:root {
  color-scheme: dark;
  --bg: #0d0f13;
  --panel: #151920;
  --panel-2: #1b2029;
  --line: #2c3340;
  --text: #eef1f6;
  --muted: #9aa6b5;
  --accent: #e0703f;
  --teal: #45c4b0;
  --gold: #e6b84c;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  background: #12151b;
  border-bottom: 1px solid var(--line);
}

.topbar h1 {
  margin: 0;
  font-size: clamp(18px, 2.5vw, 26px);
  letter-spacing: 0;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.runtime-status {
  flex: 0 0 auto;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--gold);
  font-size: 13px;
  white-space: nowrap;
}

.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 16px;
  padding: 16px;
  min-height: 0;
}

.stage-wrap {
  min-width: 0;
  min-height: 0;
}

.stage {
  position: relative;
  width: 100%;
  min-height: 420px;
  max-height: calc(100vh - 130px);
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #05070a;
  border: 1px solid var(--line);
  border-radius: 8px;
}

#camera,
#drawCanvas,
#effectCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#camera {
  transform: scaleX(-1);
}

#drawCanvas,
#effectCanvas {
  pointer-events: none;
}

#effectCanvas {
  z-index: 2;
}

.calibration-target {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(5, 8, 12, 0.28);
}

.calibration-ring {
  width: 96px;
  height: 96px;
  border: 3px dashed rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.12), 0 0 24px rgba(255, 255, 255, 0.25);
  animation: ringPulse 1.1s ease-in-out infinite;
}

@keyframes ringPulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.06);
    opacity: 0.72;
  }
}

.calibration-label {
  padding: 7px 12px;
  border-radius: 6px;
  background: rgba(15, 18, 24, 0.82);
  color: #fff;
  font-size: 14px;
}

.calibration-progress {
  width: 180px;
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
}

.calibration-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--gold);
  transition: width 80ms linear;
}

.brush-status {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 3;
  max-width: calc(100% - 24px);
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  background: rgba(12, 15, 20, 0.78);
  color: #f5f7fa;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brush-size-pill {
  position: absolute;
  right: 12px;
  bottom: 12px;
  z-index: 3;
  min-width: 62px;
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  background: rgba(12, 15, 20, 0.78);
  color: var(--gold);
  font-size: 13px;
  text-align: center;
}

.control-panel {
  min-height: 0;
  max-height: calc(100vh - 130px);
  overflow: auto;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.panel-section + .panel-section {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.panel-section h2 {
  margin: 0 0 12px;
  font-size: 15px;
  color: #dbe1ea;
}

.button-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.button-grid .primary {
  grid-column: 1 / -1;
}

button {
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  transition: border-color 140ms ease, background 140ms ease, transform 140ms ease;
}

button:hover:not(:disabled) {
  border-color: #566174;
  background: #212835;
}

button:active:not(:disabled) {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.48;
  cursor: not-allowed;
}

button.primary {
  border-color: #a84e28;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

button.primary:hover:not(:disabled) {
  border-color: #d37d4f;
  background: #e87f4c;
}

button.danger {
  border-color: #82434c;
  background: #3b252a;
  color: #f0aab2;
}

.status-list {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.status-list div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 36px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--muted);
  font-size: 13px;
}

.status-list strong {
  color: var(--text);
  font-weight: 600;
}

.brush-mode-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.brush-mode {
  min-height: 46px;
}

.brush-mode.active {
  border-color: var(--teal);
  background: #17312e;
  color: #c9fff7;
}

.effect-type-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: 18px;
}

.effect-type {
  min-height: 42px;
}

.effect-type.active {
  border-color: var(--accent);
  background: #34241f;
  color: #ffe0c7;
}

.color-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin-bottom: 18px;
}

.color-swatch {
  aspect-ratio: 1;
  min-height: 34px;
  padding: 0;
  border-radius: 6px;
  border: 2px solid rgba(255, 255, 255, 0.18);
}

.color-swatch.active {
  border-color: #ffffff;
  box-shadow: 0 0 0 2px var(--gold);
}

.brush-size-input {
  width: 100%;
  accent-color: var(--teal);
}

.brush-size-note {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.screenshot-preview {
  display: block;
  width: 100%;
  margin-bottom: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #000;
}

#saveScreenshotButton {
  width: 100%;
}

@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .stage {
    min-height: 54vh;
    max-height: 68vh;
  }

  .control-panel {
    max-height: none;
  }
}

@media (max-width: 560px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .runtime-status {
    white-space: normal;
  }

  .color-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}