:root {
            /* Aviation-themed color palette */
            --sky-blue: #4A90E2;
            --cloud-white: #F8FAFE;
            --horizon-blue: #6BB6FF;
            --aircraft-silver: #C0C8D1;
            --sunset-orange: #FF8C42;
            --deep-blue: #2C5282;
            --font-serif: 'Georgia', 'Times New Roman', serif;
            --font-sans-serif: 'Helvetica Neue', 'Arial', sans-serif;
        }

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

        body {
            font-family: var(--font-sans-serif);
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
            <?php if (!empty($backgroundImage)): ?>
            background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.3)), url('<?php echo $backgroundImage; ?>');
            background-position: center;
            background-size: cover;
            background-repeat: no-repeat;
            background-attachment: fixed;
            <?php else: ?>
            /* Clean neutral background */
            background: 
                linear-gradient(180deg, 
                    rgba(255, 255, 255, 1) 0%,    
                    rgba(248, 250, 252, 1) 25%,    
                    rgba(241, 245, 249, 1) 50%,    
                    rgba(236, 242, 247, 1) 75%,    
                    rgba(226, 232, 240, 1) 100%      
                );
            background-size: 100% 100%;
            background-repeat: no-repeat;
            <?php endif; ?>
        }

        /* Floating clouds animation */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: 
                radial-gradient(ellipse 200px 100px at 20% 30%, rgba(255,255,255,0.1) 0%, transparent 50%),
                radial-gradient(ellipse 300px 150px at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 50%),
                radial-gradient(ellipse 250px 120px at 50% 70%, rgba(255,255,255,0.06) 0%, transparent 50%);
            animation: floating-clouds 30s ease-in-out infinite;
            pointer-events: none;
            z-index: 1;
        }

        @keyframes floating-clouds {
            0%, 100% { 
                background-position: 20% 30%, 80% 20%, 50% 70%; 
            }
            50% { 
                background-position: 30% 35%, 70% 15%, 60% 75%; 
            }
        }

        .login-container {
            position: relative;
            z-index: 2;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 2rem;
        }

        .login-card {
            background: linear-gradient(135deg, rgba(248, 250, 254, 0.95) 0%, rgba(255, 255, 255, 0.9) 100%);
            backdrop-filter: blur(20px);
            border-radius: 20px;
            padding: 3rem;
            box-shadow: 
                0 20px 60px rgba(74, 144, 226, 0.15),
                0 0 0 1px rgba(255, 255, 255, 0.2);
            max-width: 450px;
            width: 100%;
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(74, 144, 226, 0.1);
        }

        .login-card::before {
            content: '✈️';
            position: absolute;
            top: -10px;
            right: 20px;
            font-size: 2rem;
            opacity: 0.3;
            animation: plane-fly 8s ease-in-out infinite;
        }

        @keyframes plane-fly {
            0%, 100% { transform: translateX(0px) translateY(0px) rotate(0deg); }
            25% { transform: translateX(10px) translateY(-5px) rotate(5deg); }
            50% { transform: translateX(20px) translateY(0px) rotate(0deg); }
            75% { transform: translateX(10px) translateY(5px) rotate(-5deg); }
        }

        .login-header {
            text-align: center;
            margin-bottom: 2.5rem;
        }

        .login-logo {
            font-family: var(--font-serif);
            font-size: 2.5rem;
            font-weight: bold;
            background: linear-gradient(135deg, var(--sky-blue) 0%, var(--horizon-blue) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.5rem;
            position: relative;
        }

        .login-logo::before {
            content: '🛩️';
            position: absolute;
            left: -40px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.8rem;
            animation: logo-pulse 3s ease-in-out infinite;
        }

        @keyframes logo-pulse {
            0%, 100% { transform: translateY(-50%) scale(1); opacity: 0.8; }
            50% { transform: translateY(-50%) scale(1.1); opacity: 1; }
        }

        .login-subtitle {
            color: var(--deep-blue);
            font-size: 1.1rem;
            opacity: 0.8;
            margin-bottom: 1rem;
        }

        .form-group {
            margin-bottom: 1.5rem;
            position: relative;
        }

        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            color: var(--deep-blue);
            font-weight: 600;
            font-size: 0.95rem;
        }

        .form-input {
            width: 100%;
            padding: 1rem 1rem 1rem 3rem;
            border: 2px solid rgba(74, 144, 226, 0.2);
            border-radius: 12px;
            font-size: 1rem;
            background: rgba(255, 255, 255, 0.9);
            transition: all 0.3s ease;
            color: var(--deep-blue);
        }

        .form-input:focus {
            outline: none;
            border-color: var(--sky-blue);
            box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
            background: white;
        }

        .input-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--sky-blue);
            font-size: 1.1rem;
            pointer-events: none;
            z-index: 2;
        }

        .password-toggle {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--sky-blue);
            font-size: 1.1rem;
            cursor: pointer;
            z-index: 2;
            transition: color 0.3s ease;
        }

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

        .remember-me {
            display: flex;
            align-items: center;
            margin-bottom: 2rem;
        }

        .remember-me input[type="checkbox"] {
            margin-right: 0.5rem;
            transform: scale(1.2);
            accent-color: var(--sky-blue);
        }

        .remember-me label {
            color: var(--deep-blue);
            font-size: 0.9rem;
            cursor: pointer;
        }

        .login-btn {
            width: 100%;
            padding: 1rem;
            background: linear-gradient(135deg, var(--sky-blue) 0%, var(--horizon-blue) 100%);
            border: none;
            border-radius: 12px;
            color: white;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .login-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(74, 144, 226, 0.4);
        }

        .login-btn::before {
            content: '🚀';
            margin-right: 0.5rem;
        }

        .error-message {
            background: linear-gradient(135deg, #ff6b6b 0%, #ff5252 100%);
            color: white;
            padding: 1rem;
            border-radius: 12px;
            margin-bottom: 1.5rem;
            text-align: center;
            font-weight: 500;
            animation: shake 0.5s ease-in-out;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-5px); }
            75% { transform: translateX(5px); }
        }

        .login-footer {
            text-align: center;
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(74, 144, 226, 0.1);
        }

        .login-footer a {
            color: var(--sky-blue);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .login-footer a:hover {
            color: var(--deep-blue);
            text-decoration: underline;
        }

        .photographer-credit {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-size: 0.8rem;
            z-index: 3;
            backdrop-filter: blur(10px);
        }

        /* Mobile responsiveness */
        @media (max-width: 768px) {
            .login-container {
                padding: 1rem;
            }
            
            .login-card {
                padding: 2rem;
                margin: 1rem;
            }
            
            .login-logo {
                font-size: 2rem;
            }
            
            .login-logo::before {
                left: -30px;
                font-size: 1.5rem;
            }
        }

        @media (max-width: 480px) {
            .login-card {
                padding: 1.5rem;
                border-radius: 15px;
            }
            
            .photographer-credit {
                bottom: 10px;
                right: 10px;
                font-size: 0.7rem;
                padding: 0.4rem 0.8rem;
            }
        }