:root {
      --bg: #020202;
      --panel: rgba(255, 255, 255, 0.06);
      --panel-strong: rgba(255, 255, 255, 0.12);
      --border: rgba(255, 255, 255, 0.12);
      --text: #ffffff;
      --muted: rgba(255, 255, 255, 0.68);
      --pink: #ff0092;
      --pink-soft: rgba(255, 0, 146, 0.14);
      --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
      --trans-speed: 0.6s;
      --progress-color: #ff0092;
      --safe-top: max(env(safe-area-inset-top), 20px);
      --safe-right: max(env(safe-area-inset-right), 28px);
      --safe-bottom: max(env(safe-area-inset-bottom), 28px);
      --safe-left: max(env(safe-area-inset-left), 28px);
    }

    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html, body {
      width: 100%;
      height: 100%;
      background: #000;
      color: var(--text);
      font-family: "Segoe UI", Helvetica, Arial, sans-serif;
      overflow: hidden;
      user-select: none;
      -webkit-user-select: none;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      background:
        radial-gradient(circle at top left, rgba(255, 0, 146, 0.18), transparent 30%),
        radial-gradient(circle at top right, rgba(64, 0, 255, 0.18), transparent 24%),
        linear-gradient(155deg, #1a001a 0%, #0d0020 45%, #000000 100%);
    }

    button, input, select {
      font: inherit;
      color: inherit;
    }

    button {
      border: none;
      background: none;
    }

    .hidden {
      display: none !important;
    }

    .screen {
      position: fixed;
      inset: 0;
      overflow: hidden;
    }

    .screen-shell {
      width: 100%;
      height: 100%;
      padding: var(--safe-top) var(--safe-right) var(--safe-bottom) var(--safe-left);
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .scroll-shell {
      overflow-y: auto;
      /* removed: -webkit-overflow-scrolling: touch — deprecated no-op on iOS 13+ (iOS audit) */
    }

    .topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      min-height: 48px;
    }

    .topbar-main {
      display: flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
    }

    .title-block {
      min-width: 0;
    }

    .title-block h1,
    .title-block h2 {
      font-size: clamp(24px, 3vw, 34px);
      line-height: 1.05;
      font-weight: 700;
      letter-spacing: -0.03em;
    }

    .title-meta {
      margin-top: 6px;
      font-size: 13px;
      color: var(--muted);
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }

    .count-chip {
      padding: 10px 14px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.08);
      color: var(--muted);
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      white-space: nowrap;
    }

    .icon-btn,
    .pill-btn,
    .primary-btn,
    .secondary-btn,
    .segmented-btn,
    .nav-card,
    .thumb-fav,
    .thumb-pin {
      cursor: pointer;
      transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
    }

    .icon-btn:active,
    .pill-btn:active,
    .primary-btn:active,
    .secondary-btn:active,
    .segmented-btn:active,
    .nav-card:active,
    .thumb-fav:active,
    .thumb-pin:active {
      transform: scale(0.97);
    }

    .icon-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 48px;
      height: 48px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.14);
      background: rgba(255, 255, 255, 0.05);
      box-shadow: var(--shadow);
      flex: 0 0 auto;
    }

    .icon-btn.back-btn {
      width: auto;
      padding: 0 16px 0 12px;
      gap: 6px;
      border: 1.5px solid rgba(255, 255, 255, 0.28);
      background: rgba(255, 255, 255, 0.10);
      font-size: 15px;
      font-weight: 600;
      color: #fff;
      letter-spacing: 0.01em;
    }

    .icon-btn.back-btn:hover {
      background: rgba(255, 255, 255, 0.16);
      border-color: rgba(255, 255, 255, 0.40);
    }

    .icon-btn.is-pinned {
      background: rgba(255, 0, 146, 0.25);
      border-color: rgba(255, 0, 146, 0.7);
    }

    #viewer-pin-btn {
      filter: grayscale(1) brightness(2);
    }

    #viewer-pin-btn.is-pinned {
      filter: none;
    }

    #viewer-favorite-btn.is-favorited {
      background: rgba(255, 0, 146, 0.25);
      border-color: rgba(255, 0, 146, 0.7);
    }

    .icon-btn:focus-visible,
    .pill-btn:focus-visible,
    .primary-btn:focus-visible,
    .secondary-btn:focus-visible,
    .segmented-btn:focus-visible,
    .nav-card:focus-visible,
    .thumb-fav:focus-visible,
    .thumb-pin:focus-visible {
      outline: 3px solid rgba(255, 255, 255, 0.9);
      outline-offset: 3px;
    }

