/* ── HERO ── */
  .hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    position: relative;
    padding-top: calc(80px + env(safe-area-inset-top, 0px));
  }

  .hero-left {
    padding: var(--ds-space-10) var(--ds-space-7) var(--ds-space-9) var(--ds-space-7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-right: 1px solid var(--line);
    min-width: 0;
    background: linear-gradient(135deg, rgba(255, 253, 248, 0.35) 0%, transparent 55%);
    box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.25);
  }

  .hero-tag {
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 2rem;
    display: inline-flex;
    align-items: center;
    width: fit-content;
    max-width: 100%;
    padding: 0.5rem 1rem 0.5rem 0.85rem;
    border-radius: 100px;
    background: var(--glass-surface);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-highlight);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }

  .hero-name {
    font-family: var(--serif);
    font-size: clamp(4rem, 8vw, 7rem);
    font-weight: 800;
    line-height: 1.0;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
  }

  .hero-name-en {
    font-family: var(--mono);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    color: var(--muted);
    margin-bottom: 2rem;
    font-style: italic;
  }

  .hero-pitch {
    font-family: var(--serif);
    font-size: clamp(1.05rem, 2.1vw, 1.28rem);
    font-weight: 600;
    line-height: 1.55;
    color: var(--ink);
    max-width: 100%;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
    line-break: strict;
    word-break: normal;
    overflow-wrap: break-word;
    text-wrap: pretty;
  }

  .hero-pitch-sub {
    font-size: 0.9rem;
    line-height: 1.75;
    color: var(--muted);
    max-width: 100%;
    margin-bottom: 1.35rem;
    line-break: strict;
    word-break: normal;
    overflow-wrap: break-word;
    text-wrap: pretty;
  }

  .hero-stack {
    font-family: var(--mono);
    font-size: 0.8125rem;
    font-weight: 400;
    line-height: 1.65;
    letter-spacing: 0.04em;
    color: var(--ds-color-label-secondary);
    max-width: 100%;
    margin-bottom: var(--ds-space-5);
    padding: var(--ds-space-3) var(--ds-space-4);
    border-radius: var(--ds-radius-md);
    background: var(--glass-surface);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-highlight), var(--glass-shadow);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    line-break: strict;
    word-break: normal;
    overflow-wrap: break-word;
  }

  .hero-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 var(--ds-space-5);
    margin-top: 0.15rem;
    margin-bottom: var(--ds-space-5);
    font-family: var(--sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--paper-0);
    background: linear-gradient(165deg, #d64a22 0%, var(--accent) 48%, var(--ds-color-accent-pressed) 100%);
    text-decoration: none;
    border-radius: 100px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    box-shadow:
      var(--inset-paper),
      0 6px 24px -6px rgba(200, 64, 26, 0.45);
    transition:
      opacity var(--ds-duration-fast) var(--ds-ease-standard),
      transform var(--ds-duration-fast) var(--ds-ease-standard),
      box-shadow var(--ds-duration-fast) var(--ds-ease-standard);
  }

  .hero-cta:hover {
    opacity: 1;
    transform: translateY(-2px);
    box-shadow:
      var(--inset-paper),
      0 14px 36px -10px rgba(200, 64, 26, 0.55);
  }

  .hero-cta:active {
    opacity: 0.88;
    transform: translateY(0);
    box-shadow:
      var(--inset-paper),
      0 4px 16px -8px rgba(200, 64, 26, 0.4);
  }

  .hero-desc {
    font-size: 0.95rem;
    line-height: 1.9;
    color: var(--muted);
    max-width: 100%;
    border-left: 2px solid var(--accent);
    padding-left: 1.5rem;
    margin: 0 0 1.35rem;
    line-break: strict;
    word-break: normal;
    overflow-wrap: break-word;
    text-wrap: pretty;
  }

  .hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem 2.5rem;
  }

  .stat {
    display: flex;
    flex-direction: column;
  }

  .stat-num {
    font-family: var(--serif);
    font-size: 2rem;
    font-weight: 600;
    line-height: 1;
  }

  .stat-label {
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.15em;
    color: var(--muted);
    text-transform: uppercase;
    margin-top: 0.3rem;
  }

  /* 上端は .hero-left のタグ周りと同じトークンで揃える（詰めすぎ防止） */
  .hero-right {
    padding: var(--ds-space-10) 3rem 6rem 4rem;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    gap: 0;
    position: relative;
    min-width: 0;
  }

  /* Chapter list in hero right */
  .chapter-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0;
    margin: 0;
  }

  .chapter-list > li {
    list-style: none;
    margin: 0;
    padding: 0;
    border-bottom: 1px solid var(--line);
  }

  .chapter-list > li:first-child {
    border-top: 1px solid var(--line);
  }

  .chapter-item {
    display: flex;
    align-items: baseline;
    gap: 1.5rem;
    padding: 1.35rem 1rem;
    margin: 0 -2px;
    border-radius: var(--ds-radius-md);
    border-bottom: none;
    cursor: pointer;
    transition:
      background var(--ds-duration-normal) var(--ds-ease-standard),
      box-shadow var(--ds-duration-normal) var(--ds-ease-standard),
      border-color var(--ds-duration-normal) var(--ds-ease-standard),
      transform var(--ds-duration-fast) var(--ds-ease-standard);
    text-decoration: none;
    color: inherit;
    border: 1px solid transparent;
  }

