@media (max-width: 760px) {
  :root {
    --mobile-header-height: 4.35rem;
  }

  html,
  body {
    overflow-x: hidden;
  }

  body {
    background:
      radial-gradient(circle at 82% 10%, rgba(215, 31, 42, 0.12), transparent 18rem),
      radial-gradient(circle at 10% 42%, rgba(111, 216, 231, 0.08), transparent 20rem),
      var(--bg);
  }

  .site-shell {
    width: 100%;
    max-width: none;
    padding-top: var(--mobile-header-height);
  }

  .site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.95rem;
    align-items: center;
    min-height: var(--mobile-header-height);
    padding: 0.85rem 1rem;
    backdrop-filter: none;
  }

  .brand {
    position: relative;
    z-index: 12;
    width: 5.4rem;
  }

  .menu-toggle {
    appearance: none;
    position: relative;
    z-index: 12;
    display: inline-grid;
    place-items: center;
    width: 2.55rem;
    height: 2.55rem;
    margin: 0;
    border: 1px solid var(--line);
    border-radius: 0;
    background: rgba(9, 9, 9, 0.64);
    color: var(--fg);
    cursor: pointer;
  }

  .menu-toggle span {
    position: absolute;
    width: 1.08rem;
    height: 1px;
    background: currentColor;
    transition: transform 180ms ease;
  }

  .menu-toggle span:first-child {
    transform: translateY(-0.22rem);
  }

  .menu-toggle span:last-child {
    transform: translateY(0.22rem);
  }

  .site-header.is-menu-open .menu-toggle span:first-child {
    transform: rotate(42deg);
  }

  .site-header.is-menu-open .menu-toggle span:last-child {
    transform: rotate(-42deg);
  }

  .nav {
    position: fixed;
    inset: 0;
    z-index: 11;
    display: grid;
    grid-auto-rows: min-content;
    align-content: end;
    gap: 0;
    overflow: hidden auto;
    padding: 5.35rem 1rem 7.8rem;
    background:
      linear-gradient(180deg, rgba(9, 9, 9, 0.98), rgba(9, 9, 9, 0.9)),
      radial-gradient(circle at 84% 12%, rgba(215, 31, 42, 0.16), transparent 18rem);
    color: var(--fg);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-0.7rem);
    transition: opacity 180ms ease, transform 180ms ease;
    white-space: normal;
  }

  .site-header.is-menu-open .nav {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav > a {
    display: block;
    border-top: 1px solid var(--line);
    padding: 0.72rem 0;
    font-size: clamp(1.55rem, 8.6vw, 2.65rem);
    font-weight: 900;
    line-height: 0.94;
    text-transform: uppercase;
  }

  .lang-switch {
    display: flex;
    gap: 0;
    margin: 0.65rem 0 0;
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .lang-switch a {
    flex: 1;
    border-top: 0;
    border-right: 1px solid var(--line);
    padding: 0.72rem 0;
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 850;
    line-height: 1;
    text-align: center;
  }

  .lang-switch a:last-child {
    border-right: 0;
  }

  body.is-menu-locked {
    overflow: hidden;
  }

  .section,
  .blog-page,
  .post-page,
  .album-page {
    padding-right: 1rem;
    padding-left: 1rem;
  }

  .section {
    padding-top: 4.25rem;
    padding-bottom: 4.25rem;
  }

  .hero-art {
    aspect-ratio: 3 / 4;
    max-height: calc(100svh - var(--mobile-header-height));
    border-top: 1px solid rgba(244, 241, 236, 0.08);
  }

  .art-slide::after {
    background: linear-gradient(0deg, rgba(5, 5, 5, 0.82), rgba(5, 5, 5, 0.14) 62%, rgba(5, 5, 5, 0.16));
  }

  .art-slide-copy {
    top: auto;
    right: 1rem;
    bottom: 3.65rem;
    left: 1rem;
    max-width: none;
  }

  .art-slide-kicker {
    display: none;
  }

  .art-slide-title {
    max-width: 100%;
    margin: 0 0 0.28rem;
    font-size: clamp(1.25rem, 5.75vw, 1.85rem);
    line-height: 0.98;
  }

  .art-slide-subtitle {
    max-width: 100%;
    font-size: 0.58rem;
    line-height: 1.18;
  }

  .art-slide-thought {
    display: none;
  }

  .art-play {
    margin-top: 0.55rem;
    padding: 0.5rem 0.66rem;
    font-size: 0.62rem;
  }

  .art-slider-ui {
    right: 1rem;
    bottom: 0.7rem;
    left: 1rem;
    gap: 0.5rem;
  }

  .art-nav {
    width: 1.95rem;
    height: 1.95rem;
  }

  .kicker {
    margin-bottom: 0.75rem;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
  }
}

@media (max-width: 620px) {
  .hero {
    gap: 1.6rem;
    padding: 2.2rem 1rem 2rem;
  }

