.blog-sidebar {
    position: sticky;
    top: calc(var(--header-height) + 2rem);

    display: grid;
    gap: 1rem;

    min-width: 0;
}

.author-card,
.sidebar-card {
    position: relative;
    overflow: hidden;

    border: 1px solid var(--color-border);
    border-radius: var(--blog-radius-md);

    color: var(--color-text);
    background: var(--blog-card-bg);

    box-shadow: var(--shadow-soft);

    transition:
        color var(--transition-theme),
        background var(--transition-theme),
        border-color var(--transition-theme),
        box-shadow var(--transition-theme);
}

.author-card {
    padding: 1.2rem;
}

.author-card::before,
.sidebar-card::before {
    content: "";

    position: absolute;
    inset: 0;

    pointer-events: none;

    background:
        linear-gradient(180deg,
            rgba(255, 255, 255, 0.035),
            transparent 58%);

    opacity: 1;

    transition:
        background var(--transition-theme),
        opacity var(--transition-theme);
}

html[data-theme="light"] .author-card::before,
html[data-theme="light"] .sidebar-card::before {
    background:
        linear-gradient(180deg,
            rgba(23, 23, 23, 0.025),
            transparent 58%);
}

.author-card>*,
.sidebar-card>* {
    position: relative;
}

.author-card__header {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.author-card__header img {
    width: 72px;
    height: 72px;

    border: 1px solid var(--color-border-strong);
    border-radius: 50%;

    object-fit: cover;
    background: var(--color-bg);
}

.author-card__eyebrow,
.sidebar-card__eyebrow {
    margin: 0;

    color: var(--color-text-muted);

    font-size: 0.72rem;
    font-weight: 850;
    line-height: 1;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.author-card h2,
.sidebar-card h2 {
    margin: 0.25rem 0 0;

    color: var(--color-text);

    font-size: 1.25rem;
    line-height: 1.1;
    letter-spacing: -0.04em;
}

.author-card__header p:last-child {
    margin: 0.18rem 0 0;

    color: var(--color-text-muted);

    font-size: 0.9rem;
}

.author-card__bio {
    margin: 1rem 0 0;

    color: var(--color-text-muted);

    line-height: 1.7;
}

.author-card__actions {
    display: flex;
    align-items: center;
    gap: 0.65rem;

    margin-top: 1rem;
}

.author-card__button {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    flex: 1;

    min-height: 40px;

    border: 1px solid var(--color-text);
    border-radius: var(--radius-full);

    color: var(--color-text);
    background: transparent;

    font-size: 0.78rem;
    font-weight: 850;
    letter-spacing: 0.1em;
    text-transform: uppercase;

    transition:
        transform 220ms ease,
        color 220ms ease,
        background-color 220ms ease,
        border-color 220ms ease,
        box-shadow 220ms ease;
}

.author-card__button:hover {
    transform: translateY(-2px);

    color: var(--color-bg);
    background: var(--color-text);
    border-color: var(--color-text);

    box-shadow: var(--shadow-soft);
}

.author-card__social {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;

    flex: 0 0 auto;
}

.author-card__social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 40px;
    height: 40px;
    min-width: 40px;

    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);

    color: var(--color-text);
    background: transparent;

    transition:
        transform 220ms ease,
        color 220ms ease,
        background-color 220ms ease,
        border-color 220ms ease,
        box-shadow 220ms ease;
}

.author-card__social-link svg {
    width: 1.08rem;
    height: 1.08rem;
}

.author-card__social-link:hover {
    transform: translateY(-2px);

    color: var(--color-bg);
    background: var(--color-text);
    border-color: var(--color-text);

    box-shadow: var(--shadow-soft);
}

.sidebar-card {
    padding: 1.2rem;
}

.sidebar-list {
    position: relative;

    display: grid;
    gap: 0.5rem;

    margin: 1rem 0 0;
    padding: 0;

    list-style: none;
}

.sidebar-list a {
    display: flex;
    min-height: 40px;
    align-items: center;
    justify-content: space-between;

    padding: 0.65rem 0.8rem;

    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);

    color: var(--color-text-muted);
    background: transparent;

    transition:
        color 180ms ease,
        background-color 180ms ease,
        border-color 180ms ease,
        transform 180ms ease;
}

.sidebar-list a::after {
    content: "→";

    color: var(--color-text-muted);

    transition:
        color 180ms ease,
        transform 180ms ease;
}

.sidebar-list a:hover {
    transform: translateY(-1px);

    color: var(--color-text);
    border-color: var(--color-border-strong);
    background: var(--color-accent-soft);
}

.sidebar-list a:hover::after {
    color: var(--color-text);
    transform: translateX(2px);
}

@media (max-width: 1080px) {
    .blog-sidebar {
        position: static;
    }
}

@media (max-width: 520px) {
    .author-card__header {
        align-items: flex-start;
    }

    .author-card__actions {
        display: grid;
    }

    .author-card__button {
        width: 100%;
    }

    .author-card__social {
        justify-content: center;
    }
}

@media (prefers-reduced-motion: reduce) {

    .author-card__button:hover,
    .author-card__social-link:hover,
    .sidebar-list a:hover {
        transform: none;
    }
}