/* ============================================================
   css/exp9_new.css
   ============================================================ */

:root {
  --bg: #eceeff;
  --surface: rgba(255,255,255,0.65);
  --border: rgba(255,255,255,0.4);
  --border-dark: rgba(0,0,0,0.08);
  --border-radius: 14px;
  --panel-radius: 12px;
  --text: #0f0f1a;
  --muted: #475569;
  --cyan: #06b6d4;
  --green: #10b981;
  --rose: #f43f5e;
  --blue: #1a56db;
  --purple: #7c3aed;
  --font-body: -apple-system, 'SF Pro Display', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

.page {
  padding-top: var(--lf-main-padding-top, 120px);
  max-width: 1440px;
  margin: 0 auto;
  padding-left: 2rem;
  padding-right: 2rem;
  padding-bottom: 4rem;
  position: relative;
  z-index: 10;
}

/* Page Header */
.page-header {
  margin-bottom: 2rem;
}
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.badge {
  background: rgba(124, 58, 237, 0.15);
  color: var(--purple);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(124, 58, 237, 0.3);
  font-weight: 700;
}
.page-header h1 {
  font-family: 'Playfair Display', serif;
  font-size: 2.2rem;
  color: var(--text);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.page-header p {
  font-size: 0.95rem;
  color: var(--muted);
  max-width: 700px;
  line-height: 1.6;
}

/* Zone Architecture */
.zones-container {
  display: grid;
  grid-template-columns: 240px 1fr 340px;
  gap: 1.5rem;
  align-items: start;
}

/* Glass Panels */
.glass-card {
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: 0 8px 32px rgba(15, 15, 26, 0.06);
}

.card-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.card-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-dark);
}

/* Zone 1: Navigation */
.lab-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}
.lab-nav li {
  margin-bottom: 0.4rem;
}
.lab-nav a {
  display: block;
  padding: 0.6rem 0.8rem;
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 8px;
  transition: all 0.2s;
  cursor: pointer;
}
.lab-nav a:hover, .lab-nav a.active {
  background: rgba(124, 58, 237, 0.1);
  color: var(--purple);
}

/* Zone 2: Simulator and other center tabs */
.zone-2 {
  display: flex;
  flex-direction: column;
  min-height: 500px;
}

.core-tab-panel {
  display: none;
}
.core-tab-panel.active {
  display: block;
}
#tab-simulation.active {
  display: flex;
  flex-direction: column;
}

.sim-heading {
  margin-bottom: 0;
  justify-content: space-between;
}
.sim-status {
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--green);
}

/* Model Viewer Container */
.viewer-container {
  flex: 1;
  width: 100%;
  height: 60vh;
  min-height: 500px;
  border: 1px solid rgba(15, 15, 26, 0.08);
  border-radius: var(--panel-radius);
  background: rgba(255,255,255,0.7);
  box-shadow: 0 16px 40px rgba(15, 15, 26, 0.06);
  margin-top: 1rem;
  position: relative;
  overflow: hidden;
}

model-viewer {
  width: 100%;
  height: 100%;
  background-color: transparent;
  outline: none;
}

/* Controls Overlay */
.controls-overlay {
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 10;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(15, 15, 26, 0.12);
  color: #0f0f1a;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  box-shadow: 0 4px 12px rgba(15, 15, 26, 0.04);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.95);
  transform: translateY(-1px);
}

/* --- Clean Component Selector --- */
.component-selector {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.comp-btn {
  background: white;
  border: 1px solid rgba(0, 0, 0, 0.1);
  color: var(--text);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.comp-btn::after {
  content: "→";
  opacity: 0.5;
  transition: transform 0.2s;
}

.comp-btn:hover {
  background: var(--primary, var(--purple));
  color: white;
  transform: translateX(4px);
  box-shadow: 0 4px 10px rgba(124, 58, 237, 0.3);
}

.comp-btn:hover::after {
  opacity: 1;
  transform: translateX(4px);
}

.comp-btn.active {
  background: var(--primary, var(--purple));
  color: white;
  border-color: var(--primary, var(--purple));
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.comp-btn.active::after {
  content: "✓";
  opacity: 1;
}

/* Zone 3: Theory Panel */
.mb-4 { margin-bottom: 1rem; }
.theory-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text);
}

/* Reading content styles for Aim, Theory etc. */
.read-content h2 { margin-top: 0; color: var(--text); }
.read-content h3 { color: var(--text); }
.read-content p { line-height: 1.6; color: var(--muted); margin-bottom: 1rem; }
.read-content ul, .read-content ol { line-height: 1.6; color: var(--muted); padding-left: 1.5rem; }
.read-content li { margin-bottom: 0.5rem; }