    .primary-btn,
    .secondary-btn {
      min-height: 64px;
      border-radius: 22px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 18px 22px;
      font-size: 18px;
      font-weight: 700;
      width: 100%;
    }

    .primary-btn {
      background: linear-gradient(135deg, #ff0092, #ff3cb0);
      box-shadow: 0 20px 48px rgba(255, 0, 146, 0.35);
    }

    .secondary-btn {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.16);
    }

    .primary-btn[disabled],
    .secondary-btn[disabled] {
      opacity: 0.45;
      cursor: not-allowed;
    }

    .pill-row,
    .sort-row,
    .action-stack {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .pill-btn,
    .segmented-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 40px;
      padding: 10px 14px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.12);
      background: rgba(255, 255, 255, 0.05);
      color: var(--muted);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.02em;
    }

    .pill-btn.active,
    .segmented-btn.active {
      background: var(--pink-soft);
      border-color: rgba(255, 0, 146, 0.8);
      color: #fff;
    }

    .card-panel {
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.04));
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: 28px;
      box-shadow: var(--shadow);
      padding: 18px;
    }

    .meta-label {
      font-size: 12px;
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 0.08em;
      margin-bottom: 10px;
    }

    #pin-screen .screen-shell,
    #home-screen .screen-shell,
    #category-screen .screen-shell,
    #preview-screen .screen-shell,
    #browse-screen .screen-shell {
      background:
        radial-gradient(circle at 0% 0%, rgba(255, 0, 146, 0.16), transparent 30%),
        linear-gradient(145deg, rgba(10, 0, 20, 0.92), rgba(0, 0, 0, 0.96));
    }

    #pin-screen .screen-shell {
      align-items: center;
      justify-content: center;
    }

    .pin-panel {
      width: min(100%, 420px);
      padding: 28px 24px 24px;
      border-radius: 34px;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
      border: 1px solid rgba(255, 255, 255, 0.12);
      box-shadow: var(--shadow);
      text-align: center;
    }

    .pin-logo {
      width: auto;
      height: 108px;
      display: block;
      margin: 0 auto 18px;
      object-fit: contain;
    }

    .pin-title {
      font-size: 28px;
      font-weight: 700;
      letter-spacing: -0.03em;
      margin-bottom: 10px;
    }

    .pin-subtitle {
      color: var(--muted);
      font-size: 15px;
      margin-bottom: 24px;
    }

    .pin-dots {
      display: flex;
      justify-content: center;
      gap: 14px;
      margin-bottom: 20px;
    }

    .pin-dot {
      width: 16px;
      height: 16px;
      border-radius: 999px;
      border: 2px solid rgba(255, 255, 255, 0.24);
      background: transparent;
      transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
    }

    .pin-dot.filled {
      background: var(--pink);
      border-color: var(--pink);
      transform: scale(1.06);
    }

    .pin-error {
      min-height: 22px;
      color: #ff6bb9;
      font-size: 14px;
      margin-bottom: 12px;
      opacity: 0;
      transition: opacity 0.18s ease;
    }

    .pin-error.visible {
      opacity: 1;
    }

    .pin-dots.shake {
      animation: shake 0.34s ease;
    }

    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      20% { transform: translateX(-8px); }
      40% { transform: translateX(8px); }
      60% { transform: translateX(-5px); }
      80% { transform: translateX(5px); }
    }

    .pin-pad {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
    }

    .pin-key {
      min-height: 84px;
      border-radius: 24px;
      border: 1px solid rgba(255, 255, 255, 0.12);
      background: rgba(255, 255, 255, 0.06);
      font-size: 28px;
      font-weight: 700;
      box-shadow: var(--shadow);
    }

    .pin-key.empty {
      visibility: hidden;
      pointer-events: none;
    }

    .pin-admin-btn {
      width: 100%;
      min-height: 44px;
      margin-bottom: 12px;
      border-radius: 14px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.08);
      color: #fff;
      font-weight: 700;
      letter-spacing: 0.02em;
    }

    #home-screen .screen-shell {
      gap: 20px;
    }

    #logo {
      width: auto;
      height: 120px;
      display: block;
      margin: 0 auto;
      object-fit: contain;
    }

    .home-summary {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 16px 18px;
      border-radius: 24px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .home-summary-copy {
      min-width: 0;
    }

    .home-summary-copy strong {
      display: block;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .home-summary-copy span {
      color: var(--muted);
      font-size: 13px;
    }