  .chapter-item:hover {
    background: var(--glass-surface-hover);
    border-color: var(--glass-border);
    box-shadow: var(--glass-highlight), var(--glass-shadow);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    transform: translateX(-3px);
  }

  .chapter-item:hover .chapter-title { color: var(--accent); }
  .chapter-item:hover .chapter-num { color: var(--ink); }

  .chapter-num {
    font-family: var(--mono);
    font-size: 0.62rem;
    color: var(--muted);
    letter-spacing: 0.1em;
    min-width: 2rem;
    transition: color 0.2s;
  }

  .chapter-content { flex: 1; }

  .chapter-title {
    font-family: var(--serif);
    font-size: 1rem;
    font-weight: 600;
    transition: color 0.2s;
    display: block;
    margin-bottom: 0.2rem;
  }

  .chapter-sub {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--muted);
    letter-spacing: 0.08em;
  }

  .chapter-arrow {
    font-size: 0.8rem;
    color: var(--muted);
    transition: transform 0.2s, color 0.2s;
  }
  .chapter-item:hover .chapter-arrow {
    transform: translateX(4px);
    color: var(--accent);
  }

  /* ── SECTION BASE ── */
  section {
    padding: var(--ds-section-pad-y) 0;
  }

  .container {
    width: 100%;
    max-width: var(--ds-container-max);
    margin: 0 auto;
    padding: 0 max(var(--ds-space-6), env(safe-area-inset-right)) 0 max(var(--ds-space-6), env(safe-area-inset-left));
  }

  .section-header {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 5rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--line);
    position: relative;
  }

  .section-header::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 3.5rem;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), rgba(200, 64, 26, 0.08));
    border-radius: 1px;
  }

  .story .section-header {
    border-bottom-color: rgba(245, 240, 232, 0.12);
  }

  .story .section-header::after {
    background: linear-gradient(90deg, var(--accent), rgba(200, 64, 26, 0.2));
  }

  .contact .section-header {
    justify-content: center;
    border-bottom-color: rgba(245, 240, 232, 0.12);
  }

  .contact .section-header::after {
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    width: 4rem;
  }

  .section-num {
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.2em;
    color: var(--accent);
  }

  .section-title {
    font-family: var(--serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.1;
  }

  /* ── STORY SECTION ── */
  .story {
    position: relative;
    background: linear-gradient(168deg, #1f1c19 0%, var(--ink) 42%, #141210 100%);
    color: var(--paper);
    overflow: hidden;
  }

  .story::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='sn'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23sn)' opacity='0.06'/%3E%3C/svg%3E");
    opacity: 0.5;
    mix-blend-mode: overlay;
    pointer-events: none;
    z-index: 0;
  }

  .story .container {
    position: relative;
    z-index: 1;
  }

  .story .section-num { color: var(--accent); }

  .story-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 6rem;
    align-items: start;
  }

  .story-timeline {
    position: sticky;
    top: 120px;
    display: flex;
    flex-direction: column;
    gap: 0;
  }

  .timeline-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding: 1.2rem 0;
    border-bottom: 1px solid rgba(245,240,232,0.1);
    cursor: pointer;
    transition: all 0.2s;
  }

  .timeline-item:first-child { border-top: 1px solid rgba(245,240,232,0.1); }

  .timeline-year {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--accent);
    letter-spacing: 0.15em;
  }

  .timeline-label {
    font-family: var(--serif);
    font-size: 0.9rem;
    color: rgba(245,240,232,0.7);
    transition: color 0.2s;
  }

  .timeline-item:hover .timeline-label { color: var(--paper); }

  .story-content {
    display: flex;
    flex-direction: column;
    gap: 4rem;
  }

  .story-chapter {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
  }

  .story-chapter-tag {
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
  }

  .story-chapter-title {
    font-family: var(--serif);
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--paper);
    line-height: 1.3;
  }

  .story-chapter-body {
    font-family: var(--serif);
    font-size: 0.92rem;
    line-height: 2.12;
    letter-spacing: 0.04em;
    color: rgba(245,240,232,0.68);
    max-width: 560px;
    font-weight: 400;
  }

  .story-chapter-body strong {
    color: var(--paper);
    font-weight: 500;
  }

  /* ── セクション装飾（本の小口風） ── */
  .section-ornament {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(1rem, 4vw, 2rem);
    padding: 2rem 3rem;
    pointer-events: none;
  }

  .section-ornament__rule {
    flex: 1;
    height: 1px;
    max-width: 10rem;
    background: var(--line);
  }

  .section-ornament__mark {
    font-family: var(--serif);
    font-size: 0.45rem;
    line-height: 1;
    color: var(--accent);
    opacity: 0.65;
    letter-spacing: 0;
  }

