/* ==========================================================================
   OmniOperand — Interactive Calculator Stylesheet (calculator.css)
   HUD Panels, Dual-Column Solver Grid, Coordinate SVG Canvas, Sliders, LLM Box
   ========================================================================== */

/* Main Solver Layout */
.calculator-hero {
  padding: 2.5rem 0 1.5rem;
}

.calc-title-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  border: 1px solid rgba(6, 182, 212, 0.25);
  margin-bottom: 0.75rem;
}

.solver-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  margin: 2rem 0;
  align-items: start;
}

/* Left Panel: Controls & Parameter Matrix */
.solver-panel {
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  position: relative;
}

/* Top Toolbar: Units, Precision & Preset Actions */
.solver-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toolbar-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.segmented-control {
  display: inline-flex;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2px;
  gap: 2px;
}

.segmented-control button {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.segmented-control button:hover {
  color: var(--text-primary);
}

.segmented-control button.active {
  background: var(--accent-cyan);
  color: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

/* Input Selector Bar */
.driver-selector-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
}

.driver-selector-bar label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.driver-dropdown {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  width: 100%;
}

.driver-dropdown:focus {
  border-color: var(--accent-cyan);
}

/* Parameter Cards Matrix */
.parameter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.param-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  transition: all 0.2s ease;
  position: relative;
  cursor: pointer;
}

.param-card:hover {
  border-color: var(--border-active);
  background: rgba(19, 28, 49, 0.9);
}

.param-card.is-driver {
  border-color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.08);
  box-shadow: 0 0 16px -2px var(--accent-cyan-glow);
}

.param-card.highlighted {
  border-color: var(--accent-blue);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.3);
}

.param-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.param-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.param-symbol {
  font-family: var(--font-math);
  font-style: italic;
  font-weight: 700;
  color: var(--accent-cyan);
  font-size: 1rem;
}

.param-status-tag {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.param-status-tag.input {
  background: rgba(6, 182, 212, 0.2);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.4);
}

.param-status-tag.calculated {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.param-input-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.param-input {
  width: 100%;
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  outline: none;
  padding: 0.2rem 0;
}

.param-input:focus {
  color: var(--accent-cyan);
}

.param-unit {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  user-select: none;
}

.param-slider {
  width: 100%;
  margin-top: 0.5rem;
  height: 4px;
  accent-color: var(--accent-cyan);
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.15s ease;
}

.param-slider:hover, .param-card.is-driver .param-slider {
  opacity: 1;
}

.param-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px dashed rgba(255, 255, 255, 0.06);
  padding-top: 0.35rem;
}

.param-exact {
  font-family: var(--font-math);
  color: var(--accent-violet);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.copy-param-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.1rem 0.25rem;
  border-radius: 3px;
  font-size: 0.7rem;
  transition: color 0.15s;
}

.copy-param-btn:hover {
  color: var(--accent-cyan);
}

/* Right Panel: Interactive Coordinate Canvas */
.canvas-panel {
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
}

.canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.canvas-title {
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.canvas-wrapper {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at center, rgba(13, 19, 34, 0.95) 0%, rgba(7, 10, 18, 0.98) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.octagon-svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* SVG Interactive Styles */
.svg-grid-line {
  stroke: rgba(255, 255, 255, 0.06);
  stroke-width: 1;
}

.svg-axis {
  stroke: rgba(56, 189, 248, 0.2);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
}

.svg-polygon-shape {
  fill: rgba(6, 182, 212, 0.1);
  stroke: var(--accent-cyan);
  stroke-width: 2.5;
  stroke-linejoin: round;
  transition: fill 0.25s ease, stroke 0.25s ease;
}

.svg-polygon-shape:hover {
  fill: rgba(6, 182, 212, 0.18);
  stroke: var(--accent-blue);
}

.svg-incircle {
  fill: none;
  stroke: rgba(16, 185, 129, 0.35);
  stroke-width: 1.5;
  stroke-dasharray: 5 4;
}

.svg-circumcircle {
  fill: none;
  stroke: rgba(168, 85, 247, 0.35);
  stroke-width: 1.5;
  stroke-dasharray: 5 4;
}

.svg-dimension-line {
  stroke-width: 2;
  transition: stroke 0.2s, stroke-width 0.2s;
}

.svg-dimension-line.active {
  stroke-width: 3.5;
  filter: drop-shadow(0 0 6px var(--accent-cyan));
}

.svg-vertex-dot {
  fill: var(--accent-cyan);
  stroke: #fff;
  stroke-width: 1.5;
  cursor: pointer;
  transition: transform 0.2s ease, fill 0.2s ease;
}

.svg-vertex-dot:hover {
  fill: var(--accent-amber);
  transform: scale(1.3);
}

.canvas-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.75rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

/* Step-by-Step Derivation Section */
.proofs-section {
  margin: 3.5rem 0;
}

.proof-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.proof-card:hover {
  border-color: var(--border-active);
}

.proof-header {
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.02);
  user-select: none;
}

.proof-header h3 {
  margin: 0;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.proof-toggle-icon {
  transition: transform 0.2s ease;
}

.proof-card.open .proof-toggle-icon {
  transform: rotate(180deg);
}

.proof-body {
  padding: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: none;
}

.proof-card.open .proof-body {
  display: block;
}

.proof-step {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
  align-items: flex-start;
}

.step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

/* LLM System Prompt & Integration Box */
.llm-box {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.08), rgba(6, 182, 212, 0.06));
  border: 1px solid rgba(168, 85, 247, 0.3);
  border-radius: var(--radius-xl);
  padding: 2rem;
  margin: 3.5rem 0;
  position: relative;
  overflow: hidden;
}

.llm-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-violet), var(--accent-cyan));
}

.llm-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.llm-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(168, 85, 247, 0.2);
  color: var(--accent-violet);
  border: 1px solid rgba(168, 85, 247, 0.4);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  text-transform: uppercase;
}

.llm-prompt-code {
  background: #030712;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #e2e8f0;
  line-height: 1.5;
  white-space: pre-wrap;
  max-height: 320px;
  overflow-y: auto;
  margin: 1rem 0;
}

.llm-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* FAQ Accordion */
.faq-section {
  margin: 3.5rem 0;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-question {
  padding: 1.15rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  user-select: none;
}

.faq-answer {
  padding: 0 1.25rem 1.25rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  transition: transform 0.2s ease;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .solver-container {
    grid-template-columns: 1fr;
  }
  .canvas-panel {
    position: static;
  }
  .parameter-grid {
    grid-template-columns: 1fr;
  }
}