:root {
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --border-hover: #9ca3af;
    --accent-color: #0ea5e9;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --tag-bg: #f3f4f6;
    --tag-text: #4b5563;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* 工程师克制风格 Header */
.site-header-wrapper {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}
header {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
header h1 { 
    font-size: 1.25rem; 
    font-weight: 600; 
    color: var(--text-main);
    letter-spacing: -0.025em;
}
header p { 
    font-size: 0.875rem; 
    color: var(--text-muted); 
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* 主体内容 */
main {
    flex: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem;
}

/* 工具卡片 - Github/Vercel 风格 */
.tool-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    cursor: pointer;
}
.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--border-hover);
}

/* 卡片信息排版 */
.tool-header {
    display: flex;
    align-items: center;
    margin-bottom: 0.75rem;
    gap: 0.75rem;
}
.tool-icon {
    font-size: 1.125rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    filter: grayscale(0.2);
}
.tool-title {
    font-size: 1rem;
    font-weight: 600;
}

/* 描述：克制，限高或两行省略 */
.tool-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
    flex-grow: 1;
    margin-bottom: 1.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 底部 Meta：标签 + 状态信息 */
.tool-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px dashed var(--border-color);
    padding-top: 0.75rem;
}
.tool-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.tool-tag {
    background-color: var(--tag-bg);
    color: var(--tag-text);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}
.tool-version {
    font-size: 0.725rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    color: var(--border-hover);
}

/* Footer 同样克制 */
footer {
    padding: 2.5rem 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
    text-align: center;
    background-color: var(--bg-color);
}
footer .record-info { 
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}
footer .record-info a {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}
footer .record-info img {
    height: 14px;
    width: auto;
    filter: grayscale(100%);
    opacity: 0.5;
    transition: all 0.2s;
}
footer .record-info a:hover { color: var(--text-main); }
footer .record-info a:hover img { filter: grayscale(0%); opacity: 1; }