*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:#1E1B2E;line-height:1.8;background:#fff;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit}
ul,ol{list-style:none}

:root{
  --primary:#6C5CE7;
  --primary-dark:#5541D9;
  --primary-light:#8B7CF0;
  --accent:#00CEC9;
  --accent2:#FF6B6B;
  --dark:#1E1B2E;
  --dark2:#2D2A3E;
  --gray:#5B5B73;
  --gray-light:#8E8EA6;
  --light:#F5F4FF;
  --light2:#EEECFF;
  --border:#E0DDF5;
  --success:#00CEC9;
  --warning:#FFB800;
  --danger:#FF5C5C;
  --radius:16px;
  --radius-sm:10px;
  --radius-lg:24px;
  --shadow:0 8px 32px rgba(108,92,231,.08);
  --shadow-lg:0 20px 60px rgba(108,92,231,.12);
  --transition:all .3s cubic-bezier(.4,0,.2,1)
}

.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* 顶部导航条 */
.top-announcement{background:linear-gradient(90deg,#1E1B2E,#6C5CE7 50%,#00CEC9);padding:10px 0;text-align:center;color:#fff;font-size:.85rem;letter-spacing:.5px}
.top-announcement span{color:#FFE066;font-weight:600}
.top-announcement i{margin-right:6px}

/* 导航 */
.header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.97);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);box-shadow:0 2px 20px rgba(0,0,0,.04)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.4rem;color:var(--dark)}
.logo-icon{width:42px;height:42px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900;font-size:1.1rem;box-shadow:0 4px 16px rgba(108,92,231,.3)}
.logo span{color:var(--primary)}

.nav{display:flex;align-items:center;gap:8px}
.nav a{padding:10px 18px;border-radius:var(--radius-sm);font-weight:500;color:var(--dark);font-size:.95rem;transition:var(--transition);position:relative}
.nav a:hover{color:var(--primary);background:rgba(108,92,231,.05)}
.nav a.active{color:var(--primary);font-weight:600}
.nav a.active::after{content:"";position:absolute;bottom:2px;left:50%;transform:translateX(-50%);width:20px;height:3px;background:var(--primary);border-radius:2px}

.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:999px;font-weight:600;font-size:.95rem;transition:var(--transition);cursor:pointer;border:none;font-family:inherit}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;box-shadow:0 6px 20px rgba(108,92,231,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(108,92,231,.45)}
.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-accent{background:linear-gradient(135deg,var(--accent),#00E6E0);color:#fff;box-shadow:0 6px 20px rgba(0,206,201,.35)}
.btn-accent:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,206,201,.45)}

.mobile-menu-btn{display:none;background:none;border:none;font-size:1.4rem;color:var(--dark);cursor:pointer;padding:8px}

@media(max-width:900px){
  .nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-lg);gap:4px}
  .nav.open{display:flex}
  .mobile-menu-btn{display:block}
}

/* 主视觉区 */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#F8F7FF 0%,#fff 100%);padding:80px 0 100px}
.hero::before{content:"";position:absolute;top:0;right:0;width:60%;height:100%;background:radial-gradient(ellipse at right center,rgba(108,92,231,.08) 0%,transparent 70%);pointer-events:none}
.hero::after{content:"";position:absolute;bottom:0;left:0;width:40%;height:60%;background:radial-gradient(ellipse at left bottom,rgba(0,206,201,.08) 0%,transparent 70%);pointer-events:none}

.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center;position:relative;z-index:1}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;background:#fff;border-radius:999px;font-size:.82rem;font-weight:600;color:var(--primary);box-shadow:var(--shadow);margin-bottom:20px;border:1px solid var(--border)}
.hero-badge .dot{width:8px;height:8px;background:var(--success);border-radius:50%;animation:pulse-glow 2s infinite}
@keyframes pulse-glow{0%,100%{box-shadow:0 0 0 0 rgba(0,206,201,.5)}70%{box-shadow:0 0 0 10px rgba(0,206,201,0)}100%{box-shadow:0 0 0 0 rgba(0,206,201,0)}}

