/* ============================================
   IPS - Indoor Positioning System Prototypes
   Shared Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* --- CSS Custom Properties --- */
:root {
  /* Color Palette - Dark Cyberpunk Theme */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a2035;
  --bg-card-hover: #1f2847;
  --bg-glass: rgba(26, 32, 53, 0.85);
  --bg-overlay: rgba(10, 14, 26, 0.9);

  --text-primary: #e8ecf4;
  --text-secondary: #8b95a8;
  --text-muted: #5a6478;
  --text-accent: #64d2ff;

  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-yellow: #f59e0b;
  --accent-orange: #f97316;
  --accent-red: #ef4444;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;

  --gradient-blue: linear-gradient(135deg, #3b82f6, #06b6d4);
  --gradient-green: linear-gradient(135deg, #10b981, #06b6d4);
  --gradient-purple: linear-gradient(135deg, #8b5cf6, #ec4899);
  --gradient-orange: linear-gradient(135deg, #f97316, #f59e0b);
  --gradient-red: linear-gradient(135deg, #ef4444, #f97316);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);

  /* Borders */
  --border-color: rgba(59, 130, 246, 0.15);
  --border-glow: rgba(59, 130, 246, 0.3);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow-blue: 0 0 20px rgba(59, 130, 246, 0.2);
  --shadow-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.2);

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

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Canvas dimensions */
  --canvas-max-width: 900px;
  --canvas-height: 500px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
  background: var(--accent-blue);
  border-radius: 3px;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--accent-blue);
}

code, .mono {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
}

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Header --- */
.site-header {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--text-primary);
  text-decoration: none;
}

.header-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-blue);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

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

.nav-link {
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: rgba(59, 130, 246, 0.1);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.back-link:hover {
  color: var(--text-primary);
  background: rgba(59, 130, 246, 0.1);
}

/* --- Proto Page Layout --- */
.proto-page {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-xl) 0;
}

.proto-title {
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.proto-title .badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-wifi { background: rgba(59, 130, 246, 0.2); color: var(--accent-blue); }
.badge-ble { background: rgba(6, 182, 212, 0.2); color: var(--accent-cyan); }
.badge-uwb { background: rgba(139, 92, 246, 0.2); color: var(--accent-purple); }
.badge-pdr { background: rgba(16, 185, 129, 0.2); color: var(--accent-green); }
.badge-geomag { background: rgba(249, 115, 22, 0.2); color: var(--accent-orange); }
.badge-slam { background: rgba(236, 72, 153, 0.2); color: var(--accent-pink); }
.badge-acoustic { background: rgba(245, 158, 11, 0.2); color: var(--accent-yellow); }
.badge-hybrid { background: rgba(239, 68, 68, 0.2); color: var(--accent-red); }

.proto-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: var(--space-xl);
  max-width: 700px;
}

.proto-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-xl);
  flex: 1;
}

@media (max-width: 960px) {
  .proto-layout {
    grid-template-columns: 1fr;
  }
}

/* --- Canvas Container --- */
.canvas-container {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.canvas-container canvas {
  display: block;
  width: 100%;
  height: auto;
  cursor: crosshair;
}

.canvas-overlay {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.canvas-stat {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 2px 10px;
  background: var(--bg-overlay);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-accent);
  backdrop-filter: blur(8px);
}

/* --- Control Panel --- */
.control-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

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

.panel-section-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

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

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

.control-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.control-value {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: rgba(59, 130, 246, 0.15);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-blue);
  cursor: pointer;
  box-shadow: 0 0 8px rgba(59, 130, 246, 0.4);
  transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-blue);
  color: white;
  box-shadow: var(--shadow-glow-blue);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.2);
}
.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.2);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
  border: 1px solid rgba(239, 68, 68, 0.2);
}
.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 0.78rem;
}

.btn-block {
  width: 100%;
}

.btn-group {
  display: flex;
  gap: var(--space-sm);
}

/* --- Cards (Dashboard) --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.tech-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-slow);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

.tech-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.tech-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.tech-card[data-tech="wifi"]::before { background: var(--gradient-blue); }
.tech-card[data-tech="ble"]::before { background: linear-gradient(90deg, #06b6d4, #3b82f6); }
.tech-card[data-tech="uwb"]::before { background: var(--gradient-purple); }
.tech-card[data-tech="pdr"]::before { background: var(--gradient-green); }
.tech-card[data-tech="geomag"]::before { background: var(--gradient-orange); }
.tech-card[data-tech="slam"]::before { background: linear-gradient(90deg, #ec4899, #8b5cf6); }
.tech-card[data-tech="acoustic"]::before { background: linear-gradient(90deg, #f59e0b, #f97316); }

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: var(--space-md);
}

.card-icon.wifi { background: rgba(59, 130, 246, 0.15); }
.card-icon.ble { background: rgba(6, 182, 212, 0.15); }
.card-icon.uwb { background: rgba(139, 92, 246, 0.15); }
.card-icon.pdr { background: rgba(16, 185, 129, 0.15); }
.card-icon.geomag { background: rgba(249, 115, 22, 0.15); }
.card-icon.slam { background: rgba(236, 72, 153, 0.15); }
.card-icon.acoustic { background: rgba(245, 158, 11, 0.15); }

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
  margin-bottom: var(--space-md);
}

.card-meta {
  display: flex;
  gap: var(--space-md);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.card-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* --- Spec Table --- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.spec-table th {
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.spec-table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid rgba(59, 130, 246, 0.06);
  color: var(--text-secondary);
}

.spec-table tr:hover td {
  background: rgba(59, 130, 246, 0.03);
}

/* --- Info/Legend Box --- */
.info-box {
  background: rgba(59, 130, 246, 0.06);
  border: 1px solid rgba(59, 130, 246, 0.12);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.info-box-title {
  font-weight: 600;
  color: var(--text-accent);
  margin-bottom: var(--space-xs);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- Legend --- */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

/* --- Hero Section (Dashboard) --- */
.hero {
  text-align: center;
  padding: var(--space-3xl) 0 var(--space-2xl);
}

.hero-title {
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, #e8ecf4, #64d2ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* --- Section --- */
.section {
  padding: var(--space-2xl) 0;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --- Radar Chart --- */
.radar-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: var(--space-lg) 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes ping {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(2.5); opacity: 0; }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* --- Signal Rings --- */
.signal-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
  animation: ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
  pointer-events: none;
}

/* --- Tooltip --- */
.tooltip {
  position: absolute;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-overlay);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-accent);
  pointer-events: none;
  white-space: nowrap;
  z-index: 200;
  backdrop-filter: blur(8px);
}

/* --- Utility --- */
.text-center { text-align: center; }
.text-mono { font-family: var(--font-mono); }
.text-accent { color: var(--text-accent); }
.text-muted { color: var(--text-muted); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.gap-sm { gap: var(--space-sm); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-1 { flex: 1; }