/* ===================== MECHATONICS CALCULATOR SUITE ===================== */

.calc-layout {
  display: flex;
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1rem;
  position: relative;
  z-index: 1;
}

.calc-sidebar {
  width: 280px;
  flex-shrink: 0;
  position: sticky;
  top: 80px;
  align-self: flex-start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.calc-brand h1 {
  font-size: 1.6rem;
  color: var(--accent-secondary, #60a5fa);
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.calc-brand p {
  font-size: 0.85rem;
  color: var(--text-secondary, #94a3b8);
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

/* Category Tabs */
.calc-categories {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.calc-cat-btn {
  background: var(--bg-card, #1e293b);
  border: 1px solid var(--border-color, #334155);
  color: var(--text-secondary, #94a3b8);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.calc-cat-btn:hover {
  border-color: var(--accent-primary, #3b82f6);
  color: var(--text-primary, #f1f5f9);
}

.calc-cat-btn.active {
  background: linear-gradient(135deg, var(--accent-primary, #3b82f6), var(--accent-secondary, #60a5fa));
  color: #fff;
  border-color: transparent;
}

/* Memory Panel */
.calc-memory-panel {
  background: var(--bg-card, #1e293b);
  border: 1px solid var(--border-color, #334155);
  border-radius: 12px;
  padding: 1rem;
}

.calc-memory-panel h3 {
  font-size: 0.9rem;
  color: var(--accent-secondary, #60a5fa);
  margin: 1rem 0 0.5rem;
}

.calc-memory-panel h3:first-child {
  margin-top: 0;
}

.calc-var-form {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.calc-var-form input {
  background: var(--bg-primary, #0f172a);
  border: 1px solid var(--border-color, #334155);
  color: var(--text-primary, #f1f5f9);
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  font-size: 0.85rem;
}

.calc-var-form input:focus {
  outline: none;
  border-color: var(--accent-primary, #3b82f6);
}

.calc-var-form button {
  background: var(--accent-primary, #3b82f6);
  color: #fff;
  border: none;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
}

.calc-var-list,
.calc-history-list {
  max-height: 140px;
  overflow-y: auto;
  font-size: 0.8rem;
}

.calc-var-item {
  display: flex;
  justify-content: space-between;
  padding: 0.25rem 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  color: var(--text-secondary, #94a3b8);
}

.calc-var-item code {
  color: var(--accent-secondary, #60a5fa);
  font-family: 'JetBrains Mono', monospace;
}

.calc-var-item.ans {
  color: #f472b6;
}

.calc-empty {
  color: var(--text-secondary, #94a3b8);
  font-size: 0.8rem;
  font-style: italic;
  padding: 0.5rem 0;
}

.calc-hist-item {
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}

.calc-hist-title {
  color: var(--text-primary, #f1f5f9);
  font-size: 0.8rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.calc-hist-time {
  color: var(--text-secondary, #94a3b8);
  font-size: 0.7rem;
}

.calc-clear-btn {
  width: 100%;
  margin-top: 0.75rem;
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
  padding: 0.4rem;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
}

.calc-clear-btn:hover {
  background: rgba(239, 68, 68, 0.25);
}

/* Main Area */
.calc-main {
  flex: 1;
  min-width: 0;
}

.calc-category-pane {
  display: none;
  flex-direction: column;
  gap: 1.5rem;
}

.calc-category-pane.active {
  display: flex;
}

/* Calculator Cards */
.calc-card {
  background: var(--bg-card, #1e293b);
  border: 1px solid var(--border-color, #334155);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow, 0 2px 8px rgba(0,0,0,0.3));
  transition: box-shadow 0.2s ease;
}

.calc-card:hover {
  box-shadow: var(--shadow-hover, 0 4px 12px rgba(0,0,0,0.4));
}

.calc-card-wide {
  max-width: 100%;
}

.calc-card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color, #334155);
}

.calc-card-header h3 {
  color: var(--accent-secondary, #60a5fa);
  font-size: 1.15rem;
  margin-bottom: 0.3rem;
}

.calc-card-header p {
  color: var(--text-secondary, #94a3b8);
  font-size: 0.85rem;
  line-height: 1.4;
}

.calc-card-body {
  padding: 1.5rem;
}

/* Inputs */
.calc-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.calc-field label {
  font-size: 0.8rem;
  color: var(--text-secondary, #94a3b8);
  font-weight: 500;
}

.calc-field input,
.calc-field select {
  background: var(--bg-primary, #0f172a);
  border: 1px solid var(--border-color, #334155);
  color: var(--text-primary, #f1f5f9);
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: border-color 0.2s ease;
}

.calc-field input:focus,
.calc-field select:focus {
  outline: none;
  border-color: var(--accent-primary, #3b82f6);
}

.calc-field input::placeholder {
  color: rgba(148, 163, 184, 0.5);
}

/* Actions */
.calc-actions {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.calc-compute-btn {
  background: linear-gradient(135deg, var(--accent-primary, #3b82f6), var(--accent-secondary, #60a5fa));
  color: #fff;
  border: none;
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.calc-compute-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.calc-reset-btn {
  background: var(--bg-secondary, #1e293b);
  color: var(--text-secondary, #94a3b8);
  border: 1px solid var(--border-color, #334155);
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.calc-reset-btn:hover {
  border-color: var(--accent-primary, #3b82f6);
  color: var(--text-primary, #f1f5f9);
}

/* Results */
.calc-results {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(56, 189, 248, 0.15);
  border-radius: 10px;
  padding: 1rem;
  min-height: 0;
}