.hero h1{font-size:3rem;font-weight:900;line-height:1.2;color:var(--dark);margin-bottom:20px;letter-spacing:-.5px}
.hero h1 .highlight{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-desc{font-size:1.1rem;color:var(--gray);margin-bottom:28px;max-width:540px;line-height:1.8}
.hero-btns{display:flex;gap:14px;margin-bottom:36px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;max-width:560px}
.hero-stat{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;text-align:center;transition:var(--transition)}
.hero-stat:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-3px)}
.hero-stat strong{display:block;font-size:1.5rem;font-weight:800;color:var(--primary);margin-bottom:4px}
.hero-stat span{font-size:.8rem;color:var(--gray-light)}

/* 通用板块标题 */
.section{padding:90px 0}
.section-alt{background:var(--light)}
.section-header{text-align:center;max-width:720px;margin:0 auto 60px}
.section-header .label{display:inline-block;font-size:.8rem;font-weight:700;color:var(--primary);text-transform:uppercase;letter-spacing:2px;margin-bottom:12px}
.section-header h2{font-size:2.4rem;font-weight:800;color:var(--dark);margin-bottom:16px;line-height:1.3}
.section-header p{font-size:1.05rem;color:var(--gray);max-width:600px;margin:0 auto}

/* 下载页面专用样式 */
/* 平台下载卡片 */
.download-platform-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1100px;margin:0 auto}
.download-platform-card{background:#fff;border-radius:var(--radius-lg);padding:36px 26px;border:1px solid var(--border);transition:var(--transition);position:relative;overflow:hidden;text-align:center}
.download-platform-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:transparent}
.download-platform-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary),var(--accent));transform:scaleX(0);transform-origin:left;transition:var(--transition)}
.download-platform-card:hover::before{transform:scaleX(1)}
.download-platform-card .platform-icon{width:80px;height:80px;margin:0 auto 20px;border-radius:20px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;display:flex;align-items:center;justify-content:center;font-size:2.2rem;box-shadow:0 8px 24px rgba(108,92,231,.25)}
.download-platform-card h3{font-size:1.35rem;font-weight:800;color:var(--dark);margin-bottom:6px}
.download-platform-card .version-info{font-size:.85rem;color:var(--gray-light);margin-bottom:14px}
.download-platform-card .dl-btn{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;padding:12px 28px;border-radius:999px;font-weight:600;font-size:.95rem;transition:var(--transition);box-shadow:0 6px 20px rgba(108,92,231,.3)}
.download-platform-card .dl-btn:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(108,92,231,.45)}
.download-platform-card .dl-meta{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;font-size:.78rem;color:var(--gray)}
.download-platform-card .dl-meta span{display:inline-flex;align-items:center;gap:5px}

/* 版本信息表 */
.version-table-wrap{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);max-width:1000px;margin:0 auto}
.version-table{width:100%;border-collapse:collapse}
.version-table thead{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff}
.version-table th{padding:16px 14px;text-align:left;font-weight:700;font-size:.92rem}
.version-table td{padding:14px;border-bottom:1px solid var(--border);font-size:.88rem;color:var(--dark)}
.version-table tbody tr:hover{background:rgba(108,92,231,.03)}
.version-table tbody tr:last-child td{border-bottom:none}
.version-table td:first-child{font-weight:700;color:var(--dark);background:rgba(108,92,231,.04)}
.version-table .badge-new{display:inline-block;background:var(--success);color:#fff;padding:2px 10px;border-radius:999px;font-size:.7rem;font-weight:700}

/* 安装步骤 */
.install-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;max-width:1100px;margin:0 auto}
.install-step-card{background:#fff;border-radius:var(--radius);padding:30px 22px;border:1px solid var(--border);transition:var(--transition);position:relative;overflow:hidden;text-align:center}
.install-step-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.install-step-card .step-num-badge{width:60px;height:60px;margin:0 auto 16px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-size:1.4rem;font-weight:800;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 20px rgba(108,92,231,.25)}
.install-step-card h4{font-size:1.1rem;font-weight:700;color:var(--dark);margin-bottom:8px}
.install-step-card p{font-size:.88rem;color:var(--gray);line-height:1.6}

