:root {
    --bg: #f0eeea;
    --bg-soft: #e4e1da;
    --bg-grid: rgba(20, 21, 26, 0.04);
    --paper: #ffffff;
    --paper-inset: #e4e1da;
    --ink: #141414;
    --ink-soft: #525252;
    --ink-faint: #8a8a8a;
    --line: #ddd9d2;
    --line-soft: color-mix(in srgb, #ddd9d2 75%, transparent);
    --accent: #141414;
    --shadow: 0 1px 0 rgba(20, 21, 26, 0.04);
    --radius: 12px;
    --header-h: 56px;
    --safe-top: env(safe-area-inset-top, 0px);
    --text-xs: 12px;
    --text-sm: 14px;
    --text-base: 16px;
    --text-md: 18px;
    --text-lg: 20px;
    color-scheme: light;
  }
  :root[data-theme="dark"] {
    --bg: #1a1917;
    --bg-soft: #141311;
    --bg-grid: rgba(255, 255, 255, 0.035);
    --paper: #242220;
    --paper-inset: #2e2c29;
    --ink: #f0eeea;
    --ink-soft: #a3a3a3;
    --ink-faint: #8a8680;
    --line: #3f3c37;
    --line-soft: color-mix(in srgb, #3f3c37 80%, transparent);
    --accent: #f0eeea;
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }

  * { box-sizing: border-box; }
  html {
    scroll-behavior: smooth;
    background: var(--bg);
  }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: 'Inter', 'Segoe UI', sans-serif;
    font-size: var(--text-base);
    line-height: 1.6;
    font-weight: 400;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    transition: background-color .25s ease, color .25s ease;
  }
  a { color: inherit; }
  h1, h2, h3 { font-family: 'Inter', sans-serif; margin: 0; font-weight: 700; }
  .wrap { max-width: 1180px; margin: 0 auto; padding: 0 28px; }
  @media (max-width: 640px) { .wrap { padding: 0 16px; } }

  /* ---------- top bar (hide on scroll down) ---------- */
  .topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 40;
    height: calc(var(--header-h) + var(--safe-top));
    padding-top: var(--safe-top);
    background: color-mix(in srgb, var(--bg) 90%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line-soft);
    transform: translateY(0);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .topbar.is-hidden {
    transform: translateY(-100%);
  }
  .topbar.is-instant {
    transition: none !important;
  }
  .topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
  }
  .mark {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: var(--text-sm);
    font-weight: 600;
    letter-spacing: -0.01em;
    text-decoration: none;
  }
  .mark .chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1.5px solid var(--accent);
    color: var(--accent);
  }
  .mark .chip svg {
    width: 13px;
    height: 13px;
    display: block;
  }
  .mark .name {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--ink);
  }

  .topbar-right { display: flex; align-items: center; gap: 14px; }
  .contact-icons { display: flex; gap: 6px; }
  .contact-icons a {
    display: flex;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
    color: var(--ink-soft);
    border-radius: 50%;
    transition: color .15s ease, background-color .15s ease;
  }
  .contact-icons a:hover { color: var(--ink); background: var(--line-soft); }
  .contact-icons svg { width: 16px; height: 16px; }
  .contact-icons .icon-devto { width: 22px; height: 22px; }
  .contact-icons .icon-devto .dev-label { fill: var(--bg); }

  .theme-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--ink-soft);
    cursor: pointer;
    flex-shrink: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
    transition: color .15s ease;
  }
  .theme-btn:hover,
  .theme-btn:active,
  .theme-btn:focus {
    background: transparent;
    color: var(--ink);
  }
  @media (hover: hover) and (pointer: fine) {
    .theme-btn:hover { color: var(--ink); }
  }
  .theme-btn:focus-visible {
    outline: 2px solid var(--ink);
    outline-offset: 2px;
  }
  .theme-btn:focus:not(:focus-visible) {
    outline: none;
  }
  .theme-btn svg {
    width: 20px;
    height: 20px;
    display: block;
  }
  .theme-btn .icon-sun { display: none; }
  .theme-btn .icon-moon { display: block; }
  :root[data-theme="dark"] .theme-btn .icon-sun { display: block; }
  :root[data-theme="dark"] .theme-btn .icon-moon { display: none; }

