/* ===== miraimind 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);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:70px}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",-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;cursor:pointer;border:none;background:none}
h1,h2,h3{line-height:1.3;color:var(--deep)}

.wrap{max-width:1160px;margin:0 auto;padding:0 24px}

/* 通用按钮 */
.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-size:15px;font-weight:600;padding:11px 26px;transition:transform .25s,box-shadow .25s;box-shadow:var(--shadow)}
.btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.btn-lg{font-size:17px;padding:14px 34px}

/* 通用卡片 */
.feat-card,.step-card,.review-card,.privacy-card,.version-card,.vs-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.feat-card:hover,.step-card:hover,.review-card:hover,.privacy-card:hover,.vs-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}

/* 区块标题 */
.sec-title{font-size:34px;text-align:center;margin-bottom:10px}
.sec-sub{text-align:center;color:var(--muted);font-size:16px;margin-bottom:46px}

/* ===== 1 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,249,251,.92);backdrop-filter:blur(8px);border-bottom:1px solid transparent;transition:box-shadow .25s,border-color .25s}
.nav.scrolled{box-shadow:0 6px 24px rgba(42,26,61,.08);border-color:var(--border)}
.nav-inner{max-width:1160px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;gap:28px}
.nav-logo{font-size:23px;font-weight:800;color:var(--deep);letter-spacing:.5px;padding:10px 0}
.nav-logo::first-letter{color:var(--primary)}
.nav-menu{display:flex;gap:26px;margin-left:auto}
.nav-menu a{font-size:15px;color:var(--text);position:relative;padding:4px 0}
.nav-menu a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;border-radius:2px;background:var(--primary);transition:width .25s}
.nav-menu a:hover::after{width:100%}
.nav-btn{padding:10px 20px;font-size:14px}
.nav-btn:hover{transform:translateY(-2px)}

/* ===== 2 Hero ===== */
.hero{background:linear-gradient(180deg,var(--bg-soft) 0%,var(--bg) 100%);padding:120px 0 80px}
.hero-inner{max-width:1160px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-left{min-width:0}
.hero-badge{display:inline-block;background:var(--primary-soft);color:var(--primary-deep);font-size:13px;font-weight:600;padding:6px 16px;border-radius:999px;margin-bottom:20px}
.hero h1{font-size:46px;font-weight:800;letter-spacing:.5px}
.hero h1 em,.download h1 em{font-style:normal;background:linear-gradient(90deg,var(--primary),var(--primary-deep));-webkit-background-clip:text;background-clip:text;color:transparent;margin-left:8px}
.hero h1 em{display:inline-block;font-size:34px;vertical-align:middle}
.hero-desc{color:var(--text);font-size:17px;margin:18px 0 30px;max-width:520px}
.hero-btn{min-width:280px}
.hero-avatars{margin-top:46px}
.hero-avatars h3{font-size:16px;font-weight:600;color:var(--muted);margin-bottom:18px}
.avatar-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.avatar-item{text-align:center;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:12px 6px 10px;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.avatar-item:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.avatar-item img{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:12px;margin-bottom:8px}
.avatar-item span{font-size:13px;font-weight:600;color:var(--deep)}

/* 聊天窗口 */
.chat{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 18px;background:linear-gradient(90deg,var(--primary),var(--primary-deep))}
.chat-head img{width:44px;height:44px;border-radius:50%;object-fit:cover;border:2px solid #fff;flex-shrink:0}
.chat-head-info{display:flex;flex-direction:column;line-height:1.4}
.chat-name{color:#fff;font-size:15px;font-weight:700}
.chat-status{color:rgba(255,255,255,.92);font-size:12px;display:flex;align-items:center;gap:5px}
.chat-status .dot{width:7px;height:7px;border-radius:50%;background:var(--green)}
.chat-body{height:300px;padding:18px;overflow-y:auto;background:var(--bg);display:flex;flex-direction:column;gap:12px}
.msg{max-width:82%;padding:11px 15px;border-radius:16px;font-size:14px;line-height:1.6;word-break:break-word;animation:msgIn .3s ease}
.msg.ai{align-self:flex-start;background:var(--card);border:1px solid var(--border);border-top-left-radius:6px;color:var(--text)}
.msg.user{align-self:flex-end;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-top-right-radius:6px}
@keyframes msgIn{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;border:1px solid var(--border);border-radius:999px;padding:10px 18px;font-size:13px;color:var(--muted);background:var(--bg);outline:none}
.send-btn{flex-shrink:0;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;padding:12px 22px;font-size:13px;font-weight:600;transition:transform .2s;box-shadow:var(--shadow)}
.send-btn:hover{transform:translateY(-2px)}
.send-btn.disabled{background:#D8C6D2;color:#fff;cursor:not-allowed;box-shadow:none;transform:none}