/* 首次使用检查清单 */
.first-use-checklist{background:#fff;border-radius:var(--radius-lg);padding:40px;box-shadow:var(--shadow);border:1px solid var(--border);max-width:800px;margin:0 auto}
.checklist-row{display:flex;align-items:center;justify-content:space-between;padding:16px 0;border-bottom:1px solid var(--border)}
.checklist-row:last-child{border-bottom:none}
.checklist-row .checklist-label{font-weight:600;color:var(--dark);font-size:1rem;display:flex;align-items:center;gap:10px}
.checklist-row .checklist-label i{width:24px;text-align:center;font-size:1.1rem;color:var(--primary)}
.checklist-row .checklist-status{display:flex;align-items:center;gap:6px;font-size:.85rem;color:var(--success);font-weight:600}
.checklist-row .checklist-status::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--success);box-shadow:0 0 8px rgba(0,206,201,.5)}

/* 更新日志时间线 */
.changelog{background:#fff;border-radius:var(--radius-lg);padding:40px;box-shadow:var(--shadow);border:1px solid var(--border);max-width:800px;margin:0 auto}
.changelog-item{display:flex;gap:20px;margin-bottom:24px;position:relative}
.changelog-item::before{content:"";position:absolute;left:9px;top:28px;bottom:-16px;width:2px;background:linear-gradient(180deg,var(--primary),var(--accent));opacity:.3}
.changelog-item:last-child::before{display:none}
.changelog-item .version-dot{width:20px;height:20px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));flex-shrink:0;margin-top:4px;box-shadow:0 0 12px rgba(108,92,231,.4);position:relative;z-index:1}
.changelog-item .changelog-content h4{font-size:1.1rem;font-weight:700;color:var(--dark);margin-bottom:6px}
.changelog-item .changelog-content .changelog-date{font-size:.78rem;color:var(--gray-light);margin-bottom:8px}
.changelog-item .changelog-content ul{list-style:disc;padding-left:20px}
.changelog-item .changelog-content ul li{font-size:.88rem;color:var(--gray);margin-bottom:4px}

/* 下载统计横幅 */
.download-stats-banner{background:var(--dark);color:#fff;border-radius:var(--radius-lg);padding:50px 40px;text-align:center;position:relative;overflow:hidden}
.download-stats-banner::before{content:"";position:absolute;top:-50px;right:-50px;width:250px;height:250px;background:radial-gradient(circle,rgba(108,92,231,.4),transparent);border-radius:50%}
.download-stats-banner::after{content:"";position:absolute;bottom:-50px;left:-50px;width:250px;height:250px;background:radial-gradient(circle,rgba(0,206,201,.4),transparent);border-radius:50%}
.download-stats-banner h3{font-size:2rem;font-weight:800;margin-bottom:24px;position:relative;z-index:1}
.download-stats-banner .dl-stats-grid{display:flex;justify-content:center;gap:40px;flex-wrap:wrap;position:relative;z-index:1}
.download-stats-banner .dl-stat-item{text-align:center}
.download-stats-banner .dl-stat-item strong{font-size:2.6rem;font-weight:800;background:linear-gradient(135deg,#fff,var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;display:block}
.download-stats-banner .dl-stat-item span{color:rgba(255,255,255,.7);font-size:.9rem}

/* FAQ */
.faq-section{background:var(--light)}
.faq-grid{display:grid;grid-template-columns:1fr 1.3fr;gap:50px;align-items:start}
.faq-intro h3{font-size:1.8rem;font-weight:800;color:var(--dark);margin-bottom:14px}
.faq-intro > p{color:var(--gray);margin-bottom:24px}
.faq-highlight{background:#fff;border-left:4px solid var(--primary);padding:18px 20px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin-bottom:16px}
.faq-highlight strong{color:var(--primary);font-weight:700;display:block;margin-bottom:4px}
.faq-highlight small{color:var(--gray);font-size:.85rem}

.faq-list .faq-item{background:#fff;border-radius:var(--radius);margin-bottom:14px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.04);border:1px solid var(--border)}
.faq-q{width:100%;padding:20px 24px;background:none;border:none;text-align:left;font-size:1rem;font-weight:600;color:var(--dark);cursor:pointer;font-family:inherit;display:flex;justify-content:space-between;align-items:center;gap:16px;transition:var(--transition)}
.faq-q:hover{color:var(--primary)}
.faq-item.open .faq-q{color:var(--primary)}
.faq-q i{transition:transform .3s;color:var(--gray-light)}
.faq-item.open .faq-q i{transform:rotate(180deg);color:var(--primary)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.faq-item.open .faq-a{max-height:800px;padding:0 24px 24px}
.faq-a p{margin-bottom:12px;color:var(--gray);font-size:.95rem}

