/* 优科网 · SevenLabs — 七维渐变暗色主题 */
:root {
    --primary: #0c0a1a;
    --primary-light: #1a1535;
    --bg: #0c0a1a;
    --bg-alt: #141028;
    --bg-card: #1a1535;
    --text: #e8e6f0;
    --text-dim: #8b87a0;
    --border: #2a2545;
    --radius: 12px;
    --dim1: #8b5cf6; --dim2: #3b82f6; --dim3: #10b981; --dim4: #f59e0b; --dim5: #ef4444; --dim6: #06b6d4; --dim7: #6366f1;
    --gradient7: linear-gradient(135deg, #8b5cf6, #3b82f6, #10b981, #f59e0b, #ef4444, #06b6d4, #6366f1);
}
*{margin:0;padding:0;box-sizing:border-box;}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Noto Sans SC',sans-serif;background:var(--bg);color:var(--text);line-height:1.6;}
a{color:inherit;text-decoration:none;}
a:hover{text-decoration:underline;}
.container{max-width:1200px;margin:0 auto;padding:0 20px;}

/* Navbar */
.navbar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:rgba(12,10,26,.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;}
.nav-brand a{font-size:1.5rem;font-weight:800;background:var(--gradient7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:1px;}
.nav-subtitle{font-size:.75rem;color:var(--text-dim);margin-left:8px;}
.nav-links{display:flex;gap:16px;align-items:center;flex-wrap:wrap;}
.nav-links a{color:var(--text-dim);font-size:.9rem;padding:6px 12px;border-radius:8px;transition:.2s;}
.nav-links a:hover,.nav-links a.active{color:#fff;background:rgba(139,92,246,.15);text-decoration:none;}
.btn-nav{background:var(--gradient7)!important;color:#fff!important;font-weight:600;padding:6px 18px!important;border-radius:8px!important;font-size:.85rem!important;}
.btn-nav:hover{opacity:.9;}

/* Hero */
.hero{position:relative;padding:80px 20px 60px;text-align:center;overflow:hidden;}
.hero-bg{position:absolute;inset:0;background:radial-gradient(ellipse at 50% 0%,rgba(139,92,246,.15) 0%,transparent 60%),radial-gradient(ellipse at 20% 50%,rgba(59,130,246,.1) 0%,transparent 50%),radial-gradient(ellipse at 80% 50%,rgba(16,185,129,.1) 0%,transparent 50%);}
.hero-content{position:relative;z-index:1;}
.hero-badge{display:inline-block;font-size:.8rem;color:var(--text-dim);border:1px solid var(--border);border-radius:20px;padding:4px 16px;margin-bottom:20px;}
.hero h1{font-size:2.8rem;font-weight:800;margin-bottom:12px;}
.gradient-text{background:var(--gradient7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
.hero-en{font-size:1rem;color:var(--text-dim);margin-bottom:32px;font-style:italic;}
.hero-dims{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-bottom:40px;}
.dim-pill{display:flex;align-items:center;gap:4px;padding:8px 16px;border-radius:20px;background:var(--bg-card);border:1px solid var(--border);color:var(--text-dim);font-size:.85rem;transition:.2s;text-decoration:none;}
.dim-pill:hover{border-color:var(--dim-color);color:var(--dim-color);transform:translateY(-2px);text-decoration:none;box-shadow:0 4px 16px rgba(0,0,0,.3);}
.dim-icon{font-size:1rem;}
.hero-stats{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;}
.stat-item{display:flex;flex-direction:column;align-items:center;gap:2px;}
.stat-num{font-size:1.8rem;font-weight:800;background:var(--gradient7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
.stat-label{font-size:.75rem;color:var(--text-dim);}

/* Section */
.section{padding:48px 0;}
.section-alt{background:var(--bg-alt);}
.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;}
.section-header h2{font-size:1.5rem;}
.section-desc{color:var(--text-dim);margin-bottom:24px;}
.more-link{color:#8b5cf6;font-size:.9rem;}

