:root {
    --uv-primary: #1a5fb4;
    --uv-primary-dark: #0d3d7a;
    --uv-bg: #eef2f7;
    --uv-card: #ffffff;
    --uv-border: #dbe3ef;
    --uv-muted: #5c6370;
    --uv-active: #e8f1fc;
}

* { box-sizing: border-box; }

body.uv-page {
    margin: 0;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--uv-bg);
    color: #1c1c1e;
}

.uv-topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--uv-border);
    backdrop-filter: blur(8px);
}

.uv-topbar-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.uv-brand {
    color: var(--uv-primary);
    text-decoration: none;
    font-weight: 700;
    white-space: nowrap;
}

.uv-meta {
    flex: 1;
    font-size: 13px;
    color: var(--uv-muted);
}

.uv-btn {
    padding: 8px 14px;
    border-radius: 8px;
    background: var(--uv-primary);
    color: #fff;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
}

.uv-layout {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px;
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 16px;
    min-height: calc(100vh - 56px);
}

@media (max-width: 960px) {
    .uv-layout { grid-template-columns: 1fr; }
    .uv-sidebar { max-height: 320px; }
}

.uv-sidebar {
    background: var(--uv-card);
    border: 1px solid var(--uv-border);
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.uv-sidebar-head {
    padding: 16px 16px 10px;
    border-bottom: 1px solid var(--uv-border);
}

.uv-sidebar-head h1 {
    margin: 0 0 4px;
    font-size: 18px;
    color: var(--uv-primary-dark);
}

.uv-sidebar-head p {
    margin: 0;
    font-size: 12px;
    color: var(--uv-muted);
}

.uv-list {
    overflow-y: auto;
    flex: 1;
}

.uv-item {
    display: block;
    width: 100%;
    border: none;
    border-bottom: 1px solid var(--uv-border);
    background: transparent;
    text-align: left;
    padding: 12px 14px;
    cursor: pointer;
    transition: background 0.15s;
}

.uv-item:hover { background: #f8fafc; }

.uv-item.active {
    background: var(--uv-active);
    border-left: 3px solid var(--uv-primary);
    padding-left: 11px;
}

.uv-item-index {
    display: inline-block;
    min-width: 22px;
    font-size: 11px;
    color: var(--uv-muted);
    margin-right: 6px;
}

.uv-item-title {
    display: block;
    font-size: 13px;
    line-height: 1.45;
    color: #1c1c1e;
}

.uv-item-meta {
    display: flex;
    gap: 8px;
    margin-top: 6px;
    font-size: 11px;
    color: var(--uv-muted);
}

.uv-item-tag {
    background: #f1f5f9;
    padding: 1px 6px;
    border-radius: 4px;
}

.uv-player-panel {
    background: var(--uv-card);
    border: 1px solid var(--uv-border);
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.uv-player-head {
    padding: 16px 18px 10px;
    border-bottom: 1px solid var(--uv-border);
}

.uv-player-head h2 {
    margin: 0 0 6px;
    font-size: 17px;
    line-height: 1.4;
}

.uv-player-meta {
    font-size: 12px;
    color: var(--uv-muted);
}

.uv-player-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #0f172a;
}

.uv-player-wrap iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.uv-player-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    gap: 8px;
}

.uv-player-placeholder i { font-size: 48px; }

.uv-player-foot {
    padding: 12px 18px 16px;
    font-size: 13px;
    color: var(--uv-muted);
}

.uv-player-foot a {
    color: var(--uv-primary);
}