/* ===== Site 1: Corporate Professional Blue Theme ===== */
:root {
  --primary: #1565c0;
  --primary-dark: #0d47a1;
  --primary-light: #42a5f5;
  --secondary: #ff6f00;
  --text: #263238;
  --text-light: #546e7a;
  --bg: #ffffff;
  --bg-light: #f5f7fa;
  --bg-dark: #0d1b2a;
  --border: #dde3e9;
  --shadow: 0 2px 12px rgba(13,71,161,0.08);
  --shadow-lg: 0 8px 30px rgba(13,71,161,0.12);
  --radius: 8px;
  --radius-lg: 12px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",system-ui,-apple-system,sans-serif;color:var(--text);line-height:1.6;background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-dark)}

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

/* Header & Nav */
.site-header{background:var(--bg);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:700;color:var(--primary-dark)}
.logo svg{flex-shrink:0}
.nav-links{display:flex;align-items:center;gap:6px;list-style:none}
.nav-links a{display:block;padding:10px 18px;border-radius:var(--radius);font-size:15px;font-weight:500;color:var(--text-light);transition:all .2s}
.nav-links a:hover,.nav-links a.active{background:var(--primary);color:#fff}

/* Hero */
.hero{background:linear-gradient(135deg,#0d1b2a 0%,#1565c0 100%);color:#fff;padding:100px 24px 90px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-50%;right:-20%;width:600px;height:600px;background:rgba(255,255,255,0.03);border-radius:50%}
.hero-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;position:relative;z-index:1}
.hero h1{font-size:52px;font-weight:800;line-height:1.15;margin-bottom:20px;letter-spacing:-1px}
.hero h1 span{color:var(--primary-light)}
.hero-sub{font-size:20px;color:rgba(255,255,255,0.85);margin-bottom:36px;max-width:520px;line-height:1.7}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;border-radius:var(--radius);font-size:16px;font-weight:600;cursor:pointer;border:none;transition:all .2s}
.btn-primary{background:var(--secondary);color:#fff;box-shadow:0 4px 14px rgba(255,111,0,0.35)}
.btn-primary:hover{background:#e65100;transform:translateY(-2px);box-shadow:0 6px 20px rgba(255,111,0,0.45)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,0.4)}
.btn-outline:hover{background:rgba(255,255,255,0.1);border-color:#fff}
.btn-large{padding:16px 40px;font-size:18px}
.hero-visual{display:flex;justify-content:center;align-items:center}
.hero-visual svg{filter:drop-shadow(0 20px 40px rgba(0,0,0,0.25))}

/* Section commons */
.section{padding:80px 24px}.section-alt{background:var(--bg-light)}
.container{max-width:1200px;margin:0 auto}
.section-header{text-align:center;margin-bottom:56px}
.section-header h2{font-size:38px;font-weight:700;color:var(--text);margin-bottom:12px}
.section-header p{font-size:18px;color:var(--text-light);max-width:640px;margin:0 auto}

/* Feature cards */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:24px}
.feature-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:36px;transition:all .25s}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--primary-light)}
.feature-icon{width:52px;height:52px;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;margin-bottom:20px;background:rgba(21,101,192,0.08)}
.feature-icon svg{color:var(--primary)}
.feature-card h3{font-size:20px;font-weight:700;margin-bottom:12px;color:var(--text)}
.feature-card p{font-size:15px;color:var(--text-light);line-height:1.7}

/* Download platforms */
.platforms{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;margin-top:40px}
.platform-card{background:#fff;border:2px solid var(--border);border-radius:var(--radius-lg);padding:32px;text-align:center;transition:all .2s}
.platform-card:hover{border-color:var(--primary);box-shadow:var(--shadow-lg)}
.platform-icon{width:56px;height:56px;margin:0 auto 16px;background:var(--bg-light);border-radius:var(--radius);display:flex;align-items:center;justify-content:center}
.platform-card h4{font-size:18px;font-weight:600;margin-bottom:6px}
.platform-card p{font-size:14px;color:var(--text-light);margin-bottom:16px}
.platform-card .btn{padding:10px 24px;font-size:14px}

/* Deep features */
.deep-feature{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;margin-bottom:80px}
.deep-feature:nth-child(even){direction:rtl}
.deep-feature:nth-child(even)>*{direction:ltr}
.deep-feature:last-child{margin-bottom:0}
.deep-content h3{font-size:28px;font-weight:700;margin-bottom:16px;color:var(--text)}
.deep-content p{font-size:16px;color:var(--text-light);line-height:1.8;margin-bottom:16px}
.deep-visual{background:var(--bg-light);border-radius:var(--radius-lg);padding:40px;display:flex;align-items:center;justify-content:center;min-height:280px}

/* Reviews */
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.review-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px}
.review-stars{color:#ffb300;margin-bottom:14px;font-size:18px;letter-spacing:2px}
.review-text{font-size:15px;color:var(--text);line-height:1.7;margin-bottom:20px;font-style:italic}
.review-author{display:flex;align-items:center;gap:14px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-light));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;font-size:16px}
.review-author strong{font-size:15px;color:var(--text)}
.review-author span{font-size:13px;color:var(--text-light)}

/* Stats */
.stats-bar{background:linear-gradient(90deg,var(--primary-dark),var(--primary));padding:60px 24px}
.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:42px;font-weight:800;color:#fff;margin-bottom:6px}
.stat-item p{font-size:15px;color:rgba(255,255,255,0.8)}

