/* SPDX-License-Identifier: AGPL-3.0-or-later */

  :root {
    --paper: #ece6d8;
    --paper-2: #e3dccb;
    --ink: #0c0a08;
    --ink-soft: #2a2622;
    --ink-mute: #6b655a;
    --accent: #8a1d18;
  }

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

  html, body {
    background: var(--paper);
    color: var(--ink);
    font-family: 'Bodoni Moda', serif;
    min-height: 100vh;
    overflow-x: hidden;
  }

  body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background-image:
      radial-gradient(rgba(12,10,8,0.05) 1px, transparent 1px),
      radial-gradient(rgba(12,10,8,0.04) 1px, transparent 1px);
    background-size: 3px 3px, 7px 7px;
    background-position: 0 0, 1px 2px;
    mix-blend-mode: multiply;
    opacity: .55;
  }

  .mono { font-family: 'JetBrains Mono', monospace; }

  .frame {
    position: relative;
    z-index: 2;
    max-width: 1400px;
    margin: 0 auto;
    padding: 28px 40px 60px;
  }

  /* ── HEADER ── */
  header.masthead {
    border-top: 3px solid var(--ink);
    border-bottom: 1px solid var(--ink);
    padding: 14px 0 8px;
  }
  .kicker {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10.5px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink-soft);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--ink);
  }
  h1.title {
    font-family: 'Bodoni Moda', serif;
    font-weight: 900;
    font-size: clamp(41px, 8vw, 115px);
    letter-spacing: -0.04em;
    line-height: 0.86;
    margin: 22px 0 6px;
    font-variation-settings: "opsz" 96;
  }
  h1.title em { font-style: italic; font-weight: 400; color: var(--accent); }
  .title-sub {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-bottom: 10px;
  }

  .subhead {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 18px;
    align-items: center;
    border-top: 1px solid var(--ink);
    padding-top: 14px;
    margin-top: 8px;
  }
  .subhead .lede {
    font-family: 'Bodoni Moda', serif;
    font-style: italic;
    font-size: 19px;
    line-height: 1.4;
    color: var(--ink-soft);
    max-width: 100%;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: opacity .2s;
    white-space: nowrap;
  }
  .subhead .meta {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-soft);
    text-align: right;
    line-height: 1.7;
  }

  /* ── TOOL NAV ── */
  .tool-nav {
    display: flex;
    align-items: stretch;
    border-bottom: 3px solid var(--ink);
    overflow-x: auto;
    scrollbar-width: none;
  }
  .tool-nav::-webkit-scrollbar { display: none; }
  .tool-nav-label {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 16px 0 0;
    font-family: 'JetBrains Mono', monospace;
    font-size: 9.5px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--ink-mute);
    border-right: 1px solid var(--ink);
    flex-shrink: 0;
    white-space: nowrap;
  }
  .tool-nav-label::before { content: "§"; color: var(--accent); }
  .tool-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-right: 1px solid var(--ink);
    font-family: 'JetBrains Mono', monospace;
    font-size: 10.5px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
    transition: background .15s, color .15s;
    white-space: nowrap;
    flex-shrink: 0;
  }
  .tool-tab:hover:not(.active) { background: var(--paper-2); }
  .tool-tab.active { background: var(--ink); color: var(--paper); }
  .tool-tab .tab-num { font-size: 9px; opacity: .5; letter-spacing: 0.1em; }
  .tool-tab.active .tab-num { opacity: .7; }
  .tool-tab:focus-visible,
  .drop:focus-visible,
  .toggle:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
  }

  /* ── MAIN GRID ── */
  main {
    display: grid;
    grid-template-columns: 360px minmax(0, 1fr);
    border-bottom: 3px solid var(--ink);
    min-height: 600px;
  }
  @media (max-width: 900px) {
    main { grid-template-columns: 1fr; }
    .panel-left { border-right: none !important; border-bottom: 1px solid var(--ink); }
  }
  .panel { padding: 28px 26px; min-width: 0; }
  .panel-left { border-right: 1px solid var(--ink); background: var(--paper-2); align-self: start; }

  .section-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10.5px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
  }
  .section-label::before { content: "§"; margin-right: 6px; color: var(--accent); }

  /* ── DROP ZONE ── */
  .drop {
    border: 1.5px dashed var(--ink);
    padding: 36px 22px;
    text-align: center;
    cursor: pointer;
    transition: background .25s, border-color .25s;
  }
  .drop:hover, .drop.drag { background: var(--paper); border-color: var(--accent); }
  .drop .glyph { font-family: 'Bodoni Moda', serif; font-style: italic; font-size: 64px; line-height: 1; margin-bottom: 6px; }
  .drop .lbl { font-family: 'Bodoni Moda', serif; font-size: 22px; }
  .drop .sub { font-family: 'JetBrains Mono', monospace; font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-mute); margin-top: 8px; }
  #fileInput { display: none; }

  /* ── FILE CARD ── */
  .filecard { border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); padding: 14px 0; margin: 16px 0; display: none; }
  .filecard.on { display: block; }
  .filecard .name { font-family: 'Bodoni Moda', serif; font-weight: 700; font-size: 17px; margin-bottom: 4px; word-break: break-all; line-height: 1.2; }
  .filecard .stats { font-family: 'JetBrains Mono', monospace; font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-mute); display: flex; gap: 14px; flex-wrap: wrap; }
  .filecard .stats span b { color: var(--ink); font-weight: 500; }

  /* ── TOOL PANELS ── */
  .tool-panel { display: none; }
  .tool-panel.active { display: block; }

  /* ── SHARED: BIG NUMBER DISPLAY ── */
  .big-display {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 8px;
  }
  .big-display .num {
    font-family: 'Bodoni Moda', serif;
    font-weight: 900;
    font-size: 76px;
    line-height: 0.85;
    letter-spacing: -0.04em;
    font-variation-settings: "opsz" 96;
  }
  .big-display .num.md { font-size: 60px; }
  .big-display .denom { font-family: 'Bodoni Moda', serif; font-style: italic; font-size: 22px; color: var(--ink-mute); }
  .big-display .tag { margin-left: auto; font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; background: var(--ink); color: var(--paper); padding: 4px 8px; }

  /* histogram */
  .histo { height: 56px; width: 100%; background: var(--paper); border: 1px solid var(--ink); margin: 6px 0 12px; position: relative; overflow: hidden; }
  .histo canvas { display: block; width: 100%; height: 100%; }
  .histo .needle { position: absolute; top: 0; bottom: 0; width: 1px; background: var(--accent); pointer-events: none; }
  .histo .needle::before { content: ""; position: absolute; top: -3px; left: -3px; width: 7px; height: 7px; background: var(--accent); transform: rotate(45deg); }

  /* slider */
  input[type=range].slider { -webkit-appearance: none; appearance: none; width: 100%; height: 28px; background: transparent; cursor: pointer; }
  input[type=range].slider::-webkit-slider-runnable-track { height: 4px; background: var(--ink); }
  input[type=range].slider::-moz-range-track { height: 4px; background: var(--ink); }
  input[type=range].slider::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 28px; background: var(--accent); border: 1.5px solid var(--ink); margin-top: -12px; cursor: grab; border-radius: 0; }
  input[type=range].slider::-moz-range-thumb { width: 18px; height: 28px; background: var(--accent); border: 1.5px solid var(--ink); cursor: grab; border-radius: 0; }
  .slider-tags { display: flex; justify-content: space-between; font-family: 'JetBrains Mono', monospace; font-size: 9.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-mute); margin-top: 4px; }

