/* ===== 第1套：清爽简约风 - 安全下载中心 ===== */

/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;line-height:1.6;color:#333;background:#f8fafc;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:#1a73e8;transition:color .2s}
a:hover{color:#1557b0}
img{max-width:100%;height:auto}

/* Container */
.container{width:92%;max-width:1200px;margin:0 auto;padding:0 16px}

/* ===== Header & Nav ===== */
.header{background:#fff;border-bottom:1px solid #e2e8f0;position:sticky;top:0;z-index:100}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-brand{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;color:#1a73e8}
.nav-brand svg{width:28px;height:28px}
.nav-menu{display:flex;list-style:none;gap:4px}
.nav-menu li a{display:block;padding:10px 18px;border-radius:6px;color:#475569;font-size:.9375rem;font-weight:500;transition:all .2s}
.nav-menu li a:hover{background:#f1f5f9;color:#1a73e8}
.nav-menu li a.active{background:#1a73e8;color:#fff}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;border-radius:8px;font-size:1rem;font-weight:600;border:none;cursor:pointer;transition:all .2s}
.btn-primary{background:#1a73e8;color:#fff}
.btn-primary:hover{background:#1557b0;transform:translateY(-1px);box-shadow:0 4px 12px rgba(26,115,232,.25)}
.btn-secondary{background:#fff;color:#1a73e8;border:2px solid #1a73e8}
.btn-secondary:hover{background:#1a73e8;color:#fff}
.btn-large{padding:14px 36px;font-size:1.125rem;border-radius:10px}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#f8fafc 0%,#e0f2fe 50%,#dbeafe 100%);padding:80px 0 60px;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;background:#dbeafe;color:#1e40af;border-radius:20px;font-size:.875rem;margin-bottom:20px}
.hero h1{font-size:2.75rem;font-weight:800;color:#0f172a;line-height:1.2;margin-bottom:16px;letter-spacing:-.02em}
.hero h1 span{color:#1a73e8}
.hero-subtitle{font-size:1.125rem;color:#475569;max-width:640px;margin:0 auto 32px;line-height:1.7}
.hero-meta{display:flex;align-items:center;justify-content:center;gap:24px;margin-top:24px;font-size:.875rem;color:#64748b}
.hero-meta span{display:flex;align-items:center;gap:6px}

/* ===== Section Common ===== */
.section{padding:60px 0}
.section-title{text-align:center;font-size:2rem;font-weight:700;color:#0f172a;margin-bottom:12px}
.section-subtitle{text-align:center;color:#475569;font-size:1rem;margin-bottom:40px}
.section-header{margin-bottom:40px}

/* ===== Feature Cards ===== */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.feature-card{background:#fff;border-radius:12px;padding:28px;border:1px solid #e2e8f0;transition:all .2s}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 12px 24px rgba(0,0,0,.06);border-color:#bfdbfe}
.feature-icon{width:48px;height:48px;background:#dbeafe;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:#1a73e8}
.feature-card h3{font-size:1.125rem;font-weight:700;color:#0f172a;margin-bottom:10px}
.feature-card p{color:#475569;font-size:.9375rem;line-height:1.7}

/* ===== Platform Cards ===== */
.platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}
.platform-card{background:#fff;border-radius:12px;padding:24px;text-align:center;border:1px solid #e2e8f0;transition:all .2s}
.platform-card:hover{box-shadow:0 8px 20px rgba(0,0,0,.06);border-color:#bfdbfe}
.platform-icon{width:44px;height:44px;margin:0 auto 14px;color:#475569}
.platform-card h4{font-size:1rem;font-weight:600;color:#0f172a;margin-bottom:6px}
.platform-card p{font-size:.8125rem;color:#64748b;margin-bottom:14px}
.platform-card .btn{padding:8px 20px;font-size:.875rem}