  /* グラデーションは使わず、背景と1px境界でくっきり切り替え */
  .section-ornament--bleed-dark {
    padding: 1.5rem 3rem 1.75rem;
    background: var(--ink);
    border-top: 1px solid var(--line);
  }

  .section-ornament--bleed-dark .section-ornament__rule {
    background: rgba(245, 240, 232, 0.22);
  }

  .section-ornament--bleed-dark .section-ornament__mark {
    opacity: 0.85;
  }

  .section-ornament--bleed-light {
    padding: 1.75rem 3rem 1.5rem;
    background: var(--paper-0);
    border-top: 1px solid var(--line);
  }

  .section-ornament--to-contact {
    padding: 1.5rem 3rem 1.75rem;
    background: var(--ink);
    border-top: 1px solid var(--line);
  }

  .section-ornament--to-contact .section-ornament__rule {
    background: rgba(245, 240, 232, 0.2);
  }

  .section-ornament--paper-break {
    padding: 1.25rem 3rem;
    background: var(--paper-1);
    border-top: 1px solid var(--line);
  }

  /* ── アクティビティ（Qiita / note / GitHub 時系列・Lapras 型ログ） ── */
  .articles-lead {
    font-size: 0.9rem;
    line-height: 1.75;
    color: var(--muted);
    max-width: 44rem;
    margin: 0 0 1.75rem;
  }

  .activity-feed {
    margin-top: 0.5rem;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-paper);
    border-radius: 2px;
    overflow: hidden;
    background: linear-gradient(180deg, rgba(255, 253, 248, 0.55) 0%, rgba(248, 242, 232, 0.28) 100%);
  }

  .activity-feed.feed-load-failed .activity-timeline-root:empty {
    min-height: 0;
  }

  .activity-log-toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem 1.5rem;
    padding: 1.15rem 1.35rem 1.15rem 1.5rem;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(255, 253, 248, 0.92) 0%, rgba(248, 242, 232, 0.55) 100%);
    box-shadow: var(--inset-paper);
  }

  .activity-log-toolbar__hint {
    font-family: var(--mono);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--muted);
    text-transform: uppercase;
  }

  .activity-log-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 1.35rem;
    align-items: center;
  }

  .activity-log-links a {
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.2s, border-color 0.2s;
  }

  .activity-log-links a:hover {
    color: var(--accent);
    border-bottom-color: rgba(200, 64, 26, 0.35);
  }

  .activity-timeline-root {
    padding: 0;
    margin: 0;
  }

  .activity-timeline-empty {
    padding: 2.5rem 1.5rem;
    text-align: center;
    font-size: 0.88rem;
    color: var(--muted);
    border-top: 1px dashed var(--line);
  }

  .activity-year {
    position: relative;
    padding: 1.5rem 1.25rem 0.25rem 1.25rem;
    border-bottom: 1px solid var(--line);
  }

  .activity-year:last-of-type {
    border-bottom: none;
  }

  .activity-year__title {
    font-family: var(--serif);
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin: 0 0 1.1rem;
    line-height: 1.2;
  }

  .activity-year__body {
    position: relative;
    --at-date-w: 5.25rem;
    --at-spine-w: 1.5rem;
  }

  .activity-year__spine {
    position: absolute;
    left: calc(var(--at-date-w) + var(--at-spine-w) * 0.5);
    top: 0.35rem;
    bottom: 0.35rem;
    width: 1px;
    background: linear-gradient(180deg, rgba(26, 23, 20, 0.14), rgba(26, 23, 20, 0.06));
    transform: translateX(-50%);
    pointer-events: none;
  }

  .activity-year__list {
    list-style: none;
    margin: 0;
    padding: 0 0 0.75rem;
    position: relative;
    z-index: 0;
  }

  .activity-slot {
    display: grid;
    grid-template-columns: var(--at-date-w) var(--at-spine-w) minmax(0, 1fr);
    gap: 0 0.25rem;
    align-items: start;
    margin: 0 0 1.35rem;
  }

  .activity-year__list > .activity-slot:last-child {
    margin-bottom: 0.35rem;
  }

  .activity-more-row {
    list-style: none;
    margin: -2.35rem 0 1.15rem;
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: var(--at-date-w) var(--at-spine-w) minmax(0, 1fr);
    gap: 0 0.25rem;
    align-items: start;
  }

  .activity-more-row__inner {
    grid-column: 1 / -1;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 2.25rem;
    padding-top: 0.2rem;
  }

  .activity-more-row__fade {
    position: absolute;
    inset: -1.85rem -0.15rem auto -0.15rem;
    height: 4.1rem;
    background: linear-gradient(
      180deg,
      rgba(255, 253, 248, 0) 0%,
      rgba(252, 248, 240, 0.82) 38%,
      rgba(248, 242, 232, 0.96) 72%,
      rgba(245, 239, 230, 0.99) 100%
    );
    pointer-events: none;
    border-radius: 0 0 var(--ds-radius-md) var(--ds-radius-md);
  }

