/* --- CSS Variables & Base Styles --- */
:root {
  --primary-color: #0a59f7;
  --secondary-color: #6c757d;
  --success-color: #34c759;
  --danger-color: #ff3b30;
  --warning-color: #ff9500;
  --info-color: #0a59f7;
  --text-color: #1d1d1f;
  --text-secondary: #86868b;
  --card-bg: rgba(255, 255, 255, 0.82);
  --body-bg-start: #f5f5f7;
  --body-bg-end: #eef1f6;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-pill: 999px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'HarmonyOS Sans', 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  margin: 0;
  padding: 0;
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--body-bg-start), var(--body-bg-end), var(--body-bg-start));
  background-size: 200% 200%;
  animation: animatedGradient 15s ease infinite;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@keyframes animatedGradient {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.main-container {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 20px auto;
  padding: 0 20px;
}

/* --- Navbar --- */
.navbar {
  background: rgba(255, 255, 255, 0.72) !important;
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
  border-bottom: none;
  padding: 10px 25px;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar-brand {
  font-weight: 600;
  color: var(--text-color) !important;
  font-size: 1.05rem;
  letter-spacing: -0.2px;
}

/* --- Cards --- */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(0, 0, 0, 0.04);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  background-color: transparent;
  color: var(--text-color);
  font-weight: 600;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-md) var(--radius-md) 0 0 !important;
  padding: 16px 20px;
}

.card-title {
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 8px;
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.5;
}

/* --- Forms --- */
.form-control,
.form-select {
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 0, 0, 0.1);
  background-color: rgba(255, 255, 255, 0.8);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  padding: 10px 14px;
  font-size: 0.95rem;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(10, 89, 247, 0.1);
  background-color: #fff;
}

.form-label {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-color);
  margin-bottom: 6px;
}

.form-text {
  color: var(--text-secondary);
  font-size: 0.82rem;
}

/* --- Buttons --- */
.btn {
  border-radius: var(--radius-pill);
  font-weight: 500;
  padding: 8px 20px;
  border: none;
  font-size: 0.9rem;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #fff;
}

.btn-primary:hover {
  background-color: #084ac8;
  color: #fff;
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: #fff;
}

.btn-secondary:hover {
  background-color: #5a6268;
  color: #fff;
}

.btn-outline-primary {
  border: 1.5px solid var(--primary-color);
  color: var(--primary-color);
  background: transparent;
}

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

.btn-outline-danger {
  border: 1.5px solid var(--danger-color);
  color: var(--danger-color);
  background: transparent;
}

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

.btn-lg {
  padding: 12px 28px;
  font-size: 1rem;
}

.btn-sm {
  padding: 5px 14px;
  font-size: 0.82rem;
}

/* --- Tables --- */
.table {
  background-color: var(--card-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table thead {
  background-color: rgba(0, 0, 0, 0.02);
}

.table th {
  color: var(--text-color);
  font-weight: 600;
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.table td {
  color: var(--text-color);
  font-size: 0.92rem;
  vertical-align: middle;
}

.table-striped > tbody > tr:nth-of-type(odd) > * {
  background-color: rgba(0, 0, 0, 0.015);
}

/* --- Alerts (Flash Messages) --- */
.alert {
  border-radius: var(--radius-sm);
  border: none;
  box-shadow: var(--shadow-sm);
  font-size: 0.92rem;
  padding: 14px 18px;
  border-left: 4px solid transparent;
}

.alert-success {
  background-color: rgba(52, 199, 89, 0.1);
  color: #1a7a34;
  border-left-color: var(--success-color);
}

.alert-danger {
  background-color: rgba(255, 59, 48, 0.1);
  color: #c0291f;
  border-left-color: var(--danger-color);
}

.alert-warning {
  background-color: rgba(255, 149, 0, 0.1);
  color: #8a5100;
  border-left-color: var(--warning-color);
}

.alert-info {
  background-color: rgba(10, 89, 247, 0.06);
  color: var(--primary-color);
  border-left-color: var(--primary-color);
}

/* --- Badges --- */
.badge {
  font-weight: 500;
  font-size: 0.72rem;
  padding: 4px 8px;
  border-radius: var(--radius-pill);
}

/* --- List Group --- */
.list-group-item {
  border-color: rgba(0, 0, 0, 0.06);
  padding: 16px 20px;
}

.list-group-item:first-child {
  border-top-left-radius: var(--radius-md);
  border-top-right-radius: var(--radius-md);
}

.list-group-item:last-child {
  border-bottom-left-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

/* --- Page Headers --- */
.display-5 {
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-color);
}

.lead {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* --- Links --- */
a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #084ac8;
}

/* --- Code --- */
code {
  background: rgba(0, 0, 0, 0.04);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--text-color);
}

/* --- Footer --- */
footer {
  text-align: center;
  padding: 24px 20px;
  margin-top: 40px;
  color: var(--text-secondary);
  font-size: 0.82rem;
  border-top: 1px solid rgba(0, 0, 0, 0.04);
  background-color: transparent;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .card-body {
    padding: 16px;
  }

  .display-5 {
    font-size: 1.8rem;
  }

  .lead {
    font-size: 0.95rem;
  }
}