/* ============================================
   HSHN High-Dimensional Demo — Stylesheet
   Premium dark theme with glassmorphism
   ============================================ */

:root {
  --bg-deep: #06080d;
  --bg-surface: #0d1117;
  --bg-card: rgba(15, 20, 30, 0.75);
  --bg-card-hover: rgba(20, 28, 42, 0.85);
  --border-glass: rgba(80, 120, 200, 0.12);
  --border-glow: rgba(100, 140, 255, 0.25);

  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #484f58;

  --accent-blue: #58a6ff;
  --accent-green: #3fb950;
  --accent-amber: #d29922;
  --accent-purple: #bc8cff;
  --accent-red: #f85149;
  --accent-cyan: #39d2c0;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-panel: 0 4px 24px rgba(0, 0, 0, 0.4), 0 0 1px rgba(100, 140, 255, 0.1);
  --transition-fast: 150ms ease;
  --transition-med: 250ms ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
  background: 
    radial-gradient(ellipse at 20% 0%, rgba(88, 166, 255, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 100%, rgba(188, 140, 255, 0.05) 0%, transparent 50%),
    var(--bg-deep);
}

/* ============================================
   Header
   ============================================ */

#main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: rgba(13, 17, 23, 0.9);
  border-bottom: 1px solid var(--border-glass);
  backdrop-filter: blur(12px);
  flex-shrink: 0;
  gap: 16px;
  z-index: 10;
}

.header-left h1 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.3px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.header-left p {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 1px;
}

.header-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.formula-group {
  display: flex;
  gap: 4px;
  background: rgba(0, 0, 0, 0.3);
  padding: 3px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.formula-btn {
  padding: 5px 12px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.formula-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

.formula-btn.active {
  color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.12);
  box-shadow: 0 0 8px rgba(88, 166, 255, 0.15);
}

.formula-info {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.04);
  transition: opacity var(--transition-med);
  opacity: 0;
  min-height: 18px;
  text-align: center;
}

.formula-info.visible { opacity: 1; }

.formula-info .hl {
  color: var(--accent-cyan);
  font-weight: 500;
}

.n-selector {
  display: flex;
  align-items: center;
  gap: 6px;
}

.n-selector label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.n-btn {
  padding: 5px 14px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.n-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-glow);
}

.n-btn.active {
  color: var(--accent-purple);
  background: rgba(188, 140, 255, 0.12);
  border-color: rgba(188, 140, 255, 0.3);
}

/* ============================================
   Main Layout
   ============================================ */

#app-main {
  flex: 1;
  display: flex;
  overflow: hidden;
  min-height: 0;
}

/* ============================================
   Sidebar Controls
   ============================================ */

#controls-sidebar {
  width: 210px;
  flex-shrink: 0;
  padding: 12px;
  overflow-y: auto;
  background: rgba(13, 17, 23, 0.6);
  border-right: 1px solid var(--border-glass);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#controls-sidebar::-webkit-scrollbar { width: 4px; }
#controls-sidebar::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
}

.control-section h3 {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 600;
}

.btn-row {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}

.ctrl-btn {
  flex: 1;
  padding: 7px 10px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ctrl-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}

.ctrl-btn.primary {
  background: rgba(88, 166, 255, 0.12);
  border-color: rgba(88, 166, 255, 0.25);
  color: var(--accent-blue);
}

.ctrl-btn.primary:hover {
  background: rgba(88, 166, 255, 0.2);
}

.ctrl-btn.running {
  background: rgba(63, 185, 80, 0.15);
  border-color: rgba(63, 185, 80, 0.3);
  color: var(--accent-green);
}

.ctrl-btn.muted {
  background: rgba(248, 81, 73, 0.12);
  border-color: rgba(248, 81, 73, 0.25);
  color: var(--accent-red);
}

.ctrl-btn.full-width {
  width: 100%;
  margin-bottom: 2px;
}

.ctrl-btn.recommend {
  background: linear-gradient(135deg, rgba(188, 140, 255, 0.15), rgba(88, 166, 255, 0.15));
  border-color: rgba(188, 140, 255, 0.35);
  color: var(--accent-purple);
  font-weight: 600;
  letter-spacing: 0.3px;
  margin-top: 4px;
}

.ctrl-btn.recommend:hover {
  background: linear-gradient(135deg, rgba(188, 140, 255, 0.25), rgba(88, 166, 255, 0.25));
  color: #fff;
  box-shadow: 0 0 10px rgba(188, 140, 255, 0.25);
}

.rule-select {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.35);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 11.5px;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast);
}

.rule-select:hover, .rule-select:focus {
  border-color: var(--border-glow);
}

.rule-select option {
  background: #14181f;
  color: var(--text-primary);
}

.rule-meta {
  font-family: var(--font-sans);
  font-size: 10px;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.22);
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.04);
  line-height: 1.45;
  margin: 4px 0 4px;
}

.rule-meta .rule-desc {
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.rule-meta .rule-coeffs {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent-cyan);
  word-break: break-word;
}

.control-group {
  margin-bottom: 8px;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.val-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent-cyan);
  background: rgba(57, 210, 192, 0.08);
  padding: 1px 5px;
  border-radius: 3px;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-blue);
  border: 2px solid var(--bg-surface);
  box-shadow: 0 0 6px rgba(88, 166, 255, 0.4);
  cursor: pointer;
}

.status-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
}

.stat-row span:first-child {
  color: var(--text-muted);
  font-size: 10px;
}

.stat-row span:last-child {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
}

/* ============================================
   Panels Grid
   ============================================ */

#panels-grid {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 8px;
  padding: 8px;
  min-width: 0;
  min-height: 0;
}

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
  transition: border-color var(--transition-med);
}

.panel:hover {
  border-color: var(--border-glow);
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  flex-shrink: 0;
}

.panel-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-blue { background: var(--accent-blue); box-shadow: 0 0 6px rgba(88, 166, 255, 0.5); }
.dot-green { background: var(--accent-green); box-shadow: 0 0 6px rgba(63, 185, 80, 0.5); }
.dot-amber { background: var(--accent-amber); box-shadow: 0 0 6px rgba(210, 153, 34, 0.5); }
.dot-purple { background: var(--accent-purple); box-shadow: 0 0 6px rgba(188, 140, 255, 0.5); }

.panel-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

.panel-badge {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 1px 6px;
  border-radius: 3px;
}

.panel-body {
  flex: 1;
  position: relative;
  min-height: 0;
  min-width: 0;
}

.panel-body canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* PCA canvas needs to not have position absolute for Three.js */
#panel-pca .panel-body canvas {
  display: block;
}

/* ============================================
   Animations
   ============================================ */

@keyframes pulse-glow {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1.0; }
}

.panel-dot {
  animation: pulse-glow 3s ease-in-out infinite;
}

.dot-green { animation-delay: 0.5s; }
.dot-amber { animation-delay: 1.0s; }
.dot-purple { animation-delay: 1.5s; }

/* ============================================
   Vector Field Toggle
   ============================================ */

.vf-toggle-btn {
  margin-left: auto;
  padding: 3px 10px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.vf-toggle-btn:hover {
  color: var(--text-secondary);
  border-color: var(--border-glow);
  background: rgba(255, 255, 255, 0.05);
}

.vf-toggle-btn.active {
  color: var(--accent-cyan);
  background: rgba(57, 210, 192, 0.12);
  border-color: rgba(57, 210, 192, 0.35);
  box-shadow: 0 0 8px rgba(57, 210, 192, 0.2);
}