:root {
            --font-family-sans-serif: 'Poppins', sans-serif;
            --border-radius-xl: 1rem;
            --border-radius-lg: 0.75rem;
            
            /* Colores Light */
            --bg-body: #f0f2f5;
            --bg-card: #ffffff;
            --text-main: #2d3748;
            --text-muted: #718096;
            --accent-color: #6366f1;
            --accent-hover: #4f46e5;
            --shadow-soft: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            
            /* Form Specifics */
            --input-bg: #f8fafc;
            --input-border: #e2e8f0;
            --input-focus-border: #6366f1;
            --input-focus-shadow: rgba(99, 102, 241, 0.15);
        }

        [data-bs-theme="dark"] {
            --bg-body: #111827;
            --bg-card: #1f2937;
            --text-main: #f9fafb;
            --text-muted: #9ca3af;
            --shadow-soft: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
            
            --input-bg: #374151;
            --input-border: #4b5563;
        }

        body {
            font-family: var(--font-family-sans-serif);
            background-color: var(--bg-body);
            color: var(--text-main);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow-x: hidden;
            position: relative;
            transition: background-color 0.3s ease;
        }

        /* --- Fondo Decorativo (Blobs) --- */
        .bg-decoration {
            position: absolute;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: -1;
        }
        
        .blob {
            position: absolute;
            filter: blur(80px);
            opacity: 0.6;
            z-index: -1;
            animation: float 10s infinite ease-in-out;
        }

        .blob-1 {
            top: -10%;
            left: 20%;
            width: 500px;
            height: 500px;
            background: linear-gradient(135deg, #f59e0b 0%, #ea580c 100%); /* Variante naranja/ámbar */
            border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
        }

        .blob-2 {
            bottom: -10%;
            right: -10%;
            width: 450px;
            height: 450px;
            background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%); /* Variante violeta */
            border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
            animation-delay: -5s;
        }

        @keyframes float {
            0% { transform: translate(0, 0) rotate(0deg); }
            50% { transform: translate(20px, 40px) rotate(5deg); }
            100% { transform: translate(0, 0) rotate(0deg); }
        }

        /* --- Auth Card --- */
        .auth-card {
            background-color: var(--bg-card);
            border: none;
            border-radius: var(--border-radius-xl);
            box-shadow: var(--shadow-soft);
            padding: 3rem;
            width: 100%;
            max-width: 450px;
            position: relative;
            z-index: 10;
            text-align: center;
        }

        .icon-box {
            width: 70px;
            height: 70px;
            background-color: rgba(99, 102, 241, 0.1);
            color: var(--accent-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            margin: 0 auto 1.5rem auto;
        }

        /* Inputs Modernos */
        .form-control {
            background-color: var(--input-bg);
            border: 1px solid var(--input-border);
            border-radius: var(--border-radius-lg);
            padding: 0.75rem 1rem;
            font-size: 0.95rem;
            color: var(--text-main);
        }

        .form-control:focus {
            background-color: var(--bg-card);
            border-color: var(--input-focus-border);
            box-shadow: 0 0 0 4px var(--input-focus-shadow);
        }

        .form-floating > .form-control:focus ~ label,
        .form-floating > .form-control:not(:placeholder-shown) ~ label {
            color: var(--accent-color);
            transform: scale(0.85) translateY(-0.75rem) translateX(0.15rem);
        }
        
        .form-floating > label { color: var(--text-muted); text-align: left; }

        /* Botones */
        .btn-primary-custom {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
            color: white;
            padding: 0.8rem;
            border-radius: var(--border-radius-lg);
            font-weight: 500;
            width: 100%;
            transition: all 0.2s;
        }
        
        .btn-primary-custom:hover {
            background-color: var(--accent-hover);
            border-color: var(--accent-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
        }

        /* Theme Switcher */
        .theme-toggle-fixed {
            position: absolute;
            top: 20px;
            right: 20px;
        }

        .theme-btn {
            background: var(--bg-card);
            border: 1px solid rgba(128, 128, 128, 0.2);
            color: var(--text-main);
            width: 45px;
            height: 45px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
            box-shadow: var(--shadow-soft);
        }
        .theme-btn:hover { background-color: var(--accent-color); color: white; border-color: var(--accent-color); }