/* =========================================================
   Perler Bead Pattern Generator — Vintage Workshop Style
   ========================================================= */

:root {
  --bg: #E8E1D2;
  --bg-2: #F1EBDD;
  --paper: #F5EFE2;
  --ink: #1d1a16;
  --ink-2: #4a443c;
  --ink-3: #7a7268;
  --rule: #C7BFAF;
  --rule-2: #D6CEBE;
  --accent: #C5471F;       /* burnt orange */
  --accent-2: #1d1a16;
  --warn: #B73A1F;
  --good: #5a7a3f;
  --shadow: 0 1px 0 rgba(0,0,0,0.04), 0 6px 14px -8px rgba(40, 30, 20, 0.18);

  --font-display: 'Fraunces', 'Cormorant Garamond', 'Georgia', serif;
  --font-mono: 'Space Mono', 'JetBrains Mono', ui-monospace, monospace;
  --font-body: 'Inter', -apple-system, "PingFang SC", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* paper grain overlay */
body::before {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(120,100,70,0.04) 1px, transparent 1px),
    radial-gradient(circle at 80% 70%, rgba(120,100,70,0.03) 1px, transparent 1px);
  background-size: 3px 3px, 5px 5px;
  z-index: 0;
}

/* =========================================================
   Layout
   ========================================================= */

.app {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 280px 1fr 280px;
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header header header"
    "left   main   right"
    "footer footer footer";
  min-height: 100vh;
  gap: 0;
}

.app-header { grid-area: header; }
.app-left   { grid-area: left;   border-right: 1px solid var(--rule); }
.app-main   { grid-area: main; }
.app-right  { grid-area: right;  border-left: 1px solid var(--rule); }
.app-footer { grid-area: footer; }

/* =========================================================
   Header — magazine masthead
   ========================================================= */

.app-header {
  padding: 18px 28px 16px;
  border-bottom: 2px solid var(--ink);
  background: linear-gradient(to bottom, var(--bg-2) 0%, var(--bg) 100%);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.masthead { display: flex; flex-direction: column; gap: 2px; }

.mast-meta {
  display: flex;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.mast-meta span { display: inline-flex; align-items: center; }
.mast-meta .dot {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--accent); margin-right: 8px;
}

.mast-title {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 600;
  font-style: italic;
  letter-spacing: -0.01em;
  line-height: 1;
  margin: 4px 0 2px;
}

.mast-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.35em;
  color: var(--ink-2);
  text-transform: uppercase;
}

.mast-tagline {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ink-3);
  font-size: 13px;
  margin-top: 2px;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* =========================================================
   Side panels
   ========================================================= */

.panel {
  padding: 18px 22px;
  border-bottom: 1px solid var(--rule);
}
.panel:last-child { border-bottom: none; }

.panel-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
  display: flex; justify-content: space-between; align-items: center;
}
.panel-title::before {
  content: '§';
  color: var(--accent);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 16px;
  margin-right: 8px;
}

.app-left, .app-right {
  background: var(--bg-2);
  overflow-y: auto;
  max-height: calc(100vh - 110px);
}

/* =========================================================
   Tools (icon grid)
   ========================================================= */

.tools {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.tool-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--paper);
  border: 1px solid var(--rule);
  color: var(--ink-2);
  padding: 10px 4px 8px;
  border-radius: 0;
  cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  transition: all 0.15s ease;
  position: relative;
}
.tool-btn .ico { font-size: 16px; line-height: 1; }
.tool-btn:hover { border-color: var(--ink); transform: translateY(-1px); }
.tool-btn.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.tool-btn.active::after {
  content: '';
  position: absolute; left: 4px; right: 4px; bottom: -1px;
  height: 2px; background: var(--accent);
}
.tool-btn .kbd {
  position: absolute;
  top: 3px; right: 4px;
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--ink-3);
  opacity: 0.6;
}
.tool-btn.active .kbd { color: var(--paper); opacity: 0.7; }