  .activity-more-btn {
    position: relative;
    z-index: 1;
    pointer-events: auto;
    font-family: var(--sans);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    color: var(--muted);
    background: linear-gradient(180deg, rgba(255, 253, 248, 0.98) 0%, rgba(248, 242, 232, 0.95) 100%);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0.55rem 1.35rem;
    cursor: pointer;
    box-shadow: var(--inset-paper), 0 8px 24px -18px rgba(26, 23, 20, 0.12);
    transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  }

  .activity-more-btn:hover {
    color: var(--accent);
    border-color: rgba(200, 64, 26, 0.35);
    box-shadow: var(--inset-paper), 0 12px 28px -16px rgba(26, 23, 20, 0.14);
    transform: translateY(-1px);
  }

  .activity-more-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
  }

  .activity-more-btn--collapse {
    background: rgba(255, 253, 248, 0.55);
    box-shadow: var(--inset-paper);
  }

  .activity-more-btn--collapse:hover {
    background: rgba(252, 248, 240, 0.95);
  }

  .activity-card.fade-up.activity-card--instant,
  .activity-card.fade-up.activity-card--instant.visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .activity-more-row--collapse {
    margin-top: 0.35rem;
  }

  .activity-more-row--collapse .activity-more-row__inner {
    min-height: 2rem;
    padding-top: 0.35rem;
  }

  .activity-slot__date {
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    color: var(--muted);
    text-align: right;
    padding-top: 0.55rem;
    line-height: 1.35;
  }

  .activity-slot__node-wrap {
    display: flex;
    justify-content: center;
    padding-top: 0.42rem;
  }

  .activity-slot__node {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    border: 2px solid var(--accent);
    background: var(--paper-0);
    box-shadow: 0 0 0 3px rgba(200, 64, 26, 0.1);
    flex-shrink: 0;
    position: relative;
    z-index: 1;
  }

  .activity-slot[data-feed='note'] .activity-slot__node {
    border-color: #1fa889;
    box-shadow: 0 0 0 3px rgba(31, 168, 137, 0.12);
  }

  .activity-slot[data-feed='qiita'] .activity-slot__node {
    border-color: #55c500;
    box-shadow: 0 0 0 3px rgba(85, 197, 0, 0.12);
  }

  .activity-slot[data-feed='github'] .activity-slot__node {
    border-color: #5c534a;
    box-shadow: 0 0 0 3px rgba(92, 83, 74, 0.1);
  }

  .activity-card {
    position: relative;
    display: block;
    margin: 0 0 0 0.35rem;
    padding: 0.95rem 1.1rem 0.85rem;
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--line);
    border-radius: var(--ds-radius-md);
    background: linear-gradient(180deg, rgba(255, 253, 248, 0.88) 0%, rgba(248, 242, 232, 0.52) 100%);
    box-shadow: var(--inset-paper), 0 10px 32px -26px rgba(26, 23, 20, 0.1);
    transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    overflow: visible;
  }

  .activity-card::before {
    content: '';
    position: absolute;
    left: -7px;
    top: 0.65rem;
    width: 12px;
    height: 12px;
    background: linear-gradient(135deg, rgba(255, 253, 248, 0.95) 0%, rgba(248, 242, 232, 0.75) 100%);
    border-left: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    transform: rotate(45deg);
    z-index: 0;
    pointer-events: none;
  }

  .activity-card:hover {
    border-color: rgba(200, 64, 26, 0.28);
    box-shadow: var(--inset-paper), 0 16px 40px -24px rgba(26, 23, 20, 0.14);
    transform: translateY(-1px);
  }

  .activity-card__inner {
    position: relative;
    z-index: 1;
    padding-bottom: 0;
  }

  .activity-card__head {
    display: flex;
    align-items: flex-start;
    gap: 0.55rem;
    margin-bottom: 0.45rem;
  }

  .activity-card__meta {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.22rem;
    min-width: 0;
    flex: 1;
  }

  .activity-card__source {
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.1em;
    color: var(--muted);
    line-height: 1.35;
  }

  .activity-card[data-feed='note'] .activity-card__source {
    color: #158f70;
  }

  .activity-card[data-feed='qiita'] .activity-card__source {
    color: #3d9e00;
  }

  .activity-card[data-feed='github'] .activity-card__source {
    color: #4a5568;
  }

  .activity-card__verb {
    font-family: var(--sans);
    font-size: 0.74rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--ink);
    line-height: 1.35;
  }

  .activity-card__title {
    font-family: var(--serif);
    font-size: 1.02rem;
    font-weight: 600;
    line-height: 1.45;
    letter-spacing: -0.015em;
    margin: 0;
    text-decoration: underline;
    text-decoration-color: rgba(26, 23, 20, 0.18);
    text-underline-offset: 3px;
    transition: color 0.2s ease, text-decoration-color 0.2s ease;
  }

  .activity-card:hover .activity-card__title {
    color: var(--accent);
    text-decoration-color: rgba(200, 64, 26, 0.35);
  }

  .activity-card__ext {
    display: inline-block;
    margin-left: 0.35rem;
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 400;
    color: var(--muted);
    text-decoration: none;
    vertical-align: 0.05em;
  }

