/* ========== 主题变量 ========== */
:root, [data-theme="dark"] {
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e293b;
    --header-bg: rgba(15, 23, 42, 0.8);
    --nav-bg: rgba(15, 23, 42, 0.7);
    --card-bg: rgba(30, 41, 59, 0.6);
    --card-bg-hover: rgba(30, 41, 59, 0.9);
    --input-bg: rgba(30, 41, 59, 0.8);
    --tab-bg: rgba(30, 41, 59, 0.6);
    --border-color: rgba(148, 163, 184, 0.15);
    --border-hover: rgba(96, 165, 250, 0.3);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-title: #f8fafc;
    --text-muted: #64748b;
    --text-version: #475569;
    --tag-bg: rgba(96, 165, 250, 0.1);
    --tag-color: #60a5fa;
    --icon-bg: rgba(96, 165, 250, 0.1);
    --accent-start: #3b82f6;
    --accent-end: #8b5cf6;
    --accent-text-start: #60a5fa;
    --accent-text-end: #a78bfa;
    --shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
    --modal-mask: rgba(0, 0, 0, 0.6);
    --skeleton-from: rgba(30,41,59,0.6);
    --skeleton-mid: rgba(51,65,85,0.6);
    --skeleton-to: rgba(30,41,59,0.6);
}

[data-theme="light"] {
    --bg-gradient-start: #f8fafc;
    --bg-gradient-end: #e2e8f0;
    --header-bg: rgba(255, 255, 255, 0.85);
    --nav-bg: rgba(255, 255, 255, 0.85);
    --card-bg: rgba(255, 255, 255, 0.9);
    --card-bg-hover: #ffffff;
    --input-bg: rgba(255, 255, 255, 0.9);
    --tab-bg: rgba(241, 245, 249, 0.8);
    --border-color: rgba(100, 116, 139, 0.15);
    --border-hover: rgba(59, 130, 246, 0.4);
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-title: #1e293b;
    --text-muted: #94a3b8;
    --text-version: #cbd5e1;
    --tag-bg: rgba(59, 130, 246, 0.08);
    --tag-color: #2563eb;
    --icon-bg: rgba(59, 130, 246, 0.1);
    --accent-start: #3b82f6;
    --accent-end: #8b5cf6;
    --accent-text-start: #3b82f6;
    --accent-text-end: #7c3aed;
    --shadow: 0 8px 30px rgba(15, 23, 42, 0.08);
    --modal-mask: rgba(15, 23, 42, 0.5);
    --skeleton-from: rgba(241,245,249,0.8);
    --skeleton-mid: rgba(226,232,240,0.9);
    --skeleton-to: rgba(241,245,249,0.8);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
}

/* 顶部导航 */
.header {
    position: sticky; top: 0; z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
}
.header-content {
    max-width: 1400px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
}
.site-title {
    font-size: 24px; font-weight: 700;
    background: linear-gradient(90deg, var(--accent-text-start), var(--accent-text-end));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    white-space: nowrap;
    display: flex; align-items: center; gap: 10px;
}
.site-logo {
    width: 38px; height: 38px;
    border-radius: 50%;
    -webkit-text-fill-color: initial; /* 覆盖渐变透明，保持logo原图颜色 */
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}
.header-slogan {
    font-size: 20px;
    font-weight: 600;
    background: linear-gradient(90deg, #22d3ee, #60a5fa, #a78bfa);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    text-align: center;
    line-height: 1.2;
    white-space: nowrap;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}
/* 移动端（小于768px）隐藏推广语，避免挤压顶栏 */
@media (max-width: 768px) {
    .header-slogan {
        display: none;
    }
    .site-title {
        font-size: 20px;
    }
    .site-logo {
        width: 32px; height: 32px;
    }
    .header-date {
        display: none; /* 小屏幕隐藏日期，节省空间 */
    }
}

