/* ============================================
   梯子游戏AI数据分析中心 - 主样式表
   AI Data Lab Style
   ============================================ */

/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
    --bg-primary:#07070d;
    --bg-secondary:#0d0d18;
    --bg-card:rgba(255,255,255,0.025);
    --bg-card-hover:rgba(255,255,255,0.045);
    --border-color:rgba(255,255,255,0.06);
    --border-glow:rgba(0,245,212,0.3);
    --text-primary:#e8e8f0;
    --text-secondary:#8888a0;
    --text-muted:#555568;
    --accent-blue:#1a6fff;
    --accent-cyan:#00f5d4;
    --accent-purple:#764ba2;
    --gradient-main:linear-gradient(135deg,#667eea 0%,#764ba2 100%);
    --gradient-blue:linear-gradient(135deg,#1a6fff 0%,#00d4ff 100%);
    --gradient-purple:linear-gradient(135deg,#764ba2 0%,#667eea 100%);
    --gradient-dark:linear-gradient(180deg,#0d0d18 0%,#07070d 100%);
    --shadow-glow:0 0 30px rgba(0,245,212,0.1);
    --shadow-card:0 4px 24px rgba(0,0,0,0.4);
    --radius:12px;
    --radius-sm:8px;
    --transition:all .3s cubic-bezier(.4,0,.2,1);
    --max-width:1280px;
}
html{font-size:16px;scroll-behavior:smooth}
body{
    font-family:'Inter','-apple-system','Segoe UI','Microsoft YaHei',sans-serif;
    background:var(--bg-primary);
    color:var(--text-primary);
    line-height:1.7;
    overflow-x:hidden;
    min-height:100vh;
}
/* 网格背景 */
body::before{
    content:'';
    position:fixed;
    top:0;left:0;right:0;bottom:0;
    background-image:
        linear-gradient(rgba(26,111,255,0.03) 1px,transparent 1px),
        linear-gradient(90deg,rgba(26,111,255,0.03) 1px,transparent 1px);
    background-size:50px 50px;
    pointer-events:none;
    z-index:0;
}
/* 光晕背景 */
body::after{
    content:'';
    position:fixed;
    top:-200px;right:-200px;
    width:600px;height:600px;
    background:radial-gradient(circle,rgba(118,75,162,0.08) 0%,transparent 70%);
    pointer-events:none;
    z-index:0;
}
a{color:var(--accent-cyan);text-decoration:none;transition:var(--transition)}
a:hover{color:#fff;text-shadow:0 0 12px var(--accent-cyan)}
img{max-width:100%;height:auto}
ul,ol{list-style:none}

/* Container */
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px;position:relative;z-index:1}

/* Header */
.header{
    position:fixed;top:0;left:0;right:0;z-index:100;
    background:rgba(7,7,13,0.85);
    backdrop-filter:blur(20px);
    -webkit-backdrop-filter:blur(20px);
    border-bottom:1px solid var(--border-color);
    transition:var(--transition);
}
.header.scrolled{background:rgba(7,7,13,0.95);box-shadow:0 2px 20px rgba(0,0,0,0.5)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;max-width:var(--max-width);margin:0 auto;padding:0 24px}
.logo{display:flex;align-items:center;gap:10px;font-size:1.1rem;font-weight:700;color:#fff;white-space:nowrap}
.logo-icon{
    width:36px;height:36px;
    background:var(--gradient-main);
    border-radius:8px;
    display:flex;align-items:center;justify-content:center;
    font-size:1.2rem;
    box-shadow:0 0 20px rgba(102,126,234,0.3);
}
.logo-text{background:var(--gradient-main);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.nav{display:flex;gap:8px;align-items:center}
.nav a{
    padding:8px 16px;border-radius:var(--radius-sm);
    color:var(--text-secondary);font-size:.9rem;font-weight:500;
    transition:var(--transition);
}
.nav a:hover,.nav a.active{color:var(--accent-cyan);background:rgba(0,245,212,0.08)}
.menu-toggle{display:none;background:none;border:none;color:var(--text-primary);font-size:1.5rem;cursor:pointer}