  /* toggles */
  .toggles { display: flex; gap: 8px; margin-top: 18px; flex-wrap: wrap; }
  .toggle { border: 1px solid var(--ink); padding: 7px 11px; font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; background: var(--paper); cursor: pointer; user-select: none; transition: all .15s; }
  .toggle:hover { background: var(--paper-2); }
  .toggle.on { background: var(--ink); color: var(--paper); }

  /* greyscale slider rows */
  .grey-row { margin-bottom: 22px; }

  /* ── RESOLUTION CHECKBOX ── */
  .res-label {
    display: flex;
    align-items: center;
    gap: 9px;
    cursor: pointer;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-soft);
    margin-bottom: 14px;
    user-select: none;
  }
  .res-label input { display: none; }
  .res-box {
    width: 13px; height: 13px;
    border: 1.5px solid var(--ink);
    background: var(--paper);
    flex-shrink: 0;
    position: relative;
    transition: background .15s;
  }
  .res-label input:checked + .res-box { background: var(--ink); }
  .res-label input:checked + .res-box::after {
    content: "";
    position: absolute;
    left: 2px; top: 0px;
    width: 5px; height: 8px;
    border-right: 1.5px solid var(--paper);
    border-bottom: 1.5px solid var(--paper);
    transform: rotate(40deg);
  }
  .res-note {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-left: auto;
    white-space: nowrap;
  }

  /* ── PAGE NAV ── */
  .pagenav { display: flex; align-items: center; margin-top: 24px; border: 1px solid var(--ink); }
  .pagenav button { flex: 0 0 44px; height: 44px; background: var(--paper); border: none; border-right: 1px solid var(--ink); font-family: 'Bodoni Moda', serif; font-size: 22px; cursor: pointer; transition: background .15s; }
  .pagenav button:last-child { border-right: none; border-left: 1px solid var(--ink); }
  .pagenav button:hover:not(:disabled) { background: var(--ink); color: var(--paper); }
  .pagenav button:disabled { opacity: 0.3; cursor: not-allowed; }
  .pagenav .num { flex: 1; text-align: center; font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: 0.12em; }
  .pagenav .num b { font-weight: 700; }

  /* ── DOWNLOAD ── */
  .actions { margin-top: 28px; }
  .btn-print { display: block; width: 100%; padding: 18px 16px; background: var(--ink); color: var(--paper); border: none; font-family: 'Bodoni Moda', serif; font-weight: 700; font-size: 22px; letter-spacing: -0.01em; cursor: pointer; text-align: left; position: relative; transition: background .2s, padding-left .2s; font-variation-settings: "opsz" 48; }
  .btn-print::after { content: "→"; position: absolute; right: 16px; top: 50%; transform: translateY(-50%); font-size: 24px; transition: right .2s; }
  .btn-print:hover:not(:disabled) { background: var(--accent); padding-left: 22px; }
  .btn-print:hover:not(:disabled)::after { right: 12px; }
  .btn-print:disabled { opacity: 0.4; cursor: not-allowed; }
  .btn-print .small { display: block; font-family: 'JetBrains Mono', monospace; font-size: 9.5px; font-weight: 400; letter-spacing: 0.2em; text-transform: uppercase; margin-top: 4px; opacity: .65; }
  .advanced-options { margin-top: 14px; }
  .advanced-options.hidden { display: none; }
  .advanced-toggle {
    width: 100%;
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(255,255,255,0.74);
    color: var(--ink);
    font: 700 13px/1 var(--font-sans);
    cursor: pointer;
    box-shadow: 0 12px 28px rgba(15,23,42,0.06);
    transition: background .2s, border-color .2s, box-shadow .2s;
  }
  .advanced-toggle:hover { background: rgba(255,255,255,0.94); border-color: var(--line-strong); }
  .advanced-chevron {
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg) translateY(-2px);
    transition: transform .22s ease;
    opacity: .55;
  }
  .advanced-toggle[aria-expanded="true"] .advanced-chevron {
    transform: rotate(225deg) translate(-1px, -1px);
  }
  .advanced-panel {
    margin-top: 8px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255,255,255,0.64);
    box-shadow: 0 18px 42px rgba(15,23,42,0.07);
  }
  .advanced-panel[hidden] { display: none; }
  .advanced-row {
    display: grid;
    grid-template-columns: 20px 1fr;
    gap: 10px;
    align-items: start;
    padding: 9px 8px;
    border-radius: 12px;
    color: var(--ink);
  }
  .advanced-row input {
    width: 16px;
    height: 16px;
    margin: 1px 0 0;
    accent-color: var(--accent);
  }
  .advanced-row b {
    display: block;
    font: 700 12px/1.15 var(--font-sans);
  }
  .advanced-row small {
    display: block;
    margin-top: 3px;
    color: var(--ink-mute);
    font: 600 10px/1.25 var(--font-sans);
  }
  .advanced-row.is-disabled { opacity: .52; }
  .advanced-password,
  .advanced-text-input {
    width: 100%;
    margin-top: 4px;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: rgba(255,255,255,0.78);
    color: var(--ink);
    font: 600 12px/1 var(--font-sans);
    outline: none;
  }
  .advanced-password:focus,
  .advanced-text-input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(47,113,226,0.12); }
  .advanced-password:disabled,
  .advanced-text-input:disabled { opacity: .45; cursor: not-allowed; }

  /* ── PREVIEW ── */
  .panel-right {
    background:
      linear-gradient(135deg, transparent 49.5%, rgba(12,10,8,0.04) 49.5%, rgba(12,10,8,0.04) 50.5%, transparent 50.5%) 0 0 / 24px 24px,
      var(--paper);
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    align-self: start;
    overflow: hidden;
  }
  .preview-bar { display: flex; justify-content: space-between; align-items: center; gap: 16px; min-width: 0; border-bottom: 1px solid var(--ink); padding-bottom: 10px; margin-bottom: 16px; }
  .preview-bar .title { font-family: 'Bodoni Moda', serif; font-size: 26px; font-weight: 700; flex: 1 1 auto; min-width: 0; }
  .preview-bar .title em { font-style: italic; font-weight: 400; color: var(--ink-mute); }
  .preview-stage { background: #fff; box-sizing: border-box; flex: 0 0 auto; display: flex; align-items: center; justify-content: center; width: 100%; max-width: 100%; min-width: 0; height: var(--preview-stage-height, clamp(620px, 82vh, 1100px)); min-height: 520px; padding: 20px 24px; position: relative; overflow: auto; overscroll-behavior: auto; }
  .preview-stage.zoomed { align-items: flex-start; justify-content: center; padding: 20px 24px; }
  .preview-stage.pannable { cursor: grab; touch-action: none; user-select: none; }
  .preview-stage.panning { cursor: grabbing; }
  .preview-stage .empty { text-align: center; color: var(--ink-mute); }
  .preview-stage .empty .big { font-family: 'Bodoni Moda', serif; font-style: italic; font-size: 48px; line-height: 1; margin-bottom: 12px; }
  .preview-stage .empty .small { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; }
  .preview-canvas-wrap { background: white; box-shadow: 0 1px 0 rgba(12,10,8,0.15), 0 8px 22px -6px rgba(12,10,8,0.35), 0 18px 50px -10px rgba(12,10,8,0.25); max-width: 100%; max-height: 78vh; flex-shrink: 0; }
  .preview-canvas-wrap canvas { display: block; max-width: 100%; max-height: 78vh; height: auto; width: auto; }
  .preview-canvas-wrap.zoomed { max-width: none; max-height: none; }
  .preview-canvas-wrap.zoomed canvas { max-width: none; max-height: none; }