.header-date {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    padding: 6px 12px;
    border-radius: 8px;
    background: var(--tab-bg);
    border: 1px solid var(--border-color);
}
.header-actions { 
    display: flex; 
    gap: 10px; 
    flex-shrink: 0;
    align-items: center;
}
.icon-btn {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    background: var(--tab-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer; text-decoration: none;
    transition: all 0.2s ease;
}
.icon-btn:hover {
    background: var(--tag-bg);
    border-color: var(--border-hover);
    color: var(--tag-color);
}
/* 主题按钮内两个图标根据 data-theme 显隐 */
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="dark"] .theme-icon-dark { display: block; }
[data-theme="light"] .theme-icon-dark { display: none; }
[data-theme="light"] .theme-icon-light { display: block; }

/* 搜索栏：单独一行 */
.search-bar {
    position: sticky; top: 73px; z-index: 99;
    background: var(--header-bg);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 24px;
}
.search-bar-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}
.search-box {
    flex: 1;
    min-width: 280px;
    position: relative;
}
.search-box input {
    width: 100%;
    padding: 12px 16px 12px 48px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 15px;
    transition: all 0.3s ease;
}
.search-box input:focus {
    outline: none;
    border-color: var(--tag-color);
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.15);
}
.search-box input::placeholder { color: var(--text-secondary); }
.search-icon {
    position: absolute; left: 16px; top: 14px;
    color: var(--text-secondary);
}
.access-filter-group {
    display: flex; gap: 8px;
    flex-shrink: 0;
}
.filter-btn {
    padding: 10px 18px;
    background: var(--tab-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    cursor: pointer;
    transition: all 0.2s ease;
}
.filter-btn:hover {
    background: var(--tag-bg);
    border-color: var(--border-hover);
    color: var(--tag-color);
}
.filter-btn.active {
    background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
    border-color: transparent;
    color: white;
}

/* 分类导航 */
.category-nav {
    position: sticky; top: 133px; z-index: 98;
    background: var(--nav-bg);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    padding: 12px 24px;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto; scrollbar-width: none;
}
.category-nav::-webkit-scrollbar { display: none; }
.category-tabs {
    max-width: 1400px; margin: 0 auto;
    display: flex; gap: 8px;
}
.category-tab {
    padding: 8px 16px;
    background: var(--tab-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 14px; white-space: nowrap;
    cursor: pointer;
    transition: all 0.2s ease;
}
.category-tab:hover {
    background: var(--tag-bg);
    border-color: var(--border-hover);
    color: var(--tag-color);
}
.category-tab.active {
    background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
    border-color: transparent;
    color: white; font-weight: 500;
}

/* 主内容 */
.main-content { max-width: 1400px; margin: 0 auto; padding: 24px; }
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

/* 工具卡片 */
.tool-card {
    position: relative; display: block;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px; padding: 20px;
    text-decoration: none; color: inherit;
    transition: all 0.3s ease;
    overflow: hidden; cursor: pointer;
}
.tool-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
    opacity: 0; transition: opacity 0.3s ease;
}
.tool-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow);
    background: var(--card-bg-hover);
}
.tool-card:hover::before { opacity: 1; }
.tool-card .detail-hint {
    position: absolute; right: 14px; bottom: 12px;
    font-size: 11px; color: var(--text-muted);
    opacity: 0; transition: opacity 0.2s;
}
.tool-card:hover .detail-hint { opacity: 1; }

