.uo-product-tabs {
    width: min(100%, 1120px);
    margin: 0 auto 34px;
}

.uo-product-tablist {
    display: flex;
    width: fit-content;
    max-width: 100%;
    gap: 4px;
    padding: 5px;
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    background: var(--bg-card);
    box-shadow: 0 12px 32px rgba(8, 14, 28, 0.1);
}

.uo-product-tab {
    min-height: 42px;
    padding: 0 18px;
    border: 1px solid transparent;
    border-radius: 10px;
    background: transparent;
    color: var(--text-secondary);
    font: inherit;
    font-size: 0.88rem;
    font-weight: 620;
    cursor: pointer;
    transition: color 160ms ease, background 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.uo-product-tab:hover { color: var(--text-primary); }

.uo-product-tab.is-active {
    border-color: var(--border-subtle);
    background: var(--bg-base);
    color: var(--text-primary);
    box-shadow: 0 4px 14px rgba(8, 14, 28, 0.12);
}

.uo-product-tab:focus-visible,
.uo-changelog-retry:focus-visible {
    outline: 2px solid #8b7bff;
    outline-offset: 3px;
}

.uo-product-tab-panel[hidden] { display: none !important; }

.uo-changelog-panel {
    max-width: 1120px;
    margin: 0 auto;
    color: var(--text-primary);
}

.uo-changelog-intro {
    position: relative;
    margin: 18px 0 30px;
    padding: clamp(22px, 4vw, 38px);
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    background:
        radial-gradient(ellipse at 92% 0%, rgba(132, 111, 255, 0.14), transparent 44%),
        var(--bg-card);
    box-shadow: 0 20px 52px rgba(8, 14, 28, 0.12);
}

.uo-changelog-kicker {
    display: inline-flex;
    margin-bottom: 10px;
    color: #8b7bff;
    font-size: 0.68rem;
    font-weight: 750;
    letter-spacing: 0.17em;
}

.uo-changelog-intro h2 {
    margin: 0;
    color: var(--text-primary);
    font-family: var(--font-display, inherit);
    font-size: clamp(1.6rem, 3.5vw, 2.25rem);
    letter-spacing: -0.035em;
}

.uo-changelog-intro p {
    max-width: 660px;
    margin: 10px 0 0;
    color: var(--text-secondary);
    font-size: 0.96rem;
    line-height: 1.7;
}

.uo-changelog-content {
    display: grid;
    gap: 18px;
}

.uo-changelog-document-title {
    margin: 0 0 2px;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 650;
    letter-spacing: -0.015em;
}

.uo-changelog-release {
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    border-radius: 18px;
    background: var(--bg-card);
    box-shadow: 0 12px 34px rgba(8, 14, 28, 0.08);
}

.uo-changelog-release > header {
    padding: 19px 24px;
    border-bottom: 1px solid var(--border-subtle);
    background: linear-gradient(110deg, rgba(132, 111, 255, 0.1), transparent 76%);
}

.uo-changelog-release > header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.08rem;
    font-weight: 700;
    line-height: 1.5;
}

.uo-changelog-release-body {
    padding: 8px 24px 22px;
}

.uo-changelog-release-body h4,
.uo-changelog-release-body h5,
.uo-changelog-release-body h6 {
    margin: 21px 0 8px;
    color: var(--text-primary);
    font-size: 0.92rem;
    font-weight: 680;
    line-height: 1.55;
}

.uo-changelog-release-body p {
    margin: 12px 0;
    color: var(--text-secondary);
    line-height: 1.75;
}

.uo-changelog-release-body ul {
    display: grid;
    gap: 8px;
    margin: 8px 0 14px;
    padding-inline-start: 22px;
    color: var(--text-secondary);
}

.uo-changelog-release-body li {
    padding-inline-start: 3px;
    line-height: 1.72;
}

.uo-changelog-release-body li::marker { color: #8b7bff; }

.uo-changelog-release-body li.uo-changelog-nested-item {
    margin-inline-start: 18px;
    color: var(--text-muted);
    font-size: 0.94em;
}

.uo-changelog-release-body strong { color: var(--text-primary); font-weight: 660; }

.uo-changelog-release-body code {
    padding: 0.12em 0.42em;
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    background: var(--bg-base);
    color: var(--text-primary);
    font-size: 0.88em;
}

.uo-changelog-release-body hr {
    height: 1px;
    margin: 18px 0;
    border: 0;
    background: var(--border-subtle);
}

.uo-changelog-loading,
.uo-changelog-error {
    display: flex;
    min-height: 150px;
    align-items: center;
    justify-content: center;
    gap: 12px;
    border: 1px solid var(--border-subtle);
    border-radius: 18px;
    background: var(--bg-card);
    color: var(--text-secondary);
}

.uo-changelog-loading span {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-subtle);
    border-top-color: #8b7bff;
    border-radius: 50%;
    animation: uo-changelog-spin 750ms linear infinite;
}

.uo-changelog-error { flex-direction: column; padding: 24px; text-align: center; }
.uo-changelog-error p { margin: 0; }

.uo-changelog-retry {
    min-height: 38px;
    padding: 0 15px;
    border: 1px solid var(--border-subtle);
    border-radius: 9px;
    background: var(--bg-base);
    color: var(--text-primary);
    font: inherit;
    cursor: pointer;
}

@keyframes uo-changelog-spin { to { transform: rotate(360deg); } }

html[data-theme="light"] .uo-product-tablist,
html[data-theme="light"] .uo-changelog-intro,
html[data-theme="light"] .uo-changelog-release,
html[data-theme="light"] .uo-changelog-loading,
html[data-theme="light"] .uo-changelog-error {
    box-shadow: 0 12px 34px rgba(30, 48, 73, 0.07);
}

@media (max-width: 700px) {
    .uo-product-tabs { margin-bottom: 26px; }
    .uo-product-tablist { width: 100%; }
    .uo-product-tab { flex: 1; padding-inline: 12px; }
    .uo-changelog-intro { margin-top: 10px; border-radius: 16px; }
    .uo-changelog-release { border-radius: 15px; }
    .uo-changelog-release > header { padding: 16px 18px; }
    .uo-changelog-release-body { padding: 5px 18px 18px; }
}

@media (prefers-reduced-motion: reduce) {
    .uo-product-tab { transition: none; }
    .uo-changelog-loading span { animation-duration: 2.4s; }
}