/* News */
.news-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;}
.news-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;border-left:3px solid var(--dim-color);transition:.2s;}
.news-card:hover{border-color:var(--dim-color);transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.3);}
.news-dim{display:flex;align-items:center;gap:4px;font-size:.75rem;color:var(--dim-color);font-weight:600;margin-bottom:8px;}
.dim-icon-sm{font-size:.9rem;}
.news-card h3{font-size:1rem;margin-bottom:8px;line-height:1.4;}
.news-card p{font-size:.85rem;color:var(--text-dim);}
.news-meta{display:flex;justify-content:space-between;font-size:.75rem;color:var(--text-dim);margin-top:8px;flex-wrap:wrap;gap:4px;}
.audio-tag{background:rgba(139,92,246,.15);color:#8b5cf6;padding:1px 8px;border-radius:8px;}
.news-list{display:flex;flex-direction:column;gap:16px;}
.news-full-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;border-left:4px solid var(--dim-color);}
.news-full-card h3{font-size:1.1rem;margin:8px 0;}
.news-full-card p{color:var(--text-dim);font-size:.9rem;}
.news-dim-tag{font-size:.75rem;color:var(--dim-color);font-weight:600;}

/* Filter */
.filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px;}
.filter-btn{background:var(--bg-card);border:1px solid var(--border);color:var(--text-dim);padding:6px 16px;border-radius:20px;font-size:.85rem;transition:.2s;text-decoration:none;}
.filter-btn:hover,.filter-btn.active{background:rgba(139,92,246,.15);color:#8b5cf6;border-color:#8b5cf6;text-decoration:none;}

/* Voice */
.voice-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;}
.voice-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;text-align:center;transition:.2s;}
.voice-card:hover{border-color:#8b5cf6;transform:translateY(-2px);}
.voice-card.featured:hover{box-shadow:0 0 24px rgba(139,92,246,.2);}
.voice-avatar{width:56px;height:56px;border-radius:50%;background:var(--gradient7);display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:800;color:#fff;margin:0 auto 12px;}
.voice-icon{font-size:2rem;margin-bottom:8px;}
.voice-card h3{font-size:1rem;margin-bottom:4px;}
.voice-category{font-size:.75rem;color:#8b5cf6;font-weight:600;}
.voice-card p{font-size:.8rem;color:var(--text-dim);margin:8px 0;}
.voice-style{font-size:.7rem;color:var(--text-dim);font-style:italic;}
.voice-persona{font-size:.75rem;color:var(--text-dim);margin-top:8px;border-top:1px solid var(--border);padding-top:8px;}

/* Podcast */
.podcast-grid,.podcast-list{display:flex;flex-direction:column;gap:12px;}
.podcast-card{display:flex;align-items:center;gap:16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;border-left:3px solid var(--dim-color);transition:.2s;}
.podcast-card:hover{border-color:var(--dim-color);background:rgba(26,21,53,.8);}
.podcast-play{width:48px;height:48px;border-radius:50%;background:var(--gradient7);display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:#fff;flex-shrink:0;cursor:pointer;transition:.2s;}
.podcast-play:hover{transform:scale(1.1);}
.podcast-info{flex:1;}
.podcast-info h3{font-size:1rem;margin-bottom:4px;}
.podcast-info p{font-size:.85rem;color:var(--text-dim);}
.podcast-meta{display:flex;gap:12px;font-size:.75rem;color:var(--text-dim);margin-top:4px;}

/* Tools */
.tools-grid,.tools-full-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;}
.tool-card{display:block;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:.2s;text-decoration:none;}
.tool-card:hover{border-color:var(--dim-color);transform:translateY(-2px);text-decoration:none;box-shadow:0 8px 24px rgba(0,0,0,.3);}
.tool-icon{font-size:2rem;margin-bottom:8px;}
.tool-card h3{font-size:1rem;color:var(--text);margin-bottom:6px;}
.tool-card p{font-size:.85rem;color:var(--text-dim);}
.tool-footer{display:flex;justify-content:space-between;margin-top:12px;}
.tool-dim{font-size:.75rem;color:var(--dim-color);font-weight:600;}
.tool-cat{font-size:.7rem;color:var(--text-dim);background:rgba(139,92,246,.1);padding:2px 8px;border-radius:10px;}