/* ===== Deep Features ===== */
.deep-feature{display:flex;align-items:center;gap:48px;margin-bottom:48px}
.deep-feature:nth-child(even){flex-direction:row-reverse}
.deep-feature-content{flex:1}
.deep-feature-content h3{font-size:1.5rem;font-weight:700;color:#0f172a;margin-bottom:14px}
.deep-feature-content p{color:#475569;line-height:1.8;margin-bottom:12px}
.deep-feature-visual{flex:0 0 320px;height:220px;background:linear-gradient(135deg,#dbeafe,#e0f2fe);border-radius:16px;display:flex;align-items:center;justify-content:center;color:#1a73e8;font-size:4rem}

/* ===== Stats ===== */
.stats-bar{background:#0f172a;color:#fff;padding:48px 0}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;text-align:center}
.stat-number{font-size:2.5rem;font-weight:800;color:#60a5fa;margin-bottom:6px}
.stat-label{font-size:.9375rem;color:#94a3b8}

/* ===== Testimonials ===== */
.testimonials-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.testimonial-card{background:#fff;border-radius:12px;padding:24px;border:1px solid #e2e8f0}
.testimonial-stars{color:#f59e0b;margin-bottom:12px;font-size:1rem;display:flex;gap:2px}
.testimonial-text{color:#334155;font-size:.9375rem;line-height:1.7;margin-bottom:16px}
.testimonial-author{display:flex;align-items:center;gap:12px}
.testimonial-avatar{width:40px;height:40px;background:linear-gradient(135deg,#1a73e8,#60a5fa);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.875rem}
.testimonial-author-info h5{font-size:.9375rem;font-weight:600;color:#0f172a}
.testimonial-author-info span{font-size:.8125rem;color:#64748b}

/* ===== Browser Comparison ===== */
.compare-table{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;border:1px solid #e2e8f0}
.compare-table th{background:#f1f5f9;padding:14px 16px;text-align:left;font-weight:600;color:#0f172a;font-size:.9375rem}
.compare-table td{padding:14px 16px;border-top:1px solid #e2e8f0;font-size:.9375rem;color:#475569}
.compare-table tr.highlight td{background:#eff6ff}
.compare-table .check{color:#16a34a;font-weight:700}
.compare-table .cross{color:#dc2626}

/* ===== Scenarios ===== */
.scenario-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px}
.scenario-card{background:#fff;border-radius:12px;padding:28px;text-align:center;border:1px solid #e2e8f0}
.scenario-icon{width:56px;height:56px;background:#dbeafe;border-radius:14px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;color:#1a73e8}
.scenario-card h4{font-size:1.0625rem;font-weight:600;color:#0f172a;margin-bottom:8px}
.scenario-card p{font-size:.875rem;color:#475569;line-height:1.6}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;padding:20px 24px;margin-bottom:12px;border:1px solid #e2e8f0}
.faq-item h4{font-size:1rem;font-weight:600;color:#0f172a;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.faq-item p{color:#475569;font-size:.9375rem;line-height:1.7}

/* ===== Download Page ===== */
.download-hero{background:linear-gradient(135deg,#0f172a,#1e3a5f);color:#fff;padding:60px 0;text-align:center}
.download-hero h1{font-size:2.25rem;font-weight:800;margin-bottom:12px}
.download-hero p{color:#94a3b8;margin-bottom:24px}
.download-main-card{background:#fff;border-radius:16px;padding:40px;text-align:center;max-width:600px;margin:0 auto;box-shadow:0 20px 40px rgba(0,0,0,.1)}
.download-meta{display:flex;justify-content:center;gap:24px;margin-top:20px;font-size:.875rem;color:#475569}
.download-meta span{display:flex;align-items:center;gap:6px}

/* Download Cards */
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
.download-card{background:#fff;border-radius:12px;padding:28px;border:1px solid #e2e8f0;text-align:center}
.download-card h3{font-size:1.125rem;font-weight:700;color:#0f172a;margin:12px 0 4px}
.download-card .version{font-size:.8125rem;color:#64748b;margin-bottom:12px}

