*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#4F6EF7;--primary-dark:#3D5CE5;--primary-light:#EEF1FE;
  --text:#111827;--text2:#6B7280;--border:#E5E7EB;--bg:#F8FAFC;--card:#fff;
}
body{font-family:"Microsoft YaHei UI","PingFang SC",sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{text-decoration:none;color:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ── 按钮 ── */
.btn-primary{background:var(--primary);color:#fff;padding:10px 22px;border-radius:8px;font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:6px;transition:.2s;border:none;cursor:pointer;font-family:inherit}
.btn-primary:hover{background:var(--primary-dark)}
.btn-outline{border:1.5px solid var(--primary);color:var(--primary);padding:10px 22px;border-radius:8px;font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:6px;transition:.2s;background:transparent;cursor:pointer;font-family:inherit}
.btn-outline:hover{background:var(--primary-light)}
.btn-ghost{color:var(--text2);padding:8px 16px;border-radius:8px;font-size:14px;transition:.2s}
.btn-ghost:hover{color:var(--primary);background:var(--primary-light)}
.btn-white{background:#fff;color:var(--primary);padding:14px 40px;border-radius:10px;font-size:16px;font-weight:700;display:inline-flex;align-items:center;gap:8px;transition:.2s;box-shadow:0 4px 16px rgba(0,0,0,.2)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.3)}
.btn-lg{padding:14px 32px;font-size:15px}

/* ── 导航 ── */
.navbar{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;gap:32px}
.logo{display:flex;align-items:center;gap:8px;font-size:16px;font-weight:700;white-space:nowrap}
.logo-icon-img{width:28px;height:28px;object-fit:contain}
.nav-links{display:flex;gap:4px;list-style:none;flex:1}
.nav-links a{padding:6px 12px;border-radius:6px;font-size:14px;color:var(--text2);transition:.2s}
.nav-links a:hover,.nav-links a.active{color:var(--primary);background:var(--primary-light)}
.nav-actions{display:flex;gap:8px;align-items:center;white-space:nowrap}
.nav-toggle{display:none;background:none;border:none;font-size:20px;cursor:pointer;padding:4px 8px}

/* ── 活动横幅 ── */
.activity-banner{background:linear-gradient(135deg,#4F6EF7,#7C3AED);color:#fff;text-align:center;padding:10px 24px;font-size:14px;display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap}
.activity-banner a{color:#fff;font-weight:600;text-decoration:underline}

/* ── Hero ── */
.hero{max-width:1200px;margin:0 auto;padding:72px 24px 56px;display:flex;align-items:center;gap:64px}
.hero-content{flex:1}
.hero-badge{display:inline-block;background:var(--primary-light);color:var(--primary);font-size:13px;padding:5px 14px;border-radius:20px;margin-bottom:20px;font-weight:500}
h1{font-size:46px;font-weight:800;line-height:1.2;margin-bottom:16px}
.gradient-text{background:linear-gradient(135deg,#4F6EF7,#7C3AED);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{font-size:17px;color:var(--text2);margin-bottom:32px;line-height:1.8}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:20px}
.hero-meta{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--text2)}
.hero-img{flex:1;max-width:520px}
.hero-img img{width:100%;border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,.12)}

/* ── 统计 ── */
.stats{background:#fff;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.stats .container{display:flex;justify-content:space-around;padding:28px 24px;flex-wrap:wrap;gap:20px}
.stat-item{text-align:center}
.stat-num{font-size:28px;font-weight:800;background:linear-gradient(135deg,#4F6EF7,#7C3AED);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.stat-label{font-size:13px;color:var(--text2);margin-top:4px}

/* ── 通用 section ── */
.section-header{text-align:center;margin-bottom:48px}
.section-tag{font-size:12px;color:var(--primary);font-weight:700;letter-spacing:2px;text-transform:uppercase;margin-bottom:12px}
.section-header h2{font-size:32px;font-weight:800;margin-bottom:12px}
.section-header p{font-size:16px;color:var(--text2)}

/* ── 功能卡片 ── */
.features-section{padding:72px 0}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:28px;transition:.2s}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 12px 32px rgba(0,0,0,.08);border-color:rgba(79,110,247,.3)}
.feature-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.feature-card h3{font-size:16px;font-weight:700;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text2);line-height:1.7}
.feature-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.feature-tags span{font-size:12px;background:var(--primary-light);color:var(--primary);padding:2px 8px;border-radius:4px}

/* ── 内测活动 ── */
.activity-section{padding:56px 0;background:#fff}
.activity-card{background:linear-gradient(135deg,#EEF1FE,#F5F0FF);border-radius:20px;padding:48px;display:flex;gap:48px;align-items:center;flex-wrap:wrap}
.activity-left{flex:1;min-width:280px}
.activity-badge{display:inline-block;background:linear-gradient(135deg,#4F6EF7,#7C3AED);color:#fff;font-size:13px;padding:4px 14px;border-radius:20px;margin-bottom:16px;font-weight:600}
.activity-left h2{font-size:32px;font-weight:800;margin-bottom:20px;line-height:1.3}
.activity-left h2 span{color:var(--primary)}
.activity-list{list-style:none;margin-bottom:28px}
.activity-list li{padding:6px 0;font-size:15px;color:var(--text2)}
.activity-right{flex:1;min-width:240px}
.activity-steps{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap}
.step{text-align:center}
.step-num{width:44px;height:44px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;margin:0 auto 8px}
.step div:last-child{font-size:13px;color:var(--text2)}
.step-arrow{font-size:20px;color:var(--primary);font-weight:700}

