:root {
            --primary: linear-gradient(135deg, #1a1a1a 0%, #2c2c2c 100%);
            --primary-solid: #1a1a1a;
            --accent: #d4af37;
            --accent-dark: #b8941f;
            --background: #0f0f0f;
            --surface: #ffffff;
            --text: #2c3e50;
            --text-muted: #6c757d;
            --shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            --shadow-hover: 0 30px 80px rgba(0, 0, 0, 0.4);
            --font-display: 'Oswald', sans-serif;
            --font-body: 'Open Sans', sans-serif;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: var(--font-body);
            background: var(--background);
            min-height: 100vh;
            overflow-x: hidden;
        }

        .container-fluid {
            padding: 0 !important;
            margin: 0;
            min-height: 100vh;
        }

        .row.h-100 {
            margin: 0;
            min-height: 100vh;
        }

        /* Columna de branding */
        #branding-column {
            background: linear-gradient(135deg, rgba(26, 26, 26, 0.95), rgba(44, 44, 44, 0.9)),
                        url('https://images.unsplash.com/photo-1585747860715-2ba37e788b70?q=80&w=1740&auto=format&fit=crop') center/cover;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 60px 40px;
            position: relative;
            overflow: hidden;
            min-height: 100vh;
        }

        #branding-column::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: repeating-linear-gradient(
                45deg,
                transparent,
                transparent 20px,
                rgba(212, 175, 55, 0.03) 20px,
                rgba(212, 175, 55, 0.03) 40px
            );
            animation: barberPole 15s linear infinite;
        }

        @keyframes barberPole {
            0% { transform: translateX(-40px) translateY(-40px); }
            100% { transform: translateX(40px) translateY(40px); }
        }

        .branding-content {
            position: relative;
            z-index: 2;
            color: white;
        }

        .logo-section {
            margin-bottom: 40px;
        }

        .logo-container {
            width: 140px;
            height: 140px;
            border: 3px solid var(--accent);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            background: rgba(212, 175, 55, 0.1);
            backdrop-filter: blur(10px);
            position: relative;
            overflow: hidden;
            padding: 20px;
        }

        .logo-container::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: conic-gradient(transparent, var(--accent), transparent);
            animation: rotate 3s linear infinite;
            opacity: 0.3;
        }

        @keyframes rotate {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .logo-svg {
         
            width: 110px;
            height: 110px;
            position: relative;
            z-index: 1;
            filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.5));
            transition: transform 0.3s ease;
        }

        .logo-svg:hover {
            transform: scale(1.1);
        }

        .logo-svg svg {
            width: 100%;
            height: 100%;
        }

        /* Fallback para cuando el SVG no cargue */
        .logo-fallback {
            font-family: var(--font-display);
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--accent);
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
            position: relative;
            z-index: 1;
            display: none;
        }

        .branding-content h1 {
            font-family: var(--font-display);
            font-size: clamp(2.5rem, 4vw, 3.5rem);
            font-weight: 700;
            margin-bottom: 15px;
            text-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            letter-spacing: 2px;
            line-height: 1.1;
        }

        .branding-content p {
            font-size: clamp(1rem, 2vw, 1.2rem);
            font-weight: 300;
            opacity: 0.9;
            text-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
            margin-bottom: 40px;
            letter-spacing: 1px;
        }

        .brand-features {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .feature-item {
            display: flex;
            align-items: center;
            gap: 15px;
            font-size: 1rem;
            opacity: 0.9;
            font-weight: 500;
        }

        .feature-icon {
            width: 45px;
            height: 45px;
            background: rgba(212, 175, 55, 0.2);
            border: 1px solid var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            backdrop-filter: blur(10px);
            color: var(--accent);
            font-size: 1.2rem;
        }

        /* Formulario */
        #form-column {
            background: var(--surface);
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            padding: 0;
            position: relative;
        }

        #form-column::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            z-index: 0;
        }

        .login-card {
            width: 100%;
            max-width: 450px;
            padding: 60px 50px;
            background: white;
            border-radius: 20px;
            box-shadow: 0 25px 80px rgba(0, 0, 0, 0.15);
            position: relative;
            z-index: 1;
        }

        /* Header del login */
        .text-center.mb-4 {
            margin-bottom: 40px !important;
        }

        .login-card h2 {
            font-family: var(--font-display);
            font-size: 2.2rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--primary-solid), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 10px;
            letter-spacing: 1px;
        }

        .login-card .text-muted {
            color: var(--text-muted) !important;
            font-size: 1rem;
            font-weight: 400;
        }

        /* Campos de formulario */
        .input-group {
            margin-bottom: 25px;
            position: relative;
        }

        .input-group-text {
            background: linear-gradient(135deg, var(--primary-solid), #2c2c2c);
            border: 2px solid var(--primary-solid);
            border-right: none;
            border-radius: 12px 0 0 12px;
            color: var(--accent);
            font-size: 1.1rem;
            padding: 18px;
            box-shadow: 0 5px 15px rgba(26, 26, 26, 0.1);
            transition: all 0.3s ease;
        }