/* =========================================================
   Current color display
   ========================================================= */

.current-color {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  background: var(--paper);
  border: 1px solid var(--rule);
  margin-bottom: 12px;
}
.current-color-swatch {
  width: 38px; height: 38px;
  border: 1px solid rgba(0,0,0,0.3);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.5), 0 1px 0 rgba(0,0,0,0.05);
  flex-shrink: 0;
}
.current-color-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.current-color-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}
.current-color-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-style: italic;
  color: var(--ink);
}

/* =========================================================
   Palette grid
   ========================================================= */

.palette-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 3px;
  max-height: 320px;
  overflow-y: auto;
  padding: 2px;
  background: var(--bg-2);
  border: 1px solid var(--rule-2);
}
.palette-grid::-webkit-scrollbar { width: 6px; }
.palette-grid::-webkit-scrollbar-thumb { background: var(--rule); }

.palette-size-row {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  margin: 8px 0;
}
.palette-size-label {
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin-right: 2px;
}
.palette-size-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.swatch {
  aspect-ratio: 1;
  border: 1px solid rgba(0,0,0,0.25);
  cursor: pointer;
  padding: 0;
  position: relative;
  transition: transform 0.1s ease;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.3);
}
.swatch.light { border-color: rgba(0,0,0,0.4); }
.swatch:hover { transform: scale(1.12); z-index: 2; }
.swatch.active {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  z-index: 3;
}

/* =========================================================
   Buttons
   ========================================================= */

.btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 9px 14px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex; align-items: center; gap: 8px;
  border-radius: 0;
  font-weight: 500;
}
.btn:hover:not(:disabled) {
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-1px);
  box-shadow: 2px 2px 0 var(--accent);
}
.btn:disabled { opacity: 0.35; cursor: not-allowed; }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover:not(:disabled) { background: var(--accent); border-color: var(--accent); }

.btn-accent { color: var(--accent); border-color: var(--accent); }
.btn-accent:hover:not(:disabled) { background: var(--accent); color: var(--paper); }

.btn-mini {
  font-size: 9px; padding: 6px 10px; letter-spacing: 0.1em;
}

.btn-row { display: flex; flex-wrap: wrap; gap: 6px; }
.btn-row .btn { flex: 1; min-width: 0; justify-content: center; }
.btn-row .btn .ico { font-size: 14px; }

.btn-stack { display: flex; flex-direction: column; gap: 6px; }
.btn-stack .btn { justify-content: flex-start; width: 100%; }

/* =========================================================
   Size controls
   ========================================================= */

.size-row {
  display: grid;
  grid-template-columns: auto 1fr auto 1fr auto;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}
.size-row label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.input-num {
  background: var(--paper);
  border: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 6px 8px;
  color: var(--ink);
  width: 100%;
  -moz-appearance: textfield;
}
.input-num::-webkit-outer-spin-button,
.input-num::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.input-num:focus { outline: none; border-color: var(--ink); }

.preset-row { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 8px; }

/* =========================================================
   Drop zone
   ========================================================= */

.drop-zone {
  border: 1.5px dashed var(--rule);
  background: var(--paper);
  padding: 24px 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.drop-zone:hover, .drop-zone.drag {
  border-color: var(--accent);
  border-style: solid;
  background: rgba(197, 71, 31, 0.05);
  color: var(--accent);
}
.drop-zone .icon {
  display: block;
  font-size: 26px;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ink-2);
}
.drop-hint {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 12px;
  color: var(--ink-3);
  text-transform: none;
  letter-spacing: 0;
  margin-top: 8px;
}