  /* space for fixed header only */
  .top-spacer {
    height: calc(var(--header-h) + var(--safe-top));
  }

  /* ---------- hero ---------- */
  .hero {
    padding: 28px 0 20px;
    border-bottom: 1px solid var(--line-soft);
  }
  .hero-sub {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px 12px;
    margin-top: 2px;
  }
  .hero-toggle {
    display: none;
  }
  h1.name {
    font-family: 'Inter', sans-serif;
    font-size: clamp(1.75rem, 3vw, 2rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin: 0;
  }
  .role-line {
    font-size: var(--text-md);
    color: var(--ink-soft);
    font-weight: 400;
    margin: 0;
  }
  .stack-sheet {
    margin-top: 14px;
  }
  .stack-sheet-backdrop,
  .stack-sheet-head {
    display: none;
  }
  .stack-sheet-panel {
    background: transparent;
  }
  .tech-stack {
    display: flex;
    flex-direction: column;
    gap: 5px;
    max-width: 48rem;
  }
  .tech-group {
    display: grid;
    grid-template-columns: 7.75rem minmax(0, 1fr);
    align-items: baseline;
    column-gap: 14px;
    row-gap: 2px;
  }
  .tech-label {
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--accent);
    line-height: 1.45;
  }
  .tech-items {
    margin: 0;
    font-size: var(--text-sm);
    font-weight: 400;
    color: var(--ink);
    line-height: 1.45;
  }
  .tech-items a {
    color: inherit;
    font-weight: 400;
    text-decoration: none;
    border-bottom: 1px solid color-mix(in srgb, var(--ink-faint) 55%, transparent);
    padding-bottom: 1px;
  }
  .tech-items a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }

  @media (max-width: 900px) and (min-width: 641px) {
    .tech-group {
      grid-template-columns: 7.25rem minmax(0, 1fr);
    }
  }

  /* ---------- filter bar (after hero, above projects) ---------- */
  .filterbar {
    position: sticky;
    top: calc(var(--header-h) + var(--safe-top));
    z-index: 35;
    margin-top: 4px;
  }
  .filterbar-slide {
    background: color-mix(in srgb, var(--bg) 94%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: none;
    padding: 12px 0 10px;
    transform: translateY(0);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .filterbar.is-hidden .filterbar-slide {
    transform: translateY(calc(-100% - var(--header-h) - var(--safe-top)));
    pointer-events: none;
  }
  .filterbar.is-instant .filterbar-slide {
    transition: none !important;
  }

  .filterbar-inner {
    display: block;
  }

  .categories-row {
    display: flex;
    align-items: center;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    overscroll-behavior-x: contain;
    gap: 8px;
  }
  .categories-row::-webkit-scrollbar {
    display: none;
  }
  .categories-list {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 8px;
    flex: 0 0 auto;
  }
  .cat-chip {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    box-sizing: border-box;
    min-height: 34px;
    padding: 0 13px;
    background: var(--paper);
    border: 1.5px solid var(--line);
    border-radius: 999px;
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--ink-soft);
    cursor: pointer;
    transition: border-color .15s ease, background .15s ease, color .15s ease;
    font-family: inherit;
    white-space: nowrap;
  }
  .cat-chip:hover {
    border-color: var(--ink-soft);
    color: var(--ink);
  }
  .cat-chip.is-active {
    background: var(--paper-inset);
    border-color: var(--ink-soft);
    color: var(--ink);
  }
  .cat-chip.is-active:hover {
    background: var(--paper-inset);
    border-color: var(--ink);
    color: var(--ink);
  }

  /* ---------- grid ---------- */
  .grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 10px 0 64px;
  }

  .card {
    position: relative;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--paper);
    overflow: hidden;
    display: flex;
    flex-direction: row;
    box-shadow: 0 1px 2px rgba(40,32,24,0.04);
    transform: none;
    transition: none;
    content-visibility: auto;
    contain-intrinsic-size: auto 180px;
  }
  .card:hover {
    transform: none;
    box-shadow: 0 1px 2px rgba(40,32,24,0.04);
  }
  @media (max-width: 640px) {
    .card { flex-direction: column; }
  }

