@media (max-width: 680px) {
  .container {
    width: calc(100% - 32px);
  }
  .site-header {
    height: auto;
  }
  .header-inner {
    min-height: 70px;
    display: grid;
    grid-template-columns: 1fr auto;
    padding-block: 10px;
  }
  .brand { grid-column: 1; grid-row: 1; }
  .language-switch { grid-column: 2; grid-row: 1; }
  .brand-word {
    font-size: 29px;
  }
  .main-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    justify-content: space-between;
    gap: 8px;
  }
  .nav-link {
    font-size: 12px;
    padding: 8px 0;
  }
  .nav-library {
    padding: 7px 9px;
  }
  .hero-grid {
    display: block;
    min-height: 0;
  }
  .hero-copy {
    padding: 60px 0 10px;
  }
  .hero h1 {
    font-size: clamp(48px, 12vw, 65px);
    margin-top: 21px;
  }
  .hero-copy > p {
    font-size: 15px;
  }
  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }
  .hero-art {
    height: 325px;
    transform: scale(0.7);
    transform-origin: center top;
    margin-bottom: -55px;
  }
  .hero-art__paper {
    width: 430px;
  }
  .hero-art__note {
    right: -55px;
  }
  .trust-inner {
    flex-wrap: wrap;
    justify-content: flex-start;
    padding-block: 16px;
    gap: 12px 25px;
    font-size: 10px;
  }
  .catalog-section {
    padding-top: 65px;
    padding-bottom: 65px;
  }
  .section-head {
    display: block;
  }
  .section-head h2 {
    font-size: 45px;
  }
  .section-head > p {
    margin-top: 15px;
  }
  .filters {
    gap: 4px;
  }
  .filters button {
    font-size: 11px;
    padding: 8px;
  }
  .book-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 14px;
  }
  .book-card .cover {
    height: 255px;
  }
  .cover__inner {
    padding: 17px;
  }
  .cover__inner strong {
    font-size: 22px;
  }
  .cover__inner > span:last-child {
    font-size: 11px;
  }
  .book-card__title {
    font-size: 20px;
  }
  .book-card__body p {
    font-size: 11px;
  }
  .how-section {
    padding: 70px 0;
  }
  .how-grid {
    grid-template-columns: 1fr;
    gap: 35px;
  }
  .how-section h2 {
    font-size: 46px;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  .footer-reset {
    justify-self: start;
  }
  .detail-page {
    padding-bottom: 55px;
  }
  .detail-layout {
    grid-template-columns: 1fr;
    margin-top: 28px;
  }
  .detail-cover {
    height: 430px;
    max-width: 315px;
  }
  .detail-copy {
    padding-top: 0;
  }
  .detail-copy h1 {
    font-size: 54px;
  }
  .detail-description {
    font-size: 15px;
  }
  .detail-copy blockquote {
    font-size: 22px;
  }
  .detail-facts {
    gap: 20px;
  }
  .detail-next {
    margin-top: 70px;
  }
  .related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 15px;
  }
  .related-grid .cover {
    height: 210px;
  }
  .library-page {
    padding-top: 55px;
  }
  .library-page h1 {
    font-size: 52px;
  }
  .library-item {
    grid-template-columns: 88px 1fr;
    gap: 15px;
  }
  .library-cover {
    height: 120px;
  }
  .library-item h2 {
    font-size: 23px;
  }
  .library-item .button {
    grid-column: 1/-1;
  }
  .reader-top {
    font-size: 11px;
    height: 64px;
  }
  .reader-top > span {
    max-width: 130px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .reader-layout {
    display: flex;
    flex-direction: column;
    padding-top: 16px;
    gap: 18px;
  }
  .reader-side {
    position: static;
  }
  .reader-side__head,
  .reader-side__bottom {
    display: none;
  }
  .reader-chapters {
    margin: 0;
    display: flex;
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 5px;
  }
  .side-label {
    display: none;
  }
  .chapter-link {
    min-width: 135px;
    border: 1px solid #d8e0d5;
    padding: 9px;
    font-size: 11px;
  }
  .chapter-link strong {
    font-size: 11px;
  }
  .reader-content {
    padding: 19px 22px 40px;
    min-height: 600px;
  }
  .reader-text {
    font-size: calc(17px * var(--reader-scale));
  }
  .reader-text h1 {
    font-size: calc(32px * var(--reader-scale));
  }
  .reader-kicker {
    margin-top: 40px;
  }
  .access-dialog {
    padding: 35px 25px;
  }
  .access-dialog h2 {
    font-size: 35px;
  }
}
@media (max-width: 390px) {
  .book-grid {
    grid-template-columns: 1fr;
  }
  .book-card .cover {
    height: 330px;
  }
  .cover__inner strong {
    font-size: 28px;
  }
  .related-grid .cover {
    height: 190px;
  }
  .related-grid .cover__inner strong {
    font-size: 18px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .button {
    transition: none;
  }
  .book-card .cover { transition: none; }
}
@media (max-width: 680px) {
  .reader-side {
    min-width: 0;
    width: 100%;
  }
  .reader-chapters {
    max-width: 100%;
  }
}