/* Small screen and touch device rules. */

/* ---------- Small screens ---------- */
@media (max-width: 1180px) {
  .brand > span:last-child {
    display: none;
  }
  .topbar-actions {
    gap: 4px;
  }
  .export-actions {
    gap: 4px;
  }
  .header-action,
  .primary-action {
    padding-inline: 6px;
    font-size: var(--fs-sm);
  }
  .topbar-actions > .header-action span:not(.icon) {
    font-size: 0;
  }
  .topbar-actions > .header-action span:not(.icon)::after {
    content: "Open";
    font-size: var(--fs-sm);
  }
  .save-action span:not(.icon) {
    font-size: 0;
  }
  .save-action span:not(.icon)::after {
    content: "SVG";
    font-size: var(--fs-sm);
  }
  #download-pdf,
  #download-dxf {
    display: none;
  }
}

@media (max-width: 900px) {
  body {
    overflow: auto;
  }
  .app-header {
    gap: 4px;
    padding-inline: 8px;
  }
  .trace-stats {
    display: none;
  }
  /* Panels stack under the preview here, so there is nothing to fold. */
  .rail-fold {
    display: none;
  }
  /* Status and zoom stay on screen while the settings scroll (WCAG 4.1.3:
     a hidden live region is never announced). */
  html {
    scroll-padding-bottom: 56px;
  }
  .statusbar {
    position: sticky;
    bottom: 0;
    z-index: 5;
    flex-basis: auto;
    min-height: 44px;
    gap: 10px;
  }
  .statusbar .repo-link svg {
    display: none;
  }
  .statusbar .status-zoom {
    height: 34px;
  }
  .statusbar .status-zoom .header-tool {
    height: 32px;
    min-width: 40px;
    font-size: var(--fs-md);
  }
  .statusbar .status-zoom .zoom-level {
    min-width: 52px;
  }
  .app-menu summary {
    padding-inline: 8px;
  }

  main {
    padding: 16px 12px;
  }

  .workspace {
    grid-template-columns: 1fr;
    grid-template-areas: "canvas" "left" "right";
    height: auto;
    min-height: 0;
    gap: 20px;
  }

  /* Task order on mobile: result first, tweak below, guide last */
  .preview-pane {
    order: 1;
    min-height: 420px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: var(--r);
  }
  .controls {
    order: 2;
    overflow-y: visible;
    border: 1px solid var(--border);
    border-radius: var(--r);
    overflow: hidden;
  }
  .controls-right {
    order: 3;
  }

  .preview {
    height: 55dvh;
    min-height: 220px;
    max-height: none;
  }
  /* The preview pane runs under the sticky status bar, further still when
     the wand's sliders add toolbar rows, so pin the selection buttons to
     the viewport just above the bar. */
  .selection-actions {
    position: fixed;
    bottom: 60px;
    z-index: 6;
  }
  /* A fitted preview has nothing to pan: let one finger scroll the page
     past it. Two-finger pinches still reach view.js. */
  .preview.fitted:not(.erasing, .blob-filling, .blob-picking, .smoothing, .selecting) {
    touch-action: pan-y;
  }
}