    .sync-btn {
      flex: 0 0 auto;
      min-width: 110px;
      min-height: 46px;
      padding: 0 18px;
      border-radius: 999px;
      background: rgba(255, 0, 146, 0.14);
      border: 1px solid rgba(255, 0, 146, 0.55);
      font-weight: 700;
    }

    #settings-fab {
      position: fixed;
      right: calc(var(--safe-right) + 18px);
      bottom: calc(var(--safe-bottom) + 18px);
      width: 58px;
      height: 58px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(10, 10, 14, 0.92);
      color: #fff;
      box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
      z-index: 45;
      font-size: 24px;
      font-weight: 700;
    }

    #settings-fab[aria-hidden="true"] {
      display: none;
    }

    .settings-backdrop {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.52);
      z-index: 46;
    }

    .settings-sheet {
      position: fixed;
      left: 0;
      right: 0;
      bottom: 0;
      max-height: 86vh;
      overflow: auto;
      border-radius: 24px 24px 0 0;
      background: #12131a;
      border-top: 1px solid rgba(255, 255, 255, 0.14);
      box-shadow: 0 -14px 38px rgba(0, 0, 0, 0.45);
      padding: 20px 20px calc(var(--safe-bottom) + 26px);
      z-index: 47;
      transform: translateY(112%);
      transition: transform 0.2s ease;
    }

    .settings-sheet.open {
      transform: translateY(0);
    }

    .settings-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 14px;
      gap: 12px;
    }

    .settings-head h2 {
      margin: 0;
      font-size: 20px;
      letter-spacing: -0.03em;
    }

    .settings-close {
      min-height: 40px;
      padding: 0 14px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.18);
      background: rgba(255, 255, 255, 0.08);
      font-weight: 700;
      color: #fff;
    }

    .settings-auth {
      display: grid;
      gap: 12px;
      padding: 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      margin-bottom: 14px;
    }

    .settings-auth p {
      margin: 0;
      color: var(--muted);
      font-size: 13px;
    }

    .settings-pin-pad {
      margin-top: 4px;
    }

    .settings-pin-pad .pin-key {
      min-height: 58px;
      font-size: 22px;
      border-radius: 16px;
    }

    .folder-pin-pad {
      margin-top: 4px;
    }

    .folder-pin-pad .pin-key {
      min-height: 58px;
      font-size: 22px;
      border-radius: 16px;
    }

    .settings-grid {
      display: grid;
      gap: 12px;
    }

    .settings-card {
      display: grid;
      gap: 10px;
      padding: 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
    }

    .settings-card h3 {
      margin: 0;
      font-size: 15px;
      letter-spacing: 0.01em;
    }

    .settings-card p {
      margin: 0;
      color: var(--muted);
      font-size: 12px;
      line-height: 1.45;
    }

    .settings-row {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      align-items: center;
    }

    .settings-input,
    .settings-slider {
      width: 100%;
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.16);
      background: rgba(0, 0, 0, 0.3);
      color: #fff;
      padding: 10px 12px;
      font-size: 15px;
    }

    .settings-slider {
      padding: 0;
      accent-color: var(--pink);
    }

    .settings-pill,
    .settings-btn {
      min-height: 40px;
      padding: 0 14px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.18);
      background: rgba(255, 255, 255, 0.08);
      color: #fff;
      font-weight: 700;
      letter-spacing: 0.01em;
    }

    .settings-btn.primary {
      border-color: rgba(255, 0, 146, 0.55);
      background: rgba(255, 0, 146, 0.2);
    }

    .settings-btn.warning {
      border-color: rgba(255, 147, 77, 0.55);
      background: rgba(255, 147, 77, 0.14);
    }

    .settings-btn.block {
      width: 100%;
    }

    .settings-value {
      font-variant-numeric: tabular-nums;
      color: #ffd7ec;
      font-size: 14px;
      letter-spacing: 0.01em;
    }

    .settings-error {
      color: #ff8abc;
      min-height: 18px;
      font-size: 12px;
    }

    #device-list {
      display: grid;
      gap: 8px;
      max-height: 210px;
      overflow: auto;
    }

    .device-list-item {
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.14);
      padding: 8px 10px;
      background: rgba(255, 255, 255, 0.04);
      font-size: 12px;
      color: var(--muted);
    }

    .device-list-item strong {
      display: block;
      color: #fff;
      margin-bottom: 2px;
      font-size: 13px;
    }

    #category-grid,
    #subcategory-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
    }

    .nav-card {
      min-height: 140px;
      padding: 0;
      border-radius: 26px;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
      border: 1px solid rgba(255, 255, 255, 0.12);
      text-align: left;
      display: flex;
      flex-direction: column;
      overflow: hidden;
      box-shadow: var(--shadow);
    }

