:root,[data-theme=professional]{--primary: #6366f1;--secondary: #94a3b8;--accent: #10b981;--warning: #f59e0b;--danger: #ef4444;--background: #2B3152;--card-bg: #353b5e;--text-main: #f8fafc;--text-muted: #94a3b8;--glass-border: rgba(255, 255, 255, .05);--body-bg: radial-gradient(circle at top right, #353b5e, #2B3152)}[data-theme=light]{--primary: #4f46e5;--secondary: #64748b;--accent: #059669;--warning: #d97706;--danger: #dc2626;--background: #f8fafc;--card-bg: #ffffff;--text-main: #0f172a;--text-muted: #64748b;--glass-border: rgba(0, 0, 0, .08);--body-bg: radial-gradient(circle at top right, #f1f5f9, #f8fafc)}[data-theme=dark]{--primary: #818cf8;--secondary: #64748b;--accent: #34d399;--warning: #fbbf24;--danger: #f87171;--background: #000000;--card-bg: #111111;--text-main: #ffffff;--text-muted: #94a3b8;--glass-border: rgba(255, 255, 255, .03);--body-bg: radial-gradient(circle at top right, #111111, #000000)}*{margin:0;padding:0;box-sizing:border-box;font-family:Plus Jakarta Sans,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}body{background:var(--body-bg);background-attachment:fixed;color:var(--text-main);min-height:100vh;padding:24px 20px 32px;position:relative;transition:background .3s ease,color .3s ease}.app-container{max-width:1400px;margin:0 auto}.header-top{display:flex;justify-content:space-between;align-items:center;width:100%;margin-bottom:20px}.theme-toggle-btn{position:fixed;top:80px;right:20px;z-index:1002;width:48px;height:48px;border-radius:50%;border:1px solid var(--glass-border);background:var(--card-bg);color:var(--primary);font-size:1.25rem;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px #0000004d;transition:all .2s}.theme-toggle-btn span{display:none}.theme-toggle-btn:hover{transform:translateY(-2px);border-color:var(--primary);background:#ffffff0d}.theme-toggle-btn i{color:var(--primary);font-size:1rem}.app-body{display:flex;gap:0;margin-top:10px;min-height:60vh}.main-nav{flex-shrink:0;width:220px;background:var(--card-bg);border:1px solid var(--glass-border);border-radius:14px;padding:12px 0;height:fit-content;position:sticky;top:24px}.main-nav-list{list-style:none;margin:0;padding:0}.main-nav-list li{margin:0}.main-nav-btn{width:100%;display:flex;align-items:center;gap:12px;padding:14px 20px;border:none;background:none;color:var(--text-muted);font-size:.95rem;font-weight:500;cursor:pointer;text-align:left;transition:all .2s}.main-nav-btn i{font-size:1.1rem;width:24px;text-align:center;color:var(--text-muted)}.main-nav-btn:hover{color:var(--text-main);background:#ffffff0d}.main-nav-btn.active{color:var(--primary);background:#ffffff1a;border-right:3px solid var(--primary)}.main-nav-btn.active i{color:var(--primary)}.app-main{flex:1;min-width:0;padding-left:24px}@media (max-width: 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var(--glass-border);border-radius:12px;color:#fff;transition:.3s}input:invalid,select:invalid{border-color:var(--danger);background:#ef44441a}.error-message{color:var(--danger);font-size:.75rem;margin-top:5px;display:none}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:15px}.btn-group{display:flex;flex-direction:column;gap:12px;margin-top:10px}.btn{width:100%;padding:16px;border:none;border-radius:12px;font-weight:700;cursor:pointer;transition:.3s;display:flex;align-items:center;justify-content:center;gap:10px}.btn-generate{background:#fff;color:#000}.btn-download{background:#ffffff0d;color:var(--text-main);border:1px solid var(--glass-border)}.btn-api{background:#f59e0b1a;color:var(--warning);border:1px solid rgba(245,158,11,.3)}.btn-spotify{background:#1db9541a;color:#1db954;border:1px solid rgba(29,185,84,.3)}.btn-timer{background:#ec48991a;color:#fff;border:1px solid rgba(236,72,153,.3)}.btn:hover{transform:translateY(-2px);box-shadow:0 10px 20px 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