:root {
  --bg: #edf3fb;
  --panel: rgba(255, 255, 255, 0.96);
  --panel-border: rgba(20, 34, 54, 0.1);
  --text: #112033;
  --muted: #607086;
  --accent: #1769ff;
  --accent-strong: #0f4fcb;
  --stage-bg: #f8fbff;
  --shadow: 0 18px 40px rgba(17, 32, 51, 0.12);
  --radius: 22px;
  --tool-radius: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(109, 173, 255, 0.26), transparent 28%),
    linear-gradient(180deg, #f9fbff 0%, var(--bg) 100%);
  color: var(--text);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  overscroll-behavior: none;
}

body {
  min-height: 100vh;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 10px;
  padding: calc(env(safe-area-inset-top, 0px) + 8px) 10px calc(env(safe-area-inset-bottom, 0px) + 10px);
}

.toolbar-shell {
  position: sticky;
  top: 0;
  z-index: 30;
  pointer-events: auto;
}

.toolbar {
  display: grid;
  gap: 10px;
  padding: 10px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  box-shadow: 0 10px 24px rgba(17, 32, 51, 0.08);
  backdrop-filter: blur(14px);
}

.toolbar-main {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.edit-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.edit-panel[hidden] {
  display: none;
}

.tool {
  min-height: 46px;
  border: 1px solid rgba(20, 34, 54, 0.12);
  border-radius: var(--tool-radius);
  background: #fff;
  color: var(--text);
  padding: 0 12px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  touch-action: manipulation;
  pointer-events: auto;
}

button.tool {
  cursor: pointer;
}

.tool.is-active,
#editButton[aria-expanded="true"] {
  background: rgba(23, 105, 255, 0.12);
  border-color: rgba(23, 105, 255, 0.28);
  color: var(--accent-strong);
}

.tool-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.file-button {
  position: relative;
  overflow: hidden;
}

.file-button input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.color-tool,
.size-tool {
  gap: 8px;
}

.color-tool input[type="color"] {
  inline-size: 34px;
  block-size: 34px;
  border: 0;
  padding: 0;
  background: transparent;
}

.size-tool input[type="range"] {
  inline-size: 76px;
  min-width: 0;
  accent-color: var(--accent);
}

.size-value {
  min-width: 1.4em;
  text-align: center;
  color: var(--accent-strong);
}

.workspace {
  min-height: 0;
  display: flex;
}

.stage {
  position: relative;
  width: 100%;
  min-height: 320px;
  flex: 1;
  overflow: hidden;
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(241, 247, 255, 0.98)),
    var(--stage-bg);
  border: 1px solid rgba(20, 34, 54, 0.08);
  box-shadow: var(--shadow);
  z-index: 1;
}

.viewport {
  position: absolute;
  inset: 0;
  overflow: hidden;
  touch-action: auto;
}

.media-layer {
  position: absolute;
  inset: 0;
  margin: auto;
  display: none;
  transform-origin: center center;
  will-change: transform;
}

.base-image,
#drawCanvas {
  position: absolute;
  inset: 0;
  margin: auto;
  max-width: 100%;
  max-height: 100%;
}

.base-image {
  display: none;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

#drawCanvas {
  display: none;
  touch-action: none;
  pointer-events: auto;
}

.stage.has-image .media-layer,
.stage.has-image #baseImage,
.stage.has-image #drawCanvas {
  display: block;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 1rem;
}

.stage.has-image .empty-state {
  display: none;
}

.message {
  min-height: 1.4em;
  margin: 0;
  padding: 0 6px;
  text-align: center;
  color: var(--muted);
  font-size: 0.93rem;
}

.status {
  min-height: 1.2em;
  margin: 0;
  padding: 0 6px;
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
}

body.is-drawing {
  overscroll-behavior: none;
}

@media (max-width: 520px) {
  .edit-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .size-tool {
    grid-column: span 2;
  }
}

@media (min-width: 700px) {
  .app-shell {
    padding-left: 18px;
    padding-right: 18px;
    gap: 14px;
  }

  .edit-panel {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .tool {
    min-height: 48px;
  }
}