:root {
    color-scheme: light;
    --paper: #f4ede0;
    --paper-soft: #ece4d2;
    --rule: #d6ccb5;
    --rule-strong: #a89a7a;
    --ink: #1b1915;
    --ink-soft: #5c5446;
    --muted: #867c67;
    --accent: #5a6f3a;   /* sage — echoes the grass */
    --accent-warm: #a85a2c; /* oxide — for alerts / reset */
    --highlight: #b8402a;
    --paper-rgb: 244, 237, 224;
    --ink-rgb: 27, 25, 21;
    --highlight-rgb: 184, 64, 42;
    --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
    --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  }
  :root[data-theme="dark"] {
    color-scheme: dark;
    --paper: #171a18;
    --paper-soft: #222720;
    --rule: #394235;
    --rule-strong: #6d7b5f;
    --ink: #f3ead7;
    --ink-soft: #c6baa0;
    --muted: #988d76;
    --accent: #a9c46e;
    --accent-warm: #e28a52;
    --highlight: #f07b5a;
    --paper-rgb: 23, 26, 24;
    --ink-rgb: 243, 234, 215;
    --highlight-rgb: 240, 123, 90;
  }
  * { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; height: 100%; }
  body {
    background: var(--paper);
    background-image:
      radial-gradient(ellipse at top left, rgba(90,111,58,0.06), transparent 55%),
      radial-gradient(ellipse at bottom right, rgba(168,90,44,0.05), transparent 55%);
    color: var(--ink);
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.5;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow: hidden;
  }
  /* subtle grain */
  body::before {
    content: "";
    position: fixed; inset: 0;
    pointer-events: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.1  0 0 0 0 0.1  0 0 0 0 0.1  0 0 0 0.06 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
    opacity: 0.35;
    mix-blend-mode: multiply;
    z-index: 1;
  }
  :root[data-theme="dark"] body::before {
    opacity: 0.22;
    mix-blend-mode: screen;
  }
  .app { position: relative; z-index: 2; display: flex; flex-direction: column; height: 100vh; }

  /* ───────── Header ───────── */
  header {
    display: grid;
    grid-template-columns: auto minmax(180px, 1fr) auto;
    align-items: end;
    gap: 32px;
    padding: 22px 28px 18px;
    border-bottom: 1px solid var(--rule);
  }
  .title-block { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
  .eyebrow {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--muted);
  }
  h1 {
    font-family: var(--serif);
    font-weight: 800;
    font-style: italic;
    font-size: 34px;
    line-height: 1;
    margin: 0;
    letter-spacing: -0.01em;
  }
  h1 em {
    font-style: normal;
    color: var(--accent);
  }
  .subtitle {
    font-family: var(--serif);
    font-style: italic;
    font-size: 13px;
    color: var(--ink-soft);
    margin-top: 4px;
  }

  /* Progress */
  .progress-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 0;
  }
  .progress-numbers {
    display: flex;
    align-items: baseline;
    gap: 16px;
    font-family: var(--mono);
  }
  .progress-count {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.01em;
  }
  .progress-count .total { color: var(--muted); font-weight: 400; }
  .progress-percent {
    font-family: var(--serif);
    font-style: italic;
    font-size: 20px;
    color: var(--accent);
    font-weight: 600;
  }
  .progress-remaining {
    font-size: 11px;
    color: var(--muted);
    margin-left: auto;
    white-space: nowrap;
  }
  .progress-bar {
    height: 6px;
    background: var(--paper-soft);
    border: 1px solid var(--rule);
    position: relative;
    overflow: hidden;
  }
  .progress-bar .fill {
    position: absolute; inset: 0 auto 0 0;
    background: var(--accent);
    width: 0%;
    transition: width 220ms ease;
  }

  /* Controls */
  .controls { display: flex; gap: 8px; align-items: center; justify-content: flex-end; min-width: 0; }
  .btn {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--rule-strong);
    padding: 8px 12px;
    cursor: pointer;
    transition: all 140ms ease;
  }
  .btn:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
  .btn:disabled {
    opacity: 0.38;
    cursor: not-allowed;
  }
  .btn:disabled:hover {
    background: transparent;
    color: var(--ink);
    border-color: var(--rule-strong);
  }
  .btn.pressed { background: var(--ink); color: var(--paper); border-color: var(--ink); }
  .btn.warn { color: var(--accent-warm); border-color: var(--accent-warm); }
  .btn.warn:hover { background: var(--accent-warm); color: var(--paper); }
  .btn-group { display: flex; }
  .btn-group .btn { border-right: none; }
  .btn-group .btn:last-child { border-right: 1px solid var(--rule-strong); }
  .btn-group .btn.pressed + .btn { border-left-color: var(--ink); }
  .zoom-level {
    font-family: var(--mono);
    font-size: 11px;
    padding: 0 10px;
    min-width: 44px;
    text-align: center;
    color: var(--muted);
    border: 1px solid var(--rule-strong);
    border-left: none;
    border-right: none;
    display: flex; align-items: center; justify-content: center;
  }