@media (max-width: 680px) {
  /* The tool rail floats over the preview, folded to the chosen tool, the
     tray toggle, undo and redo; the toggle opens a tray of every tool. */
  .preview-pane > .preview {
    grid-column: 1 / -1;
  }
  .tool-rail {
    z-index: 5;
    align-self: start;
    justify-self: start;
    margin: 8px;
    padding: 4px;
    gap: 4px;
    overflow: visible;
    background: rgb(24 28 34 / 94%);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-2);
  }
  .rail-tool {
    width: 44px;
    height: 44px;
  }
  .tray-toggle {
    display: grid;
  }
  .rail-divider,
  .rail-spacer,
  .tool-rail:not(.open)
    .rail-tool:not(
      .tray-toggle,
      [aria-pressed="true"],
      #eraser-undo,
      #eraser-redo,
      #eraser-clear:enabled
    ) {
    display: none;
  }
  .tool-rail.open {
    display: grid;
    grid-template-columns: repeat(4, 44px);
  }
  .tray-toggle[aria-expanded="true"] {
    border-color: var(--accent);
    color: var(--text);
  }
  /* The active tool's options open in a sheet pinned above the status bar,
     like the selection actions, and above those when they show. */
  body:has(.tool-rail .rail-tool[aria-pressed="true"]:not(#move-tool)) .tool-options {
    position: fixed;
    z-index: 6;
    left: 8px;
    right: 8px;
    bottom: 60px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 12px;
    padding: 10px 12px;
    background: rgb(24 28 34 / 97%);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-2);
  }
  body:has(#selection-actions:not([hidden])) .tool-options {
    bottom: 128px;
  }
  .tool-options > .selection-mode {
    flex: 1 1 100%;
  }
  /* Name and value on one line, the slider full width under them. */
  .tool-options > :is(.wand-option, .eraser-size) {
    flex: 1 1 0;
    flex-wrap: wrap;
    gap: 2px 6px;
  }
  .tool-options > :is(.wand-option, .eraser-size) > span {
    flex: 1 1 auto;
  }
  .tool-options > :is(.wand-option, .eraser-size) input {
    order: 1;
    flex: 1 1 100%;
    width: 100%;
  }
  .tool-options > :is(.wand-option, .eraser-size) output {
    min-width: 0;
  }
  /* Rotate and invert live in the View menu here. */
  .canvas-strip .rotate-group,
  .backdrop-label {
    display: none;
  }
  /* One settings section at a time, picked from tabs under the preview. */
  .sheet-tabs {
    position: sticky;
    top: 0;
    z-index: 4;
    order: 2;
    display: flex;
    gap: 2px;
    margin-inline: -12px;
    padding: 4px 12px;
    overflow-x: auto;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    scrollbar-width: none;
  }
  .sheet-tabs::-webkit-scrollbar {
    display: none;
  }
  .sheet-tabs button {
    flex: none;
    min-height: 44px;
    padding: 0 12px;
    border: 0;
    border-radius: var(--r-sm);
    color: var(--text-faint);
    background: transparent;
    font: inherit;
    font-size: var(--fs-md);
    cursor: pointer;
  }
  .sheet-tabs button[aria-pressed="true"] {
    color: var(--text);
    font-weight: 600;
    box-shadow: inset 0 -2px 0 var(--accent);
  }
  .sheet-tabs button:focus-visible {
    outline: none;
    box-shadow: var(--ring);
  }
  /* Named grid rows would pin the left column above the tabs; flow by order. */
  .workspace {
    grid-template-areas: none;
  }
  .workspace > * {
    grid-area: auto;
  }
  .controls {
    order: 3;
  }
  .controls-right {
    order: 4;
  }
  .rail-head,
  [data-sheet] > summary {
    display: none;
  }
  .workspace:not([data-sheet="presets"]) [data-sheet="presets"],
  .workspace:not([data-sheet="palette"]) [data-sheet="palette"],
  .workspace:not([data-sheet="background"]) [data-sheet="background"],
  .workspace:not([data-sheet="colors"]) [data-sheet="colors"],
  .workspace:not([data-sheet="tracing"]) [data-sheet="tracing"],
  .workspace:not([data-sheet="export"]) [data-sheet="export"] {
    display: none;
  }
  /* Colors spans both columns: the colors panel left, cleanup right. */
  .workspace:not([data-sheet="presets"], [data-sheet="palette"], [data-sheet="colors"])
    .controls-left,
  .workspace[data-sheet="presets"] .controls-right,
  .workspace[data-sheet="palette"] .controls-right {
    display: none;
  }
  .topbar-actions > .header-action,
  .action-divider,
  #download-pdf,
  #download-dxf {
    display: none;
  }
}

@media (max-width: 520px) {
  .brand {
    margin-right: 0;
  }
  .statusbar .repo-link {
    display: none;
  }
  #copy-svg {
    display: none;
  }
}

/* ---------- Touch devices ---------- */
/* 44px targets for coarse pointers (Apple HIG; WCAG 2.5.8's floor is
   24px). Width breakpoints alone gave landscape tablets desktop sizes. */
@media (pointer: coarse) {
  input[type="range"]::-webkit-slider-thumb {
    width: 22px;
    height: 22px;
    margin-top: -9px;
  }
  input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
  }
  .drop-copy {
    display: none;
  }
  .tap-copy {
    display: inline;
  }
  .header-tool,
  .header-action,
  .primary-action,
  .app-menu summary,
  .menu-popover button,
  .menu-popover a,
  .panel > summary,
  details.advanced > summary,
  .button,
  .color-row .button,
  .toggle,
  select {
    min-height: 44px;
  }
  .header-tool,
  .icon-button {
    min-width: 44px;
  }
  .rail-tool {
    width: 44px;
    height: 44px;
  }
  .blob-color input[type="text"] {
    width: 92px;
  }
  /* iOS Safari zooms the page when a focused field's text is under 16px. */
  input[type="text"],
  input[type="number"],
  .blob-color input[type="text"],
  .dialog-form input[type="text"],
  select {
    font-size: 16px;
  }
  .app-header {
    flex-basis: 60px;
  }
  .statusbar {
    flex-basis: 48px;
    min-height: 48px;
  }
  .statusbar .status-zoom {
    height: 46px;
  }
  .statusbar .status-zoom .header-tool {
    height: 44px;
    font-size: 13px;
  }
  .workspace {
    height: calc(100dvh - 108px);
  }
}

/* The page scrolls under 900px, so the touch workspace height above
   must not cap the stacked layout. */
@media (pointer: coarse) and (max-width: 900px) {
  .workspace {
    height: auto;
  }
}