/* ═══════════════════════════════════════════════════════════════
   sm-mathkeyboard.css — SenseMake.uk Shared Framework
   Bottom sheet on-screen keyboard for maths text (prefix: sm-mk-)
   ═══════════════════════════════════════════════════════════════ */

.sm-mk-panel {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 720;
  display: none;
  flex-direction: column;
  background: var(--sm-surface-raised);
  border-top: 1px solid var(--sm-border);
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.12);
  padding-bottom: max(8px, env(safe-area-inset-bottom, 0px));
  max-height: 42vh;
  flex-direction: column;
  font-family: var(--sm-font);
}

[data-theme="dark"] .sm-mk-panel {
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.45);
}

body.sm-mk-panel-open .sm-app-canvas {
  padding-bottom: min(42vh, 280px);
}

.sm-mk-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px 4px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--sm-border);
}

.sm-mk-tab {
  min-height: var(--sm-touch-min, 44px);
  min-width: 72px;
  padding: 0 12px;
  border: 1px solid var(--sm-border);
  border-radius: 6px;
  background: var(--sm-surface);
  color: var(--sm-text);
  font-family: var(--sm-font);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.sm-mk-tab-active {
  border-color: var(--sm-indigo);
  background: var(--sm-indigo-light);
  color: var(--sm-indigo);
}

.sm-mk-close {
  margin-left: auto;
  min-width: var(--sm-touch-min, 44px);
  min-height: var(--sm-touch-min, 44px);
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--sm-text-muted);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
}

.sm-mk-close:hover {
  background: var(--sm-bg);
  color: var(--sm-text);
}

.sm-mk-keys {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding: 6px 8px 10px;
  flex: 1;
  min-height: 0;
}

.sm-mk-row {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 6px;
}

.sm-mk-row:last-child {
  margin-bottom: 0;
}

.sm-mk-key {
  flex: 1 0 auto;
  min-width: var(--sm-touch-min, 44px);
  min-height: var(--sm-touch-min, 44px);
  max-width: 64px;
  padding: 0 4px;
  border: 1px solid var(--sm-border);
  border-radius: 6px;
  background: var(--sm-surface);
  color: var(--sm-text);
  font-family: var(--sm-font-mono, ui-monospace, monospace);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  box-sizing: border-box;
}

.sm-mk-key:active {
  background: var(--sm-indigo-light);
  border-color: var(--sm-indigo);
}

.sm-mk-key:focus-visible {
  outline: 2px solid var(--sm-indigo);
  outline-offset: 2px;
}

.sm-mk-key-inner {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
}

.sm-mk-key-inner .katex {
  font-size: 0.95em;
}

@media (max-width: 480px) {
  .sm-mk-key {
    min-width: 40px;
    max-width: none;
    font-size: 14px;
  }
}