  .activity-card:hover .activity-card__ext {
    color: var(--accent);
  }

  .activity-card__foot {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem 0.65rem;
    margin-top: 0.55rem;
    padding-top: 0.55rem;
    border-top: 1px solid var(--line);
    font-family: var(--mono);
    font-size: 0.6rem;
    letter-spacing: 0.06em;
    color: var(--muted);
  }

  .activity-card__foot-tags {
    font-family: var(--sans);
    font-size: 0.72rem;
    letter-spacing: 0.02em;
    color: var(--ds-color-label-secondary);
  }

  @media (max-width: 520px) {
    .activity-year {
      padding-left: 0.85rem;
      padding-right: 0.85rem;
    }

    .activity-year__body {
      --at-date-w: 4.35rem;
      --at-spine-w: 1.35rem;
    }

    .activity-slot__date {
      font-size: 0.62rem;
      padding-top: 0.5rem;
    }

    .activity-card {
      margin-left: 0.1rem;
      padding-left: 0.85rem;
      padding-right: 0.85rem;
    }

    .activity-card__foot {
      margin-left: 0;
      margin-right: 0;
    }

    .activity-card::before {
      left: -6px;
      top: 0.58rem;
    }

    .activity-more-row {
      margin-top: -2rem;
    }

    .activity-more-row__fade {
      inset: -1.55rem -0.1rem auto -0.1rem;
      height: 3.65rem;
    }

    .activity-more-row--collapse {
      margin-top: 0.25rem;
    }
  }

  /* 各社メディアキット（縮小表示のみ） */
  .feed-brand {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border-radius: 10px;
    overflow: hidden;
    background: rgba(255, 253, 248, 0.75);
    border: 1px solid var(--line);
  }

  .feed-brand--lg {
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
  }

  .feed-brand--sm {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    border-radius: 8px;
  }

  .feed-brand img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
  }

  .articles-feed-status {
    font-family: var(--mono);
    font-size: 0.72rem;
    line-height: 1.65;
    color: var(--muted);
    margin: 0 0 var(--ds-space-5);
    max-width: 40rem;
  }

  .articles-feed-status[aria-hidden='true'] {
    display: none;
  }

  .articles-feed-status a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
  }

  .articles-feed-status a:hover {
    color: var(--ds-color-accent-pressed);
  }

  /* ── WORK / 実績 ── */
  .work {
    padding: 8rem 0;
    border-top: 1px solid var(--line);
  }

  .work .section-header {
    margin-bottom: 2rem;
  }

  /* 職務 × 実績を一本の縦タイムラインで接続 */
  .work-timeline {
    margin-top: 0.25rem;
    display: flex;
    flex-direction: column;
  }

  .work-era {
    position: relative;
    padding: 0 0 2.75rem 2rem;
  }

  .work-era:last-child {
    padding-bottom: 0;
  }

  /* ノード＋縦線を同じ X に揃える */
  .work-era::after {
    content: '';
    position: absolute;
    left: 0.55rem;
    top: 0.42rem;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--paper-0);
    border: 2px solid var(--accent);
    transform: translateX(-50%);
    box-shadow: 0 0 0 3px rgba(200, 64, 26, 0.1);
    z-index: 1;
  }

  .work-era:not(:last-child)::before {
    content: '';
    position: absolute;
    left: 0.55rem;
    top: 1.45rem;
    bottom: 0;
    width: 1px;
    background: var(--line);
    transform: translateX(-50%);
  }

  .work-era-head {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.25rem 0.45rem;
    position: relative;
  }

  .work-era-year {
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    color: var(--accent);
  }

  .work-era-sep {
    font-family: var(--mono);
    font-size: 0.68rem;
    color: var(--muted);
    letter-spacing: 0.06em;
  }

  .work-era-title {
    font-family: var(--serif);
    font-size: 1.08rem;
    font-weight: 600;
    margin: 0;
    color: var(--ink);
    line-height: 1.35;
  }

  .work-era-line {
    font-size: 0.84rem;
    line-height: 1.75;
    color: var(--muted);
    margin: 0.4rem 0 1.1rem;
    padding-left: 1.2rem;
    position: relative;
  }

  .work-era-branch {
    position: absolute;
    left: 0;
    top: 0.12em;
    font-family: var(--mono);
    font-size: 0.68rem;
    color: var(--accent);
    opacity: 0.88;
  }

  .work-era-cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-left: 1.2rem;
    border-left: 1px solid rgba(26, 23, 20, 0.12);
    margin-left: 0.32rem;
  }

  .work-card-era {
    font-family: var(--mono);
    font-size: 0.58rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 0.15rem;
  }

  .work-era-cards .work-card {
    padding: 2rem 1.75rem 2.15rem;
    border: 1px solid var(--line);
    border-radius: var(--ds-radius-md);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: linear-gradient(180deg, rgba(255, 253, 248, 0.65) 0%, rgba(248, 242, 232, 0.35) 100%);
    box-shadow: var(--inset-paper);
    transition: background 0.2s ease, box-shadow 0.2s ease;
  }

