/* ===== Site 6: Bold Flat Red Theme ===== */
:root {
  --primary: #dc2626;
  --primary-dark: #991b1b;
  --primary-light: #ef4444;
  --accent: #1d4ed8;
  --text: #18181b;
  --text-light: #52525b;
  --text-muted: #a1a1aa;
  --bg: #ffffff;
  --bg-alt: #fafafa;
  --bg-dark: #18181b;
  --border: #e4e4e7;
  --radius: 4px;
  --radius-lg: 8px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Inter","Segoe UI",system-ui,-apple-system,sans-serif;color:var(--text);line-height:1.65;background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none;font-weight:500}a:hover{color:var(--primary-dark)}

@keyframes spin{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}

/* Header - flat bold */
.site-header{background:var(--bg-dark);position:sticky;top:0;z-index:100}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 28px;display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:#fff;letter-spacing:-0.5px}
.nav-links{display:flex;align-items:center;gap:0;list-style:none}
.nav-links a{display:block;padding:10px 22px;font-size:14px;font-weight:600;color:#a1a1aa;transition:all .15s;text-transform:uppercase;letter-spacing:0.5px}
.nav-links a:hover,.nav-links a.active{color:#fff;background:var(--primary)}

/* Hero - bold flat */
.hero{background:var(--bg-dark);padding:80px 28px 70px;color:#fff}
.hero-inner{max-width:1200px;margin:0 auto}
.hero h1{font-size:56px;font-weight:900;line-height:1.05;margin-bottom:20px;letter-spacing:-2px;text-transform:uppercase}
.hero h1 .red{color:var(--primary)}
.hero-sub{font-size:18px;color:#a1a1aa;line-height:1.75;margin-bottom:36px;max-width:560px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;font-size:14px;font-weight:700;cursor:pointer;border:none;transition:all .15s;text-transform:uppercase;letter-spacing:0.5px}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-light);transform:translateY(-2px)}
.btn-outline{background:transparent;color:#fff;border:2px solid #3f3f46}
.btn-outline:hover{border-color:#fff}
.btn-large{padding:16px 40px;font-size:16px}

/* Section */
.section{padding:72px 28px}.section-alt{background:var(--bg-alt)}
.container{max-width:1200px;margin:0 auto}
.section-header{margin-bottom:48px}
.section-header h2{font-size:36px;font-weight:900;color:var(--text);text-transform:uppercase;letter-spacing:-1px;margin-bottom:12px}
.section-header h2 .red{color:var(--primary)}
.section-header p{font-size:16px;color:var(--text-light);max-width:560px}

/* Feature cards - flat tiles */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1px;background:var(--border)}
.feature-card{background:var(--bg);padding:36px;transition:all .15s}
.feature-card:hover{background:var(--bg-alt)}
.feature-icon{width:48px;height:48px;background:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:20px;color:#fff;font-size:22px;border-radius:var(--radius))}
.feature-card h3{font-size:18px;font-weight:800;margin-bottom:10px;text-transform:uppercase;letter-spacing:-0.5px}
.feature-card p{font-size:14px;color:var(--text-light);line-height:1.75}

/* Platforms - bold cards */
.platforms{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:40px}
.platform-card{background:var(--bg);border:2px solid var(--border);padding:32px 20px;text-align:center;transition:all .15s}
.platform-card:hover{border-color:var(--primary)}
.platform-icon{width:56px;height:56px;background:var(--bg-dark);display:flex;align-items:center;justify-content:center;margin:0 auto 18px;color:#fff}
.platform-card h4{font-size:18px;font-weight:800;margin-bottom:6px;text-transform:uppercase}
.platform-card p{font-size:13px;color:var(--text-muted);margin-bottom:18px;line-height:1.6}
.platform-card .btn{padding:10px 24px;font-size:13px}