  /* ───────── Main ───────── */
  main {
    flex: 1;
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 0;
    min-width: 0;
  }

  /* Palette */
  aside {
    border-right: 1px solid var(--rule);
    background: var(--paper-soft);
    display: flex;
    flex-direction: column;
    min-height: 0;
  }
  .palette-header {
    padding: 16px 18px 10px;
    border-bottom: 1px solid var(--rule);
  }
  .palette-header h2 {
    font-family: var(--serif);
    font-weight: 600;
    font-size: 15px;
    margin: 0;
    letter-spacing: -0.01em;
  }
  .palette-header .hint {
    font-size: 10px;
    color: var(--muted);
    margin-top: 2px;
    font-family: var(--mono);
  }
  .palette-list {
    list-style: none;
    margin: 0;
    padding: 6px 0;
    overflow-y: auto;
    flex: 1;
  }
  .palette-list::-webkit-scrollbar { width: 8px; }
  .palette-list::-webkit-scrollbar-track { background: transparent; }
  .palette-list::-webkit-scrollbar-thumb { background: var(--rule-strong); }
  .palette-item {
    display: grid;
    grid-template-columns: 20px 1fr auto;
    align-items: center;
    gap: 10px;
    padding: 7px 18px;
    cursor: pointer;
    border-left: 2px solid transparent;
    transition: background 120ms, border-color 120ms;
  }
  .palette-item:hover { background: rgba(0,0,0,0.04); }
  :root[data-theme="dark"] .palette-item:hover { background: rgba(255,255,255,0.05); }
  .palette-item.focused {
    background: rgba(90, 111, 58, 0.1);
    border-left-color: var(--accent);
  }
  :root[data-theme="dark"] .palette-item.focused { background: rgba(169, 196, 110, 0.14); }
  .swatch {
    width: 18px; height: 18px;
    border: 1px solid rgba(0,0,0,0.2);
    box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset;
  }
  :root[data-theme="dark"] .swatch {
    border-color: rgba(255,255,255,0.25);
    box-shadow: 0 1px 0 rgba(255,255,255,0.18) inset;
  }
  .palette-label {
    display: flex;
    flex-direction: column;
    min-width: 0;
  }
  .palette-name {
    font-family: var(--serif);
    font-size: 13px;
    line-height: 1.1;
  }
  .palette-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 2px;
  }
  .palette-hex {
    font-family: var(--mono);
    font-size: 9px;
    color: var(--muted);
    letter-spacing: 0.04em;
  }
  .code-input {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 600;
    width: 56px;
    padding: 1px 5px;
    border: 1px dashed var(--rule-strong);
    background: transparent;
    color: var(--accent-warm);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border-radius: 2px;
    transition: all 120ms ease;
  }
  .code-input:hover { background: rgba(0,0,0,0.03); border-color: var(--rule-strong); }
  :root[data-theme="dark"] .code-input:hover { background: rgba(255,255,255,0.05); }
  .code-input:focus {
    outline: none;
    border-style: solid;
    border-color: var(--ink);
    background: var(--paper);
    color: var(--ink);
  }
  .code-input::placeholder { color: var(--muted); opacity: 0.55; font-weight: 400; }
  .code-input.set { border-style: solid; border-color: var(--accent-warm); }
  .palette-item.focused .code-input.set {
    background: var(--accent-warm);
    color: var(--paper);
    border-color: var(--accent-warm);
  }