.step-answer{counter-reset:step-ans}
.step-answer li{counter-increment:step-ans;padding:12px 0 12px 44px;position:relative;font-size:.95rem;color:var(--dark);border-bottom:1px dashed var(--border)}
.step-answer li:last-child{border-bottom:none}
.step-answer li::before{content:counter(step-ans);position:absolute;left:0;top:10px;width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-weight:700;font-size:.8rem;display:flex;align-items:center;justify-content:center}
.step-answer li strong{color:var(--dark);font-weight:700;display:block;margin-bottom:2px}
.step-answer li small{color:var(--gray);font-size:.85rem}

@media(max-width:960px){.faq-grid{grid-template-columns:1fr}}

/* CTA */
.cta-wrap{background:linear-gradient(135deg,var(--primary),#7C6FF0 50%,var(--accent));border-radius:24px;margin:0 24px;padding:80px 40px;text-align:center;color:#fff;position:relative;overflow:hidden}
.cta-wrap::before{content:"";position:absolute;top:-50%;right:-20%;width:500px;height:500px;background:radial-gradient(circle,rgba(255,255,255,.15),transparent);border-radius:50%}
.cta-wrap h2{font-size:2.4rem;font-weight:800;margin-bottom:14px;position:relative;z-index:1}
.cta-wrap p{font-size:1.1rem;opacity:.9;margin-bottom:30px;max-width:560px;margin-left:auto;margin-right:auto;position:relative;z-index:1}
.cta-wrap .btn{background:#fff;color:var(--primary);font-size:1.05rem;padding:14px 32px;position:relative;z-index:1}
.cta-wrap .btn:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(0,0,0,.2)}

/* 页脚 */
.footer{background:var(--dark);color:rgba(255,255,255,.7);padding:70px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin-bottom:50px}
.footer-brand .logo{color:#fff;margin-bottom:16px}
.footer-brand p{font-size:.9rem;opacity:.7;line-height:1.8;margin-bottom:20px}
.footer-social{display:flex;gap:12px}
.footer-social a{width:40px;height:40px;border-radius:10px;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;color:#fff;transition:var(--transition)}
.footer-social a:hover{background:var(--primary);transform:translateY(-3px)}

.footer h4{color:#fff;font-size:1rem;font-weight:700;margin-bottom:20px}
.footer ul li{margin-bottom:12px}
.footer ul li a{font-size:.9rem;opacity:.7;transition:var(--transition)}
.footer ul li a:hover{opacity:1;color:#fff}

.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:30px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;font-size:.85rem;opacity:.6}
.footer-bottom a:hover{opacity:1;color:#fff}
.footer-bottom .legal{display:flex;gap:20px}

@media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}

/* 浮动工具 */
.float-btns{position:fixed;right:24px;bottom:24px;z-index:999;display:flex;flex-direction:column;gap:12px}
.float-btns a{width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 24px rgba(108,92,231,.4);transition:var(--transition);font-size:1.1rem}
.float-btns a:hover{transform:translateY(-4px) scale(1.05)}

/* Toast */
.toast-msg{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(100px);background:var(--dark);color:#fff;padding:14px 28px;border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);transition:transform .4s ease;z-index:9999;font-size:.92rem;display:flex;align-items:center;gap:10px}
.toast-msg.show{transform:translateX(-50%) translateY(0)}
.toast-msg i{color:var(--success)}

/* 响应式 */
@media(max-width:900px){
  .download-platform-grid{grid-template-columns:repeat(2,1fr)}
  .install-steps{grid-template-columns:repeat(2,1fr);gap:20px}
  .version-table-wrap{overflow-x:auto}
  .version-table{min-width:650px}
}
@media(max-width:560px){
  .download-platform-grid{grid-template-columns:1fr}
  .install-steps{grid-template-columns:1fr}
}