/* image conversion options */
.img-opts {
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--paper);
  border: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.img-opt-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  cursor: pointer;
}
.img-opt-row input[type="checkbox"] {
  width: 13px; height: 13px;
  accent-color: var(--accent);
  margin: 0;
  flex-shrink: 0;
}
.img-opt-row.slider-row { gap: 8px; }
.img-opt-row > span:first-child { flex: 0 0 50px; }
.input-mini {
  width: 50px !important;
  padding: 4px 6px !important;
  font-size: 11px !important;
  margin-left: auto;
}
.img-opt-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
}
.slider-val {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink);
  min-width: 28px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.input-num:disabled { opacity: 0.4; cursor: not-allowed; }

/* ===== Canvas nav (floating bottom-right): pan + zoom ===== */
.canvas-nav {
  position: fixed;
  right: 18px;
  bottom: 18px;
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: 8px;
  z-index: 50;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 6px 8px;
  box-shadow: 4px 4px 0 var(--accent), 0 6px 14px -8px rgba(40,30,20,0.4);
}
.pan-cross {
  display: grid;
  grid-template-columns: repeat(3, 28px);
  grid-template-rows: repeat(3, 28px);
  gap: 2px;
}
.pan-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--bg-2);
  color: var(--ink);
  border: 1px solid var(--rule);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.08s, transform 0.04s;
}
.pan-btn:hover:not(:disabled) { background: var(--bg); }
.pan-btn:active { transform: scale(0.92); background: var(--accent); color: #fff; }
.pan-btn:disabled { opacity: 0.25; cursor: not-allowed; }
#pan-up     { grid-column: 2; grid-row: 1; }
#pan-left   { grid-column: 1; grid-row: 2; }
#pan-center { grid-column: 2; grid-row: 2; font-size: 8px; }
#pan-right  { grid-column: 3; grid-row: 2; }
#pan-down   { grid-column: 2; grid-row: 3; }

.zoom-cluster {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.zoom-btn {
  width: 34px; height: 34px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
  background: var(--bg-2);
  color: var(--ink);
  border: 1px solid var(--rule);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.08s, transform 0.04s;
}
.zoom-btn:hover { background: var(--bg); }
.zoom-btn:active { transform: scale(0.94); background: var(--accent); color: #fff; }
.zoom-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.zoom-level {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin-top: 2px;
  font-variant-numeric: tabular-nums;
}

.img-opt-hint {
  margin-left: auto;
  width: 14px; height: 14px;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--ink-3);
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: 50%;
  cursor: help;
  flex: 0 0 14px;
}

.select-mini {
  margin-left: auto;
  padding: 4px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  color: var(--ink);
  letter-spacing: 0.04em;
  cursor: pointer;
}
.input-text {
  margin-left: auto;
  flex: 1;
  padding: 4px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  color: var(--ink);
}

/* AI block */
.ai-block {
  margin-top: 10px;
  padding: 8px 12px;
  background: var(--paper);
  border: 1px solid var(--rule);
  font-size: 11px;
}
.ai-block > summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  user-select: none;
  outline: none;
}
.ai-block[open] > summary { color: var(--accent); margin-bottom: 8px; }
.ai-body { display: flex; flex-direction: column; gap: 8px; }
.ai-hint {
  font-size: 10px;
  color: var(--ink-3);
  line-height: 1.4;
  padding: 6px 8px;
  background: var(--bg-2);
  border-left: 2px solid var(--accent);
}
.ai-status {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-3);
  min-height: 14px;
}
.ai-status.error { color: var(--warn); }
.ai-status.success { color: var(--good); }

/* =========================================================
   Main canvas area
   ========================================================= */

.app-main {
  background:
    repeating-linear-gradient(45deg, transparent 0, transparent 19px, rgba(120,100,70,0.025) 19px, rgba(120,100,70,0.025) 20px),
    var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px;
  overflow: auto;
  min-height: 0;
}

.canvas-frame {
  background: #C8C4BC;
  padding: 18px;
  border: 1px solid var(--ink);
  box-shadow:
    0 0 0 4px var(--bg-2),
    0 0 0 5px var(--rule),
    8px 8px 0 var(--accent),
    14px 14px 24px -10px rgba(40, 30, 20, 0.4);
  position: relative;
}