/* Comparison table */
.compare-table{width:100%;border-collapse:collapse;margin-top:32px;background:#fff;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow)}
.compare-table th{background:var(--primary-dark);color:#fff;padding:16px 20px;text-align:left;font-weight:600}
.compare-table td{padding:16px 20px;border-bottom:1px solid var(--border)}
.compare-table tr:last-child td{border-bottom:none}
.compare-table .check{color:#2e7d32;font-weight:700}.compare-table .cross{color:#c62828}
.compare-table tr:hover td{background:var(--bg-light)}

/* FAQ */
.faq-list{max-width:860px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.faq-toggle{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;cursor:pointer;font-weight:600;font-size:16px;color:var(--text);background:none;border:none;width:100%;text-align:left}
.faq-toggle:hover{background:var(--bg-light)}
.faq-toggle::after{content:'+';font-size:22px;color:var(--primary);font-weight:400;transition:transform .2s}
.faq-item.active .faq-toggle::after{content:'−'}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 24px}
.faq-item.active .faq-answer{max-height:500px;padding:0 24px 20px}
.faq-answer p{font-size:15px;color:var(--text-light);line-height:1.7}

/* Download page */
.download-hero{background:linear-gradient(135deg,#0d1b2a,#1565c0);padding:80px 24px 60px;color:#fff}
.download-hero-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:center}
.download-hero h1{font-size:44px;font-weight:800;margin-bottom:16px}
.download-hero p{font-size:18px;color:rgba(255,255,255,0.85);margin-bottom:32px}
.download-meta{display:flex;gap:24px;margin-bottom:32px;flex-wrap:wrap}
.download-meta span{display:flex;align-items:center;gap:8px;font-size:14px;color:rgba(255,255,255,0.8)}
.download-card{background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.12);border-radius:var(--radius-lg);padding:36px;text-align:center;backdrop-filter:blur(10px)}
.download-card .platform-icon{background:rgba(255,255,255,0.1);margin-bottom:20px}
.download-card h3{font-size:22px;margin-bottom:8px}
.download-card p{font-size:14px;color:rgba(255,255,255,0.7);margin-bottom:20px}

/* Install guide */
.steps{display:flex;flex-direction:column;gap:24px;margin-top:36px}
.step{display:grid;grid-template-columns:48px 1fr;gap:20px;align-items:start}
.step-num{width:48px;height:48px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px;flex-shrink:0}
.step-content h4{font-size:18px;font-weight:600;margin-bottom:8px}
.step-content p{font-size:15px;color:var(--text-light);line-height:1.7}

/* Version history */
.version-list{display:flex;flex-direction:column;gap:20px;margin-top:32px}
.version-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;display:grid;grid-template-columns:140px 1fr;gap:24px}
.version-item strong{color:var(--primary);font-size:16px}
.version-item ul{list-style:none;display:flex;flex-direction:column;gap:6px}
.version-item li{font-size:15px;color:var(--text-light);padding-left:16px;position:relative}
.version-item li::before{content:'•';color:var(--primary);position:absolute;left:0}

/* System requirements */
.sys-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;margin-top:32px}
.sys-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px}
.sys-card h4{font-size:18px;font-weight:600;margin-bottom:16px;display:flex;align-items:center;gap:10px}
.sys-card h4 svg{color:var(--primary)}
.sys-card ul{list-style:none;display:flex;flex-direction:column;gap:8px}
.sys-card li{font-size:14px;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}

/* zh-cn page */
.content-article{max-width:860px;margin:0 auto;font-size:17px;line-height:1.9;color:var(--text)}
.content-article h2{font-size:32px;font-weight:700;margin:48px 0 20px;color:var(--text)}
.content-article h3{font-size:24px;font-weight:600;margin:36px 0 16px}
.content-article p{margin-bottom:20px;color:var(--text-light)}
.content-article ul,.content-article ol{margin:0 0 20px 24px;color:var(--text-light)}
.content-article li{margin-bottom:10px}
.keyword-box{background:linear-gradient(135deg,rgba(21,101,192,0.06),rgba(66,165,245,0.06));border-left:4px solid var(--primary);padding:24px 28px;border-radius:0 var(--radius) var(--radius) 0;margin:28px 0}
.tips-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin:32px 0}
.tip-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px}
.tip-card h4{font-size:17px;font-weight:600;margin-bottom:10px;color:var(--primary)}
.tip-card p{font-size:15px;color:var(--text-light);line-height:1.7}

/* CTA section */
.cta-section{background:linear-gradient(135deg,var(--primary-dark),var(--primary));padding:80px 24px;text-align:center;color:#fff}
.cta-section h2{font-size:36px;font-weight:700;margin-bottom:16px}
.cta-section p{font-size:18px;color:rgba(255,255,255,0.85);margin-bottom:32px;max-width:600px;margin-left:auto;margin-right:auto}

/* Footer */
.site-footer{background:var(--bg-dark);color:rgba(255,255,255,0.6);padding:40px 24px;text-align:center;font-size:14px}
.site-footer p{line-height:1.8}
.site-footer strong{color:rgba(255,255,255,0.9)}

/* Responsive */
@media(max-width:900px){
  .hero-inner,.download-hero-inner,.deep-feature{grid-template-columns:1fr}
  .hero h1{font-size:36px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .hero-visual{display:none}
}
@media(max-width:600px){
  .nav-links a{padding:8px 12px;font-size:13px}
  .hero h1{font-size:28px}
  .section-header h2{font-size:28px}
  .features-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr}
  .step{grid-template-columns:36px 1fr}
  .step-num{width:36px;height:36px;font-size:15px}
}