/* Hero Section */
.hero{
    min-height:100vh;display:flex;align-items:center;justify-content:center;
    text-align:center;padding:80px 24px 40px;position:relative;
}
.hero-bg{
    position:absolute;top:0;left:0;right:0;bottom:0;overflow:hidden;z-index:0;
}
.hero-particle{
    position:absolute;border-radius:50%;
    background:var(--accent-cyan);opacity:0.15;
    animation:float 20s infinite ease-in-out;
}
@keyframes float{
    0%,100%{transform:translateY(0) translateX(0)}
    33%{transform:translateY(-30px) translateX(20px)}
    66%{transform:translateY(20px) translateX(-15px)}
}
.hero-content{position:relative;z-index:2;max-width:800px}
.hero-badge{
    display:inline-flex;align-items:center;gap:8px;
    padding:6px 16px;border-radius:20px;
    background:rgba(0,245,212,0.08);border:1px solid rgba(0,245,212,0.2);
    color:var(--accent-cyan);font-size:.8rem;margin-bottom:24px;
}
.hero-badge .dot{width:6px;height:6px;background:var(--accent-cyan);border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{
    font-size:3rem;font-weight:800;line-height:1.3;margin-bottom:20px;
    background:linear-gradient(135deg,#fff 0%,#667eea 50%,#00f5d4 100%);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero p{font-size:1.15rem;color:var(--text-secondary);margin-bottom:40px;max-width:600px;margin-left:auto;margin-right:auto}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* Buttons */
.btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:12px 28px;border-radius:var(--radius-sm);
    font-size:.95rem;font-weight:600;cursor:pointer;
    transition:var(--transition);border:none;outline:none;
}
.btn-primary{
    background:var(--gradient-main);color:#fff;
    box-shadow:0 4px 20px rgba(102,126,234,0.3);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(102,126,234,0.5);color:#fff}
.btn-outline{
    background:transparent;color:var(--text-primary);
    border:1px solid var(--border-color);
}
.btn-outline:hover{border-color:var(--accent-cyan);color:var(--accent-cyan);box-shadow:var(--shadow-glow)}

/* Stats Grid */
.stats-grid{
    display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
    margin:60px 0;
}
.stat-card{
    background:var(--bg-card);border:1px solid var(--border-color);
    border-radius:var(--radius);padding:28px 24px;
    transition:var(--transition);position:relative;overflow:hidden;
}
.stat-card::before{
    content:'';position:absolute;top:0;left:0;right:0;height:2px;
    background:var(--gradient-blue);opacity:0;transition:var(--transition);
}
.stat-card:hover{background:var(--bg-card-hover);border-color:rgba(0,245,212,0.15);transform:translateY(-4px)}
.stat-card:hover::before{opacity:1}
.stat-icon{
    width:44px;height:44px;border-radius:10px;
    display:flex;align-items:center;justify-content:center;
    font-size:1.3rem;margin-bottom:16px;
    background:rgba(26,111,255,0.1);
}
.stat-value{font-size:2.2rem;font-weight:800;color:#fff;margin-bottom:4px}
.stat-label{font-size:.85rem;color:var(--text-secondary)}
.stat-trend{font-size:.8rem;color:var(--accent-cyan);margin-top:8px}

/* Section */
.section{padding:60px 0}
.section-title{font-size:1.8rem;font-weight:700;margin-bottom:8px;color:#fff}
.section-desc{color:var(--text-secondary);margin-bottom:32px;font-size:.95rem}
.section-header{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:32px;flex-wrap:wrap;gap:16px}

/* Dashboard Cards */
.dash-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:60px}
.dash-card{
    background:var(--bg-card);border:1px solid var(--border-color);
    border-radius:var(--radius);padding:28px;
    transition:var(--transition);position:relative;overflow:hidden;
}
.dash-card:hover{border-color:rgba(0,245,212,0.2);transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,0.3)}
.dash-card .icon{
    width:48px;height:48px;border-radius:12px;margin-bottom:20px;
    display:flex;align-items:center;justify-content:center;font-size:1.4rem;
}
.dash-card .icon.blue{background:rgba(26,111,255,0.12);color:var(--accent-blue)}
.dash-card .icon.cyan{background:rgba(0,245,212,0.12);color:var(--accent-cyan)}
.dash-card .icon.purple{background:rgba(118,75,162,0.12);color:var(--accent-purple)}
.dash-card .icon.gradient{background:var(--gradient-main);color:#fff}
.dash-card h3{font-size:1.1rem;font-weight:600;margin-bottom:8px;color:#fff}
.dash-card p{font-size:.85rem;color:var(--text-secondary);margin-bottom:16px;line-height:1.6}
.dash-card .link{font-size:.85rem;color:var(--accent-cyan);font-weight:600;display:inline-flex;align-items:center;gap:4px}
.dash-card .link:hover{gap:8px}