  /* ── ZOOM BAR ── */
  .zoom-bar { display: flex; align-items: center; border: 1px solid var(--ink); flex-shrink: 0; }
  .zoom-btn { width: 30px; height: 28px; background: var(--paper); border: none; font-family: 'Bodoni Moda', serif; font-size: 20px; line-height: 1; cursor: pointer; transition: background .15s, color .15s; flex-shrink: 0; }
  .zoom-btn:first-child { border-right: 1px solid var(--ink); }
  .zoom-btn:last-child { border-left: 1px solid var(--ink); }
  .zoom-btn:hover:not(:disabled) { background: var(--ink); color: var(--paper); }
  .zoom-btn:disabled { opacity: 0.3; cursor: not-allowed; }
  .zoom-val { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; width: 56px; text-align: center; cursor: pointer; user-select: none; flex-shrink: 0; }
  .zoom-val:hover { color: var(--accent); }

  /* ── LOADER ── */
  .loader { position: absolute; inset: 0; background: rgba(236,230,216,0.9); display: none; align-items: center; justify-content: center; flex-direction: column; z-index: 10; backdrop-filter: blur(2px); }
  .loader.on { display: flex; }
  .loader .lab { font-family: 'Bodoni Moda', serif; font-style: italic; font-size: 32px; margin-bottom: 6px; }
  .loader .pct { font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: 0.16em; color: var(--ink-mute); }
  .loader .bar { width: 240px; height: 4px; background: var(--paper-2); border: 1px solid var(--ink); margin-top: 14px; overflow: hidden; }
  .loader .bar > div { height: 100%; background: var(--ink); width: 0%; transition: width .25s; }

  /* ── FOOTER ── */
  footer { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-top: 28px; padding-top: 14px; border-top: 1px solid var(--ink); font-family: 'JetBrains Mono', monospace; font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-mute); flex-wrap: wrap; }
  footer em { font-family: 'Bodoni Moda', serif; font-style: italic; font-size: 14px; text-transform: none; letter-spacing: 0; color: var(--ink-soft); }

  .language-switcher {
    align-items: center;
    display: flex;
    flex: 1 1 360px;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    min-width: 0;
  }

  .language-switcher button {
    appearance: none;
    background: none;
    border: 0;
    color: var(--ink-mute);
    cursor: pointer;
    font: inherit;
    letter-spacing: 0;
    padding: 0;
    transition: color .16s;
    white-space: nowrap;
  }

  .language-switcher button:hover,
  .language-switcher button[aria-pressed="true"] {
    color: var(--ink-soft);
  }

  .err { margin-top: 12px; padding: 10px 12px; border-left: 3px solid var(--accent); background: rgba(138,29,24,0.08); font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--ink-soft); display: none; }
  .err.on { display: block; }

  /* ── APPLE-LIKE REFRESH ── */
  :root {
    --paper: #f5f5f7;
    --paper-2: #ffffff;
    --ink: #1d1d1f;
    --ink-soft: #424245;
    --ink-mute: #6e6e73;
    --accent: #0071e3;
    --accent-soft: #e8f2ff;
    --line: rgba(0, 0, 0, 0.1);
    --line-strong: rgba(0, 0, 0, 0.18);
    --shadow-soft: 0 18px 50px rgba(0, 0, 0, 0.08);
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.06);
    --radius-lg: 28px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --font-ui: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  }

  body.dark-mode {
    --paper: #111113;
    --paper-2: #1c1c1e;
    --ink: #f5f5f7;
    --ink-soft: #e8e8ed;
    --ink-mute: #a1a1a6;
    --accent-soft: rgba(0, 113, 227, 0.18);
    --line: rgba(255, 255, 255, 0.14);
    --line-strong: rgba(255, 255, 255, 0.24);
    --shadow-soft: 0 18px 55px rgba(0, 0, 0, 0.46);
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.34);
    color-scheme: dark;
  }

  * { letter-spacing: 0 !important; }

  html, body {
    background:
      radial-gradient(circle at 50% -20%, rgba(255, 255, 255, 0.95), rgba(245, 245, 247, 0) 34%),
      var(--paper);
    font-family: var(--font-ui);
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
    text-rendering: geometricPrecision;
  }

  body.dark-mode {
    background:
      radial-gradient(circle at 50% -20%, rgba(78, 78, 82, 0.32), rgba(17, 17, 19, 0) 34%),
      var(--paper);
    color: var(--ink);
  }

  body::before { display: none; }

  .mono,
  .kicker,
  .title-sub,
  .subhead .meta,
  .tool-nav-label,
  .tool-tab,
  .section-label,
  .drop .sub,
  .filecard .stats,
  .big-display .tag,
  .slider-tags,
  .toggle,
  .res-label,
  .res-note,
  .pagenav .num,
  .btn-print .small,
  .preview-stage .empty .small,
  .zoom-val,
  .loader .pct,
  footer,
  .err {
    font-family: var(--font-ui);
  }

  h1.title,
  h1.title em,
  .subhead .lede,
  .drop .glyph,
  .drop .lbl,
  .filecard .name,
  .big-display .num,
  .big-display .denom,
  .pagenav button,
  .btn-print,
  .preview-bar .title,
  .preview-bar .title em,
  .preview-stage .empty .big,
  .zoom-btn,
  .loader .lab,
  footer em {
    font-family: var(--font-ui);
    font-style: normal;
  }

  .frame { padding-top: 36px; }

  header.masthead {
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.76);
    box-shadow: var(--shadow-soft);
    padding: 22px 28px;
    backdrop-filter: blur(22px) saturate(1.3);
    transition: padding .85s cubic-bezier(.2, .8, .2, 1), border-radius .85s cubic-bezier(.2, .8, .2, 1), box-shadow .85s cubic-bezier(.2, .8, .2, 1);
  }

  .kicker,
  .subhead {
    border-color: var(--line);
  }

  h1.title {
    font-weight: 800;
    letter-spacing: 0 !important;
    transition: font-size .85s cubic-bezier(.2, .8, .2, 1), line-height .85s cubic-bezier(.2, .8, .2, 1), margin .85s cubic-bezier(.2, .8, .2, 1);
  }

  h1.title em {
    color: var(--accent);
    font-weight: 600;
  }

  body.title-condensed header.masthead {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    padding: 18px 24px;
  }

  body.title-condensed h1.title {
    font-size: clamp(31px, 4vw, 48px);
    line-height: 1.02;
    margin: 12px 0 4px;
  }