.canvas-frame::before {
  content: 'PEGBOARD · 拼豆板';
  position: absolute;
  top: -10px; left: 14px;
  background: var(--bg);
  padding: 0 8px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.3em;
  color: var(--ink-2);
}

#bead-canvas {
  display: block;
  cursor: crosshair;
  image-rendering: pixelated;
  max-width: 100%;
  height: auto;
}

/* =========================================================
   Stats panel
   ========================================================= */

.stats-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.stat-card {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 10px 12px;
  text-align: center;
  position: relative;
}
.stat-card .num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  font-style: italic;
  line-height: 1;
  color: var(--ink);
  display: block;
  font-variant-numeric: tabular-nums;
}
.stat-card .lbl {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 4px;
  display: block;
}

.stats-list {
  max-height: 280px;
  overflow-y: auto;
  border: 1px solid var(--rule);
  background: var(--paper);
}

.stats-row {
  display: grid;
  grid-template-columns: 16px 42px 1fr auto auto auto;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  font-size: 12px;
  border-bottom: 1px solid var(--rule-2);
  cursor: pointer;
  transition: background 0.1s ease;
}
.stats-row:hover { background: var(--bg-2); }
.stats-row:last-child { border-bottom: none; }
.stats-replace {
  background: none;
  border: 1px solid rgba(0,0,0,0.18);
  border-radius: 3px;
  cursor: pointer;
  padding: 1px 4px;
  font-size: 11px;
  color: var(--ink-3);
  opacity: 0;
  transition: opacity 0.15s;
  line-height: 1.4;
}
.stats-row:hover .stats-replace { opacity: 1; }
.stats-replace:hover { background: var(--bg-3); color: var(--ink); opacity: 1; }

.stats-sw {
  width: 14px; height: 14px;
  border: 1px solid rgba(0,0,0,0.3);
}
.stats-code {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.05em;
}
.stats-name {
  font-family: var(--font-display);
  font-style: italic;
}
.stats-count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  font-weight: 600;
}
.stats-pct {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
  width: 38px;
  text-align: right;
}

.stats-empty {
  padding: 24px 12px;
  text-align: center;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ink-3);
}

/* =========================================================
   Export options
   ========================================================= */

.export-opts {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 10px 12px;
  margin-bottom: 10px;
  display: flex; flex-direction: column; gap: 6px;
}
.export-opts label {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  cursor: pointer;
}
.export-opts input[type="checkbox"] {
  width: 13px; height: 13px;
  accent-color: var(--accent);
  margin: 0;
}

/* =========================================================
   Footer
   ========================================================= */

.app-footer {
  padding: 12px 28px;
  border-top: 2px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  display: flex; justify-content: space-between; align-items: center;
}
.app-footer a { color: var(--bg); text-decoration: underline; text-underline-offset: 3px; }
.app-footer a:hover { color: var(--accent); }
.app-footer .heart { color: var(--accent); }

/* =========================================================
   Scrollbars
   ========================================================= */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-2); }
::-webkit-scrollbar-thumb { background: var(--rule); border: 1px solid var(--bg-2); }
::-webkit-scrollbar-thumb:hover { background: var(--ink-3); }

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 1100px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "left"
      "main"
      "right"
      "footer";
  }
  .app-left, .app-right {
    border: none;
    border-bottom: 1px solid var(--rule);
    max-height: none;
  }
  .palette-grid { grid-template-columns: repeat(10, 1fr); }
  .mast-title { font-size: 28px; }
}

@media (max-width: 600px) {
  .app-header { padding: 14px 16px; flex-direction: column; align-items: flex-start; }
  .panel { padding: 14px 16px; }
  .app-main { padding: 16px; }
  .palette-grid { grid-template-columns: repeat(8, 1fr); }
  .mast-title { font-size: 24px; }
  .canvas-frame { padding: 10px; }
  .canvas-frame::before { font-size: 8px; }
}