/* Base tokens, app header, main area, and buttons. */
/* rastertrace: compact desktop-tool UI shared with the image app family.
   Neutral dark ramp, one orange accent, one radius scale. */
:root {
  --fs-xs: 11px;
  --fs-sm: 12px;
  --fs-md: 13px;
  --fs-lg: 18px;
  --bg: #111419;
  --surface-1: #181c22;
  --surface-2: #20252c;
  --surface-3: #282e37;
  --surface-hover: #313946;
  --border: #343c47;
  --border-strong: #4f5b69;
  /* 3:1 against every surface up to --surface-3 (WCAG 1.4.11). */
  --border-input: #6e7c8d;
  --border-hairline: #0d1013;
  --text: #e9ecef;
  --text-dim: #c7cdd5;
  --text-faint: #98a3b0;
  --accent: #ff9a00;
  --accent-hover: #ffb13b;
  --accent-press: #d97706;
  --accent-soft: rgb(255 154 0 / 18%);
  --accent-ink: #181109;
  --error: #f0766b;
  --success: #62c598;
  --r-xs: 4px;
  --r-sm: 6px;
  --r: 8px;
  --r-lg: 12px;
  --shadow-1: 0 1px 2px rgb(0 0 0 / 24%);
  --shadow-2: 0 4px 16px rgb(0 0 0 / 40%);
  --shadow-3: 0 16px 48px rgb(0 0 0 / 50%);
  --disabled-opacity: 0.4;
  --check-a: #303741;
  --check-b: #242a32;
  --ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
  --font-ui:
    ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  /* Side inset shared by every rail section, so content lines up. */
  --rail-pad: 16px;
  /* Rail controls; header and toolbar controls. Coarse pointers raise
     both to 44px below. */
  --control-h: 32px;
  --control-h-sm: 28px;
  font-family: var(--font-ui);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

/* hidden must beat any class display value */
[hidden] {
  display: none !important;
}

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

/* Double-tap zoom on iOS turns quick taps on buttons into page zooms.
   manipulation drops it but keeps pinch zoom and scrolling. */
html {
  touch-action: manipulation;
}

body {
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  overflow: hidden;
}

/* Hidden from view but kept in layout, so iOS Safari allows a programmatic
   click() on the file input (it blocks click on display:none inputs). */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  /* Transparent until forced colors repaint it: box-shadow is dropped there. */
  outline: 2px solid transparent;
  outline-offset: 2px;
  box-shadow: var(--ring);
}

/* Short state transitions so hover and pressed changes do not snap. */
:where(button, summary, select, input) {
  transition:
    background-color 120ms ease-out,
    border-color 120ms ease-out,
    color 120ms ease-out,
    box-shadow 120ms ease-out;
}
@media (prefers-reduced-motion: reduce) {
  :where(button, summary, select, input) {
    transition: none;
  }
}

/* ---------- App header and menus ---------- */
.app-header {
  position: relative;
  z-index: 20;
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr) max-content;
  flex: 0 0 50px;
  min-width: 0;
  align-items: center;
  gap: 16px;
  padding: 0 12px;
  background: var(--surface-1);
  border-bottom: 1px solid var(--border-hairline);
  box-shadow: inset 0 -1px rgb(255 255 255 / 5%);
}

