@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --integral-calculator-with-steps-teal: #0D9488;
  --integral-calculator-with-steps-teal-light: #14B8A6;
  --integral-calculator-with-steps-teal-dark: #0F766E;
  --integral-calculator-with-steps-navy: #0F172A;
  --integral-calculator-with-steps-navy-mid: #1E293B;
  --integral-calculator-with-steps-white: #FFFFFF;
  --integral-calculator-with-steps-gray: #F1F5F9;
  --integral-calculator-with-steps-gray-mid: #E2E8F0;
  --integral-calculator-with-steps-text: #0F172A;
  --integral-calculator-with-steps-text-muted: #64748B;
  --integral-calculator-with-steps-red: #DC2626;
  --integral-calculator-with-steps-amber: #D97706;
}

.integral-calculator-with-steps-wrap {
  font-family: 'Inter', sans-serif;
  color: var(--integral-calculator-with-steps-text);
  max-width: 1180px;
  margin: 0 auto;
  box-sizing: border-box;
}

.integral-calculator-with-steps-wrap * {
  box-sizing: border-box;
}

/* Header */
.integral-calculator-with-steps-header-card {
  display: flex;
  align-items: center;
  gap: 18px;
  background: linear-gradient(135deg, var(--integral-calculator-with-steps-navy) 0%, var(--integral-calculator-with-steps-navy-mid) 100%);
  color: var(--integral-calculator-with-steps-white);
  border-radius: 14px;
  padding: 24px 28px;
  margin-bottom: 18px;
}

.integral-calculator-with-steps-header-icon {
  font-size: 34px;
  line-height: 1;
  background: rgba(20, 184, 166, 0.18);
  border: 1px solid rgba(20, 184, 166, 0.4);
  color: var(--integral-calculator-with-steps-teal-light);
  width: 56px;
  height: 56px;
  min-width: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
}

.integral-calculator-with-steps-header-title {
  margin: 0 0 4px 0;
  font-size: 22px;
  font-weight: 800;
}

.integral-calculator-with-steps-header-subtitle {
  margin: 0;
  font-size: 13.5px;
  color: #CBD5E1;
}

/* Toolbar */
.integral-calculator-with-steps-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 10px;
}

.integral-calculator-with-steps-history-toggle-btn {
  background: var(--integral-calculator-with-steps-white);
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  color: var(--integral-calculator-with-steps-teal-dark);
  font-weight: 600;
  font-size: 13.5px;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
}

.integral-calculator-with-steps-history-toggle-btn:hover {
  background: var(--integral-calculator-with-steps-gray);
}

/* History panel */
.integral-calculator-with-steps-history-panel {
  background: var(--integral-calculator-with-steps-gray);
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  border-radius: 12px;
  padding: 18px;
  margin-bottom: 18px;
}

.integral-calculator-with-steps-history-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.integral-calculator-with-steps-history-panel-head h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

.integral-calculator-with-steps-history-panel-actions {
  display: flex;
  gap: 8px;
}

.integral-calculator-with-steps-history-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(0, 1fr));
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.integral-calculator-with-steps-history-item {
  background: var(--integral-calculator-with-steps-white);
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  border-radius: 10px;
  padding: 12px 14px;
  min-width: 0;
}

.integral-calculator-with-steps-history-item-time {
  font-size: 11px;
  color: var(--integral-calculator-with-steps-text-muted);
  margin: 0 0 4px 0;
}

.integral-calculator-with-steps-history-item-fn {
  font-size: 13.5px;
  font-weight: 600;
  margin: 0 0 4px 0;
  word-break: break-word;
}

.integral-calculator-with-steps-history-item-result {
  font-size: 12.5px;
  color: var(--integral-calculator-with-steps-teal-dark);
  margin: 0;
  word-break: break-word;
}

.integral-calculator-with-steps-history-empty {
  color: var(--integral-calculator-with-steps-text-muted);
  font-size: 13.5px;
  padding: 8px 0;
}

/* Main grid - single full-width column: input area on top (including the
   keypad, which needs the room), results panel appears below it once
   calculated, rather than a cramped side-by-side layout. */
.integral-calculator-with-steps-main-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.integral-calculator-with-steps-panel {
  background: var(--integral-calculator-with-steps-white);
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  border-radius: 14px;
  padding: 22px;
  min-width: 0;
}

.integral-calculator-with-steps-inputs-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-self: start;
}

/* Fields */
.integral-calculator-with-steps-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 0 1 auto;
  min-width: 0;
}

.integral-calculator-with-steps-field-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.integral-calculator-with-steps-field-row > .integral-calculator-with-steps-field {
  flex: 1 1 140px;
}

.integral-calculator-with-steps-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--integral-calculator-with-steps-text);
}

