:root {
  --primary-color: #4a90e2;
  --secondary-color: #2c3e50;
  --surface-color: #ffffff;
  --surface-alt: #f8f9fa;
  --border-color: #e2e8f0;
  --text-color: #1f2937;
  --text-muted: #6b7280;
  --shadow-light: 0 10px 30px rgba(15, 23, 42, 0.08);
  --gradient-primary: linear-gradient(135deg, #4a90e2 0%, #2c3e50 100%);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, "Helvetica Neue", sans-serif;
  background-color: var(--surface-alt);
  color: var(--text-color);
  text-rendering: optimizeLegibility;
}

img,
svg,
video {
  max-width: 100%;
  height: auto;
}

button,
input,
select,
textarea {
  font: inherit;
  touch-action: manipulation;
}

input,
select,
textarea,
button {
  font-size: 16px;
}

.container,
.container-fluid {
  padding-left: 1rem;
  padding-right: 1rem;
}

.navbar {
  background: var(--gradient-primary) !important;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.navbar-brand,
.navbar-text,
.nav-link {
  color: rgba(255, 255, 255, 0.95) !important;
}

.navbar-brand {
  font-weight: 700;
}

.nav-link {
  transition: color 0.25s ease;
}

.nav-link:hover,
.nav-link.active {
  color: #ffffff !important;
}

.navbar-toggler {
  border-color: rgba(255, 255, 255, 0.2);
}

.navbar-toggler-icon {
  filter: invert(1);
}

.card {
  border: none !important;
  border-radius: 1rem;
  box-shadow: var(--shadow-light);
  background-color: var(--surface-color) !important;
  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-2px);
}

.card-body {
  padding: 1.5rem !important;
}

.card-header,
.card-footer {
  background-color: transparent !important;
  border: none !important;
}

.btn {
  border-radius: 0.85rem !important;
  min-height: 44px;
  padding: 0.75rem 1.25rem;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary,
.btn-danger,
.btn-success,
.btn-warning,
.btn-info {
  border: none !important;
  color: #fff !important;
  box-shadow: 0 12px 24px rgba(74, 144, 226, 0.16);
}

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

.btn-danger {
  background: #dc3545 !important;
}

.btn-outline-primary,
.btn-outline-secondary,
.btn-outline-danger {
  border-radius: 0.85rem !important;
}

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

.btn-outline-primary:hover {
  background: var(--primary-color) !important;
  color: #fff !important;
}

.form-control,
.form-select,
textarea {
  border-radius: 0.85rem !important;
  border: 1px solid var(--border-color) !important;
  background-color: #fff !important;
  box-shadow: none !important;
}

.form-control:focus,
.form-select:focus,
textarea:focus {
  border-color: var(--primary-color) !important;
  box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.15) !important;
}

.form-label {
  font-weight: 600;
  color: var(--text-color);
}

.table {
  border-radius: 1rem;
  overflow: hidden;
  background-color: #fff;
}

.table thead th {
  background-color: #eef2ff;
  border: none;
}

.table tbody tr {
  border-bottom: 1px solid #f1f5f9;
}

.table-responsive {
  overflow-x: auto;
}

.alert {
  border-radius: 1rem;
}

footer {
  background: var(--gradient-primary) !important;
  color: #fff !important;
}

footer a {
  color: #f8fafc !important;
}

.text-muted {
  color: var(--text-muted) !important;
}

@media (max-width: 992px) {
  .container,
  .container-fluid {
    padding-left: 0.75rem;
    padding-right: 0.75rem;
  }

  .navbar-nav {
    text-align: center;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 0.75rem 1rem !important;
  }

  .card {
    margin-bottom: 1.25rem;
  }

  .btn {
    width: 100% !important;
  }

  .table-responsive {
    overflow-x: auto;
  }

  .d-flex.flex-wrap {
    flex-direction: column !important;
  }

  .form-control,
  .form-select,
  textarea {
    width: 100% !important;
  }
}