:root {
    --bg-window: #1e1e1e;
    --bg-sidebar: #252526;
    --bg-content: #1e1e1e;
    --bg-hover: #2a2d2e;
    --bg-active: #37373d;
    --text-primary: #cccccc;
    --text-secondary: #858585;
    --text-title: #ffffff;
    --border: #3c3c3c;
    --accent: #0078d4;
    --titlebar: #323233;
}

[data-theme="light"] {
    --bg-window: #ffffff;
    --bg-sidebar: #f3f3f3;
    --bg-content: #ffffff;
    --bg-hover: #e8e8e8;
    --bg-active: #d4d4d4;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-title: #1e1e1e;
    --border: #e0e0e0;
    --titlebar: #e8e8e8;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Inter', sans-serif;
    background: var(--bg-window);
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.4;
    overflow: hidden;
    height: 100vh;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    border-radius: 10px;
    overflow: hidden;
}

.titlebar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 38px;
    background: var(--titlebar);
    border-bottom: 1px solid var(--border);
    padding: 0 12px;
    position: relative;
}

.titlebar-logo { display: flex; align-items: center; }
.titlebar-logo img { height: 50px; width: auto; }
.logo-light { display: none; }
.logo-dark { display: block; }
[data-theme="light"] .logo-light { display: block; }
[data-theme="light"] .logo-dark { display: none; }

.titlebar-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.titlebar-search { width: 200px; }
.titlebar-search input {
    width: 100%;
    padding: 5px 10px;
    border: 1px solid var(--border);
    border-radius: 5px;
    background: var(--bg-sidebar);
    color: var(--text-primary);
    font-size: 12px;
    outline: none;
}
.titlebar-search input::placeholder { color: var(--text-secondary); }
.titlebar-search input:focus { background: var(--bg-active); }

.container { display: flex; flex: 1; overflow: hidden; }

.sidebar {
    width: 180px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-nav {
    flex: 1;
    padding: 8px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: 6px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 13px;
    transition: background 0.15s;
    cursor: pointer;
}
.nav-item:hover { background: var(--bg-hover); }
.nav-item.active { background: var(--bg-active); color: var(--text-title); }
.nav-icon { width: 18px; height: 18px; border-radius: 4px; object-fit: cover; flex-shrink: 0; }

.sidebar-footer { padding: 8px; border-top: 1px solid var(--border); }
.theme-btn {
    width: 100%;
    padding: 6px;
    border: none;
    border-radius: 6px;
    background: var(--bg-hover);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
}
.theme-btn:hover { background: var(--bg-active); }

.main { flex: 1; padding: 16px 20px; overflow-y: auto; background: var(--bg-content); }
.category { margin-bottom: 20px; }
.category-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
    padding-left: 4px;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 6px;
    background: var(--bg-sidebar);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 12px;
    transition: all 0.15s;
    border: 1px solid transparent;
}
.link-item:hover { background: var(--bg-hover); border-color: var(--border); transform: translateY(-1px); }
.link-item:active { transform: translateY(0); background: var(--bg-active); }

.link-icon { width: 32px; height: 32px; border-radius: 6px; object-fit: cover; flex-shrink: 0; background: var(--bg-hover); }
.link-info { display: flex; flex-direction: column; gap: 2px; overflow: hidden; }
.link-name { font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.link-desc { font-size: 11px; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.category.hidden, .link-item.hidden { display: none; }
.link-item.highlight { border-color: var(--accent); background: var(--bg-hover); }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-secondary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-primary); }

@media (max-width: 768px) {
    .titlebar {
        height: auto;
        flex-wrap: wrap;
        padding: 8px 12px;
        gap: 8px;
    }
    
    .titlebar-logo {
        order: 1;
    }
    
    .titlebar-logo img {
        height: 32px;
    }
    
    .titlebar-title {
        order: 2;
        position: static;
        transform: none;
        flex: 1;
        text-align: left;
        font-size: 14px;
        font-weight: 600;
    }
    
    .titlebar-search {
        order: 3;
        width: 100%;
        flex-basis: 100%;
    }
    
    .titlebar-search input {
        width: 100%;
        padding: 8px 12px;
        font-size: 14px;
        border-radius: 8px;
    }
    
    .sidebar { width: 50px; }
    .nav-item span:not(.nav-icon) { display: none; }
    .nav-item { justify-content: center; padding: 10px; }
    .links-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
    .main { padding: 12px; }
}

.loading { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100%; color: var(--text-secondary); gap: 16px; }
.loading-spinner { width: 32px; height: 32px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-placeholder { padding: 12px; color: var(--text-secondary); font-size: 12px; text-align: center; }
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100%; color: var(--text-secondary); text-align: center; gap: 8px; }
.empty-state a { color: var(--accent); text-decoration: none; }
.empty-state a:hover { text-decoration: underline; }
.empty-tip { color: var(--text-secondary); font-size: 12px; padding: 20px; text-align: center; }