/* ===== 3 三步上手 ===== */
.steps{padding:80px 0;background:var(--bg)}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{position:relative;padding:36px 28px 30px;text-align:left;overflow:hidden}
.step-num{position:absolute;top:18px;right:22px;font-size:44px;font-weight:800;color:var(--primary-soft);line-height:1}
.step-card h3{font-size:20px;margin:6px 0 10px}
.step-card p{color:var(--muted);font-size:15px}

/* ===== 4 产品介绍 ===== */
.intro{padding:80px 0;background:var(--bg-soft)}
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.intro-img img,.custom-img img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow)}
.intro-text h2,.custom-text h2{font-size:32px;margin-bottom:18px}
.intro-text>p,.custom-text>p{color:var(--text);font-size:16px}
.intro-text>p{margin-bottom:26px}
.custom-text>p{margin-bottom:24px}
.check-list{display:flex;flex-direction:column;gap:14px}
.check-list li{display:flex;align-items:flex-start;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:14px 18px;box-shadow:var(--shadow)}
.check-list li::before{content:"";flex-shrink:0;width:20px;height:20px;margin-top:3px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep)) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23fff' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E") center/12px no-repeat}
.check-list li strong{display:block;font-size:15px;color:var(--deep)}
.check-list li span{font-size:14px;color:var(--muted)}

/* ===== 5 四大核心功能 ===== */
.features{padding:80px 0;background:var(--bg)}
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feat-card{padding:30px 24px;text-align:center}
.feat-icon{display:inline-flex;width:58px;height:58px;border-radius:16px;background:var(--primary-soft);color:var(--primary-deep);align-items:center;justify-content:center;margin-bottom:18px}
.feat-icon svg{width:28px;height:28px}
.feat-card h3{font-size:19px;margin-bottom:10px}
.feat-pain{font-size:13px;color:var(--primary-deep);background:var(--primary-soft);border-radius:999px;padding:5px 12px;display:inline-block;margin-bottom:12px}
.feat-desc{font-size:14px;color:var(--muted)}

/* ===== 6 优势对比 ===== */
.compare{padding:80px 0;background:var(--bg-soft)}
.compare-scroll{border-radius:var(--radius);overflow-x:auto;box-shadow:var(--shadow);background:var(--card);border:1px solid var(--border)}
.compare-table{width:100%;border-collapse:collapse;background:var(--card);font-size:14px}
.compare-table th,.compare-table td{padding:14px 18px;text-align:center;border-bottom:1px solid var(--border);white-space:nowrap}
.compare-table thead th{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-weight:600;font-size:15px}
.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 td:first-child{background:var(--bg-soft);color:var(--deep);font-weight:600;width:120px}
.compare-table tbody tr:last-child td{border-bottom:none}
.swipe-tip{display:none;text-align:center;color:var(--muted);font-size:13px;margin-top:14px}