.tool-header {
    display: flex; align-items: flex-start; gap: 12px;
    margin-bottom: 12px;
}
.tool-icon {
    width: 48px; height: 48px; border-radius: 12px;
    background: var(--icon-bg);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; flex-shrink: 0; object-fit: contain;
    color: var(--tag-color);
    font-weight: 600;
}
.tool-icon img {
    width: 32px; height: 32px; object-fit: contain;
}
[data-theme="dark"] .tool-icon img {
    background: #ffffff;
    border-radius: 8px;
    padding: 2px;
}
.tool-info { flex: 1; min-width: 0; }
.tool-name {
    font-size: 18px; font-weight: 600;
    color: var(--text-title);
    margin-bottom: 4px;
    display: flex; align-items: center; gap: 8px;
}
.hot-badge {
    font-size: 11px; padding: 2px 6px;
    background: linear-gradient(90deg, #ef4444, #f97316);
    border-radius: 4px; color: white; font-weight: 500;
}
.tool-desc {
    font-size: 14px; color: var(--text-secondary);
    line-height: 1.5; margin-bottom: 12px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.tool-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
    font-size: 12px; padding: 3px 8px;
    background: var(--tag-bg); border-radius: 6px;
    color: var(--tag-color);
}

/* 骨架屏 */
.skeleton-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.skeleton-card {
    height: 160px;
    background: linear-gradient(90deg, var(--skeleton-from) 25%, var(--skeleton-mid) 50%, var(--skeleton-to) 75%);
    background-size: 200% 100%;
    border-radius: 16px;
    animation: skeleton-loading 1.5s infinite;
}
@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.empty-state {
    text-align: center; padding: 80px 20px;
    color: var(--text-secondary); font-size: 18px;
}

/* 页脚 */
.footer {
    text-align: center; padding: 40px 24px;
    color: var(--text-muted); font-size: 14px;
    border-top: 1px solid var(--border-color); margin-top: 40px;
}
.footer .data-version {
    margin-top: 8px; font-size: 12px; color: var(--text-version);
}

/* ========== 工具详情弹窗 ========== */
.modal-mask {
    position: fixed; inset: 0; z-index: 1000;
    background: var(--modal-mask);
    backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
    display: flex; align-items: center; justify-content: center;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}
.modal-card {
    position: relative;
    width: 100%; max-width: 560px;
    background: var(--card-bg-hover);
    border: 1px solid var(--border-color);
    border-radius: 20px; padding: 32px;
    box-shadow: var(--shadow);
    animation: slideUp 0.25s ease;
    max-height: 90vh; overflow-y: auto;
}
.modal-close {
    position: absolute; top: 14px; right: 16px;
    width: 32px; height: 32px; border-radius: 50%;
    background: transparent; border: none;
    font-size: 24px; line-height: 1; color: var(--text-muted);
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    transition: all 0.2s;
}
.modal-close:hover { background: var(--tag-bg); color: var(--tag-color); }

.modal-header { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 20px; }
.modal-icon {
    width: 64px; height: 64px; border-radius: 14px;
    background: var(--icon-bg);
    display: flex; align-items: center; justify-content: center;
    font-size: 30px; flex-shrink: 0; object-fit: contain;
    color: var(--tag-color); font-weight: 600;
}
.modal-title-wrap { flex: 1; min-width: 0; }
.modal-title {
    font-size: 22px; font-weight: 700; color: var(--text-title);
    display: flex; align-items: center; gap: 10px; margin-bottom: 6px;
    word-break: break-all;
}
.modal-category {
    font-size: 13px; color: var(--text-secondary);
}
.modal-desc {
    font-size: 15px; color: var(--text-primary);
    line-height: 1.7; margin-bottom: 18px;
    padding: 16px; border-radius: 12px;
    background: var(--tab-bg); border: 1px solid var(--border-color);
}
.modal-section { margin-bottom: 16px; }
.modal-section-label {
    font-size: 12px; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.5px;
    margin-bottom: 8px; font-weight: 600;
}
.modal-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.modal-tags .tag { font-size: 13px; padding: 5px 10px; }
.modal-url {
    font-size: 13px; color: var(--tag-color);
    word-break: break-all; font-family: ui-monospace, monospace;
    padding: 10px 12px; border-radius: 8px;
    background: var(--tab-bg); border: 1px solid var(--border-color);
}
.modal-actions { margin-top: 24px; display: flex; gap: 12px; }
.btn-primary {
    flex: 1; padding: 12px 20px;
    background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
    color: white; border: none; border-radius: 12px;
    font-size: 15px; font-weight: 500; cursor: pointer;
    text-decoration: none; text-align: center;
    transition: all 0.2s;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(59,130,246,0.3); }
.btn-ghost {
    padding: 12px 20px;
    background: var(--tab-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border-color); border-radius: 12px;
    font-size: 15px; cursor: pointer;
    transition: all 0.2s;
}
.btn-ghost:hover { background: var(--tag-bg); color: var(--tag-color); border-color: var(--border-hover); }

