/* css/style.css */

/* --- 全局变量与基础重置 --- */
:root {
    --primary-color: #2563eb;
    --primary-hover-color: #1d4ed8;
    --text-color: #1f2937;
    --light-text-color: #f9fafb;
    --bg-color: #ffffff;
    --secondary-bg-color: #fafbfc;
    --border-color: #e5e7eb;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --card-shadow-hover: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --border-radius: 12px;
    --border-radius-sm: 8px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--secondary-bg-color);
    color: var(--text-color);
    overflow-x: hidden;
    max-width: 100vw;
}

/* --- 可访问性辅助类 --- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- 主要布局 --- */
.site-header, .site-footer {
    text-align: center;
    padding: 1rem 1rem;
    background-color: var(--bg-color);
}

.site-header {
    border-bottom: none;
    background: linear-gradient(135deg, #111827, #1f2937);
    color: white;
    padding: 3rem 1rem 2rem;
    position: relative;
    overflow: hidden;
}

.site-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.site-header h1 {
    font-size: 2.5em;
    font-weight: 700;
    color: white;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.site-header p {
    color: #d1d5db;
    font-size: 1.2em;
    position: relative;
    z-index: 1;
}

.site-footer {
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9em;
    color: #6c757d;
}

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem;
}

/* --- 过滤与搜索控件 --- */
.filter-nav {
    background-color: white;
    padding: 0.5rem 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    border-bottom: 1px solid var(--border-color);
}

/* 工具列表容器最小高度 */
.tool-list-container {
    min-height: 60vh;
}

.filter-controls {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-wrap: nowrap;
    gap: 1rem;
    align-items: center;
    width: 100%;
}

.category-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem 0;
    width: 100%;
    max-width: 100%;
}

/* 移动端保持横向滑动 */
@media (max-width: 767px) {
    .category-buttons {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
}

.category-buttons::-webkit-scrollbar {
    display: none;
}

.category-btn {
    padding: 0.6rem 1.2rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--primary-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    font-weight: 500;
    white-space: nowrap;
}

.category-btn:hover {
    background-color: var(--primary-color);
    color: var(--light-text-color);
}

.category-btn.active {
    background-color: var(--primary-color);
    color: var(--light-text-color);
    font-weight: 600;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
    transform: translateY(-1px);
}

.category-btn:focus { /* 键盘聚焦状态，提升可访问性 */
    outline: 2px solid var(--primary-hover-color);
    outline-offset: 2px;
}

.search-container {
    flex-grow: 0;
    flex-shrink: 1;
    min-width: 250px;
    max-width: 400px;
}

#search-box {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1em;
}

/* --- 工具列表与卡片 --- */
.tool-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* 直接列出工具时的样式 */
.tool-list--flat {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.tool-card {
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-decoration: none; /* 移除a标签的下划线 */
    color: inherit;
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow-hover);
}

.tool-card:focus { /* 键盘聚焦状态 */
    outline: 2px solid var(--primary-hover-color);
    outline-offset: 4px;
}

.tool-card-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1; /* 让内容区填满卡片剩余空间 */
    gap: 0.75rem;
}

.tool-card-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0;
}

.tool-logo {
    width: 50px;
    height: 50px;
    object-fit: contain;
    border-radius: 4px;
    flex-shrink: 0;
}

.tool-logo-default {
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover-color));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1.0em;
    flex-shrink: 0;
}

.tool-name {
    font-size: 1.2em;
    font-weight: bold;
}

.tool-description {
    font-size: 0.95em;
    color: #a3a5a8;
    flex-grow: 1; /* 确保描述占据可用空间，使得卡片在网格中高度一致 */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.5;
    max-height: 3em; /* 2行的高度 */
}

/* 隐藏元素的辅助类 */
.hidden {
    display: none !important;
}

/* 状态信息样式 */
.status-message {
    grid-column: 1 / -1; /* 让信息横跨所有列 */
    text-align: center;
    padding: 2rem;
    font-size: 1.2em;
    color: #6c757d;
}

/* 分类分组样式 */
.category-section {
    margin-bottom: 1rem;
}

.category-title {
    font-size: 1.5em;
    font-weight: bold;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-color);
}

/* 子分类内的工具列表横向排列 */
.category-section .tool-list {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* --- 响应式布局 (Media Queries) --- */

/* Breakpoint 2: Tablet (768px - 1199px) - PRD要求2或3列 */
@media (max-width: 1199px) {
    .tool-list--flat {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }
    
    .category-section .tool-list {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }
}

/* Breakpoint 1: Mobile (< 768px) - PRD要求单列 */
@media (max-width: 767px) {
    .filter-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem; /* 缩小移动端搜索栏和导航栏的间距 */
    }
    
    .category-buttons {
        margin: 0 -1rem;
        padding: 0.5rem 1rem;
        width: calc(100% + 2rem);
    }
    
    .search-container {
        max-width: 100%;
        min-width: auto;
    }

    .tool-list--flat {
        grid-template-columns: 1fr; /* 单列布局 */
    }
    
    .category-section .tool-list {
        grid-template-columns: 1fr; /* 子分类内单列布局 */
    }

    .site-header {
        padding: 1rem 1rem 1rem;
    }

    .site-header h1 {
        font-size: 2em;
    }
}