/* Deep features */
.deep-feature{display:grid;grid-template-columns:1.1fr 0.9fr;gap:56px;align-items:center;margin-bottom:72px}
.deep-feature:nth-child(even){grid-template-columns:0.9fr 1.1fr;direction:rtl}
.deep-feature:nth-child(even)>*{direction:ltr}
.deep-feature:last-child{margin-bottom:0}
.deep-content h3{font-size:28px;font-weight:900;margin-bottom:16px;text-transform:uppercase;letter-spacing:-1px}
.deep-content h3 .red{color:var(--primary)}
.deep-content p{font-size:15px;color:var(--text-light);line-height:1.8;margin-bottom:14px}
.deep-visual{background:var(--bg-alt);padding:48px;display:flex;align-items:center;justify-content:center;min-height:260px;border:2px solid var(--border)}

/* Reviews */
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.review-card{background:var(--bg);border:2px solid var(--border);padding:28px}
.review-stars{color:var(--primary);margin-bottom:14px;font-size:16px;letter-spacing:2px}
.review-text{font-size:14px;color:var(--text);line-height:1.8;margin-bottom:20px;font-weight:400}
.review-author{display:flex;align-items:center;gap:12px}
.review-avatar{width:40px;height:40px;background:var(--bg-dark);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:14px}
.review-author strong{font-size:14px}
.review-author span{font-size:12px;color:var(--text-muted)}

/* Stats */
.stats-bar{background:var(--primary);padding:56px 28px}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;max-width:1200px;margin:0 auto;text-align:center}
.stat-item h4{font-size:44px;font-weight:900;color:#fff;margin-bottom:6px}
.stat-item p{font-size:14px;color:rgba(255,255,255,0.8);text-transform:uppercase;font-weight:600}

/* Compare table - brutalist */
.compare-table{width:100%;border-collapse:collapse;margin-top:32px;border:2px solid var(--border)}
.compare-table th{background:var(--bg-dark);color:#fff;padding:14px 18px;text-align:left;font-weight:800;font-size:13px;text-transform:uppercase}
.compare-table td{padding:14px 18px;border-bottom:1px solid var(--border);font-size:14px;color:var(--text-light)}
.compare-table tr:last-child td{border-bottom:none}
.compare-table .check{color:#16a34a;font-weight:800}.compare-table .cross{color:var(--primary);font-weight:800}
.compare-table tr:hover td{background:var(--bg-alt)}

/* FAQ */
.faq-list{max-width:860px;margin:0 auto;display:flex;flex-direction:column;gap:0;border:2px solid var(--border)}
.faq-item{border-bottom:1px solid var(--border)}
.faq-item:last-child{border-bottom:none}
.faq-toggle{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;cursor:pointer;font-weight:800;font-size:15px;color:var(--text);background:none;border:none;width:100%;text-align:left;text-transform:uppercase}
.faq-toggle::after{content:'+';font-size:18px;color:var(--primary);font-weight:800}
.faq-item.active .faq-toggle::after{content:'−'}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 22px}
.faq-item.active .faq-answer{max-height:500px;padding:0 22px 18px}
.faq-answer p{font-size:14px;color:var(--text-light);line-height:1.8}

/* Download page */
.download-hero{background:var(--bg-dark);padding:72px 28px 56px;color:#fff}
.download-hero-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.download-hero h1{font-size:44px;font-weight:900;margin-bottom:16px;line-height:1.1;text-transform:uppercase;letter-spacing:-1px}
.download-hero h1 .red{color:var(--primary)}
.download-hero p{font-size:16px;color:#a1a1aa;margin-bottom:32px;line-height:1.8}
.download-meta{display:flex;gap:20px;margin-bottom:32px;flex-wrap:wrap}
.download-meta span{display:flex;align-items:center;gap:8px;font-size:13px;color:#71717a}
.download-card{background:#27272a;padding:40px;text-align:center;border:2px solid #3f3f46}
.download-card .platform-icon{background:#18181b;margin:0 auto 20px}
.download-card h3{font-size:22px;font-weight:800;margin-bottom:8px;color:#fff;text-transform:uppercase}
.download-card p{font-size:13px;color:#71717a;margin-bottom:20px}