  .work-era-cards .work-card:hover {
    background: linear-gradient(180deg, rgba(255, 252, 246, 0.88) 0%, rgba(252, 246, 236, 0.55) 100%);
    box-shadow: var(--inset-paper), 0 16px 40px -28px rgba(26, 23, 20, 0.12);
  }

  .work-card-title {
    font-family: var(--serif);
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.45;
    margin: 0;
  }

  .work-card-body {
    font-size: 0.82rem;
    line-height: 1.85;
    color: var(--muted);
  }

  .footer-disclaimer {
    font-family: var(--sans);
    font-size: 0.68rem;
    line-height: 1.65;
    color: var(--muted);
    max-width: 28rem;
    margin-top: 0.75rem;
  }

  /* ── SKILLS SECTION ── */
  .skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-paper);
    border-radius: 2px;
    overflow: hidden;
  }

  .skill-group {
    padding: 3rem;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(255, 253, 248, 0.55) 0%, rgba(248, 242, 232, 0.28) 100%);
    box-shadow: var(--inset-paper);
    transition: background 0.2s ease;
  }

  .skill-group:hover {
    background: linear-gradient(180deg, rgba(255, 252, 246, 0.75) 0%, rgba(252, 246, 236, 0.45) 100%);
  }

  .skill-group:nth-child(2n) { border-right: none; }
  .skill-group:nth-last-child(-n+2) { border-bottom: none; }

  /* 4+1（資格フル幅）レイアウト：2行目右カードは下線を残す */
  .skills-grid:has(.skill-group:nth-child(5):last-child) .skill-group:nth-last-child(2):nth-child(4) {
    border-bottom: 1px solid var(--line);
  }

  /* スキル枠が奇数個のとき、最下行の右空白を防ぐ */
  .skill-group:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    border-right: none;
  }

  .skill-group-title {
    font-family: var(--mono);
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    text-transform: none;
    color: var(--accent);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    font-weight: 500;
  }

  .skill-group-title::before {
    content: '';
    width: 11px;
    height: 11px;
    border-radius: 3px;
    flex-shrink: 0;
    box-shadow: 0 0 0 1px rgba(26, 23, 20, 0.06);
  }

  .skill-group--core .skill-group-title::before { background: linear-gradient(145deg, #5b8fd4, #3d6eb0); }
  .skill-group--infra .skill-group-title::before { background: linear-gradient(145deg, #e88a3a, #c86a22); }
  .skill-group--ai .skill-group-title::before { background: linear-gradient(145deg, #a78bfa, #7c5cdb); }
  .skill-group--design .skill-group-title::before { background: linear-gradient(145deg, #f472b0, #db4a8a); }
  .skill-group--certs .skill-group-title::before {
    background: linear-gradient(145deg, #c8e632, #9cb82a);
    border-radius: 50%;
  }

  .skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.42rem;
    font-family: var(--mono);
    font-size: 0.72rem;
    padding: 0.35rem 0.8rem;
    border: 1px solid var(--line);
    color: var(--ink);
    background: rgba(255, 253, 248, 0.35);
    transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
    cursor: default;
  }

  .skill-tag__icon {
    width: 1.05rem;
    height: 1.05rem;
    object-fit: contain;
    flex-shrink: 0;
  }

  .skill-tag__iconpair {
    display: inline-flex;
    align-items: center;
    gap: 0.1rem;
    flex-shrink: 0;
  }

  .skill-tag__iconpair .skill-tag__icon {
    width: 0.92rem;
    height: 0.92rem;
  }

  .skill-tag__text {
    line-height: 1.25;
  }

  .skill-tag:hover {
    background: rgba(252, 248, 240, 0.95);
    color: var(--ink);
    border-color: rgba(200, 64, 26, 0.38);
    box-shadow: 0 6px 18px -10px rgba(26, 23, 20, 0.12);
  }

  .skill-tag:hover .skill-tag__icon {
    filter: none;
  }

  /* ── CONTACT SECTION ── */
  .contact {
    position: relative;
    overflow: hidden;
    background: linear-gradient(172deg, #222019 0%, var(--ink) 45%, #100e0c 100%);
    color: var(--paper);
    padding: 8rem 0;
    text-align: center;
  }

  .contact::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='cn'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.72' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23cn)' opacity='0.05'/%3E%3C/svg%3E");
    mix-blend-mode: overlay;
    opacity: 0.45;
    pointer-events: none;
    z-index: 0;
  }

  .contact .container {
    position: relative;
    z-index: 1;
  }

  .contact .section-num { color: var(--accent); }
  .contact .section-title { color: var(--paper); }

  .contact-desc {
    font-size: 0.92rem;
    line-height: 1.9;
    color: rgba(245,240,232,0.52);
    max-width: 26rem;
    margin: var(--ds-space-7) auto var(--ds-space-5);
    text-align: center;
  }

  .contact-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
  }

  .contact-link {
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    padding: 1rem 2rem;
    border: 1px solid rgba(245,240,232,0.2);
    color: var(--paper);
    text-decoration: none;
    transition: all 0.2s;
  }

