.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 52px;
    padding: 0 28px;
    border: 1px solid var(--color-ink);
    background: var(--color-ink);
    color: var(--color-white);
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 800;
    line-height: 1;
    text-transform: uppercase;
    transition: background-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
    white-space: nowrap;
}

.btn:hover {
    background: var(--color-white);
    color: var(--color-ink);
    transform: translateY(-1px);
}

.btn--outlined {
    background: transparent;
    color: var(--color-ink);
}

.btn--outlined:hover {
    background: var(--color-ink);
    color: var(--color-white);
}

.btn--ghost {
    min-height: auto;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--color-ink);
    text-decoration: underline;
    text-underline-offset: 4px;
}

.btn--ghost:hover {
    background: transparent;
    color: var(--color-muted);
}

.btn--full {
    width: 100%;
}

.badge {
    display: inline-flex;
    width: fit-content;
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
}

.post-card,
.book-card {
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: transparent;
}

.post-card__thumbnail {
    aspect-ratio: 16 / 10;
    overflow: hidden;
    margin-bottom: 22px;
    background: var(--color-paper-deep);
    filter: grayscale(1);
}

.post-card__thumbnail img,
.book-card__cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.34s ease;
}

.post-card:hover .post-card__thumbnail img,
.book-card:hover .book-card__cover img {
    transform: scale(1.035);
}

.post-card__body {
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 12px;
}

.post-card__title {
    font-size: clamp(26px, 3vw, 42px);
    line-height: 0.96;
    letter-spacing: -0.055em;
}

.post-card__title a:hover,
.book-card__title a:hover {
    color: var(--color-muted);
}

.post-card__excerpt,
.book-card__excerpt {
    display: -webkit-box;
    overflow: hidden;
    color: var(--color-ink);
    -webkit-box-orient: vertical;
}

.post-card__excerpt {
    -webkit-line-clamp: 3;
}

.post-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: auto;
    color: var(--color-muted);
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
}

.book-card__cover {
    aspect-ratio: 2 / 3;
    overflow: hidden;
    margin-bottom: 18px;
    background: var(--color-paper-deep);
    filter: grayscale(1);
}

.book-card__body {
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 8px;
}

.book-card__title {
    font-size: 24px;
    line-height: 0.98;
    letter-spacing: -0.04em;
}

.book-card__author,
.book-card__meta-line,
.book-card__rating {
    color: var(--color-ink);
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
}

.book-card__excerpt {
    -webkit-line-clamp: 2;
}

.book-card__footer {
    margin-top: auto;
    padding-top: 16px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 86px;
    gap: 24px;
}

.site-logo {
    color: var(--color-ink);
    font-family: var(--font-ui);
    font-size: 18px;
    font-weight: 900;
    letter-spacing: -0.04em;
}

.site-logo::before {
    content: "CD";
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    margin-right: 10px;
    border: 2px solid var(--color-ink);
    font-size: 12px;
    letter-spacing: 0;
    vertical-align: middle;
}

.primary-nav__list {
    display: flex;
    align-items: center;
    gap: 34px;
}

.primary-nav__list a {
    display: inline-flex;
    color: var(--color-ink);
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 700;
}

.primary-nav__list a:hover,
.primary-nav__list .current-menu-item > a {
    text-decoration: underline;
    text-underline-offset: 4px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-search-btn,
.nav-toggle,
.mobile-nav__close,
.search-overlay__close,
.search-overlay__submit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border: 1px solid var(--color-ink);
    color: var(--color-ink);
    background: var(--color-white);
}

.header-search-btn:hover,
.nav-toggle:hover,
.mobile-nav__close:hover,
.search-overlay__close:hover,
.search-overlay__submit:hover {
    background: var(--color-ink);
    color: var(--color-white);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
}

.nav-toggle span {
    width: 18px;
    height: 2px;
    background: currentColor;
}

.search-overlay {
    position: fixed;
    inset: 0;
    z-index: 220;
    display: grid;
    place-items: start center;
    padding: 120px 24px 24px;
    background: rgba(255, 255, 255, 0.92);
}

.search-overlay[hidden] {
    display: none;
}

.search-overlay__inner {
    position: relative;
    width: min(760px, 100%);
}

.search-overlay__form {
    display: flex;
    gap: 10px;
    padding: 14px;
    border: 1px solid var(--color-ink);
    background: var(--color-white);
}

.search-overlay__input {
    flex: 1;
    min-width: 0;
    border: 0;
    background: transparent;
    color: var(--color-ink);
    font-family: var(--font-heading);
    font-size: 32px;
    font-weight: 800;
    outline: 0;
}

.search-overlay__close {
    position: absolute;
    top: -54px;
    right: 0;
}

.mobile-nav {
    position: fixed;
    inset: 0 0 0 auto;
    z-index: 210;
    width: min(380px, 90vw);
    padding: 24px;
    border-left: 1px solid var(--color-ink);
    background: var(--color-white);
    transform: translateX(100%);
    transition: transform 0.24s ease;
}

.mobile-nav.is-open {
    transform: translateX(0);
}

.mobile-nav__close {
    margin-left: auto;
}

.mobile-nav__list {
    display: grid;
    gap: 18px;
    margin-top: 36px;
}

.mobile-nav__list a {
    font-family: var(--font-heading);
    font-size: 38px;
    font-weight: 900;
    letter-spacing: -0.055em;
}

.cat-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.cat-filter__item {
    padding: 8px 12px;
    border: 1px solid var(--color-ink);
    background: var(--color-white);
    color: var(--color-ink);
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
}

.cat-filter__item:hover,
.cat-filter__item.is-active {
    background: var(--color-ink);
    color: var(--color-white);
}

.site-footer {
    padding-block: 96px 36px;
    background: var(--color-white);
    color: var(--color-ink);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 56px;
    border-top: 1px solid var(--color-line);
    padding-top: 56px;
}

.footer-logo {
    font-family: var(--font-ui);
    font-size: 18px;
    font-weight: 900;
}

.footer-tagline {
    max-width: 360px;
    margin-top: 14px;
    color: var(--color-ink);
}

.footer-col__title {
    margin-bottom: 14px;
    color: var(--color-ink);
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 900;
    text-transform: uppercase;
}

.footer-col__list {
    display: grid;
    gap: 8px;
    color: var(--color-muted);
}

.footer-col__list a:hover {
    color: var(--color-ink);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    margin-top: 64px;
    color: var(--color-ink);
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
}

@media (max-width: 860px) {
    .primary-nav {
        display: none;
    }

    .nav-toggle {
        display: inline-flex;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
    }
}