/* Page shell: base rules, app frame, toolbar, formula bar, tabs, dialog. */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  /* The grid and the article scroll inside the workbench. The page itself never scrolls,
     so scrollIntoView on a cell cannot push the menu bar off screen. */
  overflow: hidden;
}

body {
  min-width: 20rem;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-variant-ligatures: none;
  line-height: 1.5;
}

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

button {
  cursor: pointer;
}

button:disabled,
input:disabled {
  cursor: not-allowed;
}

a {
  color: inherit;
  text-underline-offset: 0.25em;
}

a:hover,
a:focus-visible {
  color: var(--accent);
}

:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 1px;
}

::selection {
  color: var(--paper);
  background: var(--accent);
}

[hidden] {
  display: none !important;
}

.app {
  display: grid;
  /* minmax(0, 1fr) stops the wide toolbar and tab strip from stretching the page. */
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto auto auto minmax(0, 1fr) auto;
  height: 100dvh;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom)
    env(safe-area-inset-left);
}

/* ---- toolbar ---- */

.toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  min-height: var(--bar-height);
  padding: var(--space-1) var(--space-3);
  border-bottom: var(--rule);
  overflow-x: auto;
  scrollbar-width: none;
}

.tool {
  flex: none;
  min-width: 1.9rem;
  height: 1.9rem;
  padding: 0 var(--space-2);
  border: 1px solid transparent;
  background: none;
  color: var(--ink);
}

.tool:hover:not(:disabled) {
  background: var(--paper-raised);
  border-color: var(--line);
}

.tool:disabled {
  color: var(--line-bright);
}

.tool[aria-pressed="true"] {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: var(--accent);
}

.tool-bold {
  font-weight: 600;
}

.tool-italic {
  font-style: italic;
}

.tool-underline {
  text-decoration: underline;
}

.tool-strike {
  text-decoration: line-through;
}

.tool-divider {
  flex: none;
  width: 0;
  height: 1.25rem;
  margin: 0 var(--space-1);
  border-left: var(--rule-bright);
}

.swatch {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.swatch input {
  width: 1.1rem;
  height: 1.1rem;
  padding: 0;
  border: 1px solid var(--line-bright);
  background: none;
  cursor: pointer;
}

.swatch input::-webkit-color-swatch-wrapper {
  padding: 0;
}

/* Two rules on purpose. One unknown pseudo-element would void a grouped selector. */
.swatch input::-webkit-color-swatch {
  border: 0;
}

.swatch input::-moz-color-swatch {
  border: 0;
}

.swatch:has(input:disabled) {
  color: var(--line-bright);
  cursor: not-allowed;
}

/* ---- formula bar ---- */

.formulabar {
  display: flex;
  align-items: center;
  min-height: var(--bar-height);
  border-bottom: var(--rule);
}

.name-box,
.formula-input {
  height: var(--bar-height);
  border: 0;
  background: none;
  outline-offset: -1px;
}

.name-box {
  flex: none;
  width: 4.5rem;
  padding: 0 var(--space-3);
  border-right: var(--rule);
  color: var(--muted);
  text-align: center;
}

.fx {
  flex: none;
  padding: 0 var(--space-3);
  color: var(--line-bright);
  font-style: italic;
  font-weight: 600;
  user-select: none;
}

.formula-input {
  flex: 1;
  min-width: 0;
  padding: 0 var(--space-2);
  color: var(--ink-strong);
}

.formula-input:read-only {
  color: var(--muted);
}

.formula-input::placeholder {
  color: var(--line-bright);
}

/* ---- workbench: the frame around the grid, with "+" corner marks ---- */

.workbench {
  position: relative;
  min-height: 0;
  margin: var(--space-3);
  border: var(--rule-bright);
}

.workbench::before,
.workbench::after {
  content: "+";
  position: absolute;
  z-index: 40;
  color: var(--line-bright);
  background: var(--paper);
  line-height: 1;
  pointer-events: none;
}

.workbench::before {
  top: -0.55em;
  left: -0.35em;
}

.workbench::after {
  right: -0.35em;
  bottom: -0.55em;
}

.grid-scroll,
.article {
  width: 100%;
  height: 100%;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.grid-scroll:focus-visible {
  outline: 0;
}