  .card-media {
    position: relative;
    background: #ffffff;
    border-bottom: 1px solid var(--line-soft);
    flex: 0 0 220px;
    width: 220px;
    min-height: 168px;
    align-self: stretch;
    border-right: 1px solid var(--line-soft);
    overflow: hidden;
  }
  .card-pin {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--ink-faint);
    pointer-events: none;
    transform: rotate(28deg);
    line-height: 0;
  }
  .card-media a,
  .card-media > div {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .card-media a { cursor: pointer; }
  .card-media img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    padding: 14px;
    opacity: 0;
    transition: opacity .35s ease;
    position: relative;
    z-index: 2;
    background: transparent;
  }
  .card-media img.is-loaded {
    opacity: 1;
  }
  /* skeleton */
  .card-media::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
      90deg,
      var(--paper-inset) 0%,
      color-mix(in srgb, var(--ink-faint) 12%, var(--paper-inset)) 50%,
      var(--paper-inset) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shine 1.4s ease-in-out infinite;
    z-index: 1;
  }
  .card-media.has-image::before {
    opacity: 0;
    pointer-events: none;
    transition: opacity .3s ease;
  }
  @keyframes skeleton-shine {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
  }
  @media (prefers-reduced-motion: reduce) {
    .card-media::before { animation: none; }
    .card-media img { transition: none; }
    html { scroll-behavior: auto; }
  }
  @media (max-width: 640px) {
    .card-media {
      flex: 0 0 auto;
      width: 100%;
      height: 148px;
      min-height: 148px;
      border-right: none;
    }
  }

  .card-body {
    padding: 15px 17px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
  }
  .card-title {
    font-size: var(--text-md);
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: -0.01em;
  }
  .card-title a { text-decoration: none; transition: color .15s ease; cursor: pointer; }
  .card-title a:hover { color: var(--ink-soft); }
  .card-title span { cursor: default; }
  .card-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 10px 16px;
  }
  .card-head .card-title {
    margin: 0;
    min-width: 0;
    flex: 1 1 auto;
  }
  .card-head-end {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex: 0 0 auto;
  }
  .card-date {
    margin: 0;
    font-size: var(--text-xs);
    font-weight: 400;
    color: var(--ink-faint);
    letter-spacing: 0.01em;
    white-space: nowrap;
  }
  .card-detail {
    color: var(--ink-soft);
    font-size: var(--text-sm);
    line-height: 1.55;
    margin-top: 6px;
  }
  .card-detail p { margin: 0 0 4px; }
  .card-detail p:last-child { margin-bottom: 0; }

  .card-info {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: auto;
    padding-top: 10px;
  }
  .card-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: auto 0 0;
    padding-top: 10px;
  }
  .card-tech {
    display: inline-flex;
    align-items: center;
    font-size: var(--text-xs);
    line-height: 1.2;
    color: var(--ink-soft);
    background: color-mix(in srgb, var(--paper-inset) 45%, var(--paper));
    border: 0;
    border-radius: 999px;
    padding: 4px 10px;
    font-weight: 500;
  }
  .info-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: var(--text-xs);
    color: var(--ink-soft);
    background: var(--paper-inset);
    border-radius: 999px;
    padding: 4px 10px;
    font-weight: 500;
  }
  .info-badge svg {
    width: 12px;
    height: 12px;
    flex-shrink: 0;
    color: var(--ink-faint);
  }