  .title-sub,
  .section-label,
  .tool-nav-label,
  .tool-tab,
  .slider-tags,
  .toggle,
  .res-label,
  .res-note,
  .btn-print .small,
  .preview-stage .empty .small,
  .zoom-val,
  footer {
    text-transform: none;
  }

  .subhead .lede {
    font-weight: 500;
    color: var(--ink-soft);
  }

  .subhead .meta {
    align-items: center;
    border: 1px solid var(--accent);
    border-radius: 50%;
    color: var(--accent);
    cursor: help;
    display: inline-flex;
    font-size: 0;
    font-weight: 700;
    height: 26px;
    justify-content: center;
    line-height: 1;
    position: relative;
    text-align: center;
    text-transform: none;
    width: 26px;
    z-index: 5;
  }

  .subhead .meta::before {
    content: "i";
    font-size: 14px;
  }

  .subhead .meta::after {
    background: rgba(29, 29, 31, .94);
    border-radius: 12px;
    bottom: calc(100% + 10px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, .18);
    color: #fff;
    content: attr(data-tooltip);
    font-size: 12px;
    font-weight: 500;
    line-height: 1.45;
    opacity: 0;
    padding: 10px 12px;
    pointer-events: none;
    position: absolute;
    right: 0;
    text-align: left;
    transform: translateY(4px);
    transition: opacity .16s, transform .16s;
    white-space: pre-line;
    width: max-content;
    max-width: min(340px, 80vw);
  }

  .subhead .meta:hover::after,
  .subhead .meta:focus::after {
    opacity: 1;
    transform: translateY(0);
  }

  .tool-nav {
    margin: 18px 0 0;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.72);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.045);
    padding: 5px;
  }

  .tool-nav-label {
    border-right: 0;
    padding: 0 14px;
  }

  .tool-nav-label::before,
  .section-label::before {
    content: "";
    display: none;
  }

  .tool-tab {
    border: 0;
    border-radius: 999px;
    padding: 10px 18px;
    font-weight: 600;
  }

  .tool-tab:hover:not(.active) {
    background: rgba(0, 0, 0, 0.045);
  }

  .tool-tab.active {
    background: var(--ink);
    color: #fff;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.16);
  }

  main {
    margin-top: 18px;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--paper-2);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
  }

  @media (max-width: 900px) {
    .panel-left { border-bottom-color: var(--line) !important; }
  }

  .panel-left {
    border-right-color: var(--line);
    background: rgba(250, 250, 252, 0.92);
    align-self: stretch;
  }

  .panel-right {
    background: #fff;
    align-self: stretch;
  }

  .section-label {
    color: var(--ink-mute);
    font-weight: 600;
  }

  .drop {
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius-md);
    background: #fff;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
  }

  .drop:hover,
  .drop.drag {
    background: var(--accent-soft);
    border-color: rgba(0, 113, 227, 0.42);
  }

  .drop .glyph {
    color: var(--accent);
    font-weight: 700;
  }

  .drop .lbl,
  .filecard .name,
  .preview-bar .title {
    font-weight: 700;
  }

  .filecard {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: #fff;
    padding: 14px;
    box-shadow: var(--shadow-card);
  }

  .filecard .name {
    border-radius: 8px;
    cursor: text;
    margin: -4px -6px 4px;
    padding: 4px 6px;
    transition: background .16s, box-shadow .16s;
  }

  .filecard .name:hover,
  .filecard .name:focus {
    background: #f5f5f7;
    box-shadow: inset 0 0 0 1px var(--line);
    outline: none;
  }

  .file-name-input {
    background: #f5f5f7;
    border: 1px solid var(--accent);
    border-radius: 8px;
    color: var(--ink);
    display: block;
    font: inherit;
    font-weight: 700;
    line-height: 1.2;
    margin: -4px -6px 4px;
    padding: 4px 6px;
    width: calc(100% + 12px);
  }

  .big-display .num {
    font-weight: 800;
    letter-spacing: 0 !important;
  }

  .big-display .denom {
    color: var(--ink-mute);
    font-weight: 600;
  }

  .big-display .tag {
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 700;
    padding: 5px 10px;
  }

  .histo {
    border-color: var(--line);
    border-radius: var(--radius-sm);
    background: #fff;
    box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.04);
  }

  .histo .needle,
  .histo .needle::before {
    background: var(--accent);
  }

  input[type=range].slider::-webkit-slider-runnable-track,
  input[type=range].slider::-moz-range-track {
    height: 6px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--accent), #8cc7ff);
  }

  input[type=range].slider::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
    margin-top: -9px;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.2);
  }

  input[type=range].slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.2);
  }

  .toggle {
    border-color: var(--line);
    border-radius: 999px;
    background: #fff;
    color: var(--ink-soft);
    font-weight: 600;
  }

  .toggle:hover {
    background: #f1f1f3;
  }

  .toggle.on {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
  }

  .res-box {
    border-color: var(--line-strong);
    border-radius: 4px;
    background: #fff;
  }

  .res-label input:checked + .res-box {
    background: var(--accent);
    border-color: var(--accent);
  }

  .pagenav,
  .zoom-bar {
    border-color: var(--line);
    border-radius: 999px;
    background: #fff;
    overflow: hidden;
  }

  .pagenav button,
  .zoom-btn {
    background: transparent;
    color: var(--ink);
    font-weight: 700;
  }

  .pagenav button,
  .pagenav button:last-child,
  .zoom-btn:first-child,
  .zoom-btn:last-child {
    border-color: var(--line);
  }

  .pagenav button:hover:not(:disabled),
  .zoom-btn:hover:not(:disabled) {
    background: var(--accent);
    color: #fff;
  }

  .btn-print {
    border-radius: var(--radius-md);
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    box-shadow: 0 12px 28px rgba(0, 113, 227, 0.24);
  }

  .btn-print:hover:not(:disabled) {
    background: #0077ed;
  }

  .preview-bar {
    border-bottom-color: var(--line);
  }

  .preview-canvas-wrap {
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06), 0 18px 46px rgba(0, 0, 0, 0.13), 0 0 38px rgba(0, 0, 0, 0.06);
    max-height: none;
    overflow: hidden;
  }

  .preview-canvas-wrap canvas {
    max-height: none;
  }

  .loader {
    background: rgba(245, 245, 247, 0.84);
    backdrop-filter: blur(18px) saturate(1.25);
  }

  .loader .lab {
    font-weight: 700;
  }

  .loader .bar {
    height: 8px;
    border: 0;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.08);
  }

  .loader .bar > div {
    border-radius: 999px;
    background: var(--accent);
  }

  footer {
    border-top-color: var(--line);
  }

  footer em {
    color: var(--ink-mute);
  }

  .language-switcher button {
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 500;
    text-transform: none;
  }

  .theme-toggle {
    align-items: center;
    background: rgba(255, 255, 255, 0.74);
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink-soft);
    cursor: pointer;
    display: inline-flex;
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 700;
    gap: 9px;
    padding: 7px 8px 7px 12px;
    transition: background .18s, border-color .18s, color .18s, box-shadow .18s;
    white-space: nowrap;
  }

  .theme-toggle:hover {
    background: #fff;
    border-color: var(--line-strong);
    box-shadow: var(--shadow-card);
  }