/* Courses */
.course-grid,.course-full-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;}
.course-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:.2s;}
.course-card:hover{border-color:#8b5cf6;transform:translateY(-2px);}
.course-voice{font-size:.75rem;color:#8b5cf6;font-weight:600;margin-bottom:8px;}
.course-card h3{font-size:1.05rem;margin-bottom:8px;line-height:1.4;}
.course-card p{font-size:.85rem;color:var(--text-dim);}
.course-meta{display:flex;gap:12px;font-size:.75rem;color:var(--text-dim);margin-top:12px;flex-wrap:wrap;}

/* Community */
.community-list{display:flex;flex-direction:column;gap:16px;}
.post-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;}
.post-type{font-size:.7rem;color:#8b5cf6;font-weight:600;}
.post-card h3{font-size:1.05rem;margin:8px 0;}
.post-card p{font-size:.85rem;color:var(--text-dim);}
.post-meta{display:flex;justify-content:space-between;font-size:.75rem;color:var(--text-dim);margin-top:8px;}
.empty-state{text-align:center;padding:48px;color:var(--text-dim);}

/* Auth */
.auth-container{display:flex;justify-content:center;}
.auth-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;width:100%;max-width:420px;}
.auth-card h1{text-align:center;margin-bottom:24px;}
.form-group{margin-bottom:16px;}
.form-group label{display:block;font-size:.85rem;color:var(--text-dim);margin-bottom:4px;}
.form-group input{width:100%;padding:10px 12px;background:var(--bg);border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:.95rem;}
.form-group input:focus{outline:none;border-color:#8b5cf6;}
.btn-primary{width:100%;padding:12px;background:var(--gradient7);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;}
.btn-primary:hover{opacity:.9;}
.auth-switch{text-align:center;margin-top:16px;font-size:.85rem;color:var(--text-dim);}
.error-msg{background:rgba(239,68,68,.1);color:#ef4444;padding:8px 12px;border-radius:8px;margin-bottom:16px;font-size:.85rem;}

/* Admin */
.admin-stats{display:flex;gap:24px;flex-wrap:wrap;margin:24px 0;}
.admin-section{margin-top:32px;}
.admin-actions{display:flex;gap:12px;flex-wrap:wrap;}
.admin-btn{display:inline-block;background:var(--bg-card);border:1px solid var(--border);color:var(--text);padding:12px 24px;border-radius:var(--radius);font-weight:600;transition:.2s;}
.admin-btn:hover{border-color:#8b5cf6;color:#8b5cf6;text-decoration:none;}

/* Footer */
.footer{background:var(--primary);border-top:1px solid var(--border);padding:40px 0 24px;margin-top:48px;}
.footer-top{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px;margin-bottom:24px;}
.footer-brand h3{background:var(--gradient7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;font-size:1.2rem;margin-bottom:8px;}
.footer-brand p{font-size:.85rem;color:var(--text-dim);}
.footer-en{font-style:italic;font-size:.8rem!important;}
.footer-dims{display:flex;flex-direction:column;gap:6px;}
.footer-dims a{font-size:.85rem;transition:.2s;}
.footer-dims a:hover{text-decoration:none;transform:translateX(4px);}
.footer-links{display:flex;flex-direction:column;gap:6px;}
.footer-links a{font-size:.85rem;color:var(--text-dim);}
.footer-links a:hover{color:#8b5cf6;}
.copyright{text-align:center;font-size:.75rem;color:var(--text-dim);border-top:1px solid var(--border);padding-top:16px;}

@media(max-width:768px){
    .hero h1{font-size:1.8rem;}
    .hero-dims{gap:6px;}
    .dim-pill{padding:6px 10px;font-size:.75rem;}
    .navbar{flex-direction:column;gap:8px;}
    .nav-links{justify-content:center;}
    .news-grid,.voice-grid,.tools-grid,.tools-full-grid,.course-grid,.course-full-grid{grid-template-columns:1fr;}
    .stat-num{font-size:1.3rem;}
}