html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  background: var(--app-bg);
  color: var(--chrome-text);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}

.app-shell {
  display: grid;
  grid-template-rows: 62px minmax(0, 1fr);
  height: 100vh;
}

.topbar {
  position: relative;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 18px;
  background: #fcfcfb;
  border-bottom: 1px solid var(--chrome-border);
  box-shadow: var(--shadow-sm);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 142px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  color: #f7f5ed;
  background: var(--chrome-primary);
  border-radius: 9px 3px 9px 3px;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: 20px;
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / 25%);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: 18px;
  letter-spacing: 0.08em;
}

.brand small {
  margin-top: 1px;
  color: var(--chrome-muted);
  font-size: 8px;
  letter-spacing: 0.16em;
}

.project-name-field {
  flex: 0 1 260px;
}

.project-name-field input {
  width: 100%;
  padding: 8px 10px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 600;
}

.project-name-field input:hover,
.project-name-field input:focus {
  background: #fff;
  border-color: var(--chrome-border);
  outline: none;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  white-space: nowrap;
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  margin: 0 3px;
  background: var(--chrome-border);
}

.workspace {
  display: grid;
  grid-template-columns: 320px minmax(420px, 1fr) 280px;
  min-height: 0;
}

.panel {
  position: relative;
  z-index: 5;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--panel-bg);
}

.left-panel {
  border-right: 1px solid var(--chrome-border);
}

.right-panel {
  border-left: 1px solid var(--chrome-border);
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 16px 18px 12px;
}

.panel-heading h1,
.panel-heading h2 {
  margin-top: 2px;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: 18px;
  font-weight: 700;
}

.eyebrow {
  color: var(--chrome-muted);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.panel-scroll {
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: #bec4c5 transparent;
}

.preview-workspace {
  display: grid;
  grid-template-rows: 46px minmax(0, 1fr);
  min-width: 0;
  min-height: 0;
  background:
    linear-gradient(90deg, rgb(255 255 255 / 32%) 1px, transparent 1px),
    linear-gradient(rgb(255 255 255 / 32%) 1px, transparent 1px),
    #e5e8e8;
  background-size: 24px 24px;
}

.preview-bar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 15px;
  color: #5d666b;
  background: rgb(245 246 245 / 92%);
  border-bottom: 1px solid var(--chrome-border);
  font-size: 12px;
  backdrop-filter: blur(8px);
}

.preview-bar > div {
  display: flex;
  align-items: center;
  gap: 8px;
}

.preview-bar strong {
  color: #899196;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.04em;
}

.preview-dot {
  width: 7px;
  height: 7px;
  background: #4d7a6c;
  border-radius: 999px;
  box-shadow: 0 0 0 3px rgb(77 122 108 / 13%);
}

.canvas-viewport {
  min-width: 0;
  min-height: 0;
  padding: 42px 50px 100px;
  overflow: auto;
}

.canvas-stage {
  width: max-content;
  min-width: 100%;
  margin: 0 auto;
  transform-origin: top center;
  transition: transform 180ms ease;
}

.timeline-canvas {
  position: relative;
  width: 800px;
  container-name: timeline-canvas;
  container-type: inline-size;
  margin: 0 auto;
  overflow: hidden;
  color: var(--text-color);
  background: var(--canvas-background);
  border: 1px solid var(--border-color);
  border-radius: var(--canvas-radius);
  box-shadow: var(--shadow-lg);
  font-family: var(--body-font);
  font-size: var(--base-font-size);
  font-weight: var(--body-font-weight);
}

.timeline-canvas.canvas-border-off {
  border-color: transparent;
}

.canvas-section {
  position: relative;
  padding: var(--canvas-padding);
}

.canvas-section[hidden] {
  display: none;
}

.app-shell.is-preview-mode {
  grid-template-rows: 0 minmax(0, 1fr);
}

.app-shell.is-preview-mode .topbar,
.app-shell.is-preview-mode .left-panel,
.app-shell.is-preview-mode .right-panel {
  display: none;
}

.app-shell.is-preview-mode .workspace {
  grid-template-columns: minmax(0, 1fr);
}

.app-shell.is-preview-mode .preview-workspace {
  grid-column: 1;
}

.app-shell.is-preview-mode .preview-bar {
  justify-content: center;
}

.app-shell.is-preview-mode .preview-bar > :first-child {
  display: none;
}

button.exit-preview {
  position: fixed;
  top: 16px;
  right: 18px;
  z-index: 60;
  display: none;
  box-shadow: 0 10px 28px rgb(21 38 33 / 22%);
}

body:has(.app-shell.is-preview-mode) button.exit-preview {
  display: inline-flex;
}