/* ---- sheet tabs ---- */

.tabs {
  display: flex;
  align-items: stretch;
  min-height: var(--bar-height);
  border-top: var(--rule);
  background: var(--paper-raised);
}

.tab-add {
  flex: none;
  width: var(--bar-height);
  border: 0;
  border-right: var(--rule);
  background: none;
  color: var(--muted);
  font-size: var(--text-md);
}

.tab-add:hover {
  color: var(--accent);
}

.tab-list {
  display: flex;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.tab-group {
  display: flex;
  flex: none;
  border-right: var(--rule);
}

.tab {
  flex: none;
  padding: 0 var(--space-4);
  border: 0;
  border-top: 2px solid transparent;
  border-right: var(--rule);
  background: none;
  color: var(--muted);
  white-space: nowrap;
  outline-offset: -2px;
}

.tab-group .tab {
  border-right: 0;
  padding-right: var(--space-2);
}

.tab:hover {
  color: var(--ink-strong);
}

.tab[aria-selected="true"] {
  border-top-color: var(--accent);
  background: var(--paper);
  color: var(--ink-strong);
  font-weight: 600;
}

.tab-group:has([aria-selected="true"]) {
  background: var(--paper);
}

.tab-remove {
  padding: 0 var(--space-3) 0 var(--space-1);
  border: 0;
  border-top: 2px solid transparent;
  background: none;
  color: var(--line-bright);
  outline-offset: -2px;
}

.tab-group:has([aria-selected="true"]) .tab-remove {
  border-top-color: var(--accent);
}

.tab-remove:hover {
  color: var(--danger);
}

/* ---- dialog ---- */

dialog {
  width: min(100% - 2rem, 30rem);
  padding: 0;
  border: var(--rule-bright);
  color: var(--ink);
  background: var(--paper);
}

dialog::backdrop {
  background: rgb(17 18 15 / 35%);
}

.dialog-form {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-6);
}

.dialog-form h2 {
  margin: 0;
  color: var(--accent);
  font-size: var(--text-md);
  font-weight: 600;
}

.dialog-form p,
.dialog-form pre {
  margin: 0;
}

.dialog-form pre {
  padding: var(--space-3);
  border: var(--rule);
  background: var(--paper-raised);
  overflow-x: auto;
}

.dialog-form label {
  display: grid;
  gap: var(--space-2);
  color: var(--muted);
}

.dialog-form input {
  padding: var(--space-2);
  border: 1px solid var(--line-bright);
  background: var(--paper);
  color: var(--ink-strong);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}

.dialog-actions button {
  padding: var(--space-1) var(--space-4);
  border: 1px solid var(--line-bright);
  background: var(--paper);
}

.dialog-actions button:hover {
  background: var(--paper-raised);
}

.dialog-actions .primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--paper);
}

.dialog-actions .primary:hover {
  background: var(--ink-strong);
  border-color: var(--ink-strong);
}

.dialog-actions .danger {
  border-color: var(--danger);
  background: var(--danger);
}

.shortcuts {
  width: 100%;
  border-collapse: collapse;
}

.shortcuts th,
.shortcuts td {
  padding: var(--space-1) 0;
  border-bottom: var(--rule);
  text-align: left;
  font-weight: 400;
  vertical-align: top;
}

.shortcuts th {
  width: 45%;
  padding-right: var(--space-3);
  color: var(--ink-strong);
}

.noscript {
  position: fixed;
  inset: 0;
  z-index: 100;
  padding: var(--space-8);
  background: var(--paper);
}

@media (max-width: 40rem) {
  .workbench {
    margin: var(--space-2);
  }

  /* Every tool is disabled on a locked sheet. On a phone that row is wasted space. */
  .app[data-editable="false"] .toolbar {
    display: none;
  }

  .name-box {
    width: 3.5rem;
    padding: 0 var(--space-1);
  }

  .tab {
    padding: 0 var(--space-3);
  }

  .article-page {
    padding-top: var(--space-4);
  }
}

@media (pointer: coarse) {
  /* iOS zooms the page when a focused input has text under 16px. */
  input,
  select {
    font-size: 16px;
  }

  .tool {
    min-width: 2.5rem;
    height: 2.5rem;
  }

  .tab-remove {
    padding: 0 var(--space-4) 0 var(--space-2);
  }
}