  .card-links {
    border-radius: 8px;
    border: 1px solid transparent;
    background: transparent;
    transition: background .25s ease, border-color .25s ease;
    margin: 0 -4px;
    padding: 0 4px;
  }
  .card-links[open],
  .card-links.is-open {
    background: var(--paper-inset);
    border-color: var(--line);
  }
  .card-links summary {
    cursor: pointer;
    font-size: var(--text-xs);
    color: var(--ink-soft);
    list-style: none;
    padding: 6px 4px;
    margin: 0 -4px;
    border-radius: 7px;
    font-weight: 500;
    transition: color .2s ease, background .2s ease;
    user-select: none;
  }
  .card-links summary:hover {
    color: var(--ink);
    background: color-mix(in srgb, var(--ink-faint) 8%, transparent);
  }
  .card-links[open] summary,
  .card-links.is-open summary {
    color: var(--ink);
    font-weight: 600;
  }
  .card-links summary::-webkit-details-marker { display: none; }
  .card-links summary:before { content: '+ '; }
  .card-links[open] summary:before,
  .card-links.is-open summary:before { content: '− '; }
  .card-links-panel {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows .32s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .card-links.is-open .card-links-panel {
    grid-template-rows: 1fr;
  }
  .card-links-list {
    overflow: hidden;
    min-height: 0;
    margin-top: 0;
    padding: 0 4px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    opacity: 0;
    transition: opacity .22s ease, padding .22s ease;
  }
  .card-links.is-open .card-links-list {
    opacity: 1;
    margin-top: 4px;
    padding-bottom: 8px;
    max-height: 180px;
    overflow-y: auto;
  }
  .card-links-list a {
    font-size: var(--text-xs);
    color: var(--ink-soft);
    text-decoration: none;
    padding: 3px 0;
    border-bottom: 1px dashed var(--line-soft);
  }
  .card-links-list a:hover { color: var(--ink); }
  @media (prefers-reduced-motion: reduce) {
    .card-links,
    .card-links summary,
    .card-links-panel,
    .card-links-list { transition: none; }
  }

  .empty-state {
    text-align: center;
    padding: 64px 20px;
    color: var(--ink-faint);
    font-size: var(--text-sm);
  }

  /* ---------- project detail ---------- */
  .detail-view { padding: 8px 0 48px; }
  .detail-inner { max-width: 720px; }
  .detail-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 18px;
    padding: 0;
    border: 0;
    background: none;
    color: var(--accent);
    font: inherit;
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
  }
  .detail-back:hover { text-decoration: underline; }

  .detail-header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px 20px;
    margin-bottom: 22px;
  }
  .detail-title {
    margin: 0 0 4px;
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
  }
  .detail-meta {
    margin: 0;
    color: var(--ink-soft);
    font-size: var(--text-sm);
  }
  .detail-actions {
    display: flex;
    flex-wrap: nowrap;
    gap: 6px;
    align-items: stretch;
  }
  .btn-demo,
  .btn-github {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 1 auto;
    min-width: 0;
    min-height: 36px;
    padding: 7px 10px;
    border-radius: 8px;
    font-size: var(--text-xs);
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    transition: background-color .15s ease, border-color .15s ease, filter .15s ease;
  }
  .btn-demo {
    background: var(--paper);
    color: var(--ink);
    border: 1px solid var(--line);
  }
  .btn-demo:hover {
    filter: none;
    border-color: var(--ink-soft);
    background: var(--paper-inset);
  }
  .btn-github {
    background: var(--paper);
    color: var(--ink);
    border: 1px solid var(--line);
  }
  .btn-github:hover {
    border-color: var(--ink-soft);
    background: var(--paper-inset);
  }