  .theme-toggle-track {
    align-items: center;
    background: #d2d2d7;
    border-radius: 999px;
    display: inline-flex;
    height: 24px;
    padding: 2px;
    transition: background .18s;
    width: 44px;
  }

  .theme-toggle-thumb {
    background: #fff;
    border-radius: 999px;
    box-shadow: 0 2px 7px rgba(0, 0, 0, .2);
    height: 20px;
    transform: translateX(0);
    transition: transform .22s cubic-bezier(.2, .8, .2, 1);
    width: 20px;
  }

  body.dark-mode header.masthead {
    background: rgba(38, 38, 41, 0.78);
  }

  body.dark-mode main {
    background: var(--paper-2);
  }

  body.dark-mode .tool-nav,
  body.dark-mode .drop,
  body.dark-mode .filecard,
  body.dark-mode .organize-summary,
  body.dark-mode .edit-controls,
  body.dark-mode .quality-toggle,
  body.dark-mode .split-panel,
  body.dark-mode .merge-file-item,
  body.dark-mode .split-part-row,
  body.dark-mode .page-context-menu,
  body.dark-mode .page-editor-bottom,
  body.dark-mode .theme-toggle {
    background: #242426;
  }

  body.dark-mode .panel-left {
    background: #1a1a1c;
  }

  body.dark-mode .panel-right {
    background: #171719;
  }

  body.dark-mode .preview-stage,
  body.dark-mode .preview-stage.organizing,
  body.dark-mode .preview-stage.editing,
  body.dark-mode .page-editor-main {
    background: #202023;
  }

  body.dark-mode .tool-tab:hover:not(.active),
  body.dark-mode .btn-secondary:hover:not(:disabled),
  body.dark-mode .merge-file-actions button:hover:not(:disabled),
  body.dark-mode .page-context-menu button:hover:not(:disabled),
  body.dark-mode .page-editor-bottom button:hover:not(:disabled) {
    background: #303033;
  }

  body.dark-mode .tool-tab.active,
  body.dark-mode .tool-indicator,
  body.dark-mode .toggle.on,
  body.dark-mode .btn-print {
    background: #3a3a3c;
    color: #fff;
  }

  body.dark-mode .btn-print:hover:not(:disabled) {
    background: var(--accent);
  }

  body.dark-mode .filecard .name:hover,
  body.dark-mode .filecard .name:focus,
  body.dark-mode .file-name-input,
  body.dark-mode .split-name-input,
  body.dark-mode .page-editor-bottom button,
  body.dark-mode .zoom-btn,
  body.dark-mode .pagenav button,
  body.dark-mode .btn-secondary,
  body.dark-mode .toggle,
  body.dark-mode .crop-readout {
    background: #2c2c2e;
    color: var(--ink);
  }

  body.dark-mode .page-card,
  body.dark-mode .page-edit-card {
    background: #242426;
    box-shadow: 0 12px 34px rgba(0, 0, 0, 0.34);
  }

  body.dark-mode .page-card-actions {
    background: rgba(36, 36, 38, 0.94);
  }

  body.dark-mode .page-thumb-placeholder {
    background-color: #fff;
  }

  body.dark-mode .loader {
    background: rgba(28, 28, 30, 0.88);
  }

  body.dark-mode .loader .bar {
    background: rgba(255, 255, 255, 0.14);
  }

  body.dark-mode .theme-toggle {
    color: var(--ink);
  }

  body.dark-mode .theme-toggle:hover {
    background: #303033;
  }

  body.dark-mode .theme-toggle-track {
    background: var(--accent);
  }

  body.dark-mode .theme-toggle-thumb {
    transform: translateX(20px);
  }

  .err {
    border-left: 0;
    border-radius: var(--radius-sm);
    background: #fff2f2;
    color: #b42318;
  }

  .tool-nav {
    position: relative;
  }

  .tool-indicator {
    position: absolute;
    top: 5px;
    left: 0;
    width: 0;
    height: calc(100% - 10px);
    border-radius: 999px;
    background: var(--ink);
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.16);
    transform: translateX(0);
    transition: transform 260ms cubic-bezier(.2, .8, .2, 1), width 260ms cubic-bezier(.2, .8, .2, 1);
    z-index: 0;
    pointer-events: none;
  }

  .tool-tab {
    position: relative;
    z-index: 1;
  }

  .tool-tab.active {
    background: transparent;
    box-shadow: none;
  }

  body.dark-mode .tool-indicator {
    background: #3a3a3c;
  }

  body.dark-mode .tool-tab.active {
    color: #fff;
  }

  .btn-secondary {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #fff;
    color: var(--ink);
    cursor: pointer;
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 700;
    padding: 11px 14px;
    transition: background .18s, border-color .18s, color .18s;
  }

  .btn-secondary:hover:not(:disabled) {
    background: #f1f1f3;
    border-color: var(--line-strong);
  }

  .btn-secondary:disabled {
    color: var(--ink-mute);
    cursor: not-allowed;
    opacity: .5;
  }

  .btn-secondary-accent {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
  }

  .btn-secondary-accent:hover:not(:disabled) {
    background: #0077ed;
    border-color: #0077ed;
    color: #fff;
  }

  .organize-summary {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--ink-soft);
    font-size: 13px;
    line-height: 1.45;
    margin-bottom: 12px;
    padding: 13px 14px;
  }

  .merge-list {
    display: grid;
    gap: 10px;
    margin-bottom: 12px;
  }

  .merge-file-row {
    align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    display: grid;
    gap: 10px;
    grid-template-columns: auto minmax(0, 1fr) auto;
    padding: 10px;
  }

  .merge-file-index {
    align-items: center;
    background: var(--accent-soft);
    border-radius: 999px;
    color: var(--accent);
    display: inline-flex;
    font-size: 12px;
    font-weight: 800;
    height: 28px;
    justify-content: center;
    width: 28px;
  }

  .merge-file-name {
    color: var(--ink);
    font-size: 13px;
    font-weight: 700;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .merge-file-meta {
    color: var(--ink-mute);
    font-size: 12px;
    margin-top: 2px;
  }

  .merge-file-actions {
    display: flex;
    gap: 4px;
  }

  .merge-file-actions button {
    align-items: center;
    background: #f5f5f7;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink);
    cursor: pointer;
    display: inline-flex;
    font-size: 14px;
    font-weight: 800;
    height: 28px;
    justify-content: center;
    padding: 0;
    width: 28px;
  }

  .merge-file-actions button:hover:not(:disabled) {
    background: var(--accent-soft);
    border-color: rgba(0, 113, 227, 0.22);
    color: var(--accent);
  }

  .merge-file-actions button:disabled {
    cursor: not-allowed;
    opacity: .35;
  }

  .merge-actions,
  .edit-button-row {
    display: grid;
    gap: 8px;
    grid-template-columns: 1fr 1fr;
  }

  .edit-controls {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    padding: 13px 14px;
  }

  .quality-toggle {
    align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    display: flex;
    gap: 12px;
    justify-content: space-between;
    margin-bottom: 12px;
    padding: 13px 14px;
  }

  .quality-copy {
    min-width: 0;
  }

  .quality-copy span {
    color: var(--ink);
    display: block;
    font-size: 13px;
    font-weight: 750;
  }