/* Steps */
.steps{display:flex;flex-direction:column;gap:24px;margin-top:36px}
.step{display:grid;grid-template-columns:40px 1fr;gap:20px;align-items:start}
.step-num{width:40px;height:40px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:16px;flex-shrink:0}
.step-content h4{font-size:18px;font-weight:800;margin-bottom:8px;text-transform:uppercase}
.step-content p{font-size:14px;color:var(--text-light);line-height:1.8}

/* System req */
.sys-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:32px}
.sys-card{background:var(--bg);border:2px solid var(--border);padding:24px}
.sys-card h4{font-size:16px;font-weight:800;margin-bottom:14px;display:flex;align-items:center;gap:10px;color:var(--text);text-transform:uppercase}
.sys-card ul{list-style:none;display:flex;flex-direction:column;gap:8px}
.sys-card li{font-size:13px;color:var(--text-light);display:flex;justify-content:space-between;padding-bottom:8px;border-bottom:1px solid var(--border)}
.sys-card li:last-child{border-bottom:none}

/* Version history */
.version-list{display:flex;flex-direction:column;gap:0;margin-top:32px;border:2px solid var(--border)}
.version-item{padding:20px;display:grid;grid-template-columns:120px 1fr;gap:24px;border-bottom:1px solid var(--border)}
.version-item:last-child{border-bottom:none}
.version-item strong{color:var(--primary);font-size:15px;font-weight:800}
.version-item ul{list-style:none;display:flex;flex-direction:column;gap:6px}
.version-item li{font-size:14px;color:var(--text-light);padding-left:16px;position:relative}
.version-item li::before{content:'—';color:var(--primary);position:absolute;left:0;font-weight:800}

/* zh-cn page */
.content-article{max-width:860px;margin:0 auto;font-size:16px;line-height:1.85;color:var(--text-light)}
.content-article h2{font-size:32px;font-weight:900;margin:48px 0 20px;color:var(--text);text-transform:uppercase;letter-spacing:-1px}
.content-article h2 .red{color:var(--primary)}
.content-article h3{font-size:22px;font-weight:800;margin:32px 0 14px;color:var(--text);text-transform:uppercase}
.content-article p{margin-bottom:18px}
.content-article ul,.content-article ol{margin:0 0 18px 24px}
.content-article li{margin-bottom:8px}
.keyword-box{background:var(--bg-alt);border-left:4px solid var(--primary);padding:20px 24px;margin:24px 0}
.tips-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:16px;margin:28px 0}
.tip-card{background:var(--bg);border:2px solid var(--border);padding:24px}
.tip-card h4{font-size:16px;font-weight:800;margin-bottom:10px;color:var(--text);text-transform:uppercase}
.tip-card p{font-size:14px;color:var(--text-light);line-height:1.75}

/* CTA */
.cta-section{background:var(--primary);padding:72px 28px;text-align:center;color:#fff}
.cta-section h2{font-size:36px;font-weight:900;margin-bottom:14px;text-transform:uppercase;letter-spacing:-1px}
.cta-section p{font-size:16px;color:rgba(255,255,255,0.85);margin-bottom:28px;max-width:560px;margin-left:auto;margin-right:auto}
.cta-section .btn{background:var(--bg-dark);color:#fff}
.cta-section .btn:hover{background:#000;transform:translateY(-2px)}

/* Footer */
.site-footer{background:var(--bg-dark);color:#52525b;padding:36px 28px;text-align:center;font-size:13px}
.site-footer p{line-height:1.9}
.site-footer strong{color:#a1a1aa}

/* Responsive */
@media(max-width:900px){
  .hero h1{font-size:40px}
  .platforms{grid-template-columns:repeat(2,1fr)}
  .download-hero-inner{grid-template-columns:1fr}
  .deep-feature,.deep-feature:nth-child(even){grid-template-columns:1fr;direction:ltr}
  .deep-feature:nth-child(even)>*{direction:ltr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:600px){
  .hero h1{font-size:32px}
  .nav-links a{padding:8px 14px;font-size:11px}
  .section-header h2{font-size:26px}
  .features-grid{grid-template-columns:1fr}
  .platforms{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr}
}