/* ============================================
   Standalone Graphing Calculator page
   Desmos-style: sidebar (left) + big graph (right)
   ============================================ */

.calcpage-body {
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.calcpage-header {
  position: relative;
  top: 0;
  z-index: 20;
  flex: 0 0 auto;
  border-bottom: 1px solid var(--color-border);
}

.calcpage-app {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 380px 1fr;
  min-height: 0;
  background: var(--color-surface);
}

/* --------- Sidebar --------- */
.calcpage-sidebar {
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.calcpage-sidebar.is-hidden {
  display: none;
}

.calcpage-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-offset);
  flex: 0 0 auto;
}

.calcpage-tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}
.calcpage-tab:hover { color: var(--color-text); }
.calcpage-tab.is-active {
  color: var(--color-ink);
  border-bottom-color: var(--color-ink);
  background: var(--color-surface);
}

.calcpage-panel {
  display: none;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 16px;
}
.calcpage-panel.is-active {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* --------- Function rows --------- */
.calcpage-panel-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fn-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease;
}
.fn-row:focus-within {
  border-color: var(--color-ink);
}
.fn-row.is-error {
  border-color: var(--color-warm);
}

.fn-color {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.15s ease;
  flex: 0 0 auto;
}
.fn-color:hover { transform: scale(1.2); }
.fn-color.is-hidden {
  background: transparent !important;
  border-color: var(--color-text-muted);
}

.fn-input {
  font-family: var(--font-mono);
  font-size: 14px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text);
  width: 100%;
}
.fn-input::placeholder { color: var(--color-text-muted); opacity: 0.7; }

.fn-remove {
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  color: var(--color-text-muted);
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}
.fn-remove:hover { color: var(--color-warm); background: var(--color-surface); }

.fn-error {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-warm);
  padding-left: 20px;
  margin-top: 2px;
}

/* Parameter sliders inside a fn-row */
.fn-params {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 4px;
  padding-top: 10px;
  border-top: 1px dashed var(--color-border);
}
.fn-param {
  display: grid;
  grid-template-columns: 20px 1fr 42px;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
}
.fn-param-name {
  color: var(--color-text-muted);
  font-weight: 500;
}
.fn-param input[type="range"] {
  width: 100%;
  accent-color: var(--color-ink);
}
.fn-param-value {
  text-align: right;
  color: var(--color-text);
  font-size: 12px;
}
.fn-param-range {
  display: none;
  grid-column: 2 / -1;
  gap: 6px;
  font-size: 10px;
  color: var(--color-text-muted);
  margin-top: 2px;
}
.fn-param.is-editing .fn-param-range {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.fn-param-range input {
  width: 100%;
  padding: 2px 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-text);
}
.fn-param-edit {
  font-size: 10px;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  text-align: left;
  grid-column: 2;
}
.fn-param-edit:hover { color: var(--color-ink); }

/* --------- Add button --------- */
.calcpage-add-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 10px 12px;
  background: var(--color-ink);
  color: var(--color-surface);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.15s ease;
}
.calcpage-add-btn:hover { background: color-mix(in oklab, var(--color-ink) 88%, black); }

.calcpage-secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  align-self: flex-start;
}
.calcpage-secondary-btn:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

/* --------- Help section --------- */
.calcpage-help {
  margin-top: 8px;
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
}
.calcpage-help summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 4px 0;
  list-style: none;
}
.calcpage-help summary::-webkit-details-marker { display: none; }
.calcpage-help summary::before {
  content: "▸ ";
  font-size: 10px;
  margin-right: 4px;
}
.calcpage-help[open] summary::before { content: "▾ "; }
.calcpage-help summary:hover { color: var(--color-text); }
.calcpage-help-inner {
  padding: 8px 4px;
  font-size: 13px;
}
.calcpage-help-inner p {
  margin: 8px 0 4px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text);
}
.calcpage-help-inner ul {
  margin: 0 0 6px;
  padding-left: 18px;
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.6;
}
.calcpage-help-inner code {
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--color-surface-offset);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--color-text);
}
.calcpage-tries {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}
.preset-chip {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 8px;
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.15s ease;
}
.preset-chip:hover {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

/* --------- Table panel --------- */
.calcpage-table-controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.calcpage-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.calcpage-field > span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.calcpage-field input,
.calcpage-field select {
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  outline: none;
}
.calcpage-field input:focus, .calcpage-field select:focus {
  border-color: var(--color-ink);
}
.calcpage-field-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.calcpage-table-scroll {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
}
.calcpage-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 13px;
}
.calcpage-table thead {
  position: sticky;
  top: 0;
  background: var(--color-surface);
  z-index: 2;
}
.calcpage-table th {
  padding: 8px 12px;
  text-align: left;
  font-weight: 500;
  color: var(--color-text-muted);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--color-border);
}
.calcpage-table td {
  padding: 6px 12px;
  color: var(--color-text);
  border-bottom: 1px dotted var(--color-border);
}
.calcpage-table tbody tr:hover { background: var(--color-surface); }
.calcpage-table td.is-undef {
  color: var(--color-warm);
  font-style: italic;
}

/* --------- Analyze panel --------- */
.calcpage-analyze-controls {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}
.calcpage-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text);
  cursor: pointer;
  user-select: none;
}
.calcpage-checkbox input {
  accent-color: var(--color-ink);
}
.calcpage-analyze-results {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.analyze-group {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  background: var(--color-surface-offset);
}
.analyze-group-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}
.analyze-item {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text);
  padding: 3px 0;
  display: flex;
  align-items: center;
  gap: 6px;
}
.analyze-item::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--dot-color, var(--color-ink));
}
.calcpage-empty {
  color: var(--color-text-muted);
  font-size: 13px;
  font-style: italic;
  text-align: center;
  padding: 24px 8px;
}

/* --------- Graph region --------- */
.calcpage-graph-region {
  /* Override generic section padding from style.css */
  padding: 0;
  max-width: none;
  margin: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--color-bg);
}

.calcpage-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  flex: 0 0 auto;
}
.calcpage-toolbar-group {
  display: flex;
  gap: 4px;
}
.calcpage-toolbar-info {
  flex: 1 1 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
  text-align: center;
}
.calcpage-tool {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}
.calcpage-tool:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
  background: var(--color-surface-offset);
}
.calcpage-tool-open.is-open svg {
  transform: rotate(180deg);
}

.calcpage-graph-mount {
  flex: 1 1 auto;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
  position: relative;
}
.calcpage-graph-mount canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* --------- Responsive --------- */
@media (max-width: 900px) {
  .calcpage-app {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 320px) 1fr;
  }
  .calcpage-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  .calcpage-body {
    /* Allow scrolling on mobile - the fixed viewport is too cramped */
    height: auto;
    min-height: 100vh;
    overflow: auto;
  }
  .calcpage-app {
    height: auto;
    min-height: calc(100vh - 60px);
  }
  .calcpage-sidebar {
    max-height: none;
  }
  .calcpage-graph-mount {
    min-height: 400px;
  }
}

@media (max-width: 900px) {
  .calcpage-tool-open { display: none; }
}