/* =========================================================
   Brighterly Long Division Calculator
   ========================================================= */

:root {
  /* ── Brighterly Brand Purple ── */
  --color-purple-50:  #F3F1FF;
  --color-purple-100: #E9E6FF;
  --color-purple-200: #D4CFFF;
  --color-purple-300: #B8B0FF;
  --color-purple-400: #9B91FF;
  --color-purple-500: #7B69FF;
  --color-purple-600: #6655E8;
  --color-purple-700: #5042C7;
  --color-purple-800: #3A2FA0;
  --color-purple-900: #211C6B;

  /* ── Accents ── */
  --color-emerald-500: #00BC7D;
  --color-amber-400:   #FBBF24;
  --color-slate-400:   #90A1B9;
  --color-blue-500:    #3B82F6;

  /* ── Neutrals ── */
  --color-white:      #FFFFFF;
  --color-gray-text:  #1E1B4B;
  --color-gray-muted: #6B7280;

  --focus-ring: 0 0 0 3px rgba(123, 105, 255, 0.18);

  --ld-cell: 34px;
}

/* =========================================================
   Base — scoped to .brighterly-ld-root
   ========================================================= */

.brighterly-ld-root,
.brighterly-ld-root *,
.brighterly-ld-root *::before,
.brighterly-ld-root *::after { box-sizing: border-box; }

.brighterly-ld-root {
  font-family: 'Rubik', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  font-weight: 400;
  font-size: 18px;
  line-height: 24px;
  color: var(--color-gray-text);
  background: var(--color-purple-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  border-radius: 24px;
  padding: 8px;
}

.brighterly-ld-root h1,
.brighterly-ld-root h2,
.brighterly-ld-root h3,
.brighterly-ld-root h4,
.brighterly-ld-root h5,
.brighterly-ld-root h6,
.brighterly-ld-root p { margin: 0; }

.brighterly-ld-root button { font-family: inherit; }

.brighterly-ld-root input[type="number"]::-webkit-outer-spin-button,
.brighterly-ld-root input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.brighterly-ld-root input[type="number"] { -moz-appearance: textfield; }

/* =========================================================
   Page layout
   ========================================================= */

.page-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px 64px;
}

/* =========================================================
   Calculator card
   ========================================================= */

.calculator-card {
  background: var(--color-white);
  border: 1px solid var(--color-purple-200);
  border-radius: 24px;
  padding: 40px;
}

/* =========================================================
   Inputs
   ========================================================= */

.ld-inputs-row {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

.ld-term {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.ld-term-label {
  font-family: 'Rubik', sans-serif;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-gray-muted);
  margin-bottom: 6px;
}

.ld-input {
  width: 160px;
  min-height: 56px;
  border: 1.5px solid var(--color-purple-200);
  border-radius: 12px;
  padding: 10px 12px;
  font-family: 'Rubik', sans-serif;
  font-size: 26px;
  font-weight: 600;
  color: var(--color-gray-text);
  text-align: center;
  background: var(--color-white);
  font-variant-numeric: tabular-nums;
  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}

.ld-input::placeholder { color: var(--color-purple-300); font-weight: 500; opacity: 1; }

.ld-input:focus {
  outline: none;
  border-color: var(--color-purple-500);
  background: var(--color-purple-50);
  box-shadow: 0 0 0 3px rgba(123, 105, 255, 0.12);
}

.ld-divide-sign {
  font-family: 'Rubik', sans-serif;
  font-weight: 700;
  font-size: 32px;
  color: var(--color-purple-500);
  line-height: 56px;
  user-select: none;
}

.input-error {
  min-height: 16px;
  margin-top: 14px;
  color: #DC2626;
  font-size: 13px;
  font-weight: 500;
  line-height: 18px;
  text-align: center;
}

/* =========================================================
   Calculate button
   ========================================================= */

.calculate-btn {
  background: var(--color-purple-500);
  color: var(--color-white);
  border: none;
  border-radius: 12px;
  padding: 16px 40px;
  font-family: 'Rubik', sans-serif;
  font-weight: 600;
  font-size: 18px;
  cursor: pointer;
  width: 100%;
  margin-top: 24px;
  min-height: 56px;
  transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
}

.calculate-btn:hover { background: var(--color-purple-600); transform: scale(1.02); }
.calculate-btn:active { transform: scale(0.98); }
.calculate-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }

/* =========================================================
   Result card
   ========================================================= */