.integral-calculator-with-steps-input {
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  padding: 10px 12px;
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  border-radius: 8px;
  color: var(--integral-calculator-with-steps-text);
  min-width: 0;
  width: 100%;
}

.integral-calculator-with-steps-input:focus {
  outline: none;
  border-color: var(--integral-calculator-with-steps-teal);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.integral-calculator-with-steps-mathfield {
  display: block;
  width: 100%;
  min-width: 0;
  font-size: 18px;
  padding: 10px 12px;
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  border-radius: 8px;
  background: var(--integral-calculator-with-steps-white);
  --primary: var(--integral-calculator-with-steps-teal);
  --caret-color: var(--integral-calculator-with-steps-navy);
  --selection-background-color: rgba(13, 148, 136, 0.18);
  --placeholder-color: var(--integral-calculator-with-steps-teal-dark);
  --placeholder-opacity: 0.5;
}

.integral-calculator-with-steps-mathfield:focus-within {
  outline: none;
  border-color: var(--integral-calculator-with-steps-teal);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.integral-calculator-with-steps-hint {
  font-size: 12px;
  color: var(--integral-calculator-with-steps-text-muted);
  margin: 0;
  line-height: 1.5;
}

.integral-calculator-with-steps-hint code {
  background: var(--integral-calculator-with-steps-gray);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 11.5px;
}

.integral-calculator-with-steps-input-mode-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
}

.integral-calculator-with-steps-input-mode-tab {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 12px;
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  background: var(--integral-calculator-with-steps-gray);
  color: var(--integral-calculator-with-steps-text-muted);
  border-radius: 999px;
  cursor: pointer;
}

.integral-calculator-with-steps-input-mode-tab--active {
  background: var(--integral-calculator-with-steps-teal);
  border-color: var(--integral-calculator-with-steps-teal);
  color: var(--integral-calculator-with-steps-white);
}

.integral-calculator-with-steps-radio-row {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 8px 20px;
}

@media (max-width: 640px) {
  .integral-calculator-with-steps-radio-row {
    flex-direction: column;
    gap: 8px;
  }
}

.integral-calculator-with-steps-radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}

.integral-calculator-with-steps-example-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.integral-calculator-with-steps-example-chip {
  background: var(--integral-calculator-with-steps-gray);
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  color: var(--integral-calculator-with-steps-teal-dark);
  font-family: 'Inter', sans-serif;
  font-size: 12.5px;
  font-weight: 600;
  padding: 6px 11px;
  border-radius: 999px;
  cursor: pointer;
}

.integral-calculator-with-steps-example-chip:hover {
  background: var(--integral-calculator-with-steps-teal);
  border-color: var(--integral-calculator-with-steps-teal);
  color: var(--integral-calculator-with-steps-white);
}

/* Full tabbed keypad - replaces the old single-row symbol toolbar. Dark
   navy panel (matches this plugin's header/hero gradient) containing a
   row of category tabs and, below it, a grid of insertable buttons for
   whichever category is active. Every button from the reference "All Math
   Inputs" grid is present, including ones with no engine behind them yet
   (those carry an explanatory title="..." tooltip saying so and still
   insert real, parseable syntax rather than doing nothing). */
.integral-calculator-with-steps-keypad {
  background: var(--integral-calculator-with-steps-navy);
  border-radius: 12px;
  padding: 10px;
  margin-bottom: 8px;
}

.integral-calculator-with-steps-keypad-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}

.integral-calculator-with-steps-keypad-tab {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.65);
  font-family: 'Inter', sans-serif;
  font-size: 11.5px;
  font-weight: 700;
  padding: 7px 10px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
}

.integral-calculator-with-steps-keypad-tab:hover {
  color: var(--integral-calculator-with-steps-white);
  background: rgba(255, 255, 255, 0.08);
}

.integral-calculator-with-steps-keypad-tab--active,
.integral-calculator-with-steps-keypad-tab--active:hover {
  background: var(--integral-calculator-with-steps-teal);
  color: var(--integral-calculator-with-steps-white);
}

.integral-calculator-with-steps-keypad-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 5px;
}

@media (max-width: 640px) {
  .integral-calculator-with-steps-keypad-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.integral-calculator-with-steps-keypad-grid button {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--integral-calculator-with-steps-white);
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  padding: 8px 4px;
  border-radius: 8px;
  cursor: pointer;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.integral-calculator-with-steps-keypad-grid button:hover {
  background: var(--integral-calculator-with-steps-teal);
  border-color: var(--integral-calculator-with-steps-teal);
}

.integral-calculator-with-steps-calculate-btn {
  background: var(--integral-calculator-with-steps-teal);
  color: var(--integral-calculator-with-steps-white);
  border: none;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 700;
  padding: 13px 20px;
  border-radius: 9px;
  cursor: pointer;
  width: 100%;
}