/* ===== 7 使用场景 ===== */
.scenes{padding:80px 0;background:var(--bg)}
.scene-list{max-width:760px;margin:0 auto 56px;display:flex;flex-direction:column;gap:14px}
.scene-list li{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:14px 20px;font-size:15px;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.scene-list li:hover{transform:translateX(6px);box-shadow:var(--shadow-hover)}
.scene-list li::before{content:"";flex-shrink:0;width:22px;height:22px;border-radius:50%;background:var(--primary-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23F03D74' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E") center/13px no-repeat}
.vs-cards{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:960px;margin:0 auto;position:relative}
.vs-badge{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:2;width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:20px;font-weight:800;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-hover);border:4px solid var(--bg)}
.vs-card{padding:30px 28px}
.vs-card h3{font-size:20px;margin-bottom:16px;display:flex;align-items:center;gap:8px}
.vs-card p{font-size:14px;color:var(--muted);margin-bottom:10px;padding-left:14px;position:relative}
.vs-card p::before{content:"";position:absolute;left:0;top:10px;width:6px;height:6px;border-radius:50%;background:var(--border)}
.vs-alone h3{color:var(--muted)}
.vs-alone h3::before,.vs-together h3::before{content:"";width:10px;height:10px;border-radius:50%}
.vs-alone h3::before{background:#C9B8C8}
.vs-together h3::before{background:var(--primary)}
.vs-together{border-color:transparent;background:linear-gradient(160deg,#FFF0F6,#FFE4EE)}
.vs-together h3{color:var(--primary-deep)}
.vs-together p::before{background:var(--primary)}

/* ===== 8 数据 ===== */
.stats{background:linear-gradient(120deg,var(--deep),#4A2A63);padding:76px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-num{display:block;font-size:46px;font-weight:800;color:#fff;background:linear-gradient(90deg,var(--primary),#FF9DBE);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.2}
.stat p{color:rgba(255,255,255,.82);font-size:15px;margin-top:8px}

/* ===== 9 人设定制 ===== */
.custom{padding:80px 0;background:var(--bg)}
.custom-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.custom-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:30px}
.custom-tags li{background:var(--primary-soft);color:var(--primary-deep);font-size:14px;font-weight:600;padding:7px 16px;border-radius:999px}
.custom-btn{min-width:240px}

/* ===== 10 用户评价 ===== */
.reviews{padding:80px 0;background:var(--bg-soft)}
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);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-meta{display:flex;flex-direction:column;line-height:1.4}
.review-name{font-size:15px;font-weight:600;color:var(--deep)}
.stars{color:#FFB43A;font-size:14px;letter-spacing:2px}
.review-card>p{font-size:14px;color:var(--text)}

/* ===== 11 隐私安全 ===== */
.privacy{padding:80px 0;background:var(--bg)}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.privacy-card{padding:30px 24px;text-align:center}
.privacy-icon{display:inline-flex;width:56px;height:56px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);align-items:center;justify-content:center;margin-bottom:16px}
.privacy-icon svg{width:26px;height:26px}
.privacy-card h3{font-size:18px;margin-bottom:10px}
.privacy-card p{font-size:14px;color:var(--muted)}

/* ===== 12 版本更新 ===== */
.version{padding:80px 0;background:var(--bg-soft)}
.version-card{max-width:760px;margin:0 auto;padding:32px 34px}
.version-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;margin-bottom:20px;padding-bottom:18px;border-bottom:1px dashed var(--border)}
.version-num{font-size:24px;font-weight:800;color:var(--primary-deep)}
.version-date{font-size:14px;color:var(--muted)}
.version-log{display:flex;flex-direction:column;gap:14px}
.version-log li{display:flex;align-items:flex-start;gap:10px;font-size:15px;color:var(--text)}
.version-log li span{flex-shrink:0;font-size:12px;font-weight:600;padding:2px 10px;border-radius:999px;margin-top:3px}
.tag-new{background:var(--primary-soft);color:var(--primary-deep)}
.tag-opt{background:#EDF7FF;color:#2E7FC5}
.tag-fix{background:#FFF3E0;color:#D97706}

/* ===== 13 FAQ ===== */
.faq{padding:80px 0;background:var(--bg)}
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:16px;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:16px;padding:18px 22px;font-size:16px;font-weight:600;color:var(--deep);text-align:left}
.faq-arrow{flex-shrink:0;width:22px;height:22px;border-radius:50%;background:var(--primary-soft);position:relative;transition:transform .3s}
.faq-arrow::before,.faq-arrow::after{content:"";position:absolute;top:50%;left:50%;background:var(--primary-deep);transform:translate(-50%,-50%)}
.faq-arrow::before{width:10px;height:2px}
.faq-arrow::after{width:2px;height:10px}
.faq-item.open .faq-arrow{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-item.open .faq-a{max-height:280px}
.faq-a p{padding:0 22px 20px;font-size:14px;color:var(--muted)}

