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

        :root {
            --primary-color: #0e9eff;
            --primary-dark: #0077cc;
            --text-dark: #1a1a1a;
            --text-gray: #666;
            --bg-light: #f8f9fa;
            --white: #ffffff;
            --shadow: 0 2px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 10px 40px rgba(14, 158, 255, 0.15);
            --gradient: linear-gradient(135deg, #0e9eff 0%, #0077cc 100%);
            --error: #ff4757;
            --success: #00c853;
        }

        body {
            font-family: 'Cairo', sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background: var(--white);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .login-container {
            width: 100%;
            max-width: 450px;
            background: var(--white);
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            overflow: hidden;
            animation: slideUp 0.5s ease-out;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .login-header {
            background: var(--gradient);
            padding: 40px 30px;
            text-align: center;
            color: white;
        }

        .logo {
            font-size: 42px;
            font-weight: 900;
            margin-bottom: 10px;
            letter-spacing: 2px;
        }

        .header-subtitle {
            font-size: 16px;
            opacity: 0.95;
            font-weight: 400;
        }

        .login-body {
            padding: 40px 30px;
        }

        .welcome-text {
            text-align: center;
            margin-bottom: 30px;
        }

        .welcome-text h2 {
            font-size: 28px;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: 8px;
        }

        .welcome-text p {
            font-size: 15px;
            color: var(--text-gray);
        }

        .form-group {
            margin-bottom: 25px;
        }

        .form-label {
            display: block;
            font-size: 15px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .form-input-wrapper {
            position: relative;
        }

        .form-input {
            width: 100%;
            padding: 15px 45px 15px 15px;
            border: 2px solid #e0e0e0;
            border-radius: 12px;
            font-size: 15px;
            font-family: 'Cairo', sans-serif;
            transition: all 0.3s;
            background: var(--bg-light);
        }

        .form-input:focus {
            outline: none;
            border-color: var(--primary-color);
            background: var(--white);
            box-shadow: 0 0 0 4px rgba(14, 158, 255, 0.1);
        }

        .form-input.error {
            border-color: var(--error);
        }

        .input-icon {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 20px;
            color: var(--text-gray);
        }

        .toggle-password {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            font-size: 20px;
            cursor: pointer;
            color: var(--text-gray);
            padding: 5px;
        }

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

        .error-message {
            color: var(--error);
            font-size: 13px;
            margin-top: 8px;
            display: none;
        }

        .error-message.show {
            display: block;
        }

        .form-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            font-size: 14px;
        }

        .checkbox-wrapper {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .checkbox-wrapper input[type="checkbox"] {
            width: 18px;
            height: 18px;
            cursor: pointer;
        }

        .checkbox-wrapper label {
            cursor: pointer;
            color: var(--text-dark);
            font-weight: 600;
        }

        .forgot-password {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            transition: color 0.3s;
        }

        .forgot-password:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        .login-btn {
            width: 100%;
            padding: 16px;
            background: var(--gradient);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 17px;
            font-weight: 700;
            font-family: 'Cairo', sans-serif;
            cursor: pointer;
            transition: all 0.3s;
            margin-bottom: 20px;
        }

        .login-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(14, 158, 255, 0.3);
        }

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

        .login-btn.loading {
            opacity: 0.7;
            cursor: not-allowed;
        }
        .social-login {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-bottom: 25px;
        }

        .social-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 12px;
            background: var(--white);
            font-size: 14px;
            font-weight: 600;
            font-family: 'Cairo', sans-serif;
            cursor: pointer;
            transition: all 0.3s;
        }

        .social-btn:hover {
            border-color: var(--primary-color);
            background: rgba(14, 158, 255, 0.05);
        }

        .social-icon {
            font-size: 20px;
        }

        .signup-link {
            text-align: center;
            font-size: 15px;
            color: var(--text-gray);
        }

        .signup-link a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 700;
            transition: color 0.3s;
        }

        .signup-link a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        /* Responsive */
        @media (max-width: 640px) {
            body {
                padding: 15px;
            }

            .login-container {
                border-radius: 15px;
            }

            .login-header {
                padding: 30px 20px;
            }

            .logo {
                font-size: 36px;
            }

            .header-subtitle {
                font-size: 14px;
            }

            .login-body {
                padding: 30px 20px;
            }

            .welcome-text h2 {
                font-size: 24px;
            }

            .welcome-text p {
                font-size: 14px;
            }

            .form-input {
                padding: 13px 40px 13px 13px;
                font-size: 14px;
            }

            .login-btn {
                padding: 14px;
                font-size: 16px;
            }

            .social-login {
                grid-template-columns: 1fr;
            }

            .form-options {
                flex-direction: column;
                gap: 12px;
                align-items: flex-start;
            }
        }