    .nav-card.show-all {
      grid-column: 1 / -1;
      min-height: 84px;
      background: linear-gradient(135deg, rgba(255, 0, 146, 0.16), rgba(255, 0, 146, 0.08));
      border-color: rgba(255, 0, 146, 0.55);
    }

    .nav-card-thumb {
      height: 130px;
      overflow: hidden;
      flex-shrink: 0;
      background: rgba(255, 255, 255, 0.04);
    }

    .nav-card-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: center 30%;
      display: block;
    }

    .nav-card-body {
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 16px 18px;
    }

    .nav-card.show-all .nav-card-body {
      align-items: center;
      justify-content: center;
      gap: 4px;
    }

    .nav-card-title {
      font-size: 21px;
      font-weight: 700;
      letter-spacing: -0.03em;
    }

    .nav-card-meta {
      font-size: 13px;
      color: var(--muted);
      letter-spacing: 0.02em;
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
    }

    .status-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 24px;
      height: 24px;
      padding: 0 8px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.07);
      color: var(--muted);
      font-size: 12px;
      font-weight: 700;
    }

    .status-badge.cached {
      background: rgba(77, 214, 122, 0.16);
      color: #9dffc0;
    }

    .status-badge.partial {
      background: rgba(255, 184, 77, 0.16);
      color: #ffd38f;
    }

    .status-badge.empty {
      background: rgba(255, 255, 255, 0.08);
      color: var(--muted);
    }

    .empty-state {
      padding: 22px;
      border-radius: 24px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      color: var(--muted);
      text-align: center;
    }

    .switch-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 14px 16px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
    }

    .switch-copy strong {
      display: block;
      font-size: 16px;
      margin-bottom: 4px;
    }

    .switch-copy span {
      color: var(--muted);
      font-size: 13px;
    }

    .toggle {
      position: relative;
      width: 58px;
      height: 34px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.1);
      flex: 0 0 auto;
    }

    .toggle::after {
      content: "";
      position: absolute;
      top: 3px;
      left: 3px;
      width: 26px;
      height: 26px;
      border-radius: 999px;
      background: #fff;
      transition: transform 0.15s ease;
    }

    .toggle.active {
      background: rgba(255, 0, 146, 0.32);
      border-color: rgba(255, 0, 146, 0.62);
    }

    .toggle.active::after {
      transform: translateX(24px);
      background: var(--pink);
    }

    #cache-bar-wrap {
      display: none;
      width: 100%;
    }

    #cache-bar-label {
      font-size: 12px;
      color: var(--muted);
      margin-bottom: 8px;
      text-align: center;
      letter-spacing: 0.04em;
    }

    #cache-bar-track {
      width: 100%;
      height: 8px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.12);
      overflow: hidden;
    }

    #cache-bar-fill {
      width: 0%;
      height: 100%;
      border-radius: 999px;
      background: linear-gradient(90deg, #ff0092, #ff66bf);
      transition: width 0.24s ease;
      box-shadow: 0 0 14px rgba(255, 0, 146, 0.45);
    }

    #status-msg {
      color: var(--muted);
      text-align: center;
      min-height: 20px;
      font-size: 14px;
    }

    #browse-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      grid-auto-rows: 108px;
      gap: 10px;
      padding-bottom: 18px;
    }

    .browse-item {
      position: relative;
      overflow: hidden;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.12);
      box-shadow: var(--shadow);
    }

    .browse-item.portrait {
      grid-row: span 2;
    }

    .browse-item.landscape {
      grid-row: span 1;
    }

    .browse-group-header {
      grid-column: 1 / -1;
      width: 100%;
      padding: 1.1rem 0.25rem 0.5rem;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text);
      border-bottom: 1px solid rgba(255, 255, 255, 0.12);
      margin: 0.5rem 0 0;
      text-transform: capitalize;
      pointer-events: none;
    }

    .browse-group-header:first-child {
      margin-top: 0;
    }

    .browse-card-btn {
      position: absolute;
      inset: 0;
      overflow: hidden;
      border-radius: inherit;
    }

    .browse-card-btn img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .thumb-fav {
      position: absolute;
      right: 10px;
      bottom: 10px;
      width: 34px;
      height: 34px;
      border-radius: 999px;
      background: rgba(0, 0, 0, 0.5);
      border: 1px solid rgba(255, 255, 255, 0.18);
      z-index: 2;
      font-size: 18px;
    }

