/* ================================================================
  MODERN & ELEGANT UI IMPROVEMENTS
  Updated: 2024
  Purpose: Enhance overall UI/UX with modern design principles
================================================================ */

* {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

/* ======================= GLOBAL STYLES ======================= */
:root {
  --primary: #667eea;
  --primary-dark: #764ba2;
  --primary-light: #f093fb;
  --secondary: #3abaf4;
  --success: #47c363;
  --warning: #ffa426;
  --danger: #fc544b;
  --dark: #191d21;
  --light: #e3eaef;
  --white: #ffffff;
  --text-primary: #2d3748;
  --text-secondary: #718096;
  --bg-light: #f8f9ff;
  --border-color: #e8eaf6;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --scrollbar-size-desktop: 10px;
  --scrollbar-size-mobile: 6px;
  --scrollbar-track: #edf1ff;
  --scrollbar-thumb: #667eea;
  --scrollbar-thumb-dark: #5a67d8;
}

body {
  background: linear-gradient(135deg, #f8f9ff 0%, #f0f3ff 100%);
  color: var(--text-primary);
  font-family: 'Poppins', 'Nunito', sans-serif;
  font-weight: 400;
  line-height: 1.6;
}

/* ======================= NAVBAR/HEADER ======================= */
.navbar-bg {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, var(--primary-light) 100%);
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.25);
  height: 65px;
}

.main-navbar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, var(--primary-light) 100%);
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.25);
  padding: 12px 30px;
  border: none;
  top: 0;
  height: 65px;
}

.main-navbar .navbar-nav .nav-link {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  margin: 0 8px;
  transition: var(--transition);
  border-radius: 6px;
  padding: 8px 12px;
}

.main-navbar .navbar-nav .nav-link:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--white);
  transform: translateY(-2px);
}

.main-navbar .navbar-nav .nav-link-user {
  color: var(--white);
  font-size: 14px;
  font-weight: 600;
}

.main-navbar .navbar-nav .nav-link-user img {
  border: 2px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.main-navbar .dropdown-menu {
  border: none;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  border-radius: 12px;
  margin-top: 12px;
}

.main-navbar .dropdown-menu .dropdown-item {
  padding: 12px 20px;
  font-weight: 500;
  transition: var(--transition);
}

.main-navbar .dropdown-menu .dropdown-item:hover {
  background: var(--bg-light);
  color: var(--primary);
  padding-left: 25px;
}

/* ======================= SIDEBAR ======================= */
.main-sidebar {
  background: linear-gradient(180deg, var(--white) 0%, var(--bg-light) 50%, var(--white) 100%);
  box-shadow: 4px 0 25px rgba(102, 126, 234, 0.1);
  border-right: 1px solid var(--border-color);
}

#sidebar-wrapper {
  background: linear-gradient(180deg, var(--white) 0%, var(--bg-light) 50%, var(--white) 100%);
}

.sidebar-brand {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, var(--primary-light) 100%);
  padding: 28px 20px;
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.25);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  animation: brandGlow 3s ease-in-out infinite;
}

@keyframes brandGlow {
  0%, 100% { 
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.25);
  }
  50% { 
    box-shadow: 0 4px 30px rgba(118, 75, 162, 0.4);
  }
}

.sidebar-brand a {
  color: var(--white) !important;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
}

.sidebar-brand-sm a {
  font-size: 24px;
}

.sidebar-menu {
  padding: 25px 0;
}

.sidebar-menu .menu-header {
  padding: 15px 25px 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1.8px;
  margin-top: 15px;
  border-left: 4px solid var(--primary);
  background: linear-gradient(90deg, rgba(102, 126, 234, 0.08) 0%, transparent 100%);
}

.sidebar-menu .menu-header i {
  margin-right: 8px;
  font-size: 12px;
  color: var(--primary-dark);
}

.sidebar-menu li a {
  padding: 14px 25px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  border-left: 4px solid transparent;
  position: relative;
  overflow: hidden;
  margin: 3px 0;
}

.sidebar-menu li a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, rgba(102, 126, 234, 0.12) 0%, rgba(240, 147, 251, 0.08) 100%);
  transition: var(--transition);
  z-index: 0;
}

.sidebar-menu li a::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 6px 0 6px 8px;
  border-color: transparent transparent transparent var(--primary);
  opacity: 0;
  transition: all 0.3s ease;
}

.sidebar-menu li a:hover::before {
  width: 100%;
}

.sidebar-menu li a:hover::after {
  opacity: 1;
  right: 15px;
}

.sidebar-menu li a:hover {
  color: var(--primary);
  background: linear-gradient(90deg, rgba(102, 126, 234, 0.1) 0%, rgba(240, 147, 251, 0.05) 100%);
  border-left-color: var(--primary);
  padding-left: 32px;
  box-shadow: inset 0 0 20px rgba(102, 126, 234, 0.08);
  transform: translateX(2px);
}

