare-table thead th{background:var(--bg-soft);color:var(--deep);font-weight:700;font-size:15px;white-space:nowrap}
.compare-table thead th:first-child{border-top-left-radius:var(--radius)}
.compare-table thead th:last-child{border-top-right-radius:var(--radius)}
.compare-table tbody tr:last-child td{border-bottom:0}
.compare-table td:first-child{font-weight:600;color:var(--deep);white-space:nowrap}
.compare-table .col-hit{background:var(--primary-soft);color:var(--primary-deep);font-weight:600}
.compare-table th.col-hit{color:var(--deep)}
.tag-hit{display:inline-block;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-size:11px;font-weight:600;border-radius:999px;padding:1px 9px;margin-left:8px;vertical-align:2px}
.table-hint{display:none;text-align:center;color:var(--muted);font-size:12.5px;margin-top:12px}

/* ===== 7 使用场景 ===== */
.scene-list{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:34px 0 48px}
.scene-list li{display:flex;align-items:center;gap:9px;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px 16px;font-size:14px;font-weight:600;color:var(--deep);box-shadow:var(--shadow)}
.scene-list svg{width:18px;height:18px;color:var(--green);flex-shrink:0}
.vs-wrap{display:grid;grid-template-columns:1fr auto 1fr;gap:24px;align-items:stretch}
.vs-badge{display:flex;align-items:center;justify-content:center;width:54px;height:54px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-weight:800;font-size:15px;margin:auto;box-shadow:var(--shadow-hover)}
.vs-card{padding:32px 30px}
.vs-card h3{font-size:19px;margin-bottom:16px}
.vs-card li{position:relative;padding-left:22px;font-size:14px;color:var(--muted);line-height:1.9;margin-bottom:8px}
.vs-card li::before{content:"";position:absolute;left:0;top:11px;width:9px;height:9px;border-radius:50%}
.vs-bad{background:var(--bg)}
.vs-bad h3{color:var(--muted)}
.vs-bad li::before{background:#D9CBDD}
.vs-good{border-color:transparent;background:linear-gradient(180deg,#FFF0F6,var(--card))}
.vs-good h3{color:var(--primary-deep)}
.vs-good li::before{background:var(--primary)}

/* ===== 8 数据 ===== */
.stats{background:var(--deep);padding:92px 0;color:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:44px}
.stat{text-align:center;padding:30px 16px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius)}
.stat-num{font-size:44px;font-weight:800;background:linear-gradient(90deg,#FF9DBB,var(--primary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1.2}
.stat-label{margin-top:8px;font-size:14px;color:#D9CBDD}

/* ===== 9 人设定制 ===== */
.persona-inner{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center}
.persona-img img{width:100%;max-width:460px;margin-left:auto;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow)}
.persona-text .btn{margin-top:10px}

/* ===== 10 用户评价 ===== */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.review{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:17px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-name{font-size:15px;font-weight:700;color:var(--deep)}
.review-stars{color:#FFB03A;font-size:13px;letter-spacing:2px}
.review>p{font-size:14px;color:var(--muted);line-height:1.85}

/* ===== 11 隐私安全 ===== */
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:40px}
.privacy{padding:30px 24px}
.privacy h3{font-size:17px;color:var(--deep);margin-bottom:8px}
.privacy p{font-size:14px;color:var(--muted);line-height:1.85}

/* ===== 12 版本更新 ===== */
.version-card{max-width:720px;margin:40px auto 0;padding:34px 36px}
.version-head{display:flex;align-items:center;gap:16px;margin-bottom:22px;padding-bottom:20px;border-bottom:1px dashed var(--border)}
.version-num{font-size:26px;font-weight:800;color:var(--primary-deep)}
.version-date{font-size:14px;color:var(--muted)}
.changelog li{position:relative;padding-left:22px;font-size:14.5px;color:var(--text);line-height:1.9;margin-bottom:9px}
.changelog li::before{content:"";position:absolute;left:0;top:10px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

/* ===== 13 FAQ ===== */
.faq-wrap{max-width:820px}
.faq-list{margin-top:36px;display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:19px 24px;font-size:15.5px;font-weight:600;color:var(--deep);text-align:left;transition:color .2s}
.faq-q:hover{color:var(--primary-deep)}
.faq-q svg{width:18px;height:18px;color:var(--primary-deep);flex-shrink:0;transition:transform .3s}
.faq-item.open .faq-q{color:var(--primary-deep)}
.faq-item.open .faq-q svg{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 24px 20px;font-size:14px;color:var(--muted);line-height:1.9}

