/* Design Tokens — Technical / Tool aesthetic */
:root {
  /* Type Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-body: 'General Sans', 'Inter', sans-serif;
  --font-display: 'General Sans', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
}

/* Light Mode (default) — J3 Automated Systems brand */
:root, [data-theme='light'] {
  --color-bg: #f3f5f7;
  --color-surface: #ffffff;
  --color-surface-2: #f8fafb;
  --color-surface-offset: #e8ecf0;
  --color-border: #c9d1d8;
  --color-divider: #dde2e7;
  --color-text: #121820;
  --color-text-muted: #5a6572;
  --color-text-faint: #97a1ab;
  --color-primary: #116389;
  --color-primary-hover: #0b4a68;
  --color-primary-highlight: #d4e8f2;
  --color-accent: #c05621;
  --color-accent-highlight: #fbe8d8;
  --color-warning: #b45309;
  --color-warning-highlight: #fef3c7;
  --color-error: #b91c1c;
  --color-success: #15803d;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.07);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.1);
}

/* Dark Mode — J3 brand */
[data-theme='dark'] {
  --color-bg: #0e1318;
  --color-surface: #161c22;
  --color-surface-2: #1c242c;
  --color-surface-offset: #131a20;
  --color-border: #2e3a46;
  --color-divider: #232e38;
  --color-text: #d1d7de;
  --color-text-muted: #7f8d9a;
  --color-text-faint: #4e5c6a;
  --color-primary: #4da3cc;
  --color-primary-hover: #3590ba;
  --color-primary-highlight: #162a38;
  --color-accent: #e5823a;
  --color-accent-highlight: #3a2a1a;
  --color-warning: #d97706;
  --color-warning-highlight: #3a2d14;
  --color-error: #ef4444;
  --color-success: #22c55e;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0e1318;
    --color-surface: #161c22;
    --color-surface-2: #1c242c;
    --color-surface-offset: #131a20;
    --color-border: #2e3a46;
    --color-divider: #232e38;
    --color-text: #d1d7de;
    --color-text-muted: #7f8d9a;
    --color-text-faint: #4e5c6a;
    --color-primary: #4da3cc;
    --color-primary-hover: #3590ba;
    --color-primary-highlight: #162a38;
    --color-accent: #e5823a;
    --color-accent-highlight: #3a2a1a;
    --color-warning: #d97706;
    --color-warning-highlight: #3a2d14;
    --color-error: #ef4444;
    --color-success: #22c55e;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  }
}

/* Layout */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
}

.brand-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.brand-logo {
  height: 36px;
  width: auto;
  object-fit: contain;
}

/* Logo theme switching */
.brand-logo-light { display: none; }
.brand-logo-dark { display: block; }

[data-theme='dark'] .brand-logo-light { display: block; }
[data-theme='dark'] .brand-logo-dark { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .brand-logo-light { display: block; }
  :root:not([data-theme]) .brand-logo-dark { display: none; }
}

.brand-divider {
  width: 1px;
  height: 28px;
  background: var(--color-border);
}

.app-header h1 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.export-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-surface);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
}

.export-btn:hover {
  background: var(--color-primary-hover);
}

.export-btn svg {
  flex-shrink: 0;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}
.theme-toggle:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}

/* Main Grid */
.main-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: var(--space-6);
  align-items: start;
}

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

/* Panel */
.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.panel-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
}

.panel-title svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

/* Form Controls */
.control-group {
  margin-bottom: var(--space-5);
}

.control-group:last-child {
  margin-bottom: 0;
}

.control-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.control-row {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.control-input {
  flex: 1;
  height: 44px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  font-size: var(--text-sm);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
}

.control-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}

.control-unit {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  white-space: nowrap;
  min-width: 36px;
}

.slider-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 600;
  min-width: 72px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  flex-shrink: 0;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-divider);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: 2px solid var(--color-surface);
  box-shadow: var(--shadow-sm);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: 2px solid var(--color-surface);
  box-shadow: var(--shadow-sm);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--color-divider);
  margin: var(--space-5) 0;
}

/* Constraint Toggles */
.constraint-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  cursor: pointer;
  width: 100%;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.constraint-toggle:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.constraint-toggle.active {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.constraint-toggle .icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.constraint-inner {
  margin-top: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-divider);
}

/* Results Panel */
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

@media (max-width: 600px) {
  .results-grid {
    grid-template-columns: 1fr;
  }
}

.result-card {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  border: 1px solid var(--color-divider);
  text-align: center;
}

.result-card .label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.result-card .value {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.result-card .unit {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 400;
}

.result-card.primary {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
}

.result-card.primary .value {
  color: var(--color-primary);
}

/* Diagram Container */
.diagram-container {
  background: var(--color-bg);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
}

.diagram-container svg {
  width: 100%;
  height: auto;
}

/* Angle Results */
.angle-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.angle-card {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  border: 1px solid var(--color-divider);
}

.angle-card .seat-name {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.angle-card .angle-value {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.angle-card .angle-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-1);
}

.angle-ok { color: var(--color-success); }
.angle-warn { color: var(--color-warning); }
.angle-bad { color: var(--color-error); }

/* Status badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
}

.status-badge.ok {
  background: color-mix(in srgb, var(--color-success) 15%, transparent);
  color: var(--color-success);
}

.status-badge.warn {
  background: var(--color-warning-highlight);
  color: var(--color-warning);
}

.status-badge.bad {
  background: color-mix(in srgb, var(--color-error) 15%, transparent);
  color: var(--color-error);
}

/* Tooltip-style info */
.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
}

.info-row:last-child {
  border-bottom: none;
}

.info-row .info-label {
  color: var(--color-text-muted);
}

.info-row .info-value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
}

/* Constraint chips */
.constraints-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

/* Section Subtitle */
.section-subtitle {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  margin-top: var(--space-5);
}

/* Warning Banner */
.warning-banner {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  margin-bottom: var(--space-5);
  background: color-mix(in srgb, var(--color-error) 10%, var(--color-surface));
  border: 1px solid color-mix(in srgb, var(--color-error) 30%, transparent);
  border-radius: var(--radius-md);
  animation: shake 0.4s ease-in-out;
}

.warning-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  line-height: 1;
}

.warning-content {
  flex: 1;
}

.warning-title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-error);
  margin-bottom: var(--space-1);
}

.warning-msg {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.warning-msg strong {
  color: var(--color-text);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}

/* Notes */
.notes {
  margin-top: var(--space-5);
  padding: var(--space-4);
  background: var(--color-accent-highlight);
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--color-accent) 20%, transparent);
}

.notes p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.notes p + p {
  margin-top: var(--space-2);
}

.notes strong {
  color: var(--color-text);
}