.sidebar-menu li a.active,
.sidebar-menu li.active > a {
  background: linear-gradient(90deg, rgba(102, 126, 234, 0.15) 0%, rgba(240, 147, 251, 0.1) 100%);
  color: var(--primary);
  border-left-color: var(--primary);
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.15), inset 0 0 20px rgba(102, 126, 234, 0.08);
}

.sidebar-menu li a i {
  width: 35px;
  margin-right: 12px;
  font-size: 16px;
  text-align: center;
  transition: var(--transition);
}

.sidebar-menu li a:hover i {
  color: var(--primary);
  transform: scale(1.2) rotate(5deg);
}

.sidebar-menu li.active > a i {
  color: var(--primary);
  transform: scale(1.1);
}

/* ======================= CARDS ======================= */
.card {
  border: none;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  background: var(--white);
  overflow: hidden;
  margin-bottom: 24px;
}

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

.card-header {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(240, 147, 251, 0.04) 100%);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 24px;
  border: none;
}

.card-header h4 {
  color: var(--primary);
  font-weight: 700;
  font-size: 18px;
  margin: 0;
}

.card-body {
  padding: 24px;
  color: var(--text-primary);
}

.card-title {
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 15px;
}

/* ======================= TABLES ======================= */
.table {
  border-collapse: separate;
  border-spacing: 0;
  margin-bottom: 0;
}

.table thead th {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 13px;
  letter-spacing: 0.5px;
  padding: 16px 12px;
  border: none;
  border-bottom: 2px solid rgba(0, 0, 0, 0.1);
  text-align: left;
}

.table tbody tr {
  transition: var(--transition);
  border-bottom: 1px solid var(--border-color);
}

.table tbody tr:hover {
  background: linear-gradient(90deg, rgba(102, 126, 234, 0.04) 0%, rgba(240, 147, 251, 0.02) 100%);
  box-shadow: inset 0 0 15px rgba(102, 126, 234, 0.08);
  transform: scale(1.01);
  transform-origin: center;
}

.table tbody tr:last-child {
  border-bottom: 2px solid var(--border-color);
}

.table tbody td {
  padding: 16px 12px;
  vertical-align: middle;
  color: var(--text-primary);
  font-weight: 500;
}

.table-striped tbody tr:nth-of-type(odd) {
  background: linear-gradient(90deg, rgba(240, 147, 251, 0.02) 0%, rgba(102, 126, 234, 0.01) 100%);
}

.table-responsive {
  border-radius: 12px;
  overflow: hidden;
}

/* ======================= BUTTONS ======================= */
.btn {
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 13px;
  padding: 10px 18px;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--white);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--secondary);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(58, 186, 244, 0.3);
}

.btn-secondary:hover {
  background: linear-gradient(135deg, var(--secondary) 0%, #2da8dd 100%);
  color: var(--white);
  box-shadow: 0 6px 20px rgba(58, 186, 244, 0.4);
  transform: translateY(-2px);
}

.btn-success {
  background: var(--success);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(71, 195, 99, 0.3);
}

.btn-success:hover {
  background: linear-gradient(135deg, var(--success) 0%, #3ba450 100%);
  color: var(--white);
  box-shadow: 0 6px 20px rgba(71, 195, 99, 0.4);
  transform: translateY(-2px);
}

.btn-warning {
  background: var(--warning);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(255, 164, 38, 0.3);
}

.btn-warning:hover {
  background: linear-gradient(135deg, var(--warning) 0%, #ff9500 100%);
  color: var(--white);
  box-shadow: 0 6px 20px rgba(255, 164, 38, 0.4);
  transform: translateY(-2px);
}

.btn-danger {
  background: var(--danger);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(252, 84, 75, 0.3);
}

.btn-danger:hover {
  background: linear-gradient(135deg, var(--danger) 0%, #fb3a2a 100%);
  color: var(--white);
  box-shadow: 0 6px 20px rgba(252, 84, 75, 0.4);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 14px;
  font-size: 12px;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 14px;
}

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

/* ======================= FORMS ======================= */
.form-control,
.input-group-text,
.custom-select {
  background-color: var(--white);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  height: 44px;
  transition: var(--transition);
  font-family: 'Poppins', 'Nunito', sans-serif;
}

.form-control:focus,
.input-group-text:focus,
.custom-select:focus {
  background-color: var(--white);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  outline: none;
}

.form-control::placeholder {
  color: var(--text-secondary);
}

.custom-select {
  padding: 10px 16px;
  cursor: pointer;
}

textarea.form-control {
  height: 100px;
  resize: vertical;
  padding: 12px 16px;
}

/* ======================= BADGES ======================= */
.badge {
  padding: 6px 14px;
  font-weight: 600;
  border-radius: 20px;
  font-size: 12px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.badge-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
}

.badge-success {
  background: linear-gradient(135deg, var(--success) 0%, #3ba450 100%);
  color: var(--white);
}

.badge-warning {
  background: linear-gradient(135deg, var(--warning) 0%, #ff9500 100%);
  color: var(--white);
}

.badge-danger {
  background: linear-gradient(135deg, var(--danger) 0%, #fb3a2a 100%);
  color: var(--white);
}

