/* ==========================
   CSS 变量定义 - 全局颜色和样式
   ========================== */
:root {
    --primary: #0078d4;        /* 主题色：蓝色 */
    --primary-hover: #006cbe;  /* 悬停时的深蓝色 */
    --background: #f5f7fa;     /* 页面背景色：浅灰色 */
    --card-bg: #ffffff;        /* 卡片背景色：白色 */
    --text: #333333;           /* 主要文字颜色 */
    --secondary-text: #666666; /* 次要文字颜色 */
    --border: #e0e5eb;         /* 边框颜色 */
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08); /* 阴影效果 */
    --radius: 8px;             /* 圆角大小 */
    --transition: all 0.3s ease; /* 动画过渡效果 */
}

/* ==========================
   全局样式重置
   ========================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* ==========================
   页面主体样式
   ========================== */
body {
    font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "PingFang SC", sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
}

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

/* ==========================
   页面顶部区域
   ========================== */
header {
    padding: 30px 0;
    text-align: center;
    position: relative;
}

/* 语言切换按钮区域 */
.language-switch {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 8px;
    z-index: 100;
}

/* 语言切换按钮样式 */
.language-btn {
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background-color: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
}

/* 激活状态的语言按钮 */
.language-btn.active {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* 鼠标悬停在未激活的按钮上 */
.language-btn:hover:not(.active) {
    background-color: var(--border);
}

h1 {
    color: var(--primary);
    font-size: 2.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--secondary-text);
    font-size: 1.1rem;
    margin-bottom: 20px;
}

/* ==========================
   搜索框区域
   ========================== */
.search-container {
    margin: 20px auto 30px;
    max-width: 600px;
    position: relative;
}

.search-box {
    width: 100%;
    padding: 14px 20px 14px 50px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    font-size: 16px;
    background-color: var(--card-bg);
    transition: var(--transition);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.search-box:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 120, 212, 0.2);
    border-color: var(--primary);
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    fill: var(--secondary-text);
}

/* ==========================
   主分类导航按钮
   ========================== */
.main-category {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.category-btn {
    padding: 10px 24px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background-color: var(--card-bg);
    color: var(--text);
    font-size: 15px;
    cursor: pointer;
    transition: var(--transition);
}

.category-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.category-btn.active {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ==========================
   内容区域网格布局
   ========================== */
.content-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

/* ==========================
   设备型号卡片样式
   ========================== */
.device-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    transition: var(--transition);
    border: 1px solid var(--border);
    animation: fadeIn 0.5s ease-out;
    animation-fill-mode: both;
}

.device-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* 卡片标题 */
.device-card h2 {
    color: var(--primary);
    font-size: 1.3rem;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
    display: flex;
    align-items: center;
}

/* 卡片图标 */
.card-icon {
    margin-right: 10px;
    width: 24px;
    height: 24px;
    fill: var(--primary);
}

/* 设备图片 */
.device-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 16px;
    background: var(--background);
}

/* 设备信息 */
.device-info {
    margin-bottom: 16px;
    padding: 10px;
    background: var(--background);
    border-radius: 6px;
    font-size: 14px;
    color: var(--secondary-text);
}

/* 固件项目 */
.firmware-item {
    margin: 12px 0;
}

.firmware-title {
    font-size: 14px;
    color: var(--text);
    margin-bottom: 6px;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.version-tag {
    display: inline-block;
    padding: 2px 8px;
    background: var(--primary);
    color: white;
    border-radius: 4px;
    font-size: 12px;
    margin-left: 8px;
    white-space: nowrap;
}

/* ==========================
   下载按钮样式
   ========================== */
.download-link {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    background-color: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    transition: var(--transition);
    font-size: 15px;
    width: 100%;
    border: none;
    cursor: pointer;
}

.download-link:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.download-icon {
    width: 16px;
    height: 16px;
    margin-right: 8px;
    fill: white;
}

/* 历史版本按钮 */
.history-btn {
    background-color: var(--background);
    color: var(--primary);
    border: 2px solid var(--border);
    margin-top: 8px;
}

.history-btn:hover {
    background-color: var(--border);
    transform: translateY(-2px);
}

.history-btn .download-icon {
    fill: var(--primary);
}

/* 历史版本列表 */
.history-versions {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--border);
    display: none;
}

.history-versions.show {
    display: block;
}

.history-item {
    margin: 8px 0;
}

/* 查看所有文件按钮 */
.view-all-btn {
    background-color: #6c757d;
    margin-top: 8px;
}

.view-all-btn:hover {
    background-color: #5a6268;
}

/* ==========================
   模态框/弹窗样式
   ========================== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 9998;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.show {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease;
    position: relative;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 24px;
    border-bottom: 2px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    color: var(--primary);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--secondary-text);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--border);
    color: var(--text);
}

.modal-body {
    padding: 24px;
}

.modal-device-image {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 20px;
}

.modal-section {
    margin-bottom: 24px;
}

.modal-section h3 {
    color: var(--primary);
    font-size: 1.2rem;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.modal-firmware-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ==========================
   空状态提示
   ========================== */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--secondary-text);
}

.empty-state h3 {
    font-size: 1.5em;
    margin-bottom: 10px;
    color: var(--text);
}

/* ==========================
   页脚样式
   ========================== */
footer {
    margin-top: 50px;
    text-align: center;
    padding: 20px;
    color: var(--secondary-text);
    font-size: 14px;
}

footer p {
    margin: 5px 0;
}

/* ==========================
   动画效果
   ========================== */
@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(10px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* ==========================
   下载通知提示框
   ========================== */
.download-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    border-radius: var(--radius);
    color: white;
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 9999;
    animation: slideIn 0.3s ease;
}

.download-notification.success {
    background: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%);
}

.download-notification.fade-out {
    animation: fadeOut 0.3s ease;
    opacity: 0;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

/* ==========================
   响应式设计 - 平板设备
   ========================== */
@media (max-width: 768px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .main-category {
        gap: 8px;
    }
    
    .category-btn {
        padding: 8px 16px;
        font-size: 14px;
    }
    
    header {
        padding: 20px 0;
    }
    
    .device-card {
        padding: 20px;
    }
    
    /* 移动端语言切换按钮改为相对定位，在标题下方居中显示 */
    .language-switch {
        position: relative;
        top: auto;
        right: auto;
        justify-content: center;
        margin-bottom: 20px;
    }
}

/* ==========================
   响应式设计 - 手机设备
   ========================== */
@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .main-category {
        flex-direction: column;
    }
    
    .category-btn {
        width: 100%;
    }
    
    .modal-content {
        max-height: 95vh;
    }
    
    .modal-header {
        padding: 16px;
    }
    
    .modal-body {
        padding: 16px;
    }
}