/* 全局重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

body {
    min-height: 100vh;
    background: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* 容器样式 */
.container {
    width: 100%;
    max-width: 450px;
    background: #ffffff;
    border-radius: 12px;
    padding: 40px 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid #f0f0f0;
}

/* 标题样式 */
h2 {
    color: #333333;
    text-align: center;
    margin-bottom: 30px;
    font-size: 24px;
    font-weight: 600;
    letter-spacing: 0.3px;
    position: relative;
}

h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 2px;
    background: #e0efff;
    margin: 10px auto 0;
    border-radius: 2px;
}

/* 提示信息样式 */
.info, .error {
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
    font-size: 14px;
}

.info {
    background: #f0f8ff;
    color: #4299e1;
    border: 1px solid #e0efff;
}

.error {
    background: #fff5f5;
    color: #e53e3e;
    border: 1px solid #fed7d7;
}

/* 表单组样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: #666666;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
    background: #ffffff;
    color: #333333;
    font-size: 15px;
    outline: none;
    transition: all 0.3s ease;
}

.form-group input:focus {
    border-color: #94caf8;
    box-shadow: 0 0 0 3px #e0efff;
}

.form-group input::placeholder {
    color: #b3b3b3;
}

/* 登录按钮样式 */
button[type="submit"] {
    width: 100%;
    padding: 14px;
    background: #e0efff;
    color: #4299e1;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

button[type="submit"]:hover {
    background: #d0e8ff;
    color: #3182ce;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(148, 202, 248, 0.2);
}

button[type="submit"]:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(148, 202, 248, 0.15);
}

/* 响应式适配 */
@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
    }
    
    h2 {
        font-size: 22px;
    }
    
    .form-group input {
        padding: 12px 14px;
        font-size: 14px;
    }
    
    button[type="submit"] {
        padding: 12px;
        font-size: 15px;
    }
}

/* 输入框禁用样式（备用） */
input:disabled {
    opacity: 0.8;
    cursor: not-allowed;
    background: #fafafa;
}