:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --border: #dde1e7;
  --text: #16191f;
  --muted: #5f6b7a;
  --accent: #04455b;
  --accent-text: #ffffff;
  --selected: #e6f4f4;
  --warn: #9a5b00;
  --warn-bg: #fff4e0;
  --error: #b42318;
  --drawer-height: 260px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418;
    --panel: #1b1e24;
    --border: #2d323b;
    --text: #e8eaee;
    --muted: #98a2b3;
    --accent: #86ebe9;
    --accent-text: #04232e;
    --selected: #1d3a40;
    --warn: #ffc56b;
    --warn-bg: #3a2c12;
    --error: #ff8a80;
  }
}

* {
  box-sizing: border-box;
}

/* Component display rules (e.g. .drawer { display: flex }) must not defeat the hidden attribute. */
[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

button,
select,
input,
textarea,
.button {
  font: inherit;
  color: inherit;
}

button,
.button {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
}

button:disabled {
  opacity: 0.45;
  cursor: default;
}

button.primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

select,
input[type="text"] {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 6px;
  padding: 4px 6px;
  min-width: 0;
}

code {
  font-family: 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.brand-title {
  font-weight: 700;
  margin-right: 8px;
}

.inline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}

.status {
  margin-left: auto;
  color: var(--muted);
}

.status.dirty {
  color: var(--warn);
}

.workspace {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 320px;
  min-height: 0;
}

.slide-list-panel,
.inspector {
  background: var(--panel);
  overflow: auto;
  min-height: 0;
}

.slide-list-panel {
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.inspector {
  border-left: 1px solid var(--border);
  padding: 12px;
}

.inspector h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 8px;
}

.inspector label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
  font-weight: 600;
}

.inspector label .req {
  color: var(--error);
}

.inspector textarea {
  min-height: 90px;
  resize: vertical;
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 6px;
  padding: 6px;
  font-family: 'SF Mono', Menlo, Consolas, monospace;
  font-size: 12px;
}

.inspector .open-drawer {
  align-self: flex-start;
  font-weight: 400;
  font-size: 12px;
}

.help {
  color: var(--muted);
  font-size: 12px;
  margin: 0 0 12px;
}

.slide-list {
  list-style: none;
  margin: 0;
  padding: 8px;
  flex: 1;
}

.slide-list li {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 2px 6px;
  padding: 6px;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid transparent;
}

.slide-list li.selected {
  background: var(--selected);
  border-color: var(--accent);
}

.slide-list .num {
  color: var(--muted);
  grid-row: span 2;
}

.slide-list .title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.slide-list .meta {
  font-size: 12px;
  color: var(--muted);
}

.slide-list .meta .flag {
  color: var(--warn);
}

.slide-list .actions {
  grid-column: 2;
  display: none;
  gap: 4px;
}

.slide-list li.selected .actions {
  display: flex;
}

.slide-list .actions button {
  padding: 1px 6px;
  font-size: 12px;
}

.add-slide {
  display: flex;
  gap: 6px;
  padding: 8px;
  border-top: 1px solid var(--border);
}

.add-slide select {
  flex: 1;
}

.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 16px;
  overflow: auto;
  min-height: 0;
}

.welcome {
  max-width: 520px;
  margin-top: 8vh;
}

.welcome h1 {
  margin-top: 0;
}

.preview-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--panel);
  border: 1px solid var(--border);
  overflow: hidden;
  flex: none;
}

.preview-frame iframe {
  position: absolute;
  top: 0;
  left: 0;
  border: 0;
  transform-origin: 0 0;
}

.warnings {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
}

.warnings li {
  background: var(--warn-bg);
  color: var(--warn);
  border-radius: 6px;
  padding: 6px 10px;
  margin-bottom: 6px;
}

.warnings li.error {
  color: var(--error);
}

.drawer {
  height: var(--drawer-height);
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-top: 1px solid var(--border);
}

.drawer-handle {
  height: 6px;
  cursor: ns-resize;
  flex: none;
}

.drawer-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 12px 6px;
}

.drawer-bar .help {
  margin: 0 0 0 auto;
}

.drawer-tabs {
  display: flex;
  gap: 4px;
}

.drawer-tabs button[aria-selected="true"] {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.drawer textarea {
  flex: 1;
  margin: 0 12px;
  resize: none;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 6px;
  padding: 10px;
  font: 14px/1.5 'SF Mono', Menlo, Consolas, monospace;
  tab-size: 2;
}

.error {
  color: var(--error);
  margin: 4px 12px 8px;
  min-height: 1em;
  font-size: 12px;
}

.drawer-toggle {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 2;
}

body.drawer-open .drawer-toggle {
  display: none;
}

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

  .slide-list-panel,
  .inspector {
    border: 0;
    border-bottom: 1px solid var(--border);
    max-height: 40vh;
  }
}