/* Steps */
.steps{display:flex;gap:20px;flex-wrap:wrap;justify-content:center}
.step{flex:1;min-width:200px;max-width:260px;text-align:center}
.step-num{width:40px;height:40px;background:#1a73e8;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;margin:0 auto 12px}
.step h4{font-size:1rem;font-weight:600;color:#0f172a;margin-bottom:8px}
.step p{font-size:.875rem;color:#475569;line-height:1.6}

/* System Requirements */
.sys-table{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;border:1px solid #e2e8f0}
.sys-table th{background:#f1f5f9;padding:12px 16px;text-align:left;font-weight:600;color:#0f172a;font-size:.875rem}
.sys-table td{padding:12px 16px;border-top:1px solid #e2e8f0;font-size:.875rem;color:#475569}

/* Version Log */
.version-log .log-item{padding:20px 0;border-bottom:1px solid #e2e8f0}
.version-log .log-item:last-child{border-bottom:none}
.log-version{font-size:1.0625rem;font-weight:700;color:#0f172a;margin-bottom:6px}
.log-date{font-size:.8125rem;color:#64748b;margin-bottom:8px}
.log-list{margin:0;padding-left:20px;color:#475569;font-size:.9375rem;line-height:1.7}

/* FAQ Accordion */
.accordion-item{background:#fff;border-radius:10px;margin-bottom:10px;border:1px solid #e2e8f0;overflow:hidden}
.accordion-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;cursor:pointer;font-weight:600;color:#0f172a;transition:background .2s}
.accordion-header:hover{background:#f8fafc}
.accordion-header::after{content:"+";font-size:1.25rem;color:#64748b;transition:transform .2s}
.accordion-item.active .accordion-header::after{transform:rotate(45deg)}
.accordion-body{max-height:0;overflow:hidden;transition:max-height .3s}
.accordion-item.active .accordion-body{max-height:500px}
.accordion-body-inner{padding:0 20px 16px;color:#475569;font-size:.9375rem;line-height:1.7}

/* ===== ZH-CN Page ===== */
.article-content{max-width:860px;margin:0 auto;background:#fff;border-radius:16px;padding:40px;border:1px solid #e2e8f0}
.article-content h2{font-size:1.5rem;font-weight:700;color:#0f172a;margin:32px 0 16px;padding-bottom:8px;border-bottom:2px solid #e2e8f0}
.article-content h3{font-size:1.25rem;font-weight:600;color:#1e293b;margin:24px 0 12px}
.article-content p{color:#334155;line-height:1.9;margin-bottom:14px;font-size:.9375rem}
.article-content ul,.article-content ol{margin:12px 0;padding-left:24px;color:#334155;line-height:1.9}
.article-content li{margin-bottom:6px}
.article-content strong{color:#0f172a}
.tip-box{background:#eff6ff;border-left:4px solid #1a73e8;padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0}
.tip-box p{margin:0;color:#1e40af}

/* ===== Footer ===== */
.footer{background:#0f172a;color:#94a3b8;padding:32px 0;text-align:center;font-size:.875rem}
.footer p{margin:4px 0}
.footer a{color:#60a5fa}

/* ===== Spin Animation ===== */
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== Responsive ===== */
@media(max-width:768px){
  .nav{flex-wrap:wrap;height:auto;padding:12px 0}
  .nav-menu{width:100%;justify-content:center;margin-top:8px}
  .hero h1{font-size:2rem}
  .hero{padding:48px 0 36px}
  .deep-feature,.deep-feature:nth-child(even){flex-direction:column}
  .deep-feature-visual{flex:none;width:100%}
  .section{padding:40px 0}
  .features-grid,.testimonials-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .article-content{padding:24px}
}
@media(max-width:480px){
  .hero h1{font-size:1.625rem}
  .nav-menu{gap:2px}
  .nav-menu li a{padding:8px 12px;font-size:.8125rem}
  .stats-grid{grid-template-columns:1fr}
  .platform-grid{grid-template-columns:1fr}
}