:root {
  --primary: #00ffa3;
  --primary-dark: #00d689;
  --bg-dark: #0a0a0c;
  --bg-card: #16161a;
  --bg-input: #1f1f25;
  --text-main: #ffffff;
  --text-dim: #94a3b8;
  --border: rgba(255, 255, 255, 0.1);
  --accent-gradient: linear-gradient(135deg, #00ffa3 0%, #00bcff 100%);
  --glass: rgba(255, 255, 255, 0.03);
  
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-2xl: 80px;
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.5;
  overflow-x: hidden;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
}

p { margin: 0; }

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

.sidebar {
  width: 280px;
  border-right: 1px solid var(--border);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  background: var(--bg-dark);
}

.main-content {
  flex: 1;
  padding: var(--space-lg) clamp(var(--space-lg), 5vw, var(--space-2xl));
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: var(--space-sm) var(--space-lg);
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
}

@media (max-width: 768px) {
  .sidebar { display: none; }
  .mobile-nav { display: flex; }
  .main-content { 
    padding-bottom: 80px;
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
}

.mobile-nav-item.active {
  color: var(--primary);
}

/* Groups List */
.groups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.group-card {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: var(--space-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: all 0.2s;
}

.group-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.group-icon-circle {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--glass);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: var(--space-xs);
}

.group-member-count {
  font-size: 0.815rem;
  color: var(--text-dim);
}

.fab {
  position: fixed;
  bottom: 100px;
  right: var(--space-lg);
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(0, 255, 163, 0.3);
  color: #000;
  z-index: 900;
}

/* Components */
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-2xl);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-dim);
  font-weight: 500;
}

.nav-item:hover, .nav-item.active {
  background: var(--glass);
  color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform 0.2s, filter 0.2s;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--accent-gradient);
  color: #000;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-main);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  overflow: hidden;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: var(--primary);
}

/* Specific UI */
.scanner-preview {
  aspect-ratio: 1;
  background: #000;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  border: 2px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.scanner-overlay {
  position: absolute;
  inset: 40px;
  border: 2px solid var(--primary);
  border-radius: var(--radius-md);
  box-shadow: 0 0 0 100vmax rgba(0,0,0,0.5);
}

.scanner-line {
  position: absolute;
  top: 40px;
  left: 40px;
  right: 40px;
  height: 2px;
  background: var(--primary);
  box-shadow: 0 0 15px var(--primary);
  animation: scan 2s ease-in-out infinite;
}

@keyframes scan {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(calc(100% + 240px)); }
}

.placeholder-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.badge {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  background: var(--glass);
  color: var(--primary);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--text-dim);
  font-size: 0.875rem;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-main);
  outline: none;
}

.form-input:focus {
  border-color: var(--primary);
}

.group-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px 10px;
  background: var(--glass);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.group-selector {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.group-option {
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.group-option:hover {
  border-color: var(--primary);
  background: var(--glass);
}

.group-option.selected {
  border-color: var(--primary);
  background: rgba(0, 255, 163, 0.1);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: var(--space-lg);
}

.modal {
  background: var(--bg-card);
  width: 100%;
  max-width: 500px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: var(--space-xl);
  position: relative;
}

/* Utility */
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; align-items: center; gap: var(--space-md); }
.mt-xl { margin-top: var(--space-xl); }
.text-dim { color: var(--text-dim); }