:root {
            --bg: #0f172a;
            --surface: #1e293b;
            --accent: #818cf8;
            --accent-gradient: linear-gradient(135deg, #818cf8 0%, #6366f1 100%);
            --text: #f8fafc;
            --border: #334155;
            --hover: rgba(129, 140, 248, 0.1);
            --radius: 12px;
            --shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
            --error: #ef4444;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
        }

        body {
            background: var(--bg);
            color: var(--text);
            min-height: 100vh;
            display: grid;
            place-items: center;
            line-height: 1.6;
        }

        .auth-section {
            width: 100%;
            max-width: 440px;
            margin: 1rem;
            padding: 3rem 2.5rem;
            background: var(--surface);
            border-radius: calc(var(--radius) * 2);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            position: relative;
            overflow: hidden;
        }

        .form-header {
            text-align: center;
            margin-bottom: 2.5rem;
            position: relative;
        }

        .form-header h2 {
            font-size: 2rem;
            margin-bottom: 0.75rem;
            letter-spacing: -0.025em;
            background: var(--accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .form-header p {
            color: rgba(248, 250, 252, 0.8);
            font-size: 0.95rem;
            max-width: 300px;
            margin: 0 auto;
        }

        .input-container {
            position: relative;
            margin-bottom: 1.75rem;
        }

        .input-container input {
            width: 100%;
            padding: 1rem 1rem 1rem 3rem;
            background: var(--bg);
            border: 2px solid var(--border);
            border-radius: var(--radius);
            color: var(--text);
            font-size: 1rem;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .input-container input:focus {
            border-color: var(--accent);
            outline: none;
            box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.15);
        }

        .input-container label {
            position: absolute;
            left: 3rem;
            top: 50%;
            transform: translateY(-50%);
            color: rgba(248, 250, 252, 0.6);
            pointer-events: none;
            transition: all 0.3s ease;
        }

        .input-container input:focus ~ label,
        .input-container input:not(:placeholder-shown) ~ label {
            top: -0.6rem;
            left: 1rem;
            font-size: 0.85rem;
            color: var(--accent);
            background: var(--surface);
            padding: 0 0.5rem;
        }

        .input-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            width: 20px;
            height: 20px;
            color: rgba(248, 250, 252, 0.6);
            transition: color 0.3s ease;
        }

        .input-container input:focus ~ .input-icon {
            color: var(--accent);
        }

        .auth-button {
            width: 100%;
            padding: 1.125rem;
            background: var(--accent-gradient);
            color: var(--text);
            border: none;
            border-radius: var(--radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
        }

        .auth-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px -10px rgba(99, 102, 241, 0.4);
        }

        .form-footer {
            margin-top: 2rem;
            text-align: center;
            font-size: 0.95rem;
            color: rgba(248, 250, 252, 0.8);
        }

        .form-link {
            color: var(--accent);
            font-weight: 500;
            text-decoration: none;
            position: relative;
        }

        .form-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 1px;
            background: currentColor;
            transition: width 0.3s ease;
        }

        .form-link:hover::after {
            width: 100%;
        }

        .auth-form {
            opacity: 1;
            transform: translateY(0);
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            width: 100%;
        }

        .auth-form.hidden {
            opacity: 0;
            transform: translateY(20px);
            pointer-events: none;
            position: absolute;
            top: 0;
            left: 0;
            padding: 3rem 2.5rem;
        }

        .error-message {
            color: var(--error);
            background: rgba(239, 68, 68, 0.1);
            padding: 0.75rem 1rem;
            border-radius: var(--radius);
            border: 1px solid var(--error);
            margin-bottom: 1.5rem;
            text-align: center;
            font-size: 0.9rem;
        }

        @media (max-width: 480px) {
            .auth-section {
                padding: 2rem 1.5rem;
            }
            
            .input-container input {
                padding-left: 2.75rem;
            }
        }