/* Chart Container */
.chart-container{
    background:var(--bg-card);border:1px solid var(--border-color);
    border-radius:var(--radius);padding:28px;margin-bottom:40px;
}
.chart-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;flex-wrap:wrap;gap:12px}
.chart-title{font-size:1.1rem;font-weight:600;color:#fff}
.chart-tabs{display:flex;gap:4px;background:rgba(0,0,0,0.3);border-radius:8px;padding:4px}
.chart-tab{padding:6px 14px;border-radius:6px;font-size:.8rem;color:var(--text-secondary);cursor:pointer;transition:var(--transition)}
.chart-tab.active{background:var(--gradient-main);color:#fff}
#trendChart{width:100%;height:320px}

/* Keywords Cloud */
.keyword-cloud{display:flex;flex-wrap:wrap;gap:12px}
.keyword-tag{
    padding:10px 20px;border-radius:24px;
    background:var(--bg-card);border:1px solid var(--border-color);
    color:var(--text-secondary);font-size:.9rem;font-weight:500;
    transition:var(--transition);cursor:pointer;
}
.keyword-tag:hover{
    background:rgba(0,245,212,0.08);border-color:rgba(0,245,212,0.2);
    color:var(--accent-cyan);transform:translateY(-2px);
    box-shadow:0 4px 16px rgba(0,245,212,0.1);
}

/* Article Cards */
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.article-card{
    background:var(--bg-card);border:1px solid var(--border-color);
    border-radius:var(--radius);overflow:hidden;transition:var(--transition);
    display:flex;flex-direction:column;
}
.article-card:hover{border-color:rgba(0,245,212,0.15);transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,0.3)}
.article-card-thumb{
    height:180px;background:var(--gradient-dark);
    display:flex;align-items:center;justify-content:center;
    font-size:2.5rem;color:var(--text-muted);position:relative;
}
.article-card-thumb::after{
    content:'';position:absolute;bottom:0;left:0;right:0;height:60%;
    background:linear-gradient(180deg,transparent,rgba(7,7,13,0.8));
}
.article-card-body{padding:24px;flex:1;display:flex;flex-direction:column}
.article-card-cat{
    display:inline-block;font-size:.75rem;color:var(--accent-cyan);
    margin-bottom:8px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;
}
.article-card h3{font-size:1.05rem;font-weight:600;color:#fff;margin-bottom:8px;line-height:1.5;flex:1}
.article-card h3:hover{color:var(--accent-cyan)}
.article-card p{font-size:.85rem;color:var(--text-secondary);margin-bottom:16px;line-height:1.6}
.article-card-meta{display:flex;justify-content:space-between;align-items:center;font-size:.8rem;color:var(--text-muted);margin-top:auto}

/* Data Table */
.data-table{
    width:100%;border-collapse:collapse;
    background:var(--bg-card);border-radius:var(--radius);overflow:hidden;
    border:1px solid var(--border-color);
}
.data-table th{
    background:rgba(0,245,212,0.06);color:var(--accent-cyan);
    padding:14px 16px;text-align:left;font-size:.8rem;font-weight:600;
    text-transform:uppercase;letter-spacing:.5px;
    border-bottom:1px solid rgba(0,245,212,0.1);
}
.data-table td{padding:12px 16px;border-bottom:1px solid var(--border-color);font-size:.9rem;color:var(--text-primary)}
.data-table tr:last-child td{border-bottom:none}
.data-table tr:hover td{background:rgba(0,245,212,0.02)}
.badge{display:inline-block;padding:3px 10px;border-radius:6px;font-size:.75rem;font-weight:600}
.badge-single{background:rgba(26,111,255,0.15);color:var(--accent-blue)}
.badge-double{background:rgba(118,75,162,0.15);color:#a78bfa}

