:root {
    --bg: #FAFAFA;
    --surface: #FFF;
    --surface2: #F4F4F4;
    --text: #111;
    --text2: #6B6B6B;
    --text3: #A3A3A3;
    --border: #E5E5E5;
    --primary: #3B82F6;
    --cardfont:#ffffff;
    --cardbgcolor:#000000;
    --header-h: 65px; /* 由 JS 同步 header 实际高度，保证 tabbar sticky 准确吸顶 */
}
[data-theme="dark"] {
    --bg: #0A0A0A;
    --surface: #141414;
    --surface2: #1F1F1F;
    --text: #F5F5F5;
    --text2: #9A9A9A;
    --text3: #6B6B6B;
    --border: #2A2A2A;
    --primary: #60A5FA;
    --cardfont:#000000;
    --cardbgcolor:#ffffff;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background .3s, color .3s;
    min-height: 100vh;
}
a {
    color: inherit;
    text-decoration: none;
}
button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}
/* 键盘可见焦点 */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: 6px;
}
/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.logo {
    font-size: 20px;
    font-weight: 700;
    white-space: nowrap;
}
.logo span {
    color: var(--primary);
}
.search-wrap {
    flex: 1;
    max-width: 480px;
    position: relative;
}
.search-wrap input {
    width: 100%;
    height: 40px;
    padding: 0 16px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-size: 15px;
    outline: none;
    transition: border-color .2s;
}
.search-wrap input:focus {
    border-color: var(--primary);
}
.search-wrap input::placeholder {
    color: var(--text3);
}
.header-actions {
    display: flex;
    gap: 8px;
    margin-left: auto;
}
.act-btn {
    padding: 8px 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    font-size: 13px;
    color: var(--text2);
    transition: all .15s;
    display: flex;
    align-items: center;
    gap: 6px;
}
.act-btn:hover {
    color: var(--text);
    border-color: var(--text3);
}
.act-btn.active {
    color: var(--primary);
    border-color: var(--primary);
    background: color-mix(in srgb, var(--primary) 12%, transparent);
}
.act-btn svg {
    width: 14px;
    height: 14px;
}
/* Tab Bar */
.tabbar {
    position: sticky;
    top: var(--header-h);
    z-index: 90;
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
}
.tab-scroll {
    flex: 1;
    overflow-x: auto;
    scrollbar-width: none;
    display: flex;
    gap: 4px;
}
.tab-scroll::-webkit-scrollbar {
    display: none;
}
.tab-btn {
    padding: 7px 14px;
    border-radius: 100px;
    font-size: 13px;
    white-space: nowrap;
    color: var(--text2);
    transition: all .15s;
}
.tab-btn:hover {
    background: var(--surface2);
    color: var(--text);
}
.tab-btn.active {
    background: var(--text);
    color: var(--bg);
}
.tab-btn .cnt {
    font-size: 10px;
    opacity: .6;
    margin-left: 3px;
}
.tab-nav {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text2);
    border: 1px solid var(--border);
    flex-shrink: 0;
    transition: all .15s;
}
.tab-nav:hover {
    color: var(--text);
    background: var(--surface2);
}
.tab-nav svg {
    width: 14px;
    height: 14px;
}
/* Main */
.main {
    max-width: 1500px;
    margin: 0 auto;
    padding: 32px 24px 100px;
}
.cat-section {
    margin-bottom: 40px;
}
.cat-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: baseline;
    gap: 8px;
}
.cat-count {
    font-size: 12px;
    color: var(--text3);
    font-weight: 400;
}
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
    transition: all .18s;
    position: relative;
    max-width: 100%;
    /* 注意：不设 overflow:hidden，否则向上弹出的简介 tooltip 会被裁剪；文字省略由内部 .card-name/.card-domain 负责 */
}
.card:hover {
    border-color: var(--text3);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,.06);
}
.card-fav {
    position: absolute;
    top: 8px;
    right: 8px;
    font-size: 14px;
    color: var(--text3);
    padding: 2px 6px;
    border-radius: 4px;
    transition: all .15s;
    z-index: 2;
}
.card-fav:hover {
    color: #F59E0B;
}
.card-fav.on {
    color: #F59E0B;
}
.card-body {
    display: flex;
    align-items: center;
    gap: 10px;
}
.card-icon {
    width: 32px;
    height: 32px;
    background: var(--cardbgcolor);
    color: var(--cardfont);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    border-radius: 17% 83% 5% 95% / 80% 18% 82% 20%;
}
.card-info {
    min-width: 0;
    flex: 1;
}
.card-name {
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.card-domain {
    font-size: 10px;
    color: var(--text3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 2px;
}
/* 搜索关键词高亮 */
.hl {
    color: var(--primary);
    font-weight: 700;
    background: color-mix(in srgb, var(--primary) 14%, transparent);
    border-radius: 3px;
    padding: 0 2px;
}
/* 简介悬浮弹窗（hover / 键盘 focus 时显示） */
.card-desc {
    position: absolute;
    left: 50%;
    bottom: calc(100% + 8px);
    transform: translateX(-50%) translateY(4px);
    width: max-content;
    max-width: 260px;
    background: var(--text);
    color: var(--bg);
    font-size: 12px;
    line-height: 1.5;
    padding: 8px 12px;
    border-radius: 8px;
    box-shadow: 0 6px 20px rgba(0,0,0,.18);
    white-space: normal;
    opacity: 0;
    pointer-events: none;
    transition: opacity .18s, transform .18s;
    z-index: 50;
}
.card-desc::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--text);
}
.card:hover .card-desc,
.card:focus-visible .card-desc,
.card:focus-within .card-desc {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}
/* Empty */
.empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--text3);
}
.empty p {
    font-size: 15px;
}
/* Back top */
.totop {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--text);
    color: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: all .25s;
    z-index: 80;
}
.totop.visible {
    opacity: 1;
    pointer-events: auto;
}
.totop svg {
    width: 18px;
    height: 18px;
}
/* Toast（aria-live） */
.toast {
    position: fixed;
    left: 50%;
    bottom: 32px;
    transform: translateX(-50%) translateY(20px);
    background: var(--text);
    color: var(--bg);
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 14px;
    box-shadow: 0 8px 24px rgba(0,0,0,.2);
    opacity: 0;
    pointer-events: none;
    transition: opacity .25s, transform .25s;
    z-index: 200;
    max-width: 80vw;
}
.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}
.bing_search {
    display: inline-block;
    margin: 20px 10px;
    padding: 10px 20px;
    background: var(--text);
    color: var(--bg);
    border-radius: 5px;
}
/* Mobile：小屏仍保持 sticky 吸顶（不再 top:auto），top 由 --header-h 变量驱动 */
@media (max-width:768px) {
    .header {
        padding: 10px 12px;
    }
    .logo {
        font-size: 17px;
    }
    .search-wrap {
        order: 3;
        max-width: 100%;
        flex-basis: 100%;
    }
    .header-actions {
        margin-left: 0;
    }
    .act-btn {
        padding: 7px 10px;
        font-size: 12px;
    }
    .main {
        padding: 24px 12px 80px;
    }
    .grid {
        grid-template-columns: repeat(auto-fill, minmax(150px,1fr));
        gap: 10px;
    }
    .card {
        padding: 12px;
    }
    .card-name {
        font-size: 13px;
    }
}
@media (max-width:400px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}