:root {
  --primary: #06B6D4;
  --secondary: #8B5CF6;
  --background: #0B0F1A;
  --card-bg: rgba(20, 30, 50, 0.85);
  --text: #E2E8F0;
  --border: rgba(255, 255, 255, 0.15);
  --accent: #10B981;
  --danger: #EF4444;
  --glow: #06B6D4;
}

.light {
  --background: #F1F5F9;
  --card-bg: rgba(255, 255, 255, 0.9);
  --text: #0F172A;
  --border: rgba(0, 0, 0, 0.15);
  --glow: #1E40AF;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Exo 2', sans-serif;
}

body {
  background: var(--background);
  color: var(--text);
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background 0.3s ease;
}

.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.sidebar {
  width: 280px;
  background: var(--card-bg);
  padding: 2rem 1.5rem;
  backdrop-filter: blur(15px);
  border-right: 1px solid var(--border);
  position: fixed;
  top: 0;
  bottom: 0;
  transition: transform 0.3s ease;
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
}

.sidebar .logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  font-size: 1.8rem;
  font-weight: 700;
  text-transform: uppercase;
  background: linear-gradient(45deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tab {
  padding: 0.85rem 1.25rem;
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  border-radius: 0.5rem;
  font-size: 0.95rem;
  color: var(--text);
  position: relative;
  transition: background 0.2s ease, transform 0.2s ease;
}

.tab.active, .tab:hover {
  background: linear-gradient(45deg, var(--primary), var(--secondary));
  color: #fff;
  transform: translateX(5px);
  box-shadow: 0 0 10px var(--glow);
}

.tab::before {
  content: '';
  position: absolute;
  top: 0;
  left: -10px;
  width: 4px;
  height: 100%;
  background: var(--primary);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.tab.active::before, .tab:hover::before {
  opacity: 1;
}

.main-content {
  flex: 1;
  margin-left: 280px;
  padding: 2rem;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.75rem;
  color: var(--text);
  cursor: pointer;
}

.btn {
  padding: 0.6rem 1.25rem;
  border-radius: 0.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(45deg, var(--primary), var(--secondary));
  color: #fff;
  border: none;
}

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

.btn-danger {
  background: var(--danger);
  color: #fff;
  border: none;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 15px var(--glow);
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.3s ease, height 0.3s ease;
}

.btn:active::after {
  width: 200px;
  height: 200px;
}

.card {
  background: var(--card-bg);
  border-radius: 1rem;
  padding: 2rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(15px);
  border: 1px solid var(--border);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
}

.card h2 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  background: linear-gradient(45deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
}

.dashboard-item {
  text-align: center;
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: 0.75rem;
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.15);
  transition: transform 0.2s ease;
}

.dashboard-item:hover {
  transform: scale(1.05);
}

.form-group {
  margin-bottom: 2rem;
}

.form-control {
  width: 100%;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--card-bg);
  color: var(--text);
  font-size: 0.9rem;
  transition: border-color 0.2s ease;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 8px var(--glow);
}

.form-range {
  width: 100%;
  accent-color: var(--primary);
}

.password-display {
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: 0.75rem;
  font-size: 1.4rem;
  text-align: center;
  margin-bottom: 1.5rem;
  word-break: break-all;
  box-shadow: inset 0 0 10px rgba(6, 182, 212, 0.2);
}

.password-options {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.strength-meter {
  height: 12px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  overflow: hidden;
  margin: 0.75rem 0;
}

.strength-bar {
  height: 100%;
  transition: width 0.3s ease, background 0.3s ease;
}

.strength-info {
  font-size: 0.85rem;
  color: var(--text);
}

.btn-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.vault-controls {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

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

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

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 1rem;
  max-width: 600px;
  width: 90%;
  box-shadow: 0 0 30px var(--glow);
  animation: slideIn 0.3s ease;
}

.notification {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  padding: 1.25rem;
  background: var(--accent);
  color: #fff;
  border-radius: 0.5rem;
  box-shadow: 0 0 15px var(--glow);
  animation: fadeIn 0.3s ease;
  max-width: 350px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.notification.error {
  background: var(--danger);
}

.notification::before {
  content: '✅';
  font-size: 1.2rem;
}

.notification.error::before {
  content: '❌';
}

@keyframes slideIn {
  from { transform: translateY(-50px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    transform: translateX(-100%);
    z-index: 1000;
  }
  .sidebar.active {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
    padding: 1.5rem;
  }
  .menu-toggle {
    display: block;
  }
}