  .quality-copy b {
    color: var(--ink-mute);
    display: block;
    font-size: 12px;
    font-weight: 650;
    margin-top: 2px;
  }

  .circle-switch {
    align-items: center;
    background: #e9e9ed;
    border: 0;
    border-radius: 999px;
    cursor: pointer;
    display: inline-flex;
    flex: 0 0 auto;
    height: 34px;
    padding: 3px;
    transition: background .18s;
    width: 58px;
  }

  .circle-switch::before {
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(0, 0, 0, .18);
    content: "";
    height: 28px;
    transform: translateX(0);
    transition: transform .18s;
    width: 28px;
  }

  .circle-switch.on {
    background: var(--accent);
  }

  .circle-switch.on::before {
    transform: translateX(24px);
  }

  .edit-control-head {
    align-items: baseline;
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
  }

  .edit-control-head span {
    color: var(--ink);
    font-size: 13px;
    font-weight: 750;
  }

  .edit-control-head b {
    color: var(--accent);
    font-size: 12px;
    font-weight: 800;
  }

  .edit-slider {
    margin-bottom: 2px;
  }

  .crop-readout {
    background: var(--accent-soft);
    border-radius: 999px;
    color: var(--accent);
    display: inline-flex;
    font-size: 12px;
    font-weight: 750;
    padding: 7px 11px;
  }

  .split-panel {
    background: #fff;
    border: 1px solid rgba(0, 113, 227, 0.18);
    border-radius: var(--radius-md);
    box-shadow: 0 18px 38px rgba(0, 113, 227, 0.10);
    margin: 0 0 12px;
    overflow: hidden;
    padding: 14px;
  }

  .split-panel[hidden] {
    display: none;
  }

  .split-panel-head {
    align-items: center;
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
  }

  .split-panel-head span {
    color: var(--ink);
    font-size: 15px;
    font-weight: 750;
  }

  .split-panel-head button {
    background: var(--accent-soft);
    border: 0;
    border-radius: 999px;
    color: var(--accent);
    cursor: pointer;
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 700;
    padding: 6px 10px;
  }

  .split-summary {
    color: var(--ink-mute);
    font-size: 13px;
    line-height: 1.45;
    margin-bottom: 12px;
  }

  .split-parts-list {
    display: grid;
    gap: 10px;
  }

  .split-part-row {
    background: #f8fbff;
    border: 1px solid rgba(0, 113, 227, 0.12);
    border-radius: var(--radius-sm);
    padding: 10px;
  }

  .split-part-top {
    align-items: center;
    display: flex;
    gap: 10px;
    justify-content: space-between;
    margin-bottom: 8px;
  }

  .split-part-label {
    color: var(--ink);
    font-size: 13px;
    font-weight: 750;
  }

  .split-part-pages {
    color: var(--ink-mute);
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
  }

  .split-name-input {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 10px;
    color: var(--ink);
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 650;
    margin-bottom: 8px;
    outline: none;
    padding: 10px 11px;
    transition: border-color .16s, box-shadow .16s;
    width: 100%;
  }

  .split-name-input:focus {
    border-color: rgba(0, 113, 227, 0.45);
    box-shadow: 0 0 0 4px var(--accent-soft);
  }

  .split-export-btn {
    padding: 9px 12px;
  }

  .resolution-options.hidden {
    display: none;
  }

  .preview-tools-hidden .zoom-bar {
    display: none;
  }

  .preview-stage.organizing {
    align-items: stretch;
    justify-content: flex-start;
    background: #fff;
    border-radius: var(--radius-md);
    padding: 28px;
  }

  .preview-stage.editing {
    align-items: stretch;
    justify-content: flex-start;
    background: #fff;
    border-radius: var(--radius-md);
    padding: 22px;
  }

  .organizer {
    width: 100%;
    min-height: 100%;
  }

  .page-editor {
    display: flex;
    gap: 20px;
    min-height: 100%;
    width: 100%;
  }

  .page-editor-strip {
    display: flex;
    flex-direction: column;
    flex: 0 0 168px;
    gap: 12px;
    max-height: 100%;
    overflow: auto;
    padding: 2px 8px 2px 2px;
  }

  .page-editor-main {
    align-items: center;
    background: #f5f5f7;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    flex: 1 1 auto;
    gap: 16px;
    justify-content: center;
    min-width: 0;
    overflow: auto;
    padding: 24px;
  }

  .page-editor-canvas-wrap {
    background: #fff;
    border-radius: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06), 0 18px 46px rgba(0, 0, 0, 0.13);
    display: none;
    flex-shrink: 0;
    max-height: 100%;
    max-width: 100%;
    overflow: visible;
    position: relative;
  }

  .page-editor-canvas-wrap canvas {
    display: block;
    height: auto;
    max-height: calc(var(--preview-stage-height, 760px) - 96px);
    max-width: 100%;
    width: auto;
  }

  .page-editor-canvas-wrap.zoomed,
  .page-editor-canvas-wrap.zoomed canvas {
    max-height: none;
    max-width: none;
  }

  .crop-overlay {
    --crop-left: 0%;
    --crop-top: 0%;
    --crop-right: 0%;
    --crop-bottom: 0%;
    inset: 0;
    pointer-events: none;
    position: absolute;
    z-index: 3;
  }

  .crop-overlay[hidden] {
    display: none;
  }

  .crop-shade {
    background: rgba(0, 0, 0, .18);
    position: absolute;
  }

  .crop-shade-top {
    height: var(--crop-top);
    inset: 0 0 auto;
  }

  .crop-shade-right {
    bottom: var(--crop-bottom);
    right: 0;
    top: var(--crop-top);
    width: var(--crop-right);
  }

  .crop-shade-bottom {
    bottom: 0;
    height: var(--crop-bottom);
    left: 0;
    right: 0;
  }

  .crop-shade-left {
    bottom: var(--crop-bottom);
    left: 0;
    top: var(--crop-top);
    width: var(--crop-left);
  }

  .crop-box {
    --crop-bar: #8e8e93;
    --crop-bar-shadow: 0 1px 3px rgba(255, 255, 255, .36), 0 2px 8px rgba(0, 0, 0, .12);
    border: 0;
    border-radius: 0;
    box-shadow: none;
    cursor: move;
    pointer-events: auto;
    position: absolute;
    touch-action: none;
  }

  .crop-box::before,
  .crop-box::after {
    content: "";
    inset: 33.333% 0 33.333%;
    pointer-events: none;
    position: absolute;
  }

  .crop-box::before {
    border-top: 1px solid rgba(255, 255, 255, .42);
    border-bottom: 1px solid rgba(255, 255, 255, .42);
  }

  .crop-box::after {
    border-left: 1px solid rgba(255, 255, 255, .42);
    border-right: 1px solid rgba(255, 255, 255, .42);
    inset: 0 33.333%;
  }

  .crop-edge,
  .crop-handle {
    pointer-events: auto;
    position: absolute;
    touch-action: none;
  }

  .crop-edge-n,
  .crop-edge-s {
    height: 18px;
    left: 20px;
    right: 20px;
  }

  .crop-edge-n { cursor: ns-resize; top: -9px; }
  .crop-edge-s { bottom: -9px; cursor: ns-resize; }

  .crop-edge-e,
  .crop-edge-w {
    bottom: 20px;
    top: 20px;
    width: 18px;
  }