.integral-calculator-with-steps-calculate-btn:hover {
  background: var(--integral-calculator-with-steps-teal-dark);
}

.integral-calculator-with-steps-error {
  color: var(--integral-calculator-with-steps-red);
  font-size: 13.5px;
  font-weight: 600;
  background: #FEF2F2;
  border: 1px solid #FECACA;
  border-radius: 8px;
  padding: 10px 12px;
  margin: 0;
}

/* Results panel */
.integral-calculator-with-steps-results-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.integral-calculator-with-steps-hero-card {
  background: linear-gradient(135deg, var(--integral-calculator-with-steps-navy) 0%, var(--integral-calculator-with-steps-navy-mid) 100%);
  color: var(--integral-calculator-with-steps-white);
  border-radius: 12px;
  padding: 22px 24px;
}

.integral-calculator-with-steps-hero-label {
  margin: 0 0 8px 0;
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #94A3B8;
  font-weight: 600;
}

.integral-calculator-with-steps-hero-value {
  margin: 0;
  font-size: 24px;
  font-weight: 800;
  word-break: break-word;
  color: var(--integral-calculator-with-steps-teal-light);
}

.integral-calculator-with-steps-hero-sub {
  margin: 8px 0 0 0;
  font-size: 13px;
  color: #CBD5E1;
}

.integral-calculator-with-steps-steps-card {
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  border-radius: 12px;
  padding: 18px 20px;
}

.integral-calculator-with-steps-steps-card-title {
  margin: 0 0 14px 0;
  font-size: 16px;
  font-weight: 700;
}

.integral-calculator-with-steps-steps-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.integral-calculator-with-steps-step-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 0;
  border-bottom: 1px solid var(--integral-calculator-with-steps-gray);
}

.integral-calculator-with-steps-step-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.integral-calculator-with-steps-step-badge {
  display: inline-block;
  background: rgba(13, 148, 136, 0.1);
  color: var(--integral-calculator-with-steps-teal-dark);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  width: fit-content;
}

.integral-calculator-with-steps-step-text {
  font-size: 14px;
  margin: 0;
  line-height: 1.5;
  word-break: break-word;
}

.integral-calculator-with-steps-step-expr {
  font-size: 14.5px;
  font-weight: 600;
  margin: 0;
  color: var(--integral-calculator-with-steps-text);
  word-break: break-word;
}

.integral-calculator-with-steps-fallback-note {
  font-size: 13.5px;
  color: var(--integral-calculator-with-steps-amber);
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: 8px;
  padding: 10px 12px;
  margin: 0;
}

.integral-calculator-with-steps-export-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.integral-calculator-with-steps-btn-secondary {
  background: var(--integral-calculator-with-steps-white);
  border: 1px solid var(--integral-calculator-with-steps-gray-mid);
  color: var(--integral-calculator-with-steps-teal-dark);
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 13.5px;
  padding: 9px 16px;
  border-radius: 8px;
  cursor: pointer;
}

.integral-calculator-with-steps-btn-secondary:hover {
  background: var(--integral-calculator-with-steps-gray);
}

.integral-calculator-with-steps-btn-danger {
  color: var(--integral-calculator-with-steps-red);
}

.integral-calculator-with-steps-disclaimer {
  font-size: 12px;
  color: var(--integral-calculator-with-steps-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* Export card (off-screen PNG render target) */
.integral-calculator-with-steps-export-card {
  width: 640px;
  font-family: 'Inter', sans-serif;
  background: var(--integral-calculator-with-steps-white);
  padding: 28px;
}

.integral-calculator-with-steps-export-card-header {
  background: linear-gradient(135deg, var(--integral-calculator-with-steps-navy) 0%, var(--integral-calculator-with-steps-navy-mid) 100%);
  color: var(--integral-calculator-with-steps-white);
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 16px;
}

.integral-calculator-with-steps-export-card-header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
}

.integral-calculator-with-steps-export-card-fn {
  font-size: 14px;
  color: var(--integral-calculator-with-steps-text-muted);
  margin: 0 0 10px 0;
}

.integral-calculator-with-steps-export-card-result {
  font-size: 18px;
  font-weight: 700;
  color: var(--integral-calculator-with-steps-teal-dark);
  margin: 0 0 14px 0;
  word-break: break-word;
}

.integral-calculator-with-steps-export-card-rules {
  font-size: 13px;
  color: var(--integral-calculator-with-steps-text);
  margin: 0 0 14px 0;
  line-height: 1.7;
}

.integral-calculator-with-steps-export-card-footer {
  font-size: 11px;
  color: var(--integral-calculator-with-steps-text-muted);
  border-top: 1px solid var(--integral-calculator-with-steps-gray-mid);
  padding-top: 10px;
  margin-top: 10px;
}