/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

/* 容器样式 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #495057;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.375rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.375rem;
    transition: all 0.15s ease-in-out;
    cursor: pointer;
}

.btn-primary {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
}

.btn-primary:hover {
    color: #fff;
    background-color: #0069d9;
    border-color: #0062cc;
}

.btn-primary:focus {
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.5);
}

/* 链接样式 */
a {
    color: #007bff;
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

a:hover {
    color: #0056b3;
    text-decoration: underline;
}

/* 文本样式 */
.text-center {
    text-align: center !important;
}

.text-muted {
    color: #6c757d !important;
}

.text-danger {
    color: #dc3545 !important;
}

.text-success {
    color: #28a745 !important;
}

/* 间距工具类 */
.mb-2 {
    margin-bottom: 0.5rem !important;
}

.mb-4 {
    margin-bottom: 1.5rem !important;
}

.mt-2 {
    margin-top: 0.5rem !important;
}

.mt-4 {
    margin-top: 1.5rem !important;
}

/* 卡片样式 */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: border-box;
    border: 1px solid rgba(0, 0, 0, 0.125);
    border-radius: 0.375rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.card-body {
    flex: 1 1 auto;
    padding: 1.25rem;
}

.card-title {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    font-weight: 500;
    line-height: 1.2;
}

/* 表单容器 */
.form-container {
    max-width: 500px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

/* 标题样式 */
.page-title {
    margin-bottom: 2rem;
    text-align: center;
    color: #495057;
    font-size: 1.75rem;
    font-weight: 600;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .form-container {
        margin: 1rem;
        padding: 1.5rem;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .btn {
        width: 100%;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0, 123, 255, 0.3);
    border-radius: 50%;
    border-top-color: #007bff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 禁用状态 */
.disabled {
    opacity: 0.65;
    pointer-events: none;
}

/* 辅助类 */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}