/* 公共样式 */
:root {
    --primary-color: #f00;
    --text-color: #333;
    --bg-color: #f5f5f5;
    --border-color: #ddd;
}

/* 通用按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 25px;
    border-radius: 5px;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn-primary {
    background: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background: #d00;
    transform: translateY(-2px);
}

.btn-outline {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline:hover {
    background: var(--primary-color);
    color: #fff;
}

/* 通用卡片样式 */
.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    overflow: hidden;
}

/* 通用标题样式 */
.section-title {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
}

/* 通用表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(255,0,0,0.2);
}

/* 通用网格布局 */
.grid {
    display: grid;
    gap: 20px;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* 响应式网格 */
@media screen and (max-width: 992px) {
    .grid-4 {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media screen and (max-width: 768px) {
    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 576px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* 通用动画 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 通用间距 */
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }
.mx-1 { margin-left: 10px; margin-right: 10px; }
.mx-2 { margin-left: 20px; margin-right: 20px; }
.mx-3 { margin-left: 30px; margin-right: 30px; }
.my-1 { margin-top: 10px; margin-bottom: 10px; }
.my-2 { margin-top: 20px; margin-bottom: 20px; }
.my-3 { margin-top: 30px; margin-bottom: 30px; }

.container {
    width: 1200px !important;
    margin: 0 auto !important;
    padding: 0 15px;
    box-sizing: border-box;
    position: relative;
}

/* 响应式布局 */
@media screen and (max-width: 1200px) {
    .container {
        width: 100%;
    }
}