  .crop-edge-e { cursor: ew-resize; right: -9px; }
  .crop-edge-w { cursor: ew-resize; left: -9px; }

  .crop-handle {
    background: var(--crop-bar);
    border: 0;
    border-radius: 1px;
    box-shadow: var(--crop-bar-shadow);
  }

  .crop-handle-n,
  .crop-handle-s {
    height: 6px;
    left: 50%;
    width: 56px;
  }

  .crop-handle-n { cursor: ns-resize; top: -6px; transform: translateX(-50%); }
  .crop-handle-s { bottom: -6px; cursor: ns-resize; transform: translateX(-50%); }

  .crop-handle-e,
  .crop-handle-w {
    height: 56px;
    top: 50%;
    width: 6px;
  }

  .crop-handle-e { cursor: ew-resize; right: -6px; transform: translateY(-50%); }
  .crop-handle-w { cursor: ew-resize; left: -6px; transform: translateY(-50%); }

  .crop-handle-nw,
  .crop-handle-ne,
  .crop-handle-se,
  .crop-handle-sw {
    background: transparent;
    border-color: var(--crop-bar);
    border-radius: 0;
    border-style: solid;
    box-shadow: none;
    height: 44px;
    width: 44px;
  }

  .crop-handle-nw {
    border-width: 6px 0 0 6px;
    cursor: nwse-resize;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, .16));
    left: -6px;
    top: -6px;
  }

  .crop-handle-ne {
    border-width: 6px 6px 0 0;
    cursor: nesw-resize;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, .16));
    right: -6px;
    top: -6px;
  }

  .crop-handle-se {
    border-width: 0 6px 6px 0;
    bottom: -6px;
    cursor: nwse-resize;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, .16));
    right: -6px;
  }

  .crop-handle-sw {
    border-width: 0 0 6px 6px;
    bottom: -6px;
    cursor: nesw-resize;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, .16));
    left: -6px;
  }

  .crop-overlay.dragging .crop-box {
    box-shadow: none;
  }

  .page-editor-bottom {
    align-items: center;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--line);
    border-radius: 999px;
    display: none;
    gap: 12px;
    max-width: 760px;
    padding: 9px 12px;
    width: min(100%, 760px);
  }

  .page-editor-bottom .slider {
    flex: 1 1 auto;
    height: 22px;
    min-width: 120px;
  }

  .page-editor-bottom button {
    align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink);
    cursor: pointer;
    display: inline-flex;
    flex: 0 0 42px;
    font-size: 15px;
    font-weight: 800;
    height: 34px;
    justify-content: center;
  }

  .page-editor-bottom button:hover:not(:disabled) {
    background: var(--accent-soft);
    color: var(--accent);
  }

  .page-editor-bottom button:disabled {
    cursor: not-allowed;
    opacity: .45;
  }

  .page-editor-bottom b {
    color: var(--accent);
    flex: 0 0 48px;
    font-size: 12px;
    font-weight: 800;
    text-align: center;
  }

  .page-edit-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    cursor: pointer;
    flex: 0 0 auto;
    overflow: hidden;
    text-align: left;
    transition: box-shadow .16s, border-color .16s, transform .16s;
  }

  .page-edit-card:hover {
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.12);
    transform: translateY(-1px);
  }

  .page-edit-card.active {
    border-color: rgba(0, 113, 227, 0.72);
    box-shadow: 0 0 0 4px var(--accent-soft), 0 14px 34px rgba(0, 113, 227, 0.16);
  }

  .page-edit-card .page-card-actions {
    gap: 8px;
    min-height: 46px;
  }

  .page-edit-card .page-number {
    font-size: 22px;
  }

  .page-edit-card .page-thumb {
    aspect-ratio: auto;
    height: 216px;
    min-height: 216px;
    object-fit: contain;
  }

  .page-edit-card .page-thumb-placeholder {
    min-height: 216px;
  }

  .page-edit-badge {
    color: var(--ink-mute);
    font-size: 11px;
    font-weight: 750;
  }

  .organizer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 24px;
    align-items: start;
    position: relative;
    touch-action: none;
    user-select: none;
    width: 100%;
  }

  .organizer-empty {
    color: var(--ink-mute);
    display: none;
    font-size: 18px;
    font-weight: 700;
    padding: 80px 24px;
    text-align: center;
  }

  .organizer-empty.on {
    display: block;
  }

  .page-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: 0 12px 34px rgba(0, 0, 0, 0.10);
    cursor: grab;
    overflow: hidden;
    transform: translateZ(0);
    transition: box-shadow .16s, opacity .16s, transform .18s cubic-bezier(.2, .8, .2, 1);
    will-change: transform;
  }

  .page-card:hover:not(.page-placeholder) {
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.14);
    transform: translateY(-2px);
  }

  .page-card:active {
    cursor: grabbing;
  }

  .page-card.page-placeholder {
    align-items: stretch;
    background: transparent;
    border: 0;
    box-shadow: none;
    cursor: default;
    display: flex;
    justify-content: center;
    min-height: 260px;
    overflow: visible;
    pointer-events: none;
  }

  .page-insert-marker {
    align-self: stretch;
    background: var(--accent);
    border-radius: 999px;
    box-shadow: 0 0 0 5px var(--accent-soft), 0 12px 24px rgba(0, 113, 227, .22);
    margin: 8px 0;
    width: 5px;
  }

  .page-split-divider {
    align-items: center;
    color: var(--ink-mute);
    display: flex;
    font-size: 12px;
    font-weight: 700;
    gap: 14px;
    grid-column: 1 / -1;
    margin: 4px 0 2px;
    min-height: 34px;
    pointer-events: auto;
  }

  .page-split-divider::before,
  .page-split-divider::after {
    background: linear-gradient(90deg, rgba(0, 113, 227, 0), rgba(0, 113, 227, 0.55));
    border-radius: 999px;
    content: "";
    flex: 1;
    height: 2px;
  }

  .page-split-divider::after {
    background: linear-gradient(90deg, rgba(0, 113, 227, 0.55), rgba(0, 113, 227, 0));
  }

  .page-split-label {
    align-items: center;
    background: var(--accent-soft);
    border: 1px solid rgba(0, 113, 227, 0.16);
    border-radius: 999px;
    color: var(--accent);
    display: inline-flex;
    gap: 8px;
    padding: 6px 10px;
  }

  .page-split-remove {
    align-items: center;
    background: rgba(0, 113, 227, 0.12);
    border: 0;
    border-radius: 50%;
    color: var(--accent);
    cursor: pointer;
    display: inline-flex;
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 800;
    height: 18px;
    justify-content: center;
    line-height: 1;
    padding: 0;
    width: 18px;
  }

  .page-split-remove:hover {
    background: rgba(0, 113, 227, 0.2);
  }

  .page-thumb {
    background: #fff;
    display: block;
    width: 100%;
    aspect-ratio: 0.72;
    height: auto;
    object-fit: contain;
  }

  .page-thumb-placeholder {
    align-items: center;
    background-color: #fff;
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
    color: var(--ink-mute);
    display: flex;
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 750;
    justify-content: center;
    letter-spacing: .08em;
    text-transform: uppercase;
  }

