body {
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            min-height: 100vh;
        }

        .login-container {
            width: 100%;
            max-width: 420px;
            position: relative;
            z-index: 2;
        }

        .logo {
            text-align: center;
            margin-bottom: 32px;
        }


        .logo h1 {
            margin-bottom: 8px;
            font-size: 28px;
        }

        .logo .subtitle {
            color: var(--text-tertiary);
            font-size: 14px;
        }

        .login-card {
            padding: 40px;
        }

        .demo-info {
            background: rgba(37, 99, 235, 0.08);
            padding: 16px;
            border-radius: var(--radius-xs);
            margin-bottom: 24px;
            font-size: 13px;
            color: var(--text-secondary);
            border: 1px solid rgba(37, 99, 235, 0.15);
        }

        .demo-info strong {
            color: var(--text-primary);
            display: block;
            margin-bottom: 8px;
        }

        .error-message {
            background: rgba(220, 38, 38, 0.1);
            color: var(--coral);
            padding: 12px;
            border-radius: var(--radius-xs);
            margin-bottom: 20px;
            text-align: center;
            font-size: 14px;
            display: none;
            border: 1px solid rgba(220, 38, 38, 0.2);
        }

        .success-message {
            background: rgba(22, 163, 74, 0.1);
            color: var(--green);
            padding: 12px;
            border-radius: var(--radius-xs);
            margin-bottom: 20px;
            text-align: center;
            font-size: 14px;
            display: none;
            border: 1px solid rgba(22, 163, 74, 0.2);
        }

        .form-group {
            position: relative;
            margin-bottom: 18px;
        }

        .form-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 16px;
            z-index: 1;
            opacity: 0.6;
        }

        .form-control {
            padding-left: 44px;
        }

        .back-link {
            text-align: center;
            margin-top: 24px;
        }

        .back-link a {
            color: var(--accent);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: color 0.2s ease;
        }

        .back-link a:hover {
            color: var(--accent-hover);
        }

        .loading {
            display: none;
            text-align: center;
            margin-top: 16px;
        }

        .spinner {
            border: 3px solid rgba(0, 0, 0, 0.06);
            border-top: 3px solid var(--accent);
            border-radius: 50%;
            width: 32px;
            height: 32px;
            animation: spin 0.8s linear infinite;
            margin: 0 auto 12px;
        }

        .loading p {
            font-size: 14px;
            color: var(--text-tertiary);
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        @media (max-width: 768px) {
            .login-card {
                padding: 32px 24px;
            }

            .logo h1 {
                font-size: 24px;
            }

            .logo-icon {
                font-size: 48px;
            }
        }

        @media (max-width: 480px) {
            .login-card {
                padding: 28px 18px;
            }

            .login-card .btn,
            .login-card .btn-primary {
                min-height: 44px;
            }
        }