:root {
            --primary-dark: #2c3e50;
            --primary-blue: #3498db;
            --primary-light: #ecf0f1;
            --gradient: linear-gradient(135deg, #2c3e50, #3498db);
            --shadow: 0 10px 40px rgba(0,0,0,0.2);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: var(--gradient);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
            position: relative;
            overflow-x: hidden;
            overflow-y: auto;
        }
        
        body::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.05" d="M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,192C1248,192,1344,128,1392,96L1440,64L1440,320L0,320Z"></path></svg>');
            background-size: cover;
            background-position: center;
            animation: wave 15s linear infinite;
        }
        
        @keyframes wave {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-20px); }
        }
        
        .login-container {
            position: relative;
            z-index: 1;
            width: 100%;
            max-width: 420px;
        }
        
        .login-box {
            background: white;
            padding: 50px 40px;
            border-radius: 20px;
            box-shadow: var(--shadow);
            position: relative;
            overflow: hidden;
        }
        
        .login-box::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 5px;
            background: var(--gradient);
        }
        
        .logo-section {
            text-align: center;
            margin-bottom: 35px;
        }
        
        .logo-icon {
            width: 80px;
            height: 80px;
            background: var(--gradient);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            box-shadow: 0 5px 20px rgba(52, 152, 219, 0.3);
        }
        
        .logo-icon i {
            font-size: 2.5rem;
            color: white;
        }
        
        h2 {
            text-align: center;
            color: var(--primary-dark);
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        
        .subtitle {
            text-align: center;
            color: #666;
            font-size: 0.95rem;
            margin-bottom: 35px;
        }
        
        .form-group {
            margin-bottom: 25px;
            position: relative;
        }
        
        .form-label {
            display: block;
            color: var(--primary-dark);
            font-weight: 600;
            margin-bottom: 8px;
            font-size: 0.95rem;
        }
        
        .input-wrapper {
            position: relative;
        }
        
        .input-icon {
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: #999;
            font-size: 1.1rem;
        }
        
        input[type="email"],
        input[type="password"],
        input[type="text"] {
            width: 100%;
            padding: 14px 45px 14px 45px;
            border: 2px solid #e1e8ed;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s;
            outline: none;
            text-align: right;
            direction: ltr;
        }
        
        input[type="email"] {
            direction: ltr;
            text-align: left;
        }
        
        input[type="email"]:focus,
        input[type="password"]:focus,
        input[type="text"]:focus {
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 4px rgba(52, 152, 219, 0.1);
        }
        
        .password-toggle {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: #999;
            cursor: pointer;
            font-size: 1.1rem;
            padding: 5px;
            transition: color 0.3s;
            z-index: 10;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 30px;
            height: 30px;
        }
        
        .password-toggle:hover {
            color: var(--primary-blue);
        }
        
        .password-toggle:focus {
            outline: none;
            color: var(--primary-blue);
        }
        
        .password-toggle i {
            pointer-events: none;
        }
        
        button[type="submit"] {
            width: 100%;
            padding: 15px;
            background: var(--gradient);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
        }
        
        button[type="submit"]:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
        }
        
        button[type="submit"]:active {
            transform: translateY(0);
        }
        
        .error {
            background: #fee;
            color: #c33;
            padding: 12px 15px;
            border-radius: 8px;
            text-align: center;
            margin-bottom: 20px;
            border-right: 4px solid #c33;
            font-size: 0.95rem;
            animation: shake 0.5s;
        }
        
        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-10px); }
            75% { transform: translateX(10px); }
        }
        
        .demo-credentials {
            background: #fff3cd;
            padding: 15px;
            border-radius: 10px;
            margin-bottom: 25px;
            text-align: center;
            border-right: 4px solid #ffc107;
        }
        
        .demo-credentials p {
            color: #856404;
            font-size: 0.9rem;
            margin: 5px 0;
        }
        
        .demo-credentials i {
            color: #ffc107;
            margin-left: 8px;
        }
        
        .demo-credentials code {
            background: #fff;
            padding: 2px 8px;
            border-radius: 4px;
            font-family: monospace;
            color: var(--primary-dark);
        }
        
        .contact-info {
            text-align: center;
            margin-top: 25px;
            padding-top: 20px;
            border-top: 1px solid #e1e8ed;
        }
        
        .contact-info p {
            color: #666;
            font-size: 0.9rem;
        }
        
        .contact-info a {
            color: var(--primary-blue);
            text-decoration: none;
            font-weight: 600;
        }
        
        .contact-info a:hover {
            text-decoration: underline;
        }
        
        .footer-text {
            text-align: center;
            color: white;
            margin-top: 25px;
            font-size: 0.85rem;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
            line-height: 1.6;
        }
        
        /* Responsive */
        @media (max-width: 480px) {
            .login-box {
                padding: 40px 25px;
            }
            
            h2 {
                font-size: 1.5rem;
            }
        }