  .focus-banner {
    display: none;
    align-items: center;
    gap: 14px;
    padding: 10px 28px;
    background: var(--ink);
    color: var(--paper);
    border-bottom: 1px solid var(--ink);
  }
  .focus-banner.show { display: flex; }
  .focus-banner .fb-label {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    opacity: 0.55;
  }
  .focus-banner .fb-swatch {
    width: 18px; height: 18px;
    border: 1px solid rgba(255,255,255,0.25);
  }
  .focus-banner .fb-name {
    font-family: var(--serif);
    font-style: italic;
    font-size: 16px;
  }
  .focus-banner .fb-code {
    font-family: var(--mono);
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.06em;
    padding: 3px 8px;
    border: 1px solid rgba(255,255,255,0.3);
    color: #ffd4a3;
  }
  .focus-banner .fb-code.unset {
    color: rgba(255,255,255,0.45);
    font-style: italic;
    font-weight: 400;
    letter-spacing: 0;
    border-style: dashed;
  }
  .focus-banner .fb-progress {
    margin-left: auto;
    font-family: var(--mono);
    font-size: 11px;
    opacity: 0.75;
  }
  .palette-count {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--muted);
    text-align: right;
    white-space: nowrap;
  }
  .palette-count strong {
    display: block;
    color: var(--ink);
    font-weight: 600;
    font-size: 11px;
  }
  .palette-count strong.done { color: var(--accent); }
  .palette-actions {
    padding: 10px 18px 14px;
    border-top: 1px solid var(--rule);
    display: flex;
    flex-direction: column;
    gap: 6px;
  }
  .palette-actions .btn { width: 100%; justify-content: center; text-align: center; font-size: 10px; padding: 7px; }
  .palette-actions .btn[disabled] { opacity: 0.35; cursor: not-allowed; }
  .palette-actions .btn[disabled]:hover { background: transparent; color: var(--ink); border-color: var(--rule-strong); }

  /* Canvas area */
  .canvas-area {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 0;
    min-width: 0;
  }
  .canvas-scroll {
    flex: 1;
    display: flex;
    overflow: auto;
    min-width: 0;
    padding: 28px;
    background:
      linear-gradient(var(--paper), var(--paper)),
      repeating-linear-gradient(45deg, transparent, transparent 8px, rgba(0,0,0,0.015) 8px, rgba(0,0,0,0.015) 16px);
    background-blend-mode: normal;
  }
  :root[data-theme="dark"] .canvas-scroll {
    background:
      linear-gradient(var(--paper), var(--paper)),
      repeating-linear-gradient(45deg, transparent, transparent 8px, rgba(255,255,255,0.025) 8px, rgba(255,255,255,0.025) 16px);
  }
  .canvas-scroll::-webkit-scrollbar { width: 10px; height: 10px; }
  .canvas-scroll::-webkit-scrollbar-track { background: var(--paper-soft); }
  .canvas-scroll::-webkit-scrollbar-thumb { background: var(--rule-strong); }

  .canvas-frame {
    position: relative;
    width: max-content;
    height: max-content;
    margin: auto;
    padding: 14px;
    background: var(--paper);
    border: 1px solid var(--rule-strong);
    box-shadow:
      0 1px 0 rgba(255,255,255,0.6) inset,
      0 14px 30px -20px rgba(0,0,0,0.25),
      0 3px 8px -4px rgba(0,0,0,0.15);
  }
  :root[data-theme="dark"] .canvas-frame {
    box-shadow:
      0 1px 0 rgba(255,255,255,0.08) inset,
      0 18px 34px -18px rgba(0,0,0,0.75),
      0 3px 10px -4px rgba(0,0,0,0.55);
  }
  .canvas-frame::before {
    content: "";
    position: absolute; inset: 6px;
    border: 1px solid var(--rule);
    pointer-events: none;
  }
  canvas {
    display: block;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    cursor: crosshair;
    position: relative;
    z-index: 1;
    touch-action: none;   /* let pointer events handle drag on touch/pen */
    user-select: none;
    -webkit-user-select: none;
  }
  canvas.panning { cursor: grabbing; }
  canvas.painting { cursor: cell; }

  /* Footer / readout */
  .readout {
    border-top: 1px solid var(--rule);
    padding: 10px 28px;
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 11px;
    background: var(--paper-soft);
    min-height: 42px;
  }
  .readout-item { display: flex; align-items: center; gap: 8px; }
  .readout-label {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--muted);
  }
  .readout-value {
    font-family: var(--mono);
    color: var(--ink);
  }
  .readout-swatch {
    width: 14px; height: 14px;
    border: 1px solid rgba(0,0,0,0.2);
    display: inline-block;
    vertical-align: middle;
  }
  :root[data-theme="dark"] .readout-swatch { border-color: rgba(255,255,255,0.28); }
  .readout-dim { color: var(--muted); font-style: italic; }
  .readout-spacer { flex: 1; }
  .kbd-hint {
    font-size: 10px;
    color: var(--muted);
  }
  .kbd {
    display: inline-block;
    padding: 1px 5px;
    border: 1px solid var(--rule-strong);
    border-radius: 2px;
    background: var(--paper);
    font-family: var(--mono);
    font-size: 9px;
    margin: 0 2px;
  }

