:root {
  --primary-color: #4361ee;
  --secondary-color: #3f37c9;
  --success-color: #4cc9f0;
  --info-color: #4895ef;
  --warning-color: #f72585;
  --danger-color: #ef233c;
  --light-color: #f8f9fa;
  --dark-color: #2b2b2b;
  --sidebar-width: 260px;
  --sidebar-bg: #ffffff;
  --sidebar-color: #555555;
  --body-bg: #f4f7fe;
  --card-radius: 16px;
}

body {
  background-color: var(--body-bg);
  font-family: 'Inter', sans-serif;
  color: var(--dark-color);
  overflow-x: hidden;
}

a {
  text-decoration: none;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  background-color: var(--sidebar-bg);
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
  z-index: 1040;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  overflow-y: auto;
}

.sidebar::-webkit-scrollbar {
  width: 6px;
}

.sidebar::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.1);
  border-radius: 10px;
}

.sidebar .brand {
  height: 80px;
  display: flex;
  align-items: center;
  padding: 0 28px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary-color);
  border-bottom: 1px solid rgba(0,0,0,0.04);
  margin-bottom: 15px;
}

.sidebar .nav-item {
  margin-bottom: 8px;
}

.sidebar .nav-link {
  color: var(--sidebar-color);
  padding: 12px 28px;
  display: flex;
  align-items: center;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.3s;
  border-radius: 0 30px 30px 0;
  margin-right: 20px;
  position: relative;
}

.sidebar .nav-link i {
  margin-right: 12px;
  font-size: 1.15rem;
  width: 25px;
  text-align: center;
  color: #929292;
  transition: all 0.3s;
}

.sidebar .nav-link:hover {
  color: var(--primary-color);
  background-color: rgba(67, 97, 238, 0.05);
}

.sidebar .nav-link:hover i {
  color: var(--primary-color);
}

.sidebar .nav-link.active {
  background-color: var(--primary-color);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
}

.sidebar .nav-link.active i {
  color: #ffffff;
}

/* Submenu */
.sidebar .submenu {
  list-style: none;
  padding-left: 0;
  margin-top: 5px;
}

.sidebar .submenu .nav-link {
  padding: 10px 20px 10px 65px;
  font-size: 0.9rem;
  font-weight: 500;
  color: #777;
}

.sidebar .submenu .nav-link:hover {
  color: var(--primary-color);
  background-color: transparent;
}

.sidebar .submenu .nav-link.active {
  color: var(--primary-color);
  background-color: transparent;
  box-shadow: none;
  font-weight: 700;
}

.sidebar .submenu .nav-link.active::before {
  content: "";
  position: absolute;
  left: 45px;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--primary-color);
}

.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0,0,0,0.4);
  z-index: 1030;
  display: none;
  opacity: 0;
  transition: opacity 0.3s;
}

/* Main Content */
.main-content {
  margin-left: var(--sidebar-width);
  padding: 25px 35px;
  min-height: 100vh;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* Topbar */
.topbar {
  height: 75px;
  background-color: #ffffff;
  border-radius: var(--card-radius);
  padding: 0 25px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.03);
}

.navbar-toggler-btn {
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--dark-color);
  cursor: pointer;
  padding: 5px 10px;
  border-radius: 8px;
  transition: background 0.3s;
}

.navbar-toggler-btn:hover {
  background-color: #f0f0f0;
}

/* Cards */
.card {
  border: none;
  border-radius: var(--card-radius);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.04);
  margin-bottom: 30px;
  transition: box-shadow 0.3s, transform 0.3s;
}

.card:hover {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.card-header {
  background-color: transparent;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  padding: 20px 25px;
  border-radius: var(--card-radius) var(--card-radius) 0 0 !important;
}

.card-header h5 {
  font-weight: 600;
  color: var(--dark-color);
}

.card-body {
  padding: 25px;
}

.stat-card .icon-box {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 15px;
  background-color: rgba(255,255,255,0.2);
}

/* Auth Pages */
.auth-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f4f7fe 0%, #e0e8ff 100%);
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 440px;
  border-radius: 20px;
  border: none;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  background-color: #fff;
}

.auth-header {
  text-align: center;
  padding: 45px 35px 20px;
}

.auth-header h3 {
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.auth-body {
  padding: 10px 35px 45px;
}

.auth-form .form-control {
  border-radius: 0 10px 10px 0;
  padding: 14px 16px;
  background-color: #f8f9fa;
  border: 1px solid #ebedf2;
}

.auth-form .input-group-text {
  border-radius: 10px 0 0 10px;
  background-color: #f8f9fa;
  border: 1px solid #ebedf2;
  border-right: none;
  padding: 0 16px;
}

.auth-form .form-control:focus {
  border-color: var(--primary-color);
  box-shadow: none;
  background-color: #fff;
}

.auth-form .form-control:focus + .input-group-text,
.auth-form .input-group:focus-within .input-group-text {
  border-color: var(--primary-color);
  background-color: #fff;
}

/* Buttons */
.btn-primary {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(67, 97, 238, 0.2);
  transition: all 0.3s;
}

.btn-primary:hover, .btn-primary:focus {
  background-color: var(--secondary-color);
  border-color: var(--secondary-color);
  box-shadow: 0 6px 20px rgba(67, 97, 238, 0.3);
  transform: translateY(-2px);
}

/* Tables */
.table {
  color: var(--dark-color);
}
.table > :not(caption) > * > * {
  padding: 15px 20px;
  border-bottom-color: rgba(0,0,0,0.03);
}
.table-hover > tbody > tr:hover > * {
  background-color: rgba(67, 97, 238, 0.04);
}
.table thead th {
  font-weight: 600;
  color: #777;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
  border-bottom: 2px solid rgba(0,0,0,0.05);
}

.table code {
  background-color: rgba(67, 97, 238, 0.1);
  color: var(--primary-color);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.table code:hover {
  background-color: var(--primary-color);
  color: #fff;
}

/* Forms */
.form-label {
  font-weight: 600;
  color: #555;
  margin-bottom: 8px;
}

.form-control {
  border-radius: 10px;
  padding: 12px 16px;
  border: 1px solid #e4e6ef;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.25rem rgba(67, 97, 238, 0.15);
}

/* Responsive */
@media (max-width: 991.98px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.show {
    transform: translateX(0);
  }
  .sidebar-overlay.show {
    display: block;
    opacity: 1;
  }
  .main-content {
    margin-left: 0;
    padding: 15px 20px;
  }
}