  .gallery-section { margin-bottom: 28px; }
  .gallery-main {
    position: absolute;
    inset: 0;
    background: transparent;
    cursor: zoom-in;
    border: 0;
    padding: 0;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
  }
  .gallery-main.is-video {
    cursor: default;
    background: #111;
  }
  .gallery-stack {
    position: relative;
    width: 100%;
    height: 100%;
  }
  .gallery-video-layer {
    display: none;
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #111;
    z-index: 1;
  }
  .gallery-video-layer.is-show {
    display: block;
  }
  .gallery-video-cover {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 0;
    padding: 0;
    cursor: pointer;
    background: color-mix(in srgb, #000 55%, transparent);
    transition: background .2s ease;
  }
  .gallery-video-cover:hover {
    background: color-mix(in srgb, #000 62%, transparent);
  }
  .gallery-video-cover:hover .gallery-video-play {
    transform: scale(1.05);
    background: color-mix(in srgb, #000 38%, transparent);
  }
  .gallery-video-cover[hidden] {
    display: none !important;
  }
  .gallery-video-play {
    width: 58px;
    height: 58px;
    border-radius: 50%;
    background: color-mix(in srgb, #000 40%, transparent);
    border: 1.5px solid color-mix(in srgb, #fff 50%, transparent);
    box-shadow: 0 2px 14px rgba(0, 0, 0, 0.25);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: color-mix(in srgb, #fff 92%, transparent);
    padding-left: 2px;
    transition: transform .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
  }
  .gallery-video-play svg {
    display: block;
  }
  .gallery-thumb.is-video {
    position: relative;
  }
  .gallery-thumb-play {
    position: absolute;
    inset: 0;
    margin: auto;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: color-mix(in srgb, #000 55%, transparent);
    pointer-events: none;
  }
  .gallery-thumb-play::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 6px;
    border-style: solid;
    border-width: 5px 0 5px 8px;
    border-color: transparent transparent transparent #fff;
  }
  .gallery-head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-start;
    gap: 10px 16px;
    margin-bottom: 12px;
  }
  .gallery-device {
    display: inline-flex;
    padding: 0;
    gap: 2px;
  }
  .gallery-device-btn {
    appearance: none;
    border: 0;
    outline: none;
    background: transparent;
    color: var(--ink-faint);
    font: inherit;
    font-size: var(--text-xs);
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: color .18s ease, opacity .18s ease;
  }
  .gallery-device-btn svg {
    flex: 0 0 auto;
    opacity: 0.75;
  }
  .gallery-device-btn:hover {
    color: var(--ink-soft);
  }
  .gallery-device-btn:hover svg {
    opacity: 0.9;
  }
  .gallery-device-btn.is-active {
    color: var(--accent);
    font-weight: 700;
  }
  .gallery-device-btn.is-active svg {
    color: var(--accent);
    opacity: 1;
    stroke-width: 2.35;
  }
  .gallery {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 28px;
  }
  .gallery-stage {
    position: relative;
    aspect-ratio: 16 / 10;
    min-height: 200px;
    background: #fff;
  }
  .gallery-stage.is-loading {
    aspect-ratio: 16 / 10;
  }
  .gallery-stage.is-loading::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    background: linear-gradient(
      90deg,
      var(--paper-inset) 0%,
      color-mix(in srgb, var(--ink-faint) 14%, var(--paper-inset)) 50%,
      var(--paper-inset) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shine 1.4s ease-in-out infinite;
  }
  .gallery-stage.is-loading .gallery-layer.is-show {
    opacity: 0;
  }
  .gallery-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    width: 34px;
    height: 34px;
    border: 0;
    border-radius: 50%;
    background: color-mix(in srgb, #000 28%, transparent);
    color: #fff;
    font-size: 1.35rem;
    line-height: 1;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
    transition: background .15s ease;
  }
  .gallery-nav:hover {
    background: color-mix(in srgb, #000 42%, transparent);
    color: #fff;
  }
  .gallery-prev { left: 8px; }
  .gallery-next { right: 8px; }
  .gallery-layer {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
    z-index: 0;
    background: #fff;
  }
  .gallery-layer.is-show {
    position: absolute;
    inset: 0;
    opacity: 1;
    z-index: 1;
  }
  .gallery-layer:not(.is-show) {
    position: absolute;
    inset: 0;
  }
  @media (prefers-reduced-motion: reduce) {
    .gallery-layer { transition: none; }
  }
  .gallery-thumbs {
    display: flex;
    gap: 8px;
    padding: 16px 12px 12px;
    border-top: 1px solid var(--line-soft);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--ink-faint) 10%, transparent) transparent;
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
  }
  .gallery-thumbs::-webkit-scrollbar {
    height: 2px;
  }
  .gallery-thumbs::-webkit-scrollbar-track {
    background: transparent;
  }
  .gallery-thumbs::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--ink-faint) 10%, transparent);
    border-radius: 999px;
  }
  .gallery-thumbs::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--ink-faint) 28%, transparent);
  }
  .gallery-thumbs.is-dragging {
    cursor: grabbing;
    scroll-behavior: auto;
  }
  .gallery-thumbs.is-dragging .gallery-thumb {
    pointer-events: none;
  }
  .gallery-thumb {
    flex: 0 0 72px;
    width: 72px;
    height: 48px;
    padding: 0;
    border-radius: 6px;
    border: 1px solid var(--line);
    background: var(--paper-inset);
    overflow: hidden;
    cursor: pointer;
  }
  .gallery-thumb.is-active {
    border-color: var(--accent);
    border-width: 2px;
  }
  .gallery-thumb img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .detail-section { margin-bottom: 22px; }
  .detail-section h2 {
    margin: 0 0 8px;
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--accent);
  }
  .detail-section p {
    margin: 0;
    color: var(--ink-soft);
    max-width: 40em;
    font-size: var(--text-base);
    line-height: 1.65;
  }
  .detail-features {
    margin: 0;
    padding-left: 2.25rem;
    list-style: none;
    color: var(--ink-soft);
    font-size: var(--text-base);
    line-height: 1.6;
  }
  .detail-features li {
    position: relative;
    margin-bottom: 6px;
    padding-left: 0;
  }
  .detail-features li::before {
    content: "";
    position: absolute;
    left: -1.15rem;
    top: 0.55em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    opacity: 0.75;
  }
  .detail-stack {
    margin: 0;
    color: var(--ink-soft);
    font-size: var(--text-base);
  }
  .detail-related {
    margin: 0;
    padding-left: 1.15rem;
    color: var(--ink-soft);
    font-size: var(--text-base);
  }
  .detail-related li { margin-bottom: 6px; }
  .detail-related a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
  }
  .detail-related a:hover { text-decoration: underline; }

