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

html, body {
  margin: 0;
  padding: 0;
  height: 100vh;
  overflow: hidden;
  font-family: sans-serif;
  background: #1a1a1a;
  color: #fff;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ── Header ── */
#app-header {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  border-bottom: 1px solid #333;
  flex-shrink: 0;
  background: #1a1a1a;
}

#app-header h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.3px;
  color: #fff;
}

#app-header p {
  margin: 2px 0 0;
  color: #888;
  font-size: 12px;
}

/* ── Main row (sidebar + canvas) ── */
#main {
  display: flex;
  flex: 1;
  min-height: 0;
}

/* ── Left sidebar panel ── */
#panel {
  display: flex;
  flex-direction: column;
  width: 240px;
  flex-shrink: 0;
  border-right: 1px solid #333;
  background: #1a1a1a;
  overflow-y: auto;
}

/* ── Controls ── */
#controls {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #aaa;
  padding-top: 6px;
  border-top: 1px solid #333;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.control-group > label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #555;
  display: flex;
  align-items: center;
  gap: 6px;
}

.val {
  color: #0010ff;
  font-weight: 700;
}

.text-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

#text-input {
  flex: 1;
  resize: none;
  font-family: sans-serif;
  font-size: 12px;
  border: 1px solid #d0d0d0;
  border-radius: 4px;
  padding: 6px 8px;
  outline: none;
  line-height: 1.4;
}

#text-input:focus {
  border-color: #0010ff;
}

input[type="range"] {
  width: 100%;
  accent-color: #0010ff;
  cursor: pointer;
}

/* ── Presets ── */
.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

/* ── Actions (bottom of sidebar) ── */
#actions {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid #e0e0e0;
}

/* ── Canvas area ── */
#canvas-container {
  flex: 1;
  overflow: auto;
  background: #fff;
  min-width: 0;
}

#canvas-container canvas {
  display: block;
  min-width: 100%;
  min-height: 100%;
}

/* ── Buttons ── */
button {
  cursor: pointer;
  border: 1px solid #d0d0d0;
  border-radius: 4px;
  padding: 6px 12px;
  background: #3a3a3a;
  font-size: 12px;
  color: #fff;
  transition: background 0.12s, border-color 0.12s;
  white-space: nowrap;
  font-family: sans-serif;
}

button:hover {
  background: #f0f0f0;
  border-color: #bbb;
}

button:active {
  background: #e4e4e4;
}

#btn-randomize,
#btn-export-png,
#btn-export-svg {
  width: 100%;
  text-align: center;
  padding: 8px 12px;
}

#btn-randomize {
  background: #0010ff;
  color: #fff;
  border-color: #0010ff;
}

#btn-randomize:hover {
  background: #0009d4;
  border-color: #0009d4;
}

#preset-example {
  background: #3a3a3a;
  color: #fff;
  border-color: #555;
}