@media (max-width: 900px) {
  body { overflow-x: hidden; }
  .mobile-topbar {
    position: fixed;
    inset: 0 0 auto;
    z-index: 40;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-bottom: 1px solid var(--line-soft);
    background: rgba(250, 249, 244, 0.9);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }
  .mobile-brand { display: flex; align-items: center; gap: 10px; color: var(--text); }
  .mobile-brand span {
    display: grid;
    width: 34px;
    height: 34px;
    place-items: center;
    border-radius: 7px;
    background: var(--accent);
    color: #fff;
    font-weight: 900;
  }
  .menu-button {
    display: grid;
    width: 44px;
    height: 44px;
    place-items: center;
    border: 0;
    background: transparent;
  }
  .menu-button span { display: block; width: 24px; height: 2px; margin: 3px; background: var(--text); }
  .identity-sidebar {
    width: min(82vw, 310px);
    transform: translateX(-100%);
    transition: transform 0.22s ease;
  }
  .identity-sidebar.is-open { transform: translateX(0); }
  .sidebar-backdrop.is-open {
    position: fixed;
    inset: 0;
    z-index: 20;
    display: block;
    background: rgba(17, 24, 39, 0.42);
  }
  .content-canvas { height: auto; min-height: 100dvh; margin-left: 0; overflow: visible; }
  .content-inner { width: min(calc(100% - 32px), 680px); padding: 98px 0 52px; }
  .section-anchor { scroll-margin-top: 82px; }
  .hero-panel h2 {
    font-size: clamp(34px, 9.2vw, 46px);
    line-height: 1.16;
  }
  .hero-subtitle { display: block; }
  .hero-subtitle span { display: block; }
  .metric-grid, .qa-grid, .capability-grid, .fusion-grid, .portfolio-grid, .hobby-grid { grid-template-columns: 1fr; }
  .proof-tags { gap: 8px; margin-top: 22px; }
  .proof-tags span { min-height: 32px; font-size: 12px; }
  .metric-grid { gap: 12px; margin: 34px 0 28px; }
  .metric-grid article { min-height: 92px; padding: 20px; }
  .summary-card { padding: 24px 20px; }
  .summary-card p:last-child { font-size: 16px; line-height: 1.75; }
  .timeline-list { gap: 32px; }
  .timeline-list::before { left: 7px; }
  .timeline-list article { grid-template-columns: 1fr; gap: 10px; padding-left: 30px; }
  .timeline-list time { text-align: left; }
  .timeline-list div::before { left: -29px; top: 6px; }
  .section-title { gap: 16px; margin-bottom: 30px; }
  .section-title h2 { font-size: 30px; }
  .capability-grid article { padding: 22px; }
  .fusion-grid article { padding: 22px; }
  .fusion-grid h3 { font-size: 23px; }
  .proof-strip { grid-template-columns: 1fr; gap: 6px; }
  .section-lead { margin-top: -16px; font-size: 16px; }
  .hobby-entry { grid-template-columns: 1fr; }
  .hobby-entry-copy {
    min-height: auto;
    padding: 24px 20px;
  }
  .hobby-entry-copy h3 { font-size: clamp(26px, 7.5vw, 34px); }
  .hobby-primary-action {
    width: 100%;
    min-height: 50px;
  }
  .hobby-entry-media,
  .hobby-entry-media img {
    min-height: 220px;
  }
  .hobby-grid { gap: 14px; }
  .hobby-grid article {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 12px;
    padding: 12px;
  }
  .hobby-grid img { min-height: 112px; }
  .hobby-grid h3 { font-size: 18px; }
  .hobby-grid span { font-size: 13px; }
}

@media (max-width: 420px) {
  .hero-panel h2 { font-size: clamp(32px, 8.8vw, 38px); }
  .hobby-grid article { grid-template-columns: 104px minmax(0, 1fr); }
  .hobby-grid img { min-height: 104px; }
}

@media print {
  .mobile-topbar, .identity-sidebar, .sidebar-backdrop { display: none !important; }
  .content-canvas { height: auto; margin-left: 0; overflow: visible; }
  .content-inner { width: 100%; padding: 0; }
}