  .contact-link:hover {
    background: var(--accent);
    border-color: var(--accent);
  }

  .contact-form-wrap {
    max-width: 28rem;
    margin: var(--ds-space-6) auto 0;
    padding: 0 var(--ds-space-4);
    text-align: left;
  }

  .contact-form-heading {
    font-family: var(--serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--paper);
    letter-spacing: -0.02em;
    margin-bottom: var(--ds-space-3);
    text-align: center;
  }

  .contact-form-lead {
    font-size: 0.875rem;
    line-height: 1.55;
    color: rgba(245, 240, 232, 0.55);
    margin-bottom: var(--ds-space-5);
    text-align: center;
  }

  .contact-form-status {
    min-height: 1.5rem;
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: var(--ds-space-4);
    color: rgba(245, 240, 232, 0.85);
  }

  .contact-form-status.is-success {
    color: rgba(180, 220, 190, 0.95);
  }

  .contact-form-status.is-error {
    color: rgba(255, 180, 170, 0.95);
  }

  .contact-form .field {
    margin-bottom: var(--ds-space-5);
  }

  .contact-form .field-label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: rgba(245, 240, 232, 0.72);
    margin-bottom: var(--ds-space-2);
    letter-spacing: 0.03em;
  }

  .contact-form .field-input,
  .contact-form .field-textarea {
    width: 100%;
    font-family: var(--sans);
    font-size: 1rem;
    line-height: 1.45;
    padding: var(--ds-space-3) var(--ds-space-4);
    border-radius: var(--ds-radius-md);
    border: 1px solid rgba(245, 240, 232, 0.22);
    background: rgba(255, 255, 255, 0.06);
    color: var(--paper);
    transition: border-color var(--ds-duration-fast) var(--ds-ease-standard),
      box-shadow var(--ds-duration-fast) var(--ds-ease-standard);
  }

  .contact-form .field-textarea {
    min-height: 8.5rem;
    resize: vertical;
  }

  .contact-form .field-input::placeholder,
  .contact-form .field-textarea::placeholder {
    color: rgba(245, 240, 232, 0.35);
  }

  .contact-form .field-input:focus-visible,
  .contact-form .field-textarea:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(200, 64, 26, 0.35);
  }

  .contact-form-submit {
    width: 100%;
    min-height: 48px;
    margin-top: var(--ds-space-2);
    font-family: var(--mono);
    font-size: 0.8125rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: var(--ds-space-3) var(--ds-space-5);
    border-radius: var(--ds-radius-md);
    border: 1px solid rgba(245, 240, 232, 0.25);
    background: rgba(255, 255, 255, 0.08);
    color: var(--paper);
    cursor: pointer;
    transition: background var(--ds-duration-fast) var(--ds-ease-standard),
      border-color var(--ds-duration-fast) var(--ds-ease-standard),
      opacity var(--ds-duration-fast) var(--ds-ease-standard);
  }

  .contact-form-submit:hover:not(:disabled) {
    background: var(--accent);
    border-color: var(--accent);
  }

  .contact-form-submit:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(200, 64, 26, 0.45);
  }

  .contact-form-submit:disabled {
    opacity: 0.45;
    cursor: not-allowed;
  }

  .contact-form-honeypot {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  /* ── FOOTER ── */
  footer {
    padding: 2rem 3rem;
    border-top: 1px solid var(--line);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 1.5rem;
    background: linear-gradient(180deg, var(--paper-0) 0%, var(--paper) 100%);
    box-shadow: 0 -16px 48px -36px rgba(26, 23, 20, 0.08);
  }

  .footer-col {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: min(100%, 18rem);
  }

  .footer-copy {
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.12em;
    color: var(--muted);
  }

  .footer-links {
    display: flex;
    gap: 2rem;
  }

  .footer-links a {
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.12em;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
  }

  .footer-links a:hover { color: var(--ink); }

  /* ── ANIMATIONS ── */
  .fade-up {
    opacity: 0;
    transform: translateY(48px) scale(0.96);
    transition:
      opacity 0.85s cubic-bezier(0.22, 1, 0.36, 1),
      transform 0.85s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: opacity, transform;
  }

  .fade-up.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
  }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }

    .fade-up,
    .fade-up.visible {
      opacity: 1;
      transform: none;
      transition: none;
    }

    .nav-links {
      transition: none;
    }

    .activity-card,
    .activity-more-btn,
    .chapter-item .chapter-arrow {
      transition: none;
    }