    .thumb-pin {
      position: absolute;
      left: 10px;
      bottom: 10px;
      width: 34px;
      height: 34px;
      border-radius: 999px;
      background: rgba(0, 0, 0, 0.5);
      border: 1px solid rgba(255, 255, 255, 0.18);
      z-index: 2;
      font-size: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .thumb-pin.is-pinned {
      background: rgba(255, 0, 146, 0.7);
      border-color: rgba(255, 0, 146, 0.9);
    }

    #viewer-screen {
      background: #000;
    }

    .viewer-shell {
      width: 100%;
      height: 100%;
      padding: var(--safe-top) var(--safe-right) var(--safe-bottom) var(--safe-left);
      display: flex;
      flex-direction: column;
    }

    .viewer-topbar,
    .viewer-tags {
      transition: opacity 0.2s ease;
    }

    .viewer-topbar.hidden-ui,
    .viewer-tags.hidden-ui {
      opacity: 0;
      pointer-events: none;
    }

    .viewer-topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      z-index: 2;
    }

    .viewer-center {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      min-height: 0;
    }

    #viewer-image {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
    }

    /* FIX: portrait photos should show in full — cover crops them (iOS audit BUG-20) */
    /* #viewer-image.portrait { object-fit: cover; } -- REMOVED */

    .viewer-image-btn {
      width: 100%;
      height: 100%;
      /* FIX: suppress browser scroll on horizontal swipe (iOS audit) */
      touch-action: pan-y;
    }

    .viewer-tap-zone {
      position: absolute;
      top: 0;
      bottom: 0;
      width: 22%;
      display: flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 1;
      touch-action: pan-y;
      -webkit-tap-highlight-color: transparent;
    }

    .viewer-tap-prev { left: 0; justify-content: flex-start; padding-left: 18px; }
    .viewer-tap-next { right: 0; justify-content: flex-end; padding-right: 18px; }

    .viewer-chevron {
      font-size: 3.5rem;
      line-height: 1;
      color: rgba(255, 255, 255, 0.55);
      text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
      transition: opacity 160ms ease-out, color 160ms ease-out;
      pointer-events: none;
      user-select: none;
    }

    .viewer-tap-zone[hidden] { display: none; }

    .viewer-tap-zone.is-tapped .viewer-chevron {
      color: rgba(255, 255, 255, 0.95);
    }

    .viewer-tap-zone:focus-visible {
      outline: 4px solid rgba(255, 255, 255, 0.9);
      outline-offset: -10px;
    }

    #viewer-screen.handoff-mode #viewer-favorite-btn,
    #viewer-screen.handoff-mode #viewer-pin-btn,
    #viewer-screen.handoff-mode #viewer-handoff-btn { display: none; }

    #viewer-screen.handoff-mode #viewer-back-btn::after {
      content: " (hold)";
      font-size: 0.72em;
      opacity: 0.75;
      margin-left: 4px;
    }

    .pill-btn {
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: #fff;
      border-radius: 999px;
      padding: 6px 12px;
      font-size: 13px;
      letter-spacing: 0.04em;
      cursor: pointer;
    }

    .pill-btn[aria-pressed="true"] {
      background: rgba(255, 255, 255, 0.22);
      border-color: rgba(255, 255, 255, 0.35);
    }

    .viewer-tags {
      margin-top: 12px;
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 8px;
    }

    .viewer-tag {
      padding: 8px 12px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.14);
      font-size: 12px;
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 0.08em;
    }

    #slideshow-screen {
      background: #000;
      overflow: hidden;
    }

    #slide-wrap {
      position: absolute;
      inset: 0;
      overflow: hidden;
    }

    .slide {
      position: absolute;
      inset: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #000;
      will-change: transform, opacity;
    }

    .slide-ambient {
      position: absolute;
      inset: -6%;
      background-position: center;
      background-size: cover;
      background-repeat: no-repeat;
      transform: scale(1.14);
      filter: blur(30px) saturate(1.12) brightness(0.5);
      opacity: 0.92;
      z-index: 1;
      pointer-events: none;
    }

    .slide img {
      width: 100%;
      height: 100%;
      display: block;
      position: relative;
      z-index: 2;
      background: transparent;
      object-fit: contain;
      object-position: center center;
      /* FIX: prevent iOS "Save to Photos" context menu on long-press (Frontend BUG-04) */
      -webkit-touch-callout: none;
    }

    .slide-vignette {
      position: absolute;
      inset: 0;
      z-index: 3;
      pointer-events: none;
      background:
        radial-gradient(140% 120% at 50% 50%, rgba(0, 0, 0, 0) 38%, rgba(0, 0, 0, 0.24) 100%);
    }

