/* 关键CSS - 确保页面基本布局在完整CSS加载前可见 */
.category-content {
    display: none !important;
}
.category-content.active {
    display: block !important;
}
.category-button.active {
    background: linear-gradient(135deg, #24C6DC, #514A9D);
    color: white;
    box-shadow: 0 4px 12px rgba(36, 198, 220, 0.2);
}
/* 确保系统工具默认显示 */
#system-content.active {
    display: block !important;
}

/* 从download.html的<style>标签中复制的样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, #f6f9fc 0%, #edf1f7 100%);
    color: #333;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    animation: fadeIn 0.5s ease;
}

header {
    background: linear-gradient(135deg, #24C6DC, #514A9D);
    padding: 20px 0;
    box-shadow: 0 4px 20px rgba(36, 198, 220, 0.2);
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 45%, rgba(255,255,255,0.1) 50%, transparent 55%);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.header-content {
    text-align: center;
}

.header-content h1 {
    color: white;
    font-size: 2.4em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    letter-spacing: 1px;
}

.back-link {
    position: absolute;
    top: 15px;
    left: 15px;
    display: inline-flex;
    align-items: center;
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 8px 15px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 6px;
    font-size: 14px;
    z-index: 1;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.back-link:hover {
    color: #fff;
    transform: translateX(-5px);
    background: rgba(255, 255, 255, 0.25);
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.15);
}

.back-link::before {
    content: '←';
    margin-right: 6px;
    transition: transform 0.3s ease;
    display: inline-block;
    font-size: 14px;
}

.back-link:hover::before {
    transform: translateX(-5px);
}

.category-nav {
    background: white;
    padding: 12px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.category-button {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    background: #f8f9fa;
    color: #514A9D;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 15px;
    white-space: nowrap;
    min-width: 100px;
}

.category-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.software-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.software-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: none;
    min-width: 0;
}

.software-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.software-image {
    width: 100%;
    height: 130px;
    object-fit: contain;
    padding: 12px;
    background: white;
    border-bottom: 1px solid #eee;
}

.software-info {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.software-name {
    font-size: 16px;
    font-weight: 600;
    color: #514A9D;
    margin-bottom: 2px;
}

.software-description {
    color: #666;
    font-size: 13px;
    margin-bottom: 3px;
    height: 55px;
    overflow: hidden;
}

.software-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    color: #888;
    font-size: 12px;
    margin-bottom: 5px;
}

.download-button {
    margin-top: 3px;
    padding: 10px 20px;
    background: linear-gradient(135deg, #24C6DC, #514A9D);
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(36, 198, 220, 0.2);
    text-align: center;
    display: block;
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(36, 198, 220, 0.3);
    background: linear-gradient(135deg, #514A9D, #24C6DC);
}

/* 添加页面加载动画 */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s;
}

.page-loader.hidden {
    opacity: 0;
    pointer-events: none;
}

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

/* 移动端适配 */
@media screen and (max-width: 1200px) {
    .software-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media screen and (max-width: 900px) {
    .software-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 480px) {
    .software-grid {
        grid-template-columns: repeat(1, 1fr);
    }
    .container {
        padding: 10px;
    }
}