  .page-card-actions {
    align-items: center;
    background: rgba(255, 255, 255, 0.94);
    display: flex;
    justify-content: space-between;
    padding: 8px 10px;
  }

  .page-number {
    color: #2997bd;
    font-size: 28px;
    font-weight: 700;
    line-height: 1;
  }

  .page-delete {
    align-items: center;
    background: #fff;
    border: 2px solid rgba(41, 151, 189, 0.45);
    border-radius: 50%;
    color: #2997bd;
    cursor: pointer;
    display: inline-flex;
    font-size: 20px;
    font-weight: 700;
    height: 34px;
    justify-content: center;
    line-height: 1;
    width: 34px;
  }

  .page-delete:hover {
    background: #e8f7ff;
    border-color: rgba(41, 151, 189, 0.72);
  }

  .page-split-toggle {
    align-items: center;
    background: #fff;
    border: 1px solid rgba(0, 113, 227, 0.30);
    border-radius: 999px;
    color: var(--accent);
    cursor: pointer;
    display: inline-flex;
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 750;
    height: 34px;
    justify-content: center;
    line-height: 1;
    padding: 0 10px;
  }

  .page-split-toggle:hover:not(:disabled),
  .page-split-toggle[aria-pressed="true"] {
    background: var(--accent-soft);
    border-color: rgba(0, 113, 227, 0.58);
  }

  .page-split-toggle:disabled {
    cursor: not-allowed;
    opacity: .45;
  }

  .page-drag-clone {
    border-radius: 14px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.22);
    cursor: grabbing;
    left: 0;
    opacity: .98;
    pointer-events: none;
    position: fixed;
    top: 0;
    transform: translate3d(0, 0, 0) scale(1.02);
    transform-origin: top left;
    z-index: 9999;
  }

  .page-drag-clone .page-delete,
  .page-drag-clone .page-split-toggle {
    pointer-events: none;
  }

  .page-context-menu {
    background: rgba(255, 255, 255, .92);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: 0 18px 44px rgba(0, 0, 0, .16);
    min-width: 190px;
    padding: 6px;
    position: fixed;
    z-index: 10000;
    backdrop-filter: blur(20px) saturate(1.25);
  }

  .page-context-menu[hidden] {
    display: none;
  }

  .page-context-menu button {
    background: transparent;
    border: 0;
    border-radius: 10px;
    color: var(--ink);
    cursor: pointer;
    display: block;
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 650;
    padding: 10px 11px;
    text-align: left;
    width: 100%;
  }

  .page-context-menu button:hover:not(:disabled) {
    background: var(--accent-soft);
    color: var(--accent);
  }

  .page-context-menu button:disabled {
    color: var(--ink-mute);
    cursor: not-allowed;
    opacity: .55;
  }

  body.dark-mode header.masthead {
    background: rgba(38, 38, 41, 0.78);
  }

  body.dark-mode .tool-nav,
  body.dark-mode .drop,
  body.dark-mode .filecard,
  body.dark-mode .organize-summary,
  body.dark-mode .edit-controls,
  body.dark-mode .quality-toggle,
  body.dark-mode .split-panel,
  body.dark-mode .split-part-row,
  body.dark-mode .merge-file,
  body.dark-mode .pagenav,
  body.dark-mode .zoom-bar,
  body.dark-mode .advanced-toggle,
  body.dark-mode .advanced-panel,
  body.dark-mode .page-card,
  body.dark-mode .page-edit-card,
  body.dark-mode .page-context-menu,
  body.dark-mode .theme-toggle {
    background: #242426;
  }

  body.dark-mode .drop {
    border-color: var(--line-strong);
    box-shadow: none;
  }

  body.dark-mode .panel-left {
    background: #1a1a1c;
  }

  body.dark-mode .panel-right {
    background: #171719;
  }

  body.dark-mode .preview-stage,
  body.dark-mode .preview-stage.organizing,
  body.dark-mode .preview-stage.editing,
  body.dark-mode .page-editor-main {
    background: #202023;
  }

  body.dark-mode .btn-secondary,
  body.dark-mode .toggle,
  body.dark-mode .zoom-btn,
  body.dark-mode .pagenav button,
  body.dark-mode .page-editor-bottom,
  body.dark-mode .page-editor-bottom button,
  body.dark-mode .file-name-input,
  body.dark-mode .split-name-input,
  body.dark-mode .advanced-password,
  body.dark-mode .advanced-text-input,
  body.dark-mode .crop-readout {
    background: #2c2c2e;
    color: var(--ink);
  }

  body.dark-mode .pagenav,
  body.dark-mode .zoom-bar {
    border-color: var(--line);
  }

  body.dark-mode .pagenav .num,
  body.dark-mode .zoom-val {
    color: var(--ink);
  }

  body.dark-mode .btn-secondary:hover:not(:disabled),
  body.dark-mode .toggle:hover,
  body.dark-mode .zoom-btn:hover:not(:disabled),
  body.dark-mode .pagenav button:hover:not(:disabled),
  body.dark-mode .page-editor-bottom button:hover:not(:disabled),
  body.dark-mode .advanced-toggle:hover,
  body.dark-mode .theme-toggle:hover {
    background: #303033;
  }

  body.dark-mode .language-switcher button:hover,
  body.dark-mode .language-switcher button[aria-pressed="true"] {
    color: var(--ink);
  }

  body.dark-mode .tool-indicator,
  body.dark-mode .toggle.on,
  body.dark-mode .btn-print {
    background: #3a3a3c;
    color: #fff;
  }

  body.dark-mode .btn-print {
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.26);
  }

  body.dark-mode .tool-tab.active {
    color: #fff;
  }

  body.dark-mode .btn-print:hover:not(:disabled),
  body.dark-mode .btn-secondary-accent,
  body.dark-mode .btn-secondary-accent:hover:not(:disabled) {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
  }

  body.dark-mode .btn-print:hover:not(:disabled) {
    box-shadow: 0 10px 24px rgba(0, 113, 227, 0.18);
  }

  body.dark-mode .filecard .name:hover,
  body.dark-mode .filecard .name:focus {
    background: #2c2c2e;
  }

  body.dark-mode .page-card-actions {
    background: rgba(36, 36, 38, 0.94);
  }

  body.dark-mode .loader {
    background: rgba(28, 28, 30, 0.88);
  }

  body.dark-mode .theme-toggle-track {
    background: var(--accent);
  }

  body.dark-mode .theme-toggle-thumb {
    transform: translateX(20px);
  }

  @media (max-width: 700px) {
    .organizer-grid {
      grid-template-columns: repeat(auto-fill, minmax(136px, 1fr));
      gap: 18px;
    }

    .preview-stage.organizing {
      padding: 18px;
    }

    .preview-stage.editing {
      padding: 16px;
    }

    .page-editor {
      flex-direction: column;
    }

    .page-editor-strip {
      display: flex;
      flex: 0 0 auto;
      overflow-x: auto;
      overflow-y: hidden;
      padding: 2px 2px 8px;
    }

    .page-edit-card {
      flex: 0 0 136px;
    }

    .page-edit-card .page-thumb,
    .page-edit-card .page-thumb-placeholder {
      height: 188px;
      min-height: 188px;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    header.masthead,
    h1.title {
      transition: none;
    }
  }