.menubar,
.topbar-actions,
.export-actions {
  display: flex;
  min-width: 0;
  align-items: center;
}
.menubar {
  height: 100%;
  gap: 2px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  margin: 0 8px 0 0;
  color: var(--text);
  font-size: var(--fs-md);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand-mark {
  display: block;
  width: 22px;
  height: 22px;
  flex: none;
}
.app-menu {
  position: relative;
  height: 100%;
}
.app-menu summary {
  display: flex;
  height: 100%;
  align-items: center;
  padding: 0 8px;
  border-radius: var(--r);
  color: var(--text-dim);
  font: var(--fs-md)/1.4 var(--font-ui);
  list-style: none;
  user-select: none;
  cursor: pointer;
}
.app-menu summary::-webkit-details-marker {
  display: none;
}
.app-menu summary:hover,
.app-menu[open] summary {
  background: var(--surface-hover);
  color: var(--text);
}
.menu-popover {
  position: absolute;
  top: calc(100% - 4px);
  left: 0;
  display: grid;
  width: max-content;
  max-width: calc(100vw - 16px);
  padding: 4px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r);
  background: var(--surface-3);
  box-shadow: var(--shadow-3);
  font: var(--fs-md)/1.4 var(--font-ui);
  /* Above later header siblings: disabled tools' opacity creates stacking
     contexts that otherwise paint over the popover when the toolbar wraps
     under the menu bar on narrow screens. */
  z-index: 2;
}
.menu-popover button,
.menu-popover > a {
  display: flex;
  width: 100%;
  min-height: 30px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 4px 8px;
  border: 0;
  border-radius: var(--r-xs);
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
}
.menu-popover button:hover,
.menu-popover > a:hover {
  background: var(--surface-hover);
  color: var(--text);
}
.menu-popover button span {
  min-width: 38px;
  color: var(--text-faint);
  font-size: var(--fs-xs);
  text-align: right;
}
.menu-popover button:hover span {
  color: var(--text-dim);
}
.menu-popover button:disabled {
  opacity: var(--disabled-opacity);
  cursor: default;
}
.menu-popover button:disabled:hover {
  background: transparent;
  color: inherit;
}
.menu-popover hr {
  width: 100%;
  margin: 4px 0;
  border: 0;
  border-top: 1px solid var(--border);
}
.header-tool {
  display: grid;
  min-width: 30px;
  height: var(--control-h-sm);
  place-items: center;
  padding: 0 8px;
  border: 0;
  border-right: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-dim);
  font: 500 var(--fs-md)/1 var(--font-ui);
  cursor: pointer;
}
.header-tool:last-child {
  border-right: 0;
}
.header-tool:hover {
  background: var(--surface-hover);
  color: var(--text);
}
.header-tool:active {
  background: var(--surface-1);
}
.header-tool:disabled {
  opacity: var(--disabled-opacity);
  cursor: default;
}
.header-tool:disabled:hover {
  background: var(--surface-2);
  color: var(--text-dim);
}
.header-tool.zoom-level {
  min-width: 52px;
  color: var(--text);
  font-size: var(--fs-xs);
  font-variant-numeric: tabular-nums;
}
.topbar-actions {
  gap: 4px;
  justify-self: end;
  margin-left: auto;
}
.export-actions {
  gap: 4px;
}
.action-divider {
  width: 1px;
  height: 20px;
  margin: 0 2px;
  background: var(--border);
}
.header-action,
.primary-action {
  display: inline-flex;
  height: var(--control-h-sm);
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 8px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--surface-2);
  color: var(--text-dim);
  font: inherit;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
}
.header-action:hover {
  border-color: var(--border-strong);
  background: var(--surface-hover);
  color: var(--text);
}
.header-action:active,
.primary-action:active {
  transform: translateY(1px);
}
.header-action:disabled {
  opacity: var(--disabled-opacity);
  cursor: default;
}
.primary-action {
  padding-inline: 10px;
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}
.primary-action:hover {
  border-color: var(--accent-hover);
  background: var(--accent-hover);
}
.primary-action:disabled {
  opacity: var(--disabled-opacity);
  cursor: default;
}

/* ---------- Main ---------- */
main {
  flex: 1;
  width: 100%;
  min-width: 0;
  min-height: 0;
}

/* ---------- Empty state ---------- */
/* Center the drop zone in the whole window, not the top 55%. */
main:has(> #empty-state:not([hidden])) {
  display: grid;
}
.stage-empty {
  display: grid;
  min-height: 55vh;
  place-items: center;
  padding: 20px 16px;
}

.dropzone {
  display: grid;
  justify-items: center;
  gap: 12px;
  width: min(560px, 100%);
  padding: 40px 24px;
  border: 2px dashed var(--border-strong);
  border-radius: var(--r);
  background: var(--surface-1);
  text-align: center;
}

.dropzone {
  cursor: pointer;
}
.tap-copy {
  display: none;
}

.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.dropzone-mark {
  display: block;
  width: 52px;
  height: 52px;
}
.dropzone-title {
  margin: 0;
  font-size: var(--fs-lg);
  font-weight: 600;
}
.dropzone-hint {
  margin: 0;
  color: var(--text-dim);
  max-width: 40ch;
}

/* ---------- Buttons ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--control-h);
  padding: 0 12px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
}

.button-primary {
  background: var(--accent);
  color: var(--accent-ink);
}
.button-primary:hover {
  background: var(--accent-hover);
}
.button-primary:active {
  background: var(--accent-press);
}

.button-secondary {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border-strong);
}
.button-secondary:hover {
  border-color: var(--text-faint);
}

.button[disabled],
.button[aria-disabled="true"] {
  opacity: var(--disabled-opacity);
  pointer-events: none;
}