/* ===== 14 下载区域 ===== */
.download{padding:84px 0;background:linear-gradient(180deg,var(--bg-soft),var(--bg));text-align:center}
.download h1{font-size:40px;font-weight:800}
.download h1 em{font-size:30px}
.dl-meta{color:var(--muted);font-size:14px;margin:14px 0 30px}
.dl-btns{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}
.dl-btn{min-width:280px}
.dl-btn-ios{background:linear-gradient(90deg,#4A2A63,var(--deep))}
.dl-tip{color:var(--muted);font-size:14px;margin-top:24px}

/* ===== 15 页脚 ===== */
.footer{background:var(--deep);color:rgba(255,255,255,.75);padding:40px 0;text-align:center}
.footer-link{font-size:14px}
.footer-link a{color:#fff;font-weight:600}
.footer-sub{font-size:13px;color:rgba(255,255,255,.5);margin-top:8px}

/* ===== 16 返回顶部 ===== */
.back-top{position:fixed;right:26px;bottom:30px;z-index:99;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;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(-4px)}
.back-top svg{width:20px;height:20px}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .sec-title{font-size:30px}
  .avatar-grid{grid-template-columns:repeat(3,1fr)}
  .feat-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)}
  .hero h1{font-size:40px}
}

@media (max-width:900px){
  .nav-menu{display:none}
  .nav-btn{margin-left:auto}
  .hero-inner{grid-template-columns:1fr;gap:44px;padding-top:16px}
  .hero{padding:104px 0 64px}
  .hero-desc{max-width:100%}
  .hero-right{max-width:480px;margin:0 auto;width:100%}
  .intro-grid,.custom-grid{grid-template-columns:1fr;gap:36px}
  .vs-cards{display:flex;flex-direction:column;gap:0}
  .vs-badge{position:static;transform:none;width:56px;height:56px;font-size:18px;margin:22px auto;flex-shrink:0}
  .intro-img,.custom-img{max-width:520px;margin:0 auto}
  .intro-text,.custom-text{text-align:center}
  .check-list li{text-align:left}
  .custom-tags{justify-content:center}
}

@media (max-width:768px){
  .wrap,.nav-inner,.hero-inner{padding-left:20px;padding-right:20px}
  .steps-grid{grid-template-columns:1fr}
  .step-card{text-align:center}
  .step-num{right:auto;left:50%;transform:translateX(-50%);top:14px}
  .step-card h3{margin-top:34px}
  .sec-sub{margin-bottom:36px}
  .sec-title{font-size:26px}
  .hero h1{font-size:32px}
  .hero h1 em{font-size:24px;display:block;margin:6px 0 0}
  .hero-btn{width:100%;min-width:0}
  .chat-body{height:240px}
  .compare-scroll{-webkit-overflow-scrolling:touch}
  .compare-table{min-width:640px}
  .swipe-tip{display:block}
  .dl-btns{flex-direction:column;align-items:stretch;max-width:420px;margin:0 auto}
  .dl-btn{min-width:0;width:100%}
  .download h1{font-size:30px}
  .download h1 em{font-size:22px;display:block;margin:6px 0 0}
  .dl-meta{font-size:12px}
  .back-top{right:16px;bottom:22px}
  .stats{padding:60px 0}
  .stat-num{font-size:36px}
  .footer{padding:32px 20px}
}

@media (max-width:640px){
  .feat-grid,.review-grid,.privacy-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr 1fr;gap:30px 16px}
  .avatar-grid{grid-template-columns:repeat(3,1fr);gap:12px}
  .hero{padding:96px 0 56px}
  .chat-head img{width:40px;height:40px}
  .send-btn{padding:11px 18px}
  .chat-input input{font-size:16px}
}