    .nav-links a:hover,
    .hero-cta:hover,
    .hero-cta:active,
    .chapter-item:hover,
    .activity-card:hover,
    .activity-more-btn:hover,
    .activity-more-btn--collapse:hover {
      transform: none;
    }

    body::before,
    body::after {
      transform: none !important;
    }
  }

  /* ── MOBILE ── */
  @media (max-width: 768px) {
    /*
     * ヘッダー nav に backdrop-filter があると、多くの UA で子の position:fixed の
     * 包含ブロックが nav になり、全画面メニューがヘッダー高さに閉じて背景外にリンクだけが残る。
     * モバイルは不透明の紙面（トークン）に切り替え、オーバーレイはビューポート全面で塗る。
     */
    nav {
      padding: max(0.85rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) 0.85rem max(1rem, env(safe-area-inset-left));
      backdrop-filter: none;
      -webkit-backdrop-filter: none;
      background: linear-gradient(180deg, var(--paper-0) 0%, var(--paper-1) 100%);
      box-shadow: var(--glass-highlight), 0 8px 28px -18px rgba(26, 23, 20, 0.08);
    }

    body.nav-open nav {
      z-index: 150;
    }

    .nav-logo {
      position: relative;
      z-index: 120;
      font-size: 1.05rem;
    }

    .nav-toggle {
      display: inline-flex;
      font-size: 0.58rem;
      letter-spacing: 0.1em;
      padding: 0 10px;
    }

    .nav-links {
      position: fixed;
      inset: 0;
      z-index: 110;
      display: flex;
      flex-direction: column;
      align-items: stretch;
      justify-content: flex-start;
      gap: 0;
      padding: max(5.25rem, calc(env(safe-area-inset-top) + 4.25rem)) max(1.5rem, env(safe-area-inset-right)) max(2rem, env(safe-area-inset-bottom)) max(1.5rem, env(safe-area-inset-left));
      margin: 0;
      list-style: none;
      background-color: var(--paper-0);
      background-image: linear-gradient(180deg, var(--paper-0) 0%, var(--paper-1) 100%);
      min-height: 100vh;
      min-height: 100dvh;
      min-height: -webkit-fill-available;
      overscroll-behavior: contain;
      box-shadow: inset 0 0 0 1px rgba(26, 23, 20, 0.05);
      backdrop-filter: none;
      -webkit-backdrop-filter: none;
      border-bottom: none;
      transform: translateX(100%);
      visibility: hidden;
      transition: transform 0.35s ease, visibility 0.35s;
    }

    .nav-links.is-open {
      transform: translateX(0);
      visibility: visible;
    }

    .nav-links li {
      border-bottom: 1px solid var(--line);
    }

    .nav-links a {
      display: block;
      padding: 1rem 0;
      font-size: 0.8rem;
    }

    .hero {
      grid-template-columns: 1fr;
      min-height: auto;
    }

    .hero-left {
      justify-content: flex-start;
      padding: 6.5rem max(1.25rem, env(safe-area-inset-left)) 2.25rem max(1.25rem, env(safe-area-inset-right));
      border-right: none;
      border-bottom: 1px solid var(--line);
    }

    .hero-right {
      padding: 7rem max(1.25rem, env(safe-area-inset-left)) 5rem max(1.25rem, env(safe-area-inset-right));
    }

    .hero-name {
      font-size: clamp(2.85rem, 13vw, 4rem);
    }

    .hero-name-en {
      margin-bottom: 1.35rem;
      letter-spacing: 0.22em;
    }

    .hero-tag {
      font-size: 0.58rem;
      letter-spacing: 0.08em;
      padding: 0.45rem 0.75rem 0.45rem 0.65rem;
      line-height: 1.45;
      white-space: normal;
      flex-wrap: wrap;
      row-gap: 0.2rem;
      margin-bottom: 1.35rem;
    }

    .hero-pitch {
      font-size: clamp(1rem, 4.6vw, 1.18rem);
      line-height: 1.45;
      margin-bottom: 0.6rem;
    }

    .hero-pitch-sub {
      font-size: 0.84rem;
      line-height: 1.65;
      margin-bottom: 1rem;
    }

    .hero-desc {
      font-size: 0.84rem;
      line-height: 1.68;
      padding-left: 1rem;
      margin-bottom: 1rem;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem 2rem;
      max-width: 100%;
    }

    .work-era {
      padding-left: 1.65rem;
    }

    .work-era::after,
    .work-era:not(:last-child)::before {
      left: 0.48rem;
    }

    .work-era-cards {
      padding-left: 0.85rem;
    }

    footer {
      flex-direction: column;
      align-items: flex-start;
      padding: 1.5rem max(1rem, env(safe-area-inset-left)) 2rem max(1rem, env(safe-area-inset-right));
      gap: 1rem;
    }

    .footer-links {
      flex-wrap: wrap;
      justify-content: flex-start;
      gap: 0.5rem 1rem;
      max-width: 100%;
    }

    .footer-links a {
      white-space: nowrap;
      font-size: 0.58rem;
      letter-spacing: 0.08em;
    }

    .story-grid { grid-template-columns: 1fr; gap: 3rem; }
    .story-timeline { position: static; }

    .skills-grid { grid-template-columns: 1fr; }
    .skill-group { border-right: none !important; }

    .container {
      padding: 0 max(var(--ds-space-5), env(safe-area-inset-right)) 0 max(var(--ds-space-5), env(safe-area-inset-left));
    }

    section {
      padding: var(--ds-section-pad-y-md) 0;
    }

    .section-ornament {
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

  }
  main { display: block; }

  body.nav-open {
    overflow: hidden;
  }