.calc-results-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.calc-result-item {
  background: var(--bg-card, #1e293b);
  border: 1px solid var(--border-color, #334155);
  border-radius: 8px;
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
}

.calc-result-item span {
  color: var(--text-secondary, #94a3b8);
}

.calc-result-item strong {
  color: var(--accent-secondary, #60a5fa);
  font-size: 1.1rem;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.calc-result-group {
  background: var(--bg-card, #1e293b);
  border: 1px solid var(--border-color, #334155);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  min-width: 180px;
}

.calc-result-group > strong {
  display: block;
  color: var(--accent-secondary, #60a5fa);
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.calc-error {
  color: #ef4444;
  font-size: 0.9rem;
  padding: 0.5rem;
}

/* Unit Converter */
.uc-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-bottom: 1rem;
}

.uc-tab {
  background: var(--bg-secondary, #1e293b);
  border: 1px solid var(--border-color, #334155);
  color: var(--text-secondary, #94a3b8);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
}

.uc-tab.active {
  background: var(--accent-primary, #3b82f6);
  color: #fff;
  border-color: transparent;
}

.uc-pane {
  display: none;
}

.uc-pane.active {
  display: block;
}

.uc-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.uc-row input,
.uc-row select {
  background: var(--bg-primary, #0f172a);
  border: 1px solid var(--border-color, #334155);
  color: var(--text-primary, #f1f5f9);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font-size: 0.9rem;
}

.uc-row input {
  width: 120px;
}

.uc-row select {
  min-width: 100px;
}

.uc-arrow {
  color: var(--text-secondary, #94a3b8);
  font-size: 1.2rem;
}

.uc-primary-result {
  font-size: 1.5rem;
  color: var(--accent-secondary, #60a5fa);
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 0.75rem;
}

.uc-all-results {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.4rem;
}

.uc-all-item {
  background: var(--bg-primary, #0f172a);
  border: 1px solid var(--border-color, #334155);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  font-size: 0.8rem;
  color: var(--text-secondary, #94a3b8);
}

/* Unit Circle Canvas */
#unit-circle-canvas {
  display: block;
  margin: 1rem auto;
  background: var(--bg-primary, #0f172a);
  border: 1px solid var(--border-color, #334155);
  border-radius: 12px;
  max-width: 100%;
}

.uc-info {
  text-align: center;
}

.uc-info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-secondary, #94a3b8);
}

.uc-info-grid strong {
  color: var(--accent-secondary, #60a5fa);
  font-family: 'JetBrains Mono', monospace;
}

/* Responsive */
@media (max-width: 960px) {
  .calc-layout {
    flex-direction: column;
  }

  .calc-sidebar {
    width: 100%;
    position: static;
    max-height: none;
  }

  .calc-categories {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .calc-cat-btn {
    flex: 1;
    min-width: 120px;
    text-align: center;
  }

  .calc-memory-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

  .calc-memory-panel h3:first-child {
    grid-column: 1;
  }

  .calc-memory-panel h3:nth-of-type(2) {
    grid-column: 2;
  }

  .calc-var-form {
    grid-column: 1;
    grid-row: 2;
  }

  .calc-var-list {
    grid-column: 1;
    grid-row: 3;
  }

  .calc-history-list {
    grid-column: 2;
    grid-row: 2 / span 2;
  }

  .calc-clear-btn {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .calc-inputs {
    grid-template-columns: 1fr;
  }

  .calc-memory-panel {
    grid-template-columns: 1fr;
  }

  .calc-memory-panel h3:nth-of-type(2),
  .calc-history-list {
    grid-column: 1;
    grid-row: auto;
  }

  .uc-info-grid {
    grid-template-columns: 1fr;
  }

  .uc-row {
    flex-direction: column;
    align-items: stretch;
  }

  .uc-row input,
  .uc-row select {
    width: 100%;
  }
}

/* ===================== CALCULATOR INTRO ===================== */
.calculator-intro {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem 1rem;
  position: relative;
  z-index: 1;
}

.calculator-intro h2 {
  font-size: 1.8rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.calculator-intro h3 {
  font-size: 1.25rem;
  color: var(--accent-secondary, #60a5fa);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.calculator-intro p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.calculator-intro strong {
  color: var(--text-primary);
}

.calculator-intro ul {
  color: var(--text-secondary);
  margin-left: 1.25rem;
  margin-bottom: 1rem;
}

.calculator-intro li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.calculator-intro code {
  background: var(--bg-card);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-secondary);
}

@media (max-width: 768px) {
  .calculator-intro {
    padding: 1.5rem 1rem 0.5rem;
  }

  .calculator-intro h2 {
    font-size: 1.5rem;
  }

  .calculator-intro h3 {
    font-size: 1.1rem;
  }
}

/* ===================== CALCULATOR UI / DEFINITIONS DIVIDER ===================== */
.calc-divider {
  text-align: center;
  margin: 48px 0 24px;
  position: relative;
  z-index: 1;
}

.calc-divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.calc-divider span {
  display: inline-block;
  padding: 0 16px;
  background: var(--bg-primary, #0f172a);
  color: #94a3b8;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  z-index: 1;
}

:root[data-theme="light"] .calc-divider::before {
  background: rgba(0, 0, 0, 0.1);
}

:root[data-theme="light"] .calc-divider span {
  background: var(--bg-primary, #f8fafc);
  color: #64748b;
}

@media (max-width: 768px) {
  .calc-divider {
    margin: 32px 0 16px;
  }

  .calc-divider span {
    font-size: 12px;
    padding: 0 12px;
  }
}