  /* ---------- lightbox ---------- */
  .lightbox {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(20, 21, 26, 0.92);
    padding: 0;
    touch-action: none;
    overflow: hidden;
  }
  .lightbox[hidden] { display: none; }
  .lightbox-stage {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
  }
  .lightbox img {
    max-width: min(100% - 24px, 1100px);
    max-height: calc(100vh - 72px);
    max-height: calc(100dvh - 72px);
    object-fit: contain;
    border-radius: 4px;
    transform-origin: center center;
    will-change: transform;
    user-select: none;
    -webkit-user-select: none;
    pointer-events: none;
  }
  .lightbox-close,
  .lightbox-nav {
    position: absolute;
    z-index: 3;
    border: 0;
    background: rgba(0, 0, 0, 0.4);
    color: rgba(255, 255, 255, 0.9);
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    line-height: 1;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
  }
  .lightbox-close {
    top: max(10px, env(safe-area-inset-top));
    right: max(10px, env(safe-area-inset-right));
    width: 32px;
    height: 32px;
    font-size: 1.25rem;
  }
  .lightbox-nav {
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    opacity: 0.75;
  }
  .lightbox-nav:hover { opacity: 1; }
  .lightbox-prev { left: max(6px, env(safe-area-inset-left)); }
  .lightbox-next { right: max(6px, env(safe-area-inset-right)); }