  /* Confirm modal */
  .modal-backdrop {
    position: fixed; inset: 0;
    background: rgba(27,25,21,0.4);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(2px);
  }
  .modal-backdrop.open { display: flex; }
  .modal {
    background: var(--paper);
    border: 1px solid var(--ink);
    padding: 28px 32px;
    max-width: 380px;
    box-shadow: 0 20px 50px -10px rgba(0,0,0,0.3);
  }
  .modal h3 {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 600;
    font-size: 22px;
    margin: 0 0 8px;
  }
  .modal p { margin: 0 0 20px; color: var(--ink-soft); font-size: 12px; line-height: 1.5; }
  .modal-actions { display: flex; gap: 10px; justify-content: flex-end; }

  /* Toast */
  .toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--ink);
    color: var(--paper);
    padding: 10px 18px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    opacity: 0;
    pointer-events: none;
    transition: all 180ms ease;
    z-index: 200;
  }
  .toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }

  /* Complete celebration */
  .complete-banner {
    display: none;
    position: absolute;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: var(--paper);
    padding: 8px 18px;
    font-family: var(--serif);
    font-style: italic;
    font-size: 14px;
    letter-spacing: 0.02em;
    z-index: 10;
    box-shadow: 0 8px 20px -8px rgba(0,0,0,0.3);
  }
  .complete-banner.show { display: block; animation: slideDown 400ms ease; }
  @keyframes slideDown {
    from { transform: translateX(-50%) translateY(-20px); opacity: 0; }
    to { transform: translateX(-50%) translateY(0); opacity: 1; }
  }

  /* App focus mode */
  .focus-toolbar {
    display: none;
    position: fixed;
    top: 14px;
    right: 14px;
    z-index: 50;
    align-items: center;
    gap: 8px;
    padding: 8px;
    background: rgba(244, 237, 224, 0.92);
    border: 1px solid var(--rule-strong);
    box-shadow: 0 12px 28px -18px rgba(0,0,0,0.45);
    backdrop-filter: blur(8px);
  }
  :root[data-theme="dark"] .focus-toolbar {
    background: rgba(23, 26, 24, 0.9);
  }
  .app.focus-mode {
    height: 100vh;
  }
  .app.focus-mode header,
  .app.focus-mode aside,
  .app.focus-mode .readout,
  .app.focus-mode .focus-banner,
  .app.focus-mode .complete-banner {
    display: none !important;
  }
  .app.focus-mode main {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    min-height: 0;
  }
  .app.focus-mode .canvas-area {
    height: 100vh;
  }
  .app.focus-mode .canvas-scroll {
    padding: 24px;
  }
  .app.focus-mode .focus-toolbar {
    display: flex;
  }

  @media (max-width: 1180px) {
    header {
      grid-template-columns: auto minmax(220px, 1fr);
      align-items: end;
      gap: 14px 24px;
    }
    .controls {
      grid-column: 1 / -1;
      flex-wrap: wrap;
    }
  }

  @media (max-width: 820px) {
    header { grid-template-columns: 1fr; gap: 14px; padding: 14px 18px; }
    main { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
    aside { max-height: 40vh; }
    .controls { flex-wrap: wrap; }
    .focus-toolbar {
      left: 10px;
      right: 10px;
      top: 10px;
      flex-wrap: wrap;
      justify-content: flex-end;
    }
  }

  .file-btn {
    align-items: center;
    display: inline-flex;
    flex: 0 0 116px;
    height: 35px;
    justify-content: center;
    position: relative;
    overflow: hidden;
    width: 116px;
  }
  .file-btn input[type=file] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    font-size: 0;
  }
  .design-meta {
    font-size: 10px;
    color: var(--muted);
    margin-top: 4px;
    font-family: var(--mono);
    letter-spacing: 0.03em;
  }
  .design-meta a {
    color: var(--accent-warm);
    font-weight: 600;
    text-decoration: none;
  }
  .design-meta a:hover {
    text-decoration: underline;
  }