  .hero h1,
  :lang(ko) .hero h1,
  :lang(ja) .hero h1 {
    max-width: 100%;
    font-size: clamp(2.45rem, 11.8vw, 3.55rem);
    line-height: 0.98;
    overflow-wrap: anywhere;
  }

  :lang(ja) .hero h1 {
    font-size: clamp(2.15rem, 9.8vw, 3.15rem);
    line-height: 1.1;
    overflow-wrap: anywhere;
    word-break: normal;
  }

  .hero-text {
    font-size: 1rem;
    line-height: 1.56;
  }

  .hero-media {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.55rem;
    overflow: hidden;
  }

  .hero-media img {
    aspect-ratio: 4 / 5;
    height: auto;
    min-height: 0;
  }

  .hero-media img:first-child {
    grid-column: 1 / 3;
    aspect-ratio: 16 / 10;
  }

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

  .ticker span {
    padding: 0.78rem 1rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    font-size: 0.78rem;
  }

  .section-heading h2,
  .manifesto h2,
  :lang(ko) .manifesto h2,
  :lang(ja) .manifesto h2 {
    max-width: 100%;
    font-size: clamp(2.25rem, 11vw, 3.8rem);
    line-height: 0.96;
    overflow-wrap: anywhere;
  }

  .manifesto {
    min-height: auto;
  }

  .album-row {
    grid-template-columns: 1.8rem 4.8rem minmax(0, 1fr);
    gap: 0.75rem;
  }

  .album-row h3 {
    font-size: clamp(1.25rem, 7.2vw, 2rem);
    overflow-wrap: anywhere;
  }

  .album-row p {
    font-size: 0.92rem;
  }

  .blog-masthead {
    min-height: auto;
    padding-top: 2.25rem;
    padding-bottom: 3.25rem;
  }

  .blog-masthead h1,
  :lang(ko) .blog-masthead h1,
  :lang(ja) .blog-masthead h1,
  .blog-feature h2,
  .blog-index h2,
  .blog-categories h2 {
    max-width: 100%;
    font-size: clamp(2.55rem, 12vw, 4rem);
    line-height: 0.96;
    overflow-wrap: anywhere;
  }

  .blog-feature {
    gap: 1.5rem;
    padding: 3.25rem 0;
  }

  .blog-feature figure {
    aspect-ratio: 16 / 10;
  }

  .blog-list strong {
    font-size: clamp(1.16rem, 5.8vw, 1.62rem);
    line-height: 1.12;
    overflow-wrap: anywhere;
  }

  .blog-list time {
    justify-self: start;
  }

  .blog-categories li {
    min-height: 7.5rem;
  }

  .post-masthead {
    gap: 1.2rem;
    padding-top: 1.05rem;
    padding-bottom: 1.75rem;
    border-bottom: 0;
  }

  .post-page .back-link {
    margin-bottom: 1.5rem;
    color: #d9d2ca;
    font-size: 0.72rem;
  }

  .post-title-block h1 {
    max-width: 100%;
    margin-bottom: 1rem;
    font-size: clamp(2.25rem, 10.2vw, 3.3rem);
    line-height: 1.02;
    letter-spacing: 0;
    overflow-wrap: break-word;
  }

  .post-subtitle {
    display: block;
    width: max-content;
    max-width: 100%;
    margin-bottom: 0.7rem;
    border-top: 0;
    border-bottom: 1px solid rgba(244, 241, 236, 0.18);
    padding: 0 0 0.55rem;
    color: var(--muted);
    font-size: 0.82rem;
    line-height: 1.25;
  }

  .post-title-block p:not(.kicker):not(.post-subtitle) {
    max-width: 100%;
    color: #ddd6ce;
    font-size: 0.98rem;
    line-height: 1.62;
  }

  .post-cover {
    width: calc(100% + 2rem);
    margin-left: -1rem;
    aspect-ratio: 16 / 9;
    min-height: 0;
    max-height: none;
    border-top: 1px solid rgba(244, 241, 236, 0.12);
    border-bottom: 1px solid rgba(244, 241, 236, 0.12);
  }

  .post-cover::after {
    background: linear-gradient(180deg, rgba(9, 9, 9, 0.02), rgba(9, 9, 9, 0.28));
  }

  .post-read {
    gap: 1.75rem;
    padding-top: 1.45rem;
  }

  .post-meta-panel {
    display: block;
    margin-bottom: 0.2rem;
    border-top: 1px solid rgba(244, 241, 236, 0.14);
    border-bottom: 1px solid rgba(244, 241, 236, 0.14);
    padding: 0.85rem 0 0.95rem;
  }

  .post-meta-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1rem;
    margin-bottom: 0.8rem;
  }

  .post-meta-list div {
    display: inline-flex;
    align-items: baseline;
    gap: 0.42rem;
    border-top: 0;
    padding-top: 0;
  }