    #viewer-image {
      /* FIX: prevent iOS "Save to Photos" context menu on long-press (Frontend BUG-04) */
      -webkit-touch-callout: none;
    }

    .slide img.fit-contain {
      object-fit: contain;
    }

    body.trans-slide .slide {
      transition: transform var(--trans-speed) ease-in-out;
    }

    body.trans-slide .slide.active { transform: translateX(0); }
    body.trans-slide .slide.enter { transform: translateX(100%); }
    body.trans-slide .slide.exit { transform: translateX(-100%); }
    body.trans-slide .slide.standby { transform: translateX(100%); visibility: hidden; }

    body.trans-fade .slide {
      transition: opacity var(--trans-speed) ease;
    }

    body.trans-fade .slide.active { opacity: 1; }
    body.trans-fade .slide.enter,
    body.trans-fade .slide.exit,
    body.trans-fade .slide.standby {
      opacity: 0;
    }

    body.trans-fade .slide.standby {
      visibility: hidden;
    }

    body.trans-none .slide.active { opacity: 1; }
    body.trans-none .slide.standby { opacity: 0; visibility: hidden; }

    #tap-prev,
    #tap-next {
      position: absolute;
      top: 0;
      bottom: 0;
      z-index: 2;
      width: 50%;
      background: transparent;
      color: transparent;
      border: none;
      cursor: pointer;
    }

    #tap-prev { left: 0; }
    #tap-next { right: 0; }

    #tap-prev:focus-visible,
    #tap-next:focus-visible {
      outline: 4px solid rgba(255, 255, 255, 0.9);
      outline-offset: -10px;
    }

    #hud {
      position: absolute;
      left: var(--safe-left);
      right: var(--safe-right);
      bottom: calc(var(--safe-bottom) + 18px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      z-index: 4;
      pointer-events: none;
    }

    .hud-group {
      display: flex;
      align-items: center;
      gap: 10px;
      pointer-events: auto;
    }

    .hud-info {
      display: flex;
      flex-direction: column;
      gap: 4px;
      min-width: 0;
      text-shadow: 0 1px 6px rgba(0, 0, 0, 0.9);
    }

    #hud-label {
      font-size: 12px;
      font-weight: 700;
      color: rgba(255, 255, 255, 0.7);
      letter-spacing: 0.12em;
      text-transform: uppercase;
    }

    #hud-count {
      font-size: 13px;
      color: rgba(255, 255, 255, 0.46);
      font-variant-numeric: tabular-nums;
    }

    .hud-btn {
      width: 48px;
      height: 48px;
      border-radius: 999px;
      background: rgba(0, 0, 0, 0.5);
      border: 1px solid rgba(255, 255, 255, 0.16);
      box-shadow: var(--shadow);
      pointer-events: auto;
      font-size: 20px;
    }

    #slideshow-qr-wrap {
      position: absolute;
      right: calc(var(--safe-right) + 18px);
      bottom: calc(var(--safe-bottom) + 82px);
      z-index: 6;
      pointer-events: none;
    }

    #slideshow-qr-card {
      width: 112px;
      border-radius: 16px;
      background: rgba(14, 14, 18, 0.84);
      border: 1px solid rgba(255, 255, 255, 0.18);
      box-shadow: 0 10px 24px rgba(0, 0, 0, 0.45);
      padding: 8px;
    }

    #slideshow-qr-card img {
      width: 100%;
      display: block;
      border-radius: 10px;
      background: #fff;
    }

    #slideshow-lock-overlay,
    #lock-code-modal,
    #device-onboarding {
      position: fixed;
      inset: 0;
      z-index: 60;
      background: rgba(0, 0, 0, 0.7);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 18px;
    }

    .lock-panel {
      width: min(420px, 100%);
      border-radius: 20px;
      border: 1px solid rgba(255, 255, 255, 0.18);
      background: #12131a;
      box-shadow: 0 22px 40px rgba(0, 0, 0, 0.5);
      padding: 18px;
      display: grid;
      gap: 12px;
    }

    .lock-panel h3,
    .lock-panel h2 {
      margin: 0;
      font-size: 22px;
      letter-spacing: -0.03em;
    }

    .lock-panel p {
      margin: 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.45;
    }

    .lock-mode-row {
      display: flex;
      gap: 8px;
    }

    .lock-mode-btn {
      flex: 1;
      min-height: 40px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.16);
      background: rgba(255, 255, 255, 0.08);
      color: #fff;
      font-weight: 700;
    }