/* ===== 14 下载区域 ===== */
.download{background:linear-gradient(160deg,var(--bg-soft),var(--bg));padding:92px 0 84px;text-align:center}
.download h1{font-size:38px;font-weight:800;color:var(--deep)}
.download .ver{color:var(--primary);font-weight:700}
.dl-meta{margin-top:10px;font-size:14px;color:var(--muted)}
.dl-btns{display:flex;justify-content:center;gap:18px;margin-top:30px}
.dl-btn{min-width:250px;padding:15px 30px;font-size:16px}
.dl-btn-ghost{background:var(--deep)}
.dl-btn-ghost:hover{box-shadow:0 14px 30px rgba(42,26,61,.3)}
.dl-tip{margin-top:22px;font-size:14px;color:var(--muted)}

/* ===== 15 页脚 ===== */
.footer{background:var(--deep);color:#D9CBDD;padding:26px 0}
.footer-inner{display:flex;justify-content:center;font-size:13.5px}
.footer a{color:#FFB8CF;font-weight:600}
.footer a:hover{color:#fff}

/* ===== 16 返回顶部 ===== */
.back-top{position:fixed;right:26px;bottom:30px;z-index:90;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:var(--shadow-hover);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,visibility .3s}
.back-top.show{opacity:1;visibility:visible;transform:none}
.back-top:hover{transform:translateY(-3px)}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .nav-inner{gap:16px}
  .nav-link{font-size:13px}
  .personas-grid{grid-template-columns:repeat(3,1fr);row-gap:26px}
  .features-grid,.privacy-grid,.stats-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .sec-title{font-size:30px}
  .hero-text h1{font-size:36px}
  .download h1{font-size:33px}
}
@media (max-width:900px){
  .nav-menu{display:none}
  .nav-inner{justify-content:space-between}
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero-text{text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .hero-cta .btn{width:100%;max-width:360px}
  .chat{margin:0 auto}
  .personas{padding-top:52px}
  .product-inner,.persona-inner{grid-template-columns:1fr;gap:36px}
  .product-img img,.persona-img img{margin:0 auto}
  .persona-img img{order:-1}
  .vs-wrap{grid-template-columns:1fr}
  .vs-badge{margin:6px auto}
  .scene-list{grid-template-columns:repeat(2,1fr)}
  .section,.stats,.download{padding:72px 0}
  .download h1{font-size:30px}
}
@media (max-width:768px){
  .container{padding:0 20px}
  .persona-text .btn{display:block;width:100%}
  .sec-title{font-size:25px}
  .hero{padding-top:calc(var(--nav-h) + 44px)}
  .hero-text h1{font-size:29px}
  .hero-desc{font-size:15px}
  .hero-cta .btn{min-width:0}
  .chat-body{min-height:250px;max-height:300px}
  .personas-title{font-size:18px}
  .compare-table{min-width:640px}
  .table-hint{display:block}
  .scene-list{grid-template-columns:repeat(2,1fr);gap:10px}
  .scene-list li{padding:10px 12px;font-size:13px}
  .dl-btns{flex-direction:column;align-items:stretch;gap:14px}
  .dl-btn{width:100%;min-width:0}
  .dl-meta{font-size:12px;white-space:nowrap}
  .dl-tip{font-size:13px}
  .footer-inner{font-size:12.5px}
  .back-top{right:16px;bottom:20px}
  .version-head{flex-direction:column;align-items:flex-start;gap:6px}
}
@media (max-width:640px){
  .features-grid,.reviews-grid,.privacy-grid{grid-template-columns:1fr}
  .chat-body{min-height:220px;max-height:260px}
  .personas-grid{grid-template-columns:repeat(3,1fr);gap:14px}
  .persona img{width:78px;height:78px}
  .scene-list{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat-num{font-size:34px}
  .section,.stats,.download{padding:60px 0}
  .steps-grid{grid-template-columns:1fr}
  .faq-q{padding:16px 18px;font-size:14.5px}
  .faq-a p{padding:0 18px 18px}
  .download h1{font-size:26px}
}