/* 可访问性徽章 */
.tool-name-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.access-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 500;
    line-height: 1.6;
}
.access-badge.cn-direct {
    background: rgba(34, 197, 94, 0.12);
    color: #22c55e;
    border: 1px solid rgba(34, 197, 94, 0.2);
}
.access-badge.overseas {
    background: rgba(231, 76, 60, 0.1);
    color: #e74c3c;
    border: 1px solid rgba(231, 76, 60, 0.2);
}

/* 分类Tab分割线 */
.tab-divider {
    width: 1px;
    height: 20px;
    background: var(--border-color);
    margin: 0 4px;
    flex-shrink: 0;
    align-self: center;
}
.cn-tab { color: var(--success, #22c55e); }
.os-tab { color: var(--danger, #e74c3c); }

/* 弹窗按钮 */
.btn-secondary {
    transition: all 0.2s;
}
.btn-secondary:hover {
    background: var(--card-bg-hover) !important;
}

/* 境外站点提示弹窗：固定暗色主题，不受全局明暗主题切换影响 */
.modal-mask-dark {
    background: rgba(0, 0, 0, 0.7);
}
.modal-card-dark {
    background: #1e293b;
    border: 1px solid rgba(148, 163, 184, 0.2);
    color: #f1f5f9;
}
.modal-card-dark h3 {
    color: #f8fafc;
}
.modal-card-dark .modal-close {
    color: #94a3b8;
}
.modal-card-dark .modal-close:hover {
    background: rgba(99, 102, 241, 0.15);
    color: #a78bfa;
}

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

/* 响应式 */
@media (max-width: 768px) {
    .header { padding: 12px 16px; }
    .header-content { align-items: center; }
    .header-actions { gap: 8px; }
    .site-title { font-size: 20px; white-space: nowrap; }
    .header-date { font-size: 12px; padding: 5px 10px; }
    
    /* 搜索栏移动端：搜索框占满一行，筛选按钮居中在下一行 */
    .search-bar { top: 65px; padding: 10px 16px; }
    .search-bar-content {
        gap: 10px;
    }
    .search-box {
        width: 100%;
        min-width: 100%;
    }
    .search-box input {
        padding-left: 44px;
        font-size: 14px;
    }
    .search-icon {
        left: 14px;
        top: 12px;
        width: 18px;
        height: 18px;
    }
    .access-filter-group {
        width: 100%;
        justify-content: center;
    }
    .filter-btn {
        flex: 1;
        max-width: 160px;
        padding: 8px 10px;
        font-size: 13px;
    }
    
    .category-nav { top: 136px; padding: 10px 16px; }
    .tools-grid, .skeleton-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .tool-card { padding: 16px; }
    .tool-icon { width: 40px; height: 40px; font-size: 20px; border-radius: 10px; }
    .tool-name { font-size: 16px; }
    .tool-desc { font-size: 13px; }
    .modal-card { padding: 24px 20px; border-radius: 16px; }
    .modal-icon { width: 52px; height: 52px; font-size: 24px; border-radius: 12px; }
    .modal-title { font-size: 18px; }
}

@media (max-width: 480px) {
    .header-date { display: none; }
    .icon-btn { width: 36px; height: 36px; }
    .icon-btn svg { width: 18px; height: 18px; }
    .tools-grid, .skeleton-grid { grid-template-columns: 1fr; }
    .modal-actions { flex-direction: column; }
    .filter-btn {
        font-size: 12px;
        padding: 7px 8px;
    }
}