:root{--bg-primary: #0a0e1a;--bg-secondary: #0f172a;--bg-card: rgba(15, 23, 42, .95);--bg-card-hover: rgba(30, 41, 59, .95);--bg-hover: #334155;--bg-input: #0a0e1a;--border: #334155;--border-light: rgba(255, 255, 255, .1);--text-primary: #ffffff;--text-secondary: #cbd5e1;--text-muted: #94a3b8;--accent: #0ea5e9;--accent-hover: #0284c7;--accent-light: #38bdf8;--secondary: #06b6d4;--success: #10b981;--success-bg: rgba(16, 185, 129, .1);--warning: #f59e0b;--danger: #ef4444;--danger-bg: rgba(239, 68, 68, .1);--glass-bg: linear-gradient(135deg, rgba(15, 23, 42, .95), rgba(30, 41, 59, .95));--glass-border: rgba(255, 255, 255, .1);--shadow-glow-cyan: 0 0 20px rgba(14, 165, 233, .4);--shadow-glow-sm: 0 0 10px rgba(14, 165, 233, .2);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 18px;--radius-full: 9999px;--sidebar-width: 260px;--topbar-height: 56px;--font: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-display: "Orbitron", var(--font);--transition: .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;scroll-behavior:smooth;background-color:#0a0e1a}body{font-family:var(--font);background:#0a0e1a;background-image:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);background-attachment:fixed;color:var(--text-primary);line-height:1.6;position:relative}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 20% 50%,rgba(14,165,233,.08) 0%,transparent 50%),radial-gradient(circle at 80% 80%,rgba(6,182,212,.06) 0%,transparent 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24px;position:sticky;top:0;z-index:50}.mobile-menu-btn{display:none;background:none;border:none;color:var(--text-secondary);cursor:pointer}.top-bar-right{display:flex;align-items:center;gap:12px;margin-left:auto}.notification-btn{position:relative;color:var(--text-secondary);display:flex;align-items:center;padding:8px;border-radius:var(--radius-sm)}.notification-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.notification-badge{position:absolute;top:2px;right:2px;background:var(--danger);color:#fff;font-size:10px;font-weight:700;width:18px;height:18px;border-radius:50%;display:flex;align-items:center;justify-content:center}.page-content{flex:1;padding:24px;max-width:1200px;width:100%;margin:0 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var(--glass-border);border-radius:var(--radius-xl);padding:40px 32px;position:relative;z-index:1;box-shadow:0 8px 40px #0006}.auth-header{text-align:center;margin-bottom:32px}.auth-logo{width:56px;height:56px;border-radius:var(--radius-lg);background:linear-gradient(135deg,var(--accent),var(--secondary));display:flex;align-items:center;justify-content:center;font-weight:800;font-size:24px;color:#fff;margin:0 auto 16px;box-shadow:var(--shadow-glow-cyan)}.auth-header h1{font-size:22px;font-weight:700;margin-bottom:4px}.auth-header p{color:var(--text-muted);font-size:14px}.auth-form{margin-bottom:20px}.auth-error{padding:10px 14px;background:var(--danger-bg);border:1px solid rgba(239,68,68,.3);border-radius:var(--radius-md);color:#fca5a5;font-size:13px;margin-bottom:16px}.auth-footer{text-align:center;font-size:14px;color:var(--text-muted)}.success-msg{display:flex;align-items:center;gap:8px;padding:10px 14px;background:var(--success-bg);border:1px solid 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.text-error{color:var(--danger)}.payment-status-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.course-card{background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);margin-bottom:20px;overflow:hidden}.course-header{padding:24px;border-bottom:1px solid var(--border)}.course-header h2{font-size:20px;margin-bottom:4px}.course-header p{color:var(--text-muted);font-size:14px}.course-progress{margin-top:12px}.course-progress span{display:block;font-size:12px;color:var(--text-muted);margin-top:6px}.module-item{border-bottom:1px solid var(--border)}.module-item:last-child{border-bottom:none}.module-header{display:flex;align-items:center;gap:10px;padding:14px 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a{color:var(--accent-light)}.lesson-content-wrapper{background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);padding:32px}.lesson-title{font-size:24px;margin-bottom:24px}.lesson-video{margin-bottom:24px;border-radius:var(--radius-md);overflow:hidden;aspect-ratio:16/9}.lesson-video iframe{width:100%;height:100%}.lesson-content{margin-bottom:32px}.lesson-actions{margin-bottom:24px}.lesson-nav{display:flex;justify-content:space-between;padding-top:20px;border-top:1px solid var(--border)}.lesson-nav-btn{display:flex;align-items:center;gap:6px;padding:8px 14px;background:var(--bg-hover);border-radius:var(--radius-md);color:var(--text-secondary);font-size:13px}.lesson-nav-btn:hover{color:var(--accent-light)}.forum-categories-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}.category-chip{padding:6px 14px;border-radius:20px;background:var(--bg-card);border:1px solid var(--border);color:var(--text-secondary);font-size:13px;font-weight:500;cursor:pointer;font-family:var(--font);transition:var(--transition)}.category-chip:hover{border-color:var(--accent);color:var(--accent-light)}.category-chip.active{background:#0ea5e926;border-color:var(--accent);color:var(--accent-light)}.chip-count{font-size:11px;color:var(--text-muted);margin-left:4px}.forum-toolbar{display:flex;gap:12px;margin-bottom:20px;flex-wrap:wrap}.forum-search{display:flex;align-items:center;gap:8px;flex:1;min-width:200px;padding:8px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-muted)}.forum-search input{flex:1;background:none;border:none;color:var(--text-primary);font-size:14px;font-family:var(--font);outline:none}.forum-sort{display:flex;gap:4px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:4px}.forum-sort button{padding:6px 14px;border:none;background:none;color:var(--text-muted);font-size:13px;font-family:var(--font);cursor:pointer;border-radius:var(--radius-sm);transition:var(--transition)}.forum-sort button.active{background:var(--bg-hover);color:var(--text-primary)}.forum-topics-list{display:flex;flex-direction:column;gap:8px}.topic-card{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 20px;background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-md);color:var(--text-primary);transition:var(--transition)}.topic-card:hover{border-color:var(--accent);color:var(--text-primary);box-shadow:var(--shadow-glow-sm)}.topic-main{flex:1;min-width:0}.topic-meta-top{display:flex;gap:8px;margin-bottom:4px;align-items:center;flex-wrap:wrap}.topic-badge{font-size:10px;font-weight:700;padding:2px 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