:root {
            --primary-color: #2c853f;
            --primary-dark: #1f5e2c;
            --primary-light: #4caf50;
            --accent-color: #2196f3;
            --text-dark: #2d3748;
            --text-light: #ffffff;
            --text-muted: #718096;
            --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e6f0fa 100%);
            --card-gradient: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
            --shadow-light: rgba(0, 0, 0, 0.08);
            --shadow-medium: rgba(0, 0, 0, 0.12);
            --shadow-dark: rgba(0, 0, 0, 0.2);
            --border-radius: 16px;
            --border-radius-sm: 8px;
            --transition-speed: 0.3s;
        }

        /* Reset y estilos base */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', 'Segoe UI', sans-serif;
            background: var(--bg-gradient);
            color: var(--text-dark);
            line-height: 1.6;
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
        }

        /* Efecto de partículas en el fondo */
        .particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            opacity: 0.3;
        }

        .particle {
            position: absolute;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
            border-radius: 50%;
            animation: float 15s infinite ease-in-out;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(180deg); }
        }

        /* Encabezado premium */
        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.5rem 3rem;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 4px 20px var(--shadow-light);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }

        .header::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
        }

        .header img {
            height: 70px;
            object-fit: contain;
            filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
            transition: transform var(--transition-speed) ease;
        }

        .header img:hover {
            transform: scale(1.05);
        }

        /* Contenedor principal */
        .login-container {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 120px 20px 40px;
        }

        /* Tarjeta de login premium */
        .login-card {
            background: var(--card-gradient);
            padding: 3rem;
            border-radius: var(--border-radius);
            box-shadow: 0 20px 40px var(--shadow-medium);
            text-align: center;
            width: 100%;
            max-width: 420px;
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            transform-style: preserve-3d;
            perspective: 1000px;
        }

        .login-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
        }

        .login-card::after {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: linear-gradient(
                45deg,
                transparent 30%,
                rgba(255, 255, 255, 0.1) 50%,
                transparent 70%
            );
            transform: rotate(45deg);
            animation: shimmer 3s infinite;
        }

        @keyframes shimmer {
            0% { transform: translateX(-100%) rotate(45deg); }
            100% { transform: translateX(100%) rotate(45deg); }
        }

        /* Logo central */
        .logo-container {
            position: relative;
            margin-bottom: 2rem;
            display: flex;
            justify-content: center;
        }

        .logo-main {
            width: 180px;
            height: 180px;
            object-fit: contain;
            filter: drop-shadow(0 8px 16px rgba(44, 133, 63, 0.2));
            animation: pulse 2s infinite ease-in-out;
            position: relative;
            z-index: 2;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }

        .logo-glow {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(44, 133, 63, 0.2) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 1;
        }

        /* Encabezado del formulario */
        .login-header {
            margin-bottom: 2rem;
            position: relative;
            z-index: 2;
        }

        .login-header h1 {
            font-size: 2.2rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 0.8rem;
            letter-spacing: -0.5px;
        }

        .login-header p {
            color: var(--text-muted);
            font-size: 1.1rem;
            font-weight: 400;
        }

        /* Formulario premium */
        .login-form {
            position: relative;
            z-index: 2;
        }

        .input-group {
            margin-bottom: 1.8rem;
            text-align: left;
            position: relative;
        }

        .input-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.7rem;
            color: var(--text-dark);
            font-size: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .input-group label i {
            color: var(--primary-color);
            font-size: 1.1rem;
        }

        .input-field {
            position: relative;
            width: 100%;
        }

        .input-field input {
            width: 100%;
            padding: 1.2rem 1rem 1.2rem 3rem;
            font-size: 1rem;
            border: 2px solid #e2e8f0;
            border-radius: var(--border-radius-sm);
            background: rgba(255, 255, 255, 0.9);
            color: var(--text-dark);
            transition: all var(--transition-speed) ease;
            outline: none;
        }

        .input-field input:focus {
            border-color: var(--primary-color);
            background: white;
            box-shadow: 0 0 0 3px rgba(44, 133, 63, 0.1);
            transform: translateY(-2px);
        }

        .input-field i {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 1.2rem;
            transition: color var(--transition-speed) ease;
        }

        .input-field input:focus + i {
            color: var(--primary-color);
        }

        .password-toggle {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--text-muted);
            cursor: pointer;
            font-size: 1.2rem;
            transition: color var(--transition-speed) ease;
        }

        .password-toggle:hover {
            color: var(--primary-color);
        }

        /* Botón de enviar premium */
        .submit-btn {
            position: relative;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: var(--text-light);
            padding: 1.2rem 2.5rem;
            font-size: 1.1rem;
            font-weight: 600;
            border: none;
            border-radius: var(--border-radius-sm);
            cursor: pointer;
            width: 100%;
            transition: all var(--transition-speed) ease;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(44, 133, 63, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.8rem;
            margin-top: 0.5rem;
        }

        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 25px rgba(44, 133, 63, 0.4);
        }

        .submit-btn:active {
            transform: translateY(-1px);
        }

        .submit-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.7s;
        }

        .submit-btn:hover::before {
            left: 100%;
        }

        /* Pie de página */
        .footer {
            text-align: center;
            padding: 2rem;
            margin-top: 2rem;
            color: var(--text-muted);
            font-size: 0.9rem;
            position: relative;
        }

        .footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 2px;
            background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
        }

        /* Responsive design */
        @media (max-width: 1024px) {
            .header {
                padding: 1.2rem 2rem;
            }
            
            .header img {
                height: 60px;
            }
            
            .login-card {
                padding: 2.5rem;
            }
        }

        @media (max-width: 768px) {
            .header {
                padding: 1rem;
                flex-direction: column;
                gap: 1rem;
            }
            
            .header img {
                height: 50px;
            }
            
            .login-container {
                padding: 180px 20px 40px;
            }
            
            .login-card {
                padding: 2rem;
            }
            
            .logo-main {
                width: 140px;
                height: 140px;
            }
            
            .logo-glow {
                width: 160px;
                height: 160px;
            }
            
            .login-header h1 {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 480px) {
            .login-card {
                padding: 1.5rem;
            }
            
            .logo-main {
                width: 120px;
                height: 120px;
            }
            
            .logo-glow {
                width: 140px;
                height: 140px;
            }
            
            .login-header h1 {
                font-size: 1.5rem;
            }
            
            .input-field input {
                padding: 1rem 1rem 1rem 2.8rem;
                font-size: 0.95rem;
            }
            
            .submit-btn {
                padding: 1rem 2rem;
                font-size: 1rem;
            }
        }

        /* Animación de entrada */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .login-card {
            animation: fadeInUp 0.8s ease-out forwards;
        }

        /* Efecto de carga del botón */
        .submit-btn.loading {
            pointer-events: none;
            opacity: 0.8;
        }

        .submit-btn.loading::after {
            content: '';
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-top-color: white;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }