:root {
  --bg:        #080808;
  --surface:   #111113;
  --border:    #1e1e22;
  --border-hi: #333338;
  --text:      #e8e8ec;
  --text-dim:  #50505a;
  --text-mid:  #9898a6;
  --accent:    #7c7cff;
  --radius:    10px;
  --gap:       14px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 16px 32px;
  gap: 16px;
}

/* ── Header ── */
header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  margin-bottom: 4px;
}

header h1 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.45em;
  color: var(--text-dim);
  text-transform: uppercase;
}

header p {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: #2a2a30;
}

/* ── Preview area ── */
#canvas-area {
  width: 100%;
  max-width: 720px;
  background: #000;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s;
  position: relative;
}

#canvas-area.drag-over {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent) inset, 0 0 24px -4px var(--accent)33;
}

#ascii-out {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  white-space: pre;
  line-height: 1;
  padding: 8px;
  font-size: 7px;
  letter-spacing: 0.5px;
  overflow: hidden;
  display: block;
  width: 100%;
}

#placeholder {
  color: var(--text-dim);
  font-size: 12px;
  letter-spacing: 0.15em;
  padding: 48px 20px;
  text-align: center;
  pointer-events: none;
  line-height: 2;
}

#placeholder small {
  font-size: 10px;
  color: #222228;
  letter-spacing: 0.2em;
}

/* ── Controls panel ── */
#controls {
  width: 100%;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── Upload button ── */
#upload-btn {
  width: 100%;
  padding: 13px;
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 0.2em;
  cursor: pointer;
  border: 1px solid var(--border-hi);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-mid);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  text-transform: uppercase;
}
#upload-btn:hover {
  background: #18181c;
  color: var(--text);
  border-color: #444;
}
#upload-btn:active { background: #1f1f24; }

/* ── Card grouping ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.card-title {
  font-size: 9px;
  letter-spacing: 0.4em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 2px;
}

/* ── Sliders ── */
.ctrl-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ctrl-label {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.ctrl-label span {
  color: var(--text-mid);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

input[type=range] {
  -webkit-appearance: none;
  width: 100%;
  height: 2px;
  background: var(--border-hi);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text);
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
}
input[type=range]:hover::-webkit-slider-thumb {
  background: #fff;
  transform: scale(1.1);
}
input[type=range]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text);
  cursor: pointer;
  border: none;
}

.row2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

/* ── Text input ── */
#chars-input {
  font-family: inherit;
  font-size: 13px;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 12px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  letter-spacing: 0.15em;
  transition: border-color 0.15s;
}
#chars-input:focus { border-color: var(--border-hi); }

#file-input { display: none; }

/* ── Toggles ── */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.toggle-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  text-transform: uppercase;
  cursor: pointer;
  user-select: none;
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.toggle-item:has(input:checked) {
  color: var(--accent);
  border-color: var(--accent)55;
  background: var(--accent)0d;
}
.toggle-item:hover {
  border-color: var(--border-hi);
  color: var(--text-mid);
}
.toggle-item input[type=checkbox] {
  display: none;
}

/* ── Action buttons ── */
.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.action-btn {
  padding: 10px;
  font-family: inherit;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text-dim);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.action-btn:hover:not(:disabled) {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-hi);
}
.action-btn:active:not(:disabled) { background: #1a1a1e; }
.action-btn:disabled { opacity: 0.25; cursor: default; }

/* ── Footer ── */
footer {
  font-size: 9px;
  color: #222228;
  letter-spacing: 0.3em;
  padding-top: 4px;
  text-transform: uppercase;
}

/* ── Toast ── */
#toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: var(--surface);
  color: var(--text-mid);
  font-family: inherit;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 9px 18px;
  border-radius: 6px;
  border: 1px solid var(--border-hi);
  opacity: 0;
  transition: opacity 0.18s, transform 0.18s;
  pointer-events: none;
}
#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}