/* Footer */
.footer{
    background:var(--bg-secondary);border-top:1px solid var(--border-color);
    padding:48px 0 24px;margin-top:80px;
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:32px}
.footer-brand h4{font-size:1.1rem;font-weight:700;color:#fff;margin-bottom:12px}
.footer-brand p{font-size:.85rem;color:var(--text-secondary);line-height:1.7}
.footer-col h5{font-size:.9rem;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col a{display:block;font-size:.85rem;color:var(--text-secondary);margin-bottom:10px;transition:var(--transition)}
.footer-col a:hover{color:var(--accent-cyan)}
.footer-bottom{padding-top:24px;border-top:1px solid var(--border-color);text-align:center;font-size:.85rem;color:var(--text-muted)}

/* Back to top */
.back-top{
    position:fixed;bottom:30px;right:30px;
    width:44px;height:44px;border-radius:50%;
    background:var(--gradient-main);color:#fff;
    display:flex;align-items:center;justify-content:center;
    cursor:pointer;border:none;outline:none;
    opacity:0;visibility:hidden;transition:var(--transition);z-index:99;
    box-shadow:0 4px 20px rgba(102,126,234,0.3);
}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(102,126,234,0.5)}

/* Animations */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.fade-in-up{animation:fadeInUp .6s ease-out forwards}
.delay-1{animation-delay:.1s;opacity:0}
.delay-2{animation-delay:.2s;opacity:0}
.delay-3{animation-delay:.3s;opacity:0}
.delay-4{animation-delay:.4s;opacity:0}

/* Article Page */
.article-page{padding:80px 24px 40px}
.article-breadcrumb{display:flex;gap:8px;align-items:center;font-size:.85rem;color:var(--text-muted);margin-bottom:24px}
.article-breadcrumb a{color:var(--text-secondary)}
.article-breadcrumb a:hover{color:var(--accent-cyan)}
.article-breadcrumb .sep{color:var(--text-muted)}
.article-header{margin-bottom:40px;padding-bottom:24px;border-bottom:1px solid var(--border-color)}
.article-header h1{font-size:2rem;font-weight:700;color:#fff;line-height:1.4;margin-bottom:16px}
.article-meta{display:flex;gap:20px;font-size:.85rem;color:var(--text-secondary);flex-wrap:wrap}
.article-meta span{display:flex;align-items:center;gap:6px}
.article-summary{
    background:rgba(0,245,212,0.04);border-left:3px solid var(--accent-cyan);
    padding:20px 24px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom:40px;font-size:.95rem;color:var(--text-secondary);line-height:1.8;
}
.article-body{font-size:1rem;line-height:1.9;color:var(--text-primary)}
.article-body h2{font-size:1.4rem;font-weight:700;color:#fff;margin:36px 0 16px;padding-left:16px;border-left:3px solid var(--accent-blue)}
.article-body h3{font-size:1.15rem;font-weight:600;color:#fff;margin:24px 0 12px}
.article-body p{margin-bottom:20px;color:var(--text-secondary)}
.article-body ul,.article-body ol{margin:16px 0 20px 20px}
.article-body ul li,.article-body ol li{margin-bottom:8px;color:var(--text-secondary)}
.article-body ul li{list-style:disc}
.article-body ol li{list-style:decimal}
.article-body strong{color:#fff;font-weight:600}
.article-body blockquote{
    background:var(--bg-card);border:1px solid var(--border-color);
    border-radius:var(--radius-sm);padding:16px 20px;margin:20px 0;
    color:var(--text-secondary);font-style:italic;
}
.article-body code{
    background:rgba(0,245,212,0.08);color:var(--accent-cyan);
    padding:2px 8px;border-radius:4px;font-size:.9rem;
}