/* ======================= SECTION ======================= */
.section {
  padding: 32px 24px;
}

.section-header {
  margin-bottom: 30px;
}

.section-header h1 {
  color: var(--primary);
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 10px;
}

.section-header-breadcrumb {
  display: flex;
  gap: 10px;
}

.breadcrumb-item {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.breadcrumb-item a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

.breadcrumb-item a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.breadcrumb-item.active {
  color: var(--text-primary);
  font-weight: 600;
}

/* ======================= ALERTS ======================= */
.alert {
  border: none;
  border-radius: 8px;
  padding: 16px 20px;
  border-left: 4px solid;
  font-weight: 500;
}

.alert-primary {
  background: rgba(102, 126, 234, 0.1);
  color: var(--primary);
  border-left-color: var(--primary);
}

.alert-success {
  background: rgba(71, 195, 99, 0.1);
  color: var(--success);
  border-left-color: var(--success);
}

.alert-warning {
  background: rgba(255, 164, 38, 0.1);
  color: var(--warning);
  border-left-color: var(--warning);
}

.alert-danger {
  background: rgba(252, 84, 75, 0.1);
  color: var(--danger);
  border-left-color: var(--danger);
}

/* ======================= MODALS ======================= */
.modal-content {
  border: none;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.modal-header {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(240, 147, 251, 0.04) 100%);
  border-bottom: 1px solid var(--border-color);
  border-radius: 12px 12px 0 0;
  padding: 20px 24px;
}

.modal-header .modal-title {
  color: var(--primary);
  font-weight: 700;
  font-size: 18px;
}

.modal-body {
  padding: 24px;
}

.modal-footer {
  border-top: 1px solid var(--border-color);
  padding: 16px 24px;
  background: var(--bg-light);
  border-radius: 0 0 12px 12px;
}

/* ======================= PAGINATION ======================= */
.pagination .page-link {
  border: none;
  background: var(--white);
  color: var(--primary);
  font-weight: 600;
  border-radius: 6px;
  padding: 8px 12px;
  margin: 0 4px;
  transition: var(--transition);
}

.pagination .page-link:hover {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.pagination .page-item.active .page-link {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* ======================= BREADCRUMB ======================= */
.breadcrumb {
  background: transparent;
  padding: 0;
  margin-bottom: 0;
}

.breadcrumb .breadcrumb-item + .breadcrumb-item::before {
  content: '›';
  margin: 0 8px;
  color: var(--text-secondary);
}

/* ======================= MAIN CONTENT ======================= */
.main-content {
  background: linear-gradient(135deg, #f8f9ff 0%, #f0f3ff 100%);
  min-height: calc(100vh - 65px);
}

.main-wrapper {
  background: linear-gradient(135deg, #f8f9ff 0%, #f0f3ff 100%);
}

/* ======================= RESPONSIVE ======================= */
@media (max-width: 576px) {
  .sidebar-brand a {
    font-size: 14px;
  }

  .section {
    padding: 16px 12px;
  }

  .section-header h1 {
    font-size: 22px;
  }

  .card-body {
    padding: 16px;
  }

  .table {
    font-size: 12px;
  }

  .btn {
    padding: 8px 12px;
    font-size: 12px;
  }

  .main-navbar {
    padding: 12px 16px;
  }
}

/* ======================= ANIMATIONS ======================= */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.card {
  animation: slideIn 0.4s ease-out;
}

.alert {
  animation: slideIn 0.3s ease-out;
}

/* ======================= UTILITIES ======================= */
.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.bg-gradient-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%) !important;
}

.bg-gradient-success {
  background: linear-gradient(135deg, var(--success) 0%, #3ba450 100%) !important;
}

.border-primary {
  border-color: var(--primary) !important;
}

.shadow-sm {
  box-shadow: var(--shadow-sm) !important;
}

.shadow-md {
  box-shadow: var(--shadow-md) !important;
}

.shadow-lg {
  box-shadow: var(--shadow-lg) !important;
}

/* ======================= INPUT GROUP ======================= */
.input-group-btn .btn {
  border-radius: 0 8px 8px 0;
}

.input-group:has(.btn) .form-control {
  border-radius: 8px 0 0 8px;
}

/* ======================= CUSTOM SCROLLBAR ======================= */
html {
  scrollbar-gutter: stable both-edges;
}

body,
.main-sidebar,
.table-responsive,
.modal-body,
.card-body {
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

::-webkit-scrollbar {
  width: var(--scrollbar-size-desktop);
  height: var(--scrollbar-size-desktop);
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--scrollbar-thumb) 0%, var(--scrollbar-thumb-dark) 100%);
  border: 2px solid var(--scrollbar-track);
  border-radius: 10px;
  transition: background 0.2s ease, border-color 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--scrollbar-thumb-dark) 0%, var(--scrollbar-thumb) 100%);
}

@media (max-width: 768px) {
  ::-webkit-scrollbar {
    width: var(--scrollbar-size-mobile);
    height: var(--scrollbar-size-mobile);
  }

  ::-webkit-scrollbar-thumb {
    border-width: 1px;
  }
}