        .form-control-lg {
            background: white;
            border: 2px solid var(--primary-solid);
            border-left: none;
            border-radius: 0 12px 12px 0;
            padding: 18px 20px;
            font-size: 1rem;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 5px 15px rgba(26, 26, 26, 0.1);
            font-weight: 500;
        }

        .form-control:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 0.25rem rgba(212, 175, 55, 0.25), 0 10px 25px rgba(0, 0, 0, 0.1);
            background: white;
        }

        .input-group:focus-within .input-group-text {
            border-color: var(--accent);
            background: linear-gradient(135deg, var(--accent-dark), var(--accent));
            color: white;
        }

        /* Checkbox */
        .d-flex.justify-content-between.align-items-center.mb-4 {
            margin-bottom: 35px !important;
        }

        .form-check {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .form-check-input {
            width: 20px;
            height: 20px;
            border: 2px solid var(--primary-solid);
            border-radius: 4px;
            cursor: pointer;
            position: relative;
            appearance: none;
            transition: all 0.3s ease;
            margin: 0;
            background: white;
        }

        .form-check-input:checked {
            background: var(--accent);
            border-color: var(--accent);
        }

        .form-check-input:checked::after {
            content: '✓';
            position: absolute;
            color: white;
            font-size: 12px;
            font-weight: bold;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .form-check-label {
            color: var(--text-muted) !important;
            font-weight: 500;
            cursor: pointer;
            font-size: 0.95rem;
        }

        /* Botón principal */
        .btn-primary {
            background: linear-gradient(135deg, var(--primary-solid), #2c2c2c);
            border: none;
            border-radius: 12px;
            padding: 18px;
            font-size: 1.1rem;
            font-weight: 600;
            color: white;
            width: 100%;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 10px 30px rgba(26, 26, 26, 0.3);
            position: relative;
            overflow: hidden;
            font-family: var(--font-display);
            letter-spacing: 1px;
        }

        .btn-primary::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.3), transparent);
            transition: left 0.6s;
        }

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

        .btn-primary:hover {
            background: linear-gradient(135deg, var(--accent-dark), var(--accent));
            border-color: transparent;
            transform: translateY(-2px);
            box-shadow: 0 15px 40px rgba(212, 175, 55, 0.4);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-primary:focus {
            background: linear-gradient(135deg, var(--primary-solid), #2c2c2c);
            border-color: transparent;
            box-shadow: 0 0 0 0.25rem rgba(212, 175, 55, 0.25);
        }

        /* Alertas */
        .alert {
            border: none;
            border-radius: 12px;
            padding: 18px 22px;
            margin-bottom: 25px;
            font-weight: 500;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .alert-danger {
            background: linear-gradient(135deg, #dc3545, #c82333);
            color: white;
            border: none;
        }

        .alert-warning {
            background: linear-gradient(135deg, #ffc107, #e0a800);
            color: #212529;
            border: none;
        }

        /* Loading animation */
        .btn-primary.loading {
            position: relative;
            color: transparent;
        }

        .btn-primary.loading::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            top: 50%;
            left: 50%;
            margin-left: -10px;
            margin-top: -10px;
            border: 2px solid transparent;
            border-top-color: white;
            border-radius: 50%;
            animation: spin 1s ease-in-out infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Footer */
        .text-center.mt-4 {
            margin-top: 30px !important;
        }

        .text-center.mt-4 small {
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 992px) {
            #branding-column {
                min-height: 40vh;
                padding: 40px 30px;
            }
            
            #form-column {
                min-height: 60vh;
            }

            .login-card {
                padding: 40px 35px;
                max-width: 500px;
            }
        }

        @media (max-width: 768px) {
            #branding-column {
                min-height: 35vh;
                padding: 30px 25px;
            }
            
            #form-column {
                min-height: 65vh;
            }
            
            .login-card {
                padding: 35px 30px;
            }
            
            .branding-content h1 {
                font-size: 2.2rem;
            }
            
            .login-card h2 {
                font-size: 1.8rem;
            }

            .logo-container {
                width: 120px;
                height: 120px;
            }

            .logo-svg {
                width: 70px;
                height: 70px;
            }
        }

        @media (max-width: 576px) {
            .login-card {
                padding: 25px 20px;
            }

            .branding-content h1 {
                font-size: 2rem;
            }

            .logo-container {
                width: 100px;
                height: 100px;
            }

            .logo-svg {
                width: 60px;
                height: 60px;
            }
        }

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

        @keyframes slideInLeft {
            from {
                opacity: 0;
                transform: translateX(-30px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        .branding-content {
            animation: slideInLeft 0.8s ease-out;
        }

        .login-card {
            animation: fadeInUp 0.8s ease-out 0.2s both;
        }

        /* Validación visual */
        .form-control.is-valid {
            border-color: var(--accent);
            background-image: none;
        }

        .form-control.is-invalid {
            border-color: #dc3545;
            background-image: none;
        }