  :focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

  /* mobile tweaks */
  @media (max-width: 640px) {
    :root {
      --text-xs: 12px;
      --text-sm: 14px;
      --text-base: 16px;
      --text-md: 17px;
      --text-lg: 19px;
    }
    body { font-size: var(--text-base); line-height: 1.5; }
    .hero { padding: 16px 0 12px; }
    h1.name { font-size: 1.5rem; line-height: 1.2; }
    .hero-sub { margin-top: 0; }
    .role-line { font-size: var(--text-sm); line-height: 1.35; }
    .hero-toggle {
      display: inline-flex;
      align-items: center;
      appearance: none;
      border: 0;
      background: transparent;
      color: var(--accent);
      font: inherit;
      font-size: var(--text-sm);
      font-weight: 600;
      padding: 2px 0;
      margin: 0;
      margin-inline-start: auto;
      cursor: pointer;
      line-height: 1.3;
      flex: 0 0 auto;
    }
    .stack-sheet:not(.is-open) { display: none !important; }
    .stack-sheet.is-open {
      position: fixed;
      inset: 0;
      z-index: 70;
      margin: 0;
      display: flex;
      align-items: flex-end;
      justify-content: center;
    }
    .stack-sheet-backdrop {
      display: block;
      position: absolute;
      inset: 0;
      border: 0;
      padding: 0;
      margin: 0;
      background: color-mix(in srgb, var(--ink) 28%, transparent);
      cursor: pointer;
      animation: stackFadeIn .22s ease both;
    }
    .stack-sheet.is-closing .stack-sheet-backdrop {
      animation: stackFadeOut .26s ease both;
    }
    .stack-sheet-panel {
      position: relative;
      z-index: 1;
      width: 100%;
      max-height: min(78vh, 640px);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      background: var(--bg);
      border-radius: 16px 16px 0 0;
      border-top: 1px solid var(--line-soft);
      padding: 14px 16px 0;
      box-shadow: 0 -10px 40px color-mix(in srgb, var(--ink) 10%, transparent);
      animation: stackUp .28s cubic-bezier(0.4, 0, 0.2, 1) both;
    }
    .stack-sheet.is-closing .stack-sheet-panel {
      animation: stackDown .28s cubic-bezier(0.4, 0, 0.2, 1) both;
    }
    .stack-sheet-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin: 0 0 12px;
      position: relative;
      z-index: 2;
      flex-shrink: 0;
      background: var(--bg);
      padding-bottom: 2px;
    }
    .stack-sheet-head h2 {
      margin: 0;
      font-size: var(--text-md);
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--ink);
    }
    .stack-sheet-close {
      appearance: none;
      border: 0;
      background: transparent;
      color: var(--ink-soft);
      width: 32px;
      height: 32px;
      border-radius: 0;
      font-size: 1.25rem;
      line-height: 1;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0;
    }
    .tech-stack {
      gap: 10px;
      max-width: none;
      overflow: auto;
      flex: 1 1 auto;
      min-height: 0;
      padding-bottom: calc(18px + env(safe-area-inset-bottom, 0px));
      -webkit-overflow-scrolling: touch;
    }
    .tech-group {
      grid-template-columns: 1fr;
      row-gap: 2px;
      padding-bottom: 10px;
      border-bottom: 1px solid var(--line-soft);
    }
    .tech-group:last-child {
      border-bottom: 0;
      padding-bottom: 0;
    }
    .tech-items { color: var(--ink-soft); }

    @keyframes stackFadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }
    @keyframes stackFadeOut {
      from { opacity: 1; }
      to { opacity: 0; }
    }
    @keyframes stackUp {
      from { transform: translateY(100%); }
      to { transform: translateY(0); }
    }
    @keyframes stackDown {
      from { transform: translateY(0); }
      to { transform: translateY(100%); }
    }
    .card-title { font-size: var(--text-md); }
    .card-date { font-size: var(--text-xs); }
    .card-detail p:not(:first-child) { display: none; }
    .card-tech { padding: 4px 9px; }
    .detail-title { font-size: 1.5rem; }
    .detail-section p,
    .detail-features,
    .detail-stack,
    .detail-related { font-size: var(--text-base); }
    .btn-demo,
    .btn-github { font-size: var(--text-sm); }
    .cat-chip { font-size: var(--text-xs); padding: 0 11px; }
    .contact-icons a { width: 30px; height: 30px; }
    .filterbar-slide { padding: 10px 0; }
    .detail-header {
      flex-direction: column;
      align-items: stretch;
    }
    .detail-actions {
      width: 100%;
      gap: 5px;
    }
    .btn-demo,
    .btn-github {
      flex: 1 1 0;
      min-width: 0;
      min-height: 40px;
      padding: 8px 4px;
      font-size: 11px;
    }
    .gallery-nav { display: none; }
    .gallery-stage { min-height: 160px; }
    .gallery-video-play {
      width: 52px;
      height: 52px;
    }
    .gallery-video-play svg {
      width: 22px;
      height: 22px;
    }
    .gallery-head { margin-bottom: 10px; }
    .gallery-device-btn {
      min-height: 40px;
      padding: 8px 14px;
      gap: 7px;
    }
    .gallery-thumbs { padding: 14px 10px 12px; gap: 8px; }
    .gallery-thumb {
      flex: 0 0 64px;
      width: 64px;
      height: 44px;
    }
    .lightbox-close {
      width: 28px;
      height: 28px;
      font-size: 1.15rem;
    }
    .lightbox-nav {
      width: 26px;
      height: 26px;
      font-size: 0.95rem;
      opacity: 0.65;
    }
    .lightbox img {
      max-width: calc(100% - 8px);
      max-height: calc(100dvh - 56px);
    }
  }