/* FAQ */
.faq-section{margin:40px 0;padding:32px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius)}
.faq-section h2{font-size:1.4rem;font-weight:700;color:#fff;margin-bottom:24px}
.faq-item{border-bottom:1px solid var(--border-color);padding:16px 0}
.faq-item:last-child{border-bottom:none}
.faq-item h3{font-size:1.05rem;font-weight:600;color:var(--text-primary);margin-bottom:8px;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-item h3::after{content:'+';color:var(--accent-cyan);font-size:1.2rem;transition:var(--transition)}
.faq-item.open h3::after{transform:rotate(45deg)}
.faq-item p{color:var(--text-secondary);font-size:.9rem;line-height:1.7;display:none}
.faq-item.open p{display:block}

/* Related Articles */
.related-section{margin:48px 0}
.related-section h2{font-size:1.4rem;font-weight:700;color:#fff;margin-bottom:24px}
.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.related-card{
    display:flex;gap:16px;padding:20px;
    background:var(--bg-card);border:1px solid var(--border-color);
    border-radius:var(--radius-sm);transition:var(--transition);
}
.related-card:hover{border-color:rgba(0,245,212,0.15);background:var(--bg-card-hover)}
.related-card .num{font-size:1.5rem;font-weight:800;color:rgba(0,245,212,0.2);min-width:32px}
.related-card h4{font-size:.95rem;font-weight:600;color:#fff;margin-bottom:4px;line-height:1.4}
.related-card h4:hover{color:var(--accent-cyan)}
.related-card p{font-size:.8rem;color:var(--text-muted)}

/* Topic Page */
.topic-page{padding:80px 24px 40px}
.topic-header{text-align:center;margin-bottom:40px}
.topic-header h1{font-size:2rem;font-weight:700;color:#fff;margin-bottom:12px}
.topic-header p{color:var(--text-secondary);max-width:600px;margin:0 auto}
.topic-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:40px}
.topic-stat{text-align:center;padding:24px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius)}
.topic-stat .val{font-size:1.8rem;font-weight:800;color:var(--accent-cyan)}
.topic-stat .lbl{font-size:.8rem;color:var(--text-secondary);margin-top:4px}

/* Pagination */
.pagination{display:flex;gap:8px;justify-content:center;margin-top:32px}
.pagination a,.pagination span{
    padding:8px 14px;border-radius:var(--radius-sm);font-size:.85rem;
    background:var(--bg-card);border:1px solid var(--border-color);color:var(--text-secondary);
}
.pagination a:hover{border-color:var(--accent-cyan);color:var(--accent-cyan)}
.pagination .current{background:var(--gradient-main);color:#fff;border-color:transparent}

/* Filter buttons */
.filter-bar{display:flex;gap:8px;margin-bottom:24px;flex-wrap:wrap}
.filter-btn{padding:8px 18px;border-radius:20px;font-size:.85rem;background:var(--bg-card);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;transition:var(--transition)}
.filter-btn.active,.filter-btn:hover{background:rgba(0,245,212,0.08);border-color:rgba(0,245,212,0.2);color:var(--accent-cyan)}

/* Responsive */
@media(max-width:1024px){
    .stats-grid{grid-template-columns:repeat(2,1fr)}
    .dash-grid{grid-template-columns:repeat(2,1fr)}
    .article-grid{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
    .topic-stats{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
    .nav{display:none;position:fixed;top:64px;left:0;right:0;background:rgba(7,7,13,0.98);flex-direction:column;padding:16px;gap:4px;border-bottom:1px solid var(--border-color)}
    .nav.open{display:flex}
    .nav a{padding:12px 16px;width:100%}
    .menu-toggle{display:block}
    .hero h1{font-size:2rem}
    .hero p{font-size:1rem}
    .stats-grid{grid-template-columns:1fr}
    .dash-grid{grid-template-columns:1fr}
    .article-grid{grid-template-columns:1fr}
    .related-grid{grid-template-columns:1fr}
    .footer-grid{grid-template-columns:1fr;gap:24px}
    .topic-stats{grid-template-columns:repeat(2,1fr)}
    .article-header h1{font-size:1.5rem}
    .section-title{font-size:1.4rem}
    .container{padding:0 16px}
    .hero{padding:70px 16px 30px}
}
@media(max-width:480px){
    .hero h1{font-size:1.6rem}
    .stat-value{font-size:1.8rem}
    .article-card-thumb{height:140px}
}