/* ── 会员套餐 ── */
.pricing-section{padding:72px 0}
.pricing-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.plan-card{background:var(--card);border:1.5px solid var(--border);border-radius:14px;padding:28px;text-align:center;transition:.2s;position:relative}
.plan-card:hover{border-color:var(--primary);transform:translateY(-3px)}
.plan-card.hot{border-color:var(--primary);background:var(--primary-light)}
.plan-hot{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,#4F6EF7,#7C3AED);color:#fff;font-size:12px;padding:3px 14px;border-radius:10px;white-space:nowrap;font-weight:600}
.plan-days{font-size:20px;font-weight:800;margin-bottom:8px}
.plan-price{font-size:32px;font-weight:800;color:var(--primary);margin-bottom:8px}
.plan-desc{font-size:13px;color:var(--text2)}

/* ── 下载 ── */
.download-section{background:linear-gradient(135deg,#1E1B4B,#312E81,#4F6EF7);color:#fff;padding:80px 24px}
.download-section h2{font-size:34px;font-weight:800;margin-bottom:12px}
.download-section p{font-size:16px;opacity:.8;margin-bottom:32px}

/* ── 底部 ── */
.footer{background:#0F172A;color:#64748B;padding:48px 24px 24px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand p{font-size:13px;margin-top:8px;line-height:1.8}
.footer-links-group h4{color:#fff;font-size:14px;margin-bottom:12px}
.footer-links-group a{display:block;font-size:13px;color:#64748B;margin-bottom:8px;transition:.2s}
.footer-links-group a:hover{color:#fff}
.footer-bottom{border-top:1px solid #1E293B;padding-top:20px;text-align:center;font-size:12px}

/* ── 页面通用 ── */
.page-hero{background:linear-gradient(135deg,#EEF1FE,#F5F0FF);padding:56px 24px;text-align:center}
.page-hero h1{font-size:36px;font-weight:800;margin-bottom:12px}
.page-hero p{font-size:16px;color:var(--text2)}
.page-content{max-width:900px;margin:0 auto;padding:48px 24px}

/* ── 表单 ── */
.form-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:40px;max-width:480px;margin:0 auto}
.form-card h2{font-size:24px;font-weight:800;margin-bottom:8px}
.form-card p{color:var(--text2);font-size:14px;margin-bottom:28px}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:13px;color:var(--text2);margin-bottom:6px;font-weight:500}
.form-group input{width:100%;height:44px;border:1.5px solid var(--border);border-radius:8px;padding:0 14px;font-size:14px;font-family:inherit;transition:.2s;background:#F8FAFC}
.form-group input:focus{outline:none;border-color:var(--primary);background:#fff}
.form-row{display:flex;gap:8px}
.form-row input{flex:1}
.form-row .btn-outline{white-space:nowrap;height:44px;padding:0 16px}
.form-submit{width:100%;height:44px;background:var(--primary);color:#fff;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;font-family:inherit;transition:.2s;margin-top:8px}
.form-submit:hover{background:var(--primary-dark)}
.form-footer{text-align:center;margin-top:20px;font-size:13px;color:var(--text2)}
.form-footer a{color:var(--primary);font-weight:600}
.form-error{color:#EF4444;font-size:13px;margin-top:8px;display:none}
.form-success{color:#10B981;font-size:13px;margin-top:8px;display:none}

/* ── FAQ ── */
.faq-item{border:1px solid var(--border);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq-q{padding:16px 20px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;background:var(--card);transition:.2s}
.faq-q:hover{background:var(--primary-light)}
.faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:.3s;color:var(--text2);font-size:14px;line-height:1.8}
.faq-item.open .faq-a{padding:16px 20px;max-height:500px}
.faq-item.open .faq-q{background:var(--primary-light);color:var(--primary)}

/* ── 建议墙 ── */
.suggestion-form{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:28px;margin-bottom:32px}
.suggestion-form textarea{width:100%;height:100px;border:1.5px solid var(--border);border-radius:8px;padding:12px;font-size:14px;font-family:inherit;resize:vertical;transition:.2s}
.suggestion-form textarea:focus{outline:none;border-color:var(--primary)}
.suggestion-list{display:flex;flex-direction:column;gap:12px}
.suggestion-item{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px}
.suggestion-item .s-meta{font-size:12px;color:var(--text2);margin-bottom:8px}
.suggestion-item .s-content{font-size:14px;line-height:1.7}
.suggestion-item .s-votes{margin-top:12px;display:flex;gap:8px;align-items:center}
.vote-btn{background:var(--primary-light);color:var(--primary);border:none;padding:4px 12px;border-radius:6px;cursor:pointer;font-size:13px;font-family:inherit;transition:.2s}
.vote-btn:hover{background:var(--primary);color:#fff}

/* ── 响应式 ── */
@media(max-width:900px){
  .hero{flex-direction:column;padding:48px 24px;gap:40px}
  .hero-img{max-width:100%}
  h1{font-size:32px}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .pricing-grid{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
  .activity-card{flex-direction:column;padding:32px}
}
@media(max-width:600px){
  .features-grid,.pricing-grid{grid-template-columns:1fr}
  .nav-links,.nav-actions{display:none;flex-direction:column;position:absolute;top:60px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);padding:16px 24px;gap:8px}
  .nav-links.open,.nav-actions.open{display:flex}
  .nav-toggle{display:block}
  .navbar{position:relative}
  h1{font-size:26px}
  .footer-top{grid-template-columns:1fr}
}