.result-card {
  background: var(--color-white);
  border-radius: 20px;
  border: 1px solid var(--color-purple-200);
  border-left: 5px solid var(--color-emerald-500);
  padding: 24px 28px;
  margin-top: 24px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.35s ease, transform 0.35s ease;
  display: none;
}

.result-card.visible { display: block; opacity: 1; transform: translateY(0); }

.result-label {
  font-family: 'Rubik', sans-serif;
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-emerald-500);
  margin-bottom: 16px;
  text-align: left;
}

.result-primary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.result-primary-value {
  font-family: 'Rubik', sans-serif;
  font-size: 36px;
  font-weight: 700;
  color: var(--color-gray-text);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.result-primary-caption {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-gray-muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.stat-cell {
  background: var(--color-purple-50);
  border: 1px solid var(--color-purple-100);
  border-radius: 12px;
  padding: 14px 16px;
  text-align: left;
}

.stat-name {
  font-family: 'Rubik', sans-serif;
  font-weight: 600;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-gray-muted);
  margin-bottom: 6px;
}

.stat-value {
  font-family: 'Rubik', sans-serif;
  font-weight: 600;
  font-size: 20px;
  color: var(--color-gray-text);
  line-height: 1.2;
  word-break: break-word;
  font-variant-numeric: tabular-nums;
}

/* =========================================================
   Long-division tableau
   ========================================================= */

.tableau-container { margin-top: 32px; }

.tableau-heading {
  font-family: 'Rubik', sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--color-gray-text);
  margin-bottom: 16px;
}

.ld-tableau {
  overflow-x: auto;
  padding: 20px 8px 8px;
  background: var(--color-purple-50);
  border: 1px solid var(--color-purple-100);
  border-radius: 16px;
}

.ld-grid {
  display: grid;
  justify-content: start;
  width: max-content;
  margin: 0 auto;
  font-family: 'Rubik', sans-serif;
  font-variant-numeric: tabular-nums;
}

.ld-cell {
  width: var(--ld-cell);
  height: var(--ld-cell);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 600;
  color: var(--color-gray-text);
  line-height: 1;
}

.ld-cell.ld-label {
  width: auto;
  padding-right: 6px;
  justify-content: flex-end;
  white-space: nowrap;
}

.ld-cell.ld-divisor {
  color: var(--color-purple-700);
  font-weight: 700;
}

.ld-cell.ld-quotient {
  color: var(--color-purple-600);
  font-weight: 700;
}

.ld-cell.ld-vinculum {
  border-top: 2px solid var(--color-purple-500);
}

.ld-cell.ld-dividend {
  color: var(--color-gray-text);
}

.ld-cell.ld-product {
  color: var(--color-gray-muted);
}

.ld-cell.ld-bar {
  border-bottom: 2px solid var(--color-purple-300);
}

.ld-cell.ld-remainder {
  color: var(--color-blue-500);
  font-weight: 700;
}

.tableau-note {
  font-size: 13px;
  color: var(--color-gray-muted);
  margin-top: 12px;
}

/* =========================================================
   Step-by-step
   ========================================================= */

.steps-container { margin-top: 32px; }

.steps-heading {
  font-family: 'Rubik', sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--color-gray-text);
  margin-bottom: 20px;
}

.steps-list { list-style: none; margin: 0; padding: 0; }

.step-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-start;
}

.step-badge {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-purple-500);
  color: var(--color-white);
  font-family: 'Rubik', sans-serif;
  font-weight: 600;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-body { flex: 1; min-width: 0; }

.step-title {
  font-family: 'Rubik', sans-serif;
  font-weight: 600;
  font-size: 16px;
  color: var(--color-blue-500);
  margin-bottom: 8px;
}

.step-content {
  font-size: 16px;
  line-height: 24px;
  color: var(--color-gray-text);
  word-break: break-word;
}

.step-content .muted { color: var(--color-gray-muted); }
.step-content strong { font-weight: 600; }

/* =========================================================
   Responsive — mobile ≤ 768px
   ========================================================= */

@media (max-width: 768px) {
  .page-container { padding: 0 16px 48px; }
  .calculator-card { padding: 24px; border-radius: 20px; }

  .ld-input { width: 130px; font-size: 22px; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .result-primary-value { font-size: 30px; }

  .steps-heading, .tableau-heading { font-size: 18px; }
  .step-title { font-size: 15px; }
  .step-content { font-size: 15px; line-height: 22px; }

  :root { --ld-cell: 28px; }
  .ld-cell { font-size: 17px; }
}

@media (max-width: 420px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
}