    .lock-mode-btn.active {
      border-color: rgba(255, 0, 146, 0.55);
      background: rgba(255, 0, 146, 0.22);
    }

    .lock-code-value {
      font-size: 38px;
      letter-spacing: 0.28em;
      text-align: center;
      font-weight: 800;
      margin: 6px 0;
    }

    .lock-error {
      color: #ff8abc;
      min-height: 18px;
      font-size: 13px;
    }

    .lock-admin-link {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 40px;
      padding: 0 14px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.16);
      background: rgba(255, 255, 255, 0.08);
      color: #fff;
      font-weight: 700;
      text-decoration: none;
      letter-spacing: 0.01em;
    }

    #progress-wrap {
      position: absolute;
      left: 0;
      right: 0;
      /* FIX: use safe area so bar isn't hidden behind iPad home indicator (iOS audit) */
      bottom: env(safe-area-inset-bottom, 0);
      height: 3px;
      z-index: 5;
      background: rgba(255, 255, 255, 0.08);
    }

    #progress-fill {
      width: 0%;
      height: 100%;
      background: var(--progress-color);
    }

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

    @media (max-width: 720px) {
      #browse-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    @media (min-width: 600px) {
      #category-grid,
      #subcategory-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }
    }

    @media (min-width: 1024px) {
      #category-grid,
      #subcategory-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
      }
    }

    @media (min-width: 1440px) {
      #category-grid,
      #subcategory-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
      }
    }

    /* ── Category screen – new inline-browse layout ─────────────────────────── */

    .category-chip-row {
      display: flex;
      flex-wrap: nowrap;
      overflow-x: auto;
      gap: 8px;
      position: relative;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .category-chip-row::-webkit-scrollbar { display: none; }

    .cat-sort-inline {
      position: sticky;
      left: 0;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding-right: 8px;
      background: linear-gradient(to right, #0b0b0f 80%, transparent);
      flex-shrink: 0;
      z-index: 1;
    }
    .cat-sort-label {
      font-size: 12px;
      color: rgba(255, 255, 255, 0.5);
      white-space: nowrap;
    }

    .cat-chip {
      display: inline-flex;
      align-items: center;
      min-height: 36px;
      padding: 8px 16px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.14);
      background: rgba(255, 255, 255, 0.06);
      color: var(--muted);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.02em;
      cursor: pointer;
      transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
      white-space: nowrap;
    }

    .cat-chip.active {
      background: var(--pink-soft);
      border-color: rgba(255, 0, 146, 0.8);
      color: #fff;
    }

    .cat-chip:active {
      transform: scale(0.97);
    }

    .category-controls {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-wrap: wrap;
    }

    #category-sort-row { display: none; }

    .category-sort-row {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      flex: 1;
      min-width: 0;
    }

    .category-toggle-group {
      display: flex;
      gap: 8px;
      flex-shrink: 0;
    }

    .cat-toggle-btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 40px;
      padding: 0 14px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.14);
      background: rgba(255, 255, 255, 0.06);
      color: var(--muted);
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
      white-space: nowrap;
    }

    .cat-toggle-btn:active {
      transform: scale(0.97);
    }

    .cat-toggle-btn.active {
      background: var(--pink-soft);
      border-color: rgba(255, 0, 146, 0.8);
      color: #fff;
    }

    .cat-slideshow-btn {
      background: rgba(255, 0, 146, 0.12);
      border-color: rgba(255, 0, 146, 0.5);
      color: rgba(255, 180, 230, 0.9);
    }

    .cat-slideshow-btn:active {
      background: rgba(255, 0, 146, 0.24);
    }

    .cat-toggle-icon {
      font-size: 16px;
      line-height: 1;
    }

    .cat-toggle-label {
      font-size: 13px;
    }

    .category-photo-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      grid-auto-rows: 108px;
      gap: 10px;
      padding-bottom: 18px;
    }

    @media (max-width: 720px) {
      .category-photo-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    @media (min-width: 1024px) {
      .category-photo-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
      }
    }

    @media (min-width: 1440px) {
      .category-photo-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
      }
    }

    /* ── End category screen styles ─────────────────────────────────────────── */

    /* Folder PIN prompt overlay */
    .folder-pin-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.65);
      z-index: 60;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 24px;
    }

    /* ── Browse hearts + picks ──────────────────────────────────────────────── */
    .browse-item { position: relative; }

