/* -------------------------------------------------------------------------- */
/* Bi-Mind Engine - CSS Design System                                          */
/* -------------------------------------------------------------------------- */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg-dark: #070913;
  --bg-card: rgba(15, 23, 42, 0.65);
  --bg-card-hover: rgba(30, 41, 59, 0.75);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-highlight: rgba(0, 255, 204, 0.3);

  --accent-cyan: #00FFCC;
  --accent-cyan-glow: rgba(0, 255, 204, 0.25);
  --accent-purple: #8A2BE2;
  --accent-purple-glow: rgba(138, 43, 226, 0.3);
  --accent-emerald: #00FF88;
  --accent-red: #FF3366;
  --accent-amber: #FFB800;

  --text-main: #F1F5F9;
  --text-muted: #94A3B8;
  --text-dim: #64748B;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(at 10% 10%, rgba(138, 43, 226, 0.15) 0px, transparent 50%),
    radial-gradient(at 90% 90%, rgba(0, 255, 204, 0.12) 0px, transparent 50%);
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.5;
}

/* Header & Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: 0 0 16px var(--accent-cyan-glow);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #FFFFFF, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 4px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  background: linear-gradient(135deg, rgba(0, 255, 204, 0.2), rgba(138, 43, 226, 0.2));
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 255, 204, 0.4);
  box-shadow: 0 0 12px var(--accent-cyan-glow);
}

.btn-pdf-download {
  background: rgba(0, 255, 204, 0.12);
  border: 1px solid var(--border-highlight);
  color: var(--accent-cyan);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-pdf-download:hover {
  background: var(--accent-cyan);
  color: #000;
  box-shadow: 0 0 12px var(--accent-cyan-glow);
}

.btn-bi-mind-link {
  background: rgba(138, 43, 226, 0.15);
  border: 1px solid rgba(138, 43, 226, 0.4);
  color: #D8B4FE;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-bi-mind-link:hover {
  background: var(--accent-purple);
  color: #FFF;
  box-shadow: 0 0 14px var(--accent-purple-glow);
}

/* Main Container */
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 1.5rem;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Bi-Mind Overview Hero Banner */
.bi-mind-hero-card {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.7));
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-highlight);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 0 30px rgba(0, 255, 204, 0.08);
}

.hero-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

/* Bi-Mind 4 Pillars Feature Grid */
.bi-mind-features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

@media (max-width: 1100px) {
  .bi-mind-features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.bi-mind-feature-card {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  transition: all 0.25 ease;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.bi-mind-feature-card:hover {
  border-color: var(--accent-cyan);
  background: rgba(0, 255, 204, 0.05);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.feature-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFF;
}

.feature-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Control Bar */
.control-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  padding: 1rem 1.5rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.control-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.control-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
}

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

input[type="range"] {
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

select, button.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

select:hover, button.btn-secondary:hover {
  border-color: var(--accent-cyan);
}

.view-toggle {
  display: flex;
  background: rgba(0, 0, 0, 0.3);
  padding: 3px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.view-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.view-btn.active {
  background: var(--accent-cyan);
  color: #000;
  font-weight: 600;
}

/* Canvas Simulation Grid */
.canvas-grid {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.grid-split {
  grid-template-columns: 1fr 1fr;
}

.grid-single {
  grid-template-columns: 1fr;
}

@media (max-width: 992px) {
  .grid-split {
    grid-template-columns: 1fr;
  }
}

.canvas-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border-radius: 16px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.canvas-header {
  padding: 0.75rem 1.25rem;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.engine-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.method-a-badge {
  background: rgba(255, 51, 102, 0.15);
  color: var(--accent-red);
  border: 1px solid rgba(255, 51, 102, 0.3);
}

.method-b-badge {
  background: rgba(0, 255, 204, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 255, 204, 0.4);
  box-shadow: 0 0 10px var(--accent-cyan-glow);
}

.canvas-body {
  position: relative;
  width: 100%;
  height: 480px;
  background: #03050B;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Metric HUD Cards */
.hud-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 992px) {
  .hud-grid {
    grid-template-columns: 1fr;
  }
}

.metric-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.25rem;
}

.highlight-card {
  border-color: var(--border-highlight);
  box-shadow: 0 0 20px rgba(0, 255, 204, 0.08);
}

.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.fps-badge {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
}

.fps-good {
  background: rgba(0, 255, 136, 0.15);
  color: var(--accent-emerald);
}

.fps-warning {
  background: rgba(255, 184, 0, 0.15);
  color: var(--accent-amber);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.metric-item {
  display: flex;
  flex-direction: column;
  background: rgba(0, 0, 0, 0.25);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
}

.metric-item .label {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.metric-item .value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
}

.val-good {
  color: var(--accent-cyan);
}

.val-bad {
  color: var(--accent-red);
}

/* Summary Comparison Table */
.summary-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.summary-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #FFF;
}

.summary-table {
  width: 100%;
  border-collapse: collapse;
}

.summary-table th, .summary-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
}

.summary-table th {
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
}

.pill {
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 12px;
  font-weight: 600;
}

.pill-green {
  background: rgba(0, 255, 136, 0.15);
  color: var(--accent-emerald);
}

.pill-blue {
  background: rgba(0, 255, 204, 0.15);
  color: var(--accent-cyan);
}

.pill-purple {
  background: rgba(138, 43, 226, 0.15);
  color: var(--accent-purple);
}

.text-neon {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-weight: 600;
}

/* BEX Code Editor */
.editor-section {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-highlight);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.preset-container {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.preset-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.preset-btn:hover {
  background: rgba(0, 255, 204, 0.1);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.editor-textarea {
  width: 100%;
  height: 100px;
  background: #03050B;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.75rem 1rem;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s ease;
}

.editor-textarea:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan-glow);
}

.status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.75rem;
  font-size: 0.8rem;
}

.status-badge {
  padding: 4px 10px;
  border-radius: 6px;
  font-weight: 500;
}

.status-success {
  background: rgba(0, 255, 136, 0.15);
  color: var(--accent-emerald);
}

.status-error {
  background: rgba(255, 51, 102, 0.15);
  color: var(--accent-red);
}

/* SDS Document Viewer Tab */
.doc-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  line-height: 1.7;
}

.doc-card h2 {
  color: var(--accent-cyan);
  margin-bottom: 1rem;
}

.doc-card h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: #FFF;
}

.doc-code-block {
  background: #03050B;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  overflow-x: auto;
  margin: 1rem 0;
}

/* Feedback & Contact Form Styling */
.feedback-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1rem;
}

.form-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.form-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 250px;
}

.form-input {
  background: #03050B;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.65rem 1rem;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.form-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan-glow);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #000;
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 10px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 0 16px var(--accent-cyan-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 24px var(--accent-cyan-glow);
}

.rating-stars {
  display: flex;
  gap: 0.25rem;
  font-size: 1.25rem;
  cursor: pointer;
}

.rating-stars .star {
  color: var(--text-dim);
  transition: color 0.2s ease;
}

.rating-stars .star.active {
  color: var(--accent-amber);
}