:root {
            --primary-cyan: #00f0ff;
            --primary-purple: #b537f2;
            --primary-blue: #4d7cff;
            --dark-bg: #0a0e27;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.1);
            --text-primary: #e0e6ff;
            --text-secondary: #8b92b8;
            --success: #00ff88;
            --danger: #ff4757;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: var(--dark-bg);
            color: var(--text-primary);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background-image: 
                radial-gradient(circle at 10% 20%, rgba(77, 124, 255, 0.1) 0%, transparent 20%),
                radial-gradient(circle at 90% 80%, rgba(181, 55, 242, 0.1) 0%, transparent 20%);
        }

        .container {
            width: 100%;
            max-width: 420px;
            padding: 20px;
        }

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

        .logo {
            font-size: 28px;
            font-weight: 700;
            background: linear-gradient(90deg, var(--primary-cyan), var(--primary-purple));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 8px;
        }

        .tagline {
            font-size: 14px;
            color: var(--text-secondary);
            letter-spacing: 1px;
        }

        .auth-container {
            background: var(--glass-bg);
            backdrop-filter: blur(10px);
            border: 1px solid var(--glass-border);
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        }

        .auth-tabs {
            display: flex;
            border-bottom: 1px solid var(--glass-border);
        }

        .auth-tab {
            flex: 1;
            padding: 16px;
            text-align: center;
            background: transparent;
            border: none;
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .auth-tab.active {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
            position: relative;
        }

        .auth-tab.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, var(--primary-cyan), var(--primary-purple));
        }

        .auth-form {
            padding: 30px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-size: 14px;
            color: var(--text-secondary);
        }

        .form-input {
            width: 100%;
            padding: 14px 16px;
            background: rgba(255, 255, 255, 0.07);
            border: 1px solid var(--glass-border);
            border-radius: 8px;
            color: var(--text-primary);
            font-size: 15px;
            transition: all 0.3s ease;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 2px rgba(77, 124, 255, 0.2);
        }

        .password-container {
            position: relative;
        }

        .toggle-password {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--text-secondary);
            cursor: pointer;
        }

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

        .remember-me {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .remember-checkbox {
            appearance: none;
            width: 18px;
            height: 18px;
            border: 1px solid var(--glass-border);
            border-radius: 4px;
            background: rgba(255, 255, 255, 0.07);
            position: relative;
            cursor: pointer;
        }

        .remember-checkbox:checked {
            background: var(--primary-blue);
            border-color: var(--primary-blue);
        }

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

        .forgot-password {
            color: var(--primary-blue);
            text-decoration: none;
            transition: color 0.3s ease;
        }

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

        .submit-btn {
            width: 100%;
            padding: 14px;
            background: linear-gradient(90deg, var(--primary-cyan), var(--primary-purple));
            border: none;
            border-radius: 8px;
            color: white;
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 20px;
        }

        .submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 240, 255, 0.3);
        }

        .divider {
            display: flex;
            align-items: center;
            margin: 25px 0;
            color: var(--text-secondary);
            font-size: 14px;
        }

        .divider::before,
        .divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: var(--glass-border);
        }

        .divider span {
            padding: 0 15px;
        }

        .social-login {
            display: flex;
            gap: 15px;
            margin-bottom: 25px;
        }

        .social-btn {
            flex: 1;
            padding: 12px;
            background: rgba(255, 255, 255, 0.07);
            border: 1px solid var(--glass-border);
            border-radius: 8px;
            color: var(--text-primary);
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .social-btn:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--primary-blue);
        }

        .signup-link {
            text-align: center;
            font-size: 14px;
            color: var(--text-secondary);
        }

        .signup-link a {
            color: var(--primary-blue);
            text-decoration: none;
            font-weight: 600;
            transition: color 0.3s ease;
        }

        .signup-link a:hover {
            color: var(--primary-cyan);
        }

        .hidden {
            display: none;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .fade-in {
            animation: fadeIn 0.4s ease forwards;
        }