    .browse-thumb-heart {
      position: absolute;
      bottom: 8px; right: 8px;
      width: 36px; height: 36px;
      border: none;
      background: rgba(0,0,0,0.35);
      border-radius: 50%;
      color: rgba(255,255,255,0.5);
      font-size: 18px;
      line-height: 36px;
      text-align: center;
      cursor: pointer;
      z-index: 2;
      -webkit-tap-highlight-color: transparent;
      touch-action: manipulation;
    }
    .browse-thumb-heart.is-favorited { color: #ff0092; background: rgba(0,0,0,0.5); }

    @keyframes heart-pop {
      0%   { transform: scale(1); }
      50%  { transform: scale(1.35); }
      100% { transform: scale(1); }
    }
    .browse-thumb-heart.is-tapped { animation: heart-pop 120ms ease-out; }

    .cat-picks-section { margin: 12px 0 8px; }
    .cat-picks-section.is-empty .cat-picks-header { opacity: 0.35; }
    .cat-picks-section.is-empty #cat-picks-clear { display: none; }

    .cat-picks-header {
      display: flex; align-items: center; justify-content: space-between; padding: 0 4px;
    }

    #cat-picks-toggle {
      display: flex; align-items: center; gap: 6px;
      background: none; border: none;
      font-size: 15px; font-weight: 600; color: #fff; cursor: pointer;
    }

    .cat-picks-clear-btn {
      background: none;
      border: 1px solid rgba(255,255,255,0.2);
      color: rgba(255,255,255,0.5);
      border-radius: 6px; padding: 4px 10px; font-size: 12px; cursor: pointer;
      transition: background 160ms, color 160ms, border-color 160ms;
    }
    .cat-picks-clear-btn.is-armed {
      background: rgba(255, 0, 100, 0.9);
      color: #fff;
      border-color: transparent;
      animation: clear-shake 220ms ease-out;
    }
    @keyframes clear-shake {
      0%, 100% { transform: translateX(0); }
      25%       { transform: translateX(-3px); }
      75%       { transform: translateX(3px); }
    }

    .cat-picks-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
      gap: 8px; margin-top: 8px;
      max-height: 0; overflow: hidden;
      transition: max-height 220ms ease-out;
    }
    /* Bug 2 fix: was 600px — clips large pick sets */
    .cat-picks-grid.is-expanded { max-height: 40vh; overflow-y: auto; }

    .cat-pick-thumb-btn {
      display: block; padding: 0; border: none; background: none;
      border-radius: 6px; overflow: hidden; cursor: pointer;
      width: 100%; aspect-ratio: 1;
      -webkit-tap-highlight-color: transparent;
      touch-action: manipulation;
    }
    .cat-pick-thumb-btn img {
      width: 100%; height: 100%; object-fit: cover; display: block;
    }
    .cat-pick-thumb-btn:active img { opacity: 0.8; }

    .cat-picks-thumb {
      display: block;
      border-radius: 4px;
    }

    /* ── Sort select dropdown ───────────────────────────────────────────────── */
    #cat-sort-select {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.2);
      color: #fff;
      border-radius: 8px;
      padding: 6px 12px;
      font-size: 13px;
      cursor: pointer;
    }

    /* ── Slideshow FAB + controls polish ──────────────────────────────────── */

    /* Play button — folder screen, fixed circle bottom-left */
    #category-slideshow-btn {
      position: fixed;
      bottom: 24px; left: 24px;
      width: 52px; height: 52px;
      border-radius: 50%;
      background: rgba(255,255,255,0.12);
      border: 1px solid rgba(255,255,255,0.2);
      color: #fff; font-size: 22px;
      display: flex; align-items: center; justify-content: center;
      cursor: pointer; z-index: 10;
    }

    /* Prevent play button overlapping last grid row */
    .category-photo-grid { padding-bottom: 80px; }

    /* Slideshow controls (HUD) — hidden by default, shown on tap */
    .slideshow-controls {
      opacity: 0;
      transition: opacity 200ms ease-out;
      pointer-events: none;
    }
    .slideshow-controls.is-visible {
      opacity: 1;
      pointer-events: auto;
    }

    /* Photo counter — always visible, unobtrusive */
    .slideshow-counter {
      position: absolute;
      bottom: 14px; right: 16px;
      color: rgba(255,255,255,0.45);
      font-size: 13px;
      font-variant-numeric: tabular-nums;
      pointer-events: none;
    }

    /* Settings FAB — less prominent */
    #settings-fab {
      opacity: 0.5;
      bottom: 16px;
    }
    #settings-fab:hover, #settings-fab:focus-visible { opacity: 0.75; }