  .post-meta-list div + div {
    border-left: 0;
    padding-left: 0;
  }

  .post-meta-list dt {
    margin-bottom: 0;
    font-size: 0.66rem;
  }

  .post-meta-list dd {
    font-size: 0.88rem;
    line-height: 1.2;
  }

  .post-tags {
    gap: 0.35rem;
  }

  .post-tags span {
    border-color: rgba(244, 241, 236, 0.2);
    padding: 0.38rem 0.48rem;
    color: #bfb8b0;
    font-size: 0.64rem;
    line-height: 1.1;
  }

  .post-body {
    max-width: 100%;
    color: #e2dcd5;
    font-size: 0.99rem;
    font-weight: 400;
    line-height: 1.82;
    word-break: keep-all;
    overflow-wrap: break-word;
  }

  :lang(ja) .post-body {
    overflow-wrap: anywhere;
    word-break: normal;
  }

  .post-body > p:first-of-type {
    margin-bottom: 2rem;
    color: #f1ede8;
    font-size: 1.04rem;
    font-weight: 560;
    line-height: 1.68;
  }

  .post-body p {
    margin-bottom: 1.35rem;
  }

  .post-body h2 {
    margin: 3rem 0 1rem;
    padding-top: 1rem;
    font-size: clamp(1.55rem, 7.2vw, 2.25rem);
    line-height: 1.1;
  }

  .post-body h3 {
    margin-top: 2rem;
    font-size: 1.22rem;
    line-height: 1.18;
  }

  .article-image {
    width: calc(100% + 2rem);
    margin: 2.2rem 0 2.4rem -1rem;
    padding: 0;
    border-top: 1px solid rgba(244, 241, 236, 0.12);
    border-bottom: 1px solid rgba(244, 241, 236, 0.12);
  }

  .article-image img {
    max-height: none;
    aspect-ratio: 16 / 10;
  }

  .article-image figcaption {
    padding: 0.75rem 1rem 0.85rem;
    font-size: 0.7rem;
  }

  .album-masthead {
    gap: 1.6rem;
    padding-top: 2.2rem;
  }

  .album-title-block .back-link {
    margin-bottom: 2rem;
  }

  .album-title-block h1 {
    max-width: 100%;
    font-size: clamp(2.85rem, 14vw, 4.45rem);
    line-height: 0.92;
    overflow-wrap: anywhere;
  }

  .album-thesis {
    font-size: 1rem;
    line-height: 1.58;
  }

  .album-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.55rem;
  }

  .platform-link {
    justify-content: center;
    min-height: 2.45rem;
    padding: 0.66rem 0.55rem;
    font-size: 0.68rem;
    text-align: center;
  }

  .album-cover-frame img {
    aspect-ratio: 4 / 5;
    object-position: center top;
  }

  .album-brief,
  .album-world,
  .album-listen,
  .album-track-section,
  .lyrics-section,
  .full-lyrics-section,
  .album-faq {
    padding-top: 3.75rem;
    padding-bottom: 3.75rem;
  }

  .album-brief h2,
  .album-world h2,
  .album-section-head h2,
  .album-faq h2 {
    max-width: 100%;
    font-size: clamp(1.72rem, 8.4vw, 2.75rem);
    line-height: 1.04;
    overflow-wrap: anywhere;
  }

  .album-section-head {
    gap: 0.9rem;
    margin-bottom: 2rem;
  }

  .listen-grid {
    gap: 1.35rem;
  }

  .listen-visual img {
    aspect-ratio: 16 / 10;
  }

  .audio-item {
    grid-template-columns: 2rem minmax(0, 1fr);
    gap: 0.7rem;
  }

  .track-title,
  .lyric-note h3,
  .full-lyrics summary strong,
  .faq-item h3 {
    overflow-wrap: anywhere;
  }

  .track-note,
  .lyric-reading,
  .faq-item p,
  .album-prose {
    font-size: 0.98rem;
    line-height: 1.68;
  }

  .world-cell {
    min-height: auto;
  }
}

@media (max-width: 390px) {
  .hero-art {
    aspect-ratio: 7 / 9;
  }

  .art-slide-copy {
    right: 0.85rem;
    bottom: 3.35rem;
    left: 0.85rem;
  }

  .art-slide-title {
    margin-bottom: 0.2rem;
    font-size: 1.28rem;
    line-height: 1;
  }

  .art-slide-subtitle {
    font-size: 0.52rem;
    letter-spacing: 0.055em;
  }

  .art-play {
    margin-top: 0.45rem;
    padding: 0.46rem 0.58rem;
    font-size: 0.56rem;
  }

  .art-slider-ui {
    right: 0.85rem;
    bottom: 0.6rem;
    left: 0.85rem;
    gap: 0.4rem;
  }

  .art-nav {
    width: 1.78rem;
    height: 1.78rem;
  }

  .art-pagination {
    gap: 0.28rem;
  }

  .nav > a {
    padding: 0.6rem 0;
    font-size: clamp(1.35rem, 8vw, 2.15rem);
    line-height: 0.96;
  }

  .lang-switch {
    margin-top: 0.5rem;
  }

  .lang-switch a {
    padding: 0.62rem 0;
    font-size: 0.72rem;
  }

  .album-actions {
    grid-template-columns: 1fr;
  }
}