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

:root {
  --cu-moss: #a3b18a;
  --cu-moss-mid: #8a9a5b;
  --cu-moss-deep: #3b4d30;
  --cu-moss-border: rgba(163, 177, 138, 0.38);
  --cu-moss-fill: rgba(163, 177, 138, 0.16);
  --cu-moss-fill-strong: rgba(163, 177, 138, 0.28);
}

html, body {
  min-height: 100%;
  color: #e0e0e0;
  font-family: "Pixelify Sans", "Segoe UI", sans-serif;
  background:
    linear-gradient(to right, rgba(6, 8, 5, 0.62) 0%, rgba(10, 14, 8, 0.28) 26%, rgba(10, 14, 8, 0.28) 74%, rgba(6, 8, 5, 0.62) 100%),
    linear-gradient(rgba(8, 12, 6, 0.28), rgba(6, 8, 5, 0.55)),
    url("cave-bg.jpg") center center / cover no-repeat fixed;
}

header {
  position: fixed;
  top: 0;
  width: 100%;
  height: 60px;
  background: rgba(17, 24, 39, 0.7);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
}

.title-center {
  color: var(--cu-moss);
  font-family: "Pixelify Sans", "Segoe UI", sans-serif;
  font-size: 32px;
  letter-spacing: 0.06em;
  text-align: center;
  white-space: nowrap;
}

.container {
  width: min(96vw, 980px);
  margin: 80px auto 24px;
  padding: 0 20px 24px;
}

.status-line {
  margin-bottom: 12px;
  color: #cbd5e1;
}

.tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.tab-btn {
  border: 1px solid var(--cu-moss-border);
  background: rgba(17, 24, 39, 0.75);
  color: #e0e0e0;
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  font-family: "Pixelify Sans", "Segoe UI", sans-serif;
}

.tab-btn.active {
  background: var(--cu-moss-fill-strong);
  color: #fff;
}

.panel {
  background: rgba(17, 24, 39, 0.82);
  border: 1px solid var(--cu-moss-border);
  border-radius: 12px;
  padding: 16px;
}

.panel-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.panel-meta {
  color: #94a3b8;
  font-size: 0.92rem;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.color-field {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--cu-moss);
  font-size: 0.92rem;
}

.color-field input {
  width: 42px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--cu-moss-border);
  background: transparent;
  cursor: pointer;
}

.moss-btn {
  font-family: "Pixelify Sans", "Segoe UI", sans-serif;
  font-size: 0.95rem;
  color: var(--cu-moss);
  background: var(--cu-moss-fill);
  border: 1px solid var(--cu-moss-border);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}

.moss-btn:hover,
.tab-btn:hover {
  background: var(--cu-moss-fill-strong);
}

.swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.swatch {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid var(--cu-moss-border);
  cursor: pointer;
  padding: 0;
}

.swatch.active {
  outline: 2px solid var(--cu-moss);
  outline-offset: 2px;
}

.canvas-wrap {
  overflow: auto;
  background: rgba(8, 12, 6, 0.35);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 8px;
  padding: 16px;
}

canvas {
  display: block;
  margin: 0 auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  cursor: crosshair;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255, 255, 255, 0.05) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255, 255, 255, 0.05) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}