* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Microsoft YaHei', sans-serif;
        }

        body {
            background: #f5faf3;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 8px 32px rgba(76, 175, 80, 0.1);
            width: 90%;
            max-width: 500px;
            padding: 2rem;
            position: relative;
            transition: all 0.3s ease;
        }

        .header {
            text-align: center;
            margin-bottom: 2rem;
        }

        .logo {
            width: 80px;
            margin-bottom: 1rem;
        }

        .role-select {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .role-btn {
            padding: 1.2rem;
            border: 2px solid #e0f2e9;
            border-radius: 12px;
            background: none;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 1.1rem;
            color: #2e7d32;
        }

        .role-btn.active {
            background: #e0f2e9;
            border-color: #4CAF50;
        }

        .form-container {
            display: none;
            opacity: 0;
            transform: translateY(10px);
            transition: all 0.3s ease;
        }

        .form-container.active {
            display: block;
            opacity: 1;
            transform: translateY(0);
        }

        .back-btn {
            position: absolute;
            top: 1.5rem;
            left: 1.5rem;
            background: none;
            border: none;
            color: #4CAF50;
            cursor: pointer;
            font-size: 1.2rem;
        }

        .form-title {
            text-align: center;
            color: #2e7d32;
            margin-bottom: 2rem;
        }

        .input-group {
            margin-bottom: 1.5rem;
        }

        input {
            width: 100%;
            padding: 12px;
            border: 2px solid #e0f2e9;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }

        input:focus {
            outline: none;
            border-color: #4CAF50;
        }

        .submit-btn {
            width: 100%;
            padding: 12px;
            background: #4CAF50;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background 0.3s ease;
        }

        .submit-btn:hover {
            background: #45a049;
        }

        .toggle-form {
            text-align: center;
            margin-top: 1.5rem;
            color: #666;
        }

        .toggle-form a {
            color: #4CAF50;
            text-decoration: none;
            cursor: pointer;
        }