/* Design System - Preset B: Light, Blue→Teal gradient, Neumorphism-light, Rounded 12-16, Soft Shadows */
:root {
  --brand-start: #3aa6ff; /* cerulean */
  --brand-end:   #16d1a0; /* teal */
  --brand-600:   #2998f5;
  --brand-700:   #1e7fd2;

  --bg-body:     #f6f9fc;
  --bg-surface:  #ffffff;
  --text-900:    #1f2d3d;
  --text-700:    #3c4b5a;
  --text-500:    #738496;

  --border-200:  #e6eef5;
  --border-300:  #d9e3ec;

  --success-500: #22c55e;
  --info-500:    #0ea5e9;
  --warning-500: #f59e0b;
  --danger-500:  #ef4444;
  --secondary-500:#64748b;

  --radius-md:   12px;
  --radius-lg:   16px;
  --radius-xl:   20px;
  --radius-pill: 999px;

  --shadow-sm:   0 2px 8px rgba(15, 23, 42, 0.08);
  --shadow-md:   0 6px 18px rgba(15, 23, 42, 0.10);
  --shadow-lg:   0 10px 28px rgba(15, 23, 42, 0.12);

  --brand-gradient: linear-gradient(135deg, var(--brand-start) 0%, var(--brand-end) 100%);
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg-body);
  color: var(--text-900);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Links */
a {
  color: var(--brand-600);
  text-decoration: none;
  transition: color .2s ease, opacity .2s ease;
}
a:hover { color: var(--brand-700); }

/* Headings refinement */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-900);
  font-weight: 600;
  letter-spacing: .2px;
}

/* Buttons */
.btn {
  border: 0;
  border-radius: var(--radius-md);
  font-weight: 600;
  letter-spacing: .2px;
  transition: transform .06s ease, box-shadow .2s ease, filter .2s ease, background .2s ease;
  box-shadow: var(--shadow-sm);
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--brand-gradient);
  color: #fff;
  box-shadow: 0 6px 16px rgba(58, 166, 255, .25);
}
.btn-primary:hover {
  filter: brightness(1.03);
  box-shadow: 0 10px 24px rgba(58, 166, 255, .28);
}
.btn-primary:focus, .btn-primary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px rgba(58,166,255,.18);
}

.btn-secondary { background: #edf2f7; color: var(--text-900); }
.btn-secondary:hover { background: #e6eef5; }

.btn-success { background: var(--success-500); color:#fff; }
.btn-info    { background: var(--info-500); color:#fff; }
.btn-warning { background: var(--warning-500); color:#fff; }
.btn-danger  { background: var(--danger-500); color:#fff; }

.btn-sm { border-radius: 10px; }
.btn-lg { border-radius: var(--radius-lg); padding: .8rem 1.25rem; }

/* Soft (tinted) buttons */
.btn-soft {
  background: #f1f5f9;
  color: var(--text-900);
  border: 1px solid var(--border-200);
}
.btn-soft:hover { background: #e9eef4; }

/* Forms */
.form-label { font-weight: 600; color: var(--text-900); }

.form-control, .form-select, .form-check-input {
  background-color: #fff;
  border: 1px solid var(--border-300);
  color: var(--text-900);
  border-radius: var(--radius-md);
  box-shadow: none;
  transition: border-color .2s ease, box-shadow .2s ease, background-color .2s ease;
}
.form-control::placeholder { color: var(--text-500); }
.form-control:focus, .form-select:focus, .form-check-input:focus {
  border-color: var(--brand-600);
  box-shadow: 0 0 0 4px rgba(58,166,255,.15);
}
.input-group-text {
  background: #f4f7fb;
  border: 1px solid var(--border-300);
  color: var(--text-700);
  border-radius: var(--radius-md);
}

/* Cards */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}
.card-header {
  background: linear-gradient(180deg, #f9fbff 0%, #f3f7fc 100%);
  border-bottom: 1px solid var(--border-200);
  border-top-left-radius: var(--radius-lg);
  border-top-right-radius: var(--radius-lg);
}
.card-title { font-weight: 600; }

/* Lists */
.list-group-item {
  background: var(--bg-surface);
  color: var(--text-900);
  border: 1px solid var(--border-200);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  transition: transform .06s ease, box-shadow .2s ease, background .2s ease;
}
.list-group-item:hover {
  background: #f7fbff;
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

/* Tables */
.table {
  --bs-table-bg: var(--bg-surface);
  --bs-table-striped-bg: #f6fbff;
  --bs-table-striped-color: var(--text-900);
  --bs-table-hover-bg: #f2f7fd;
  color: var(--text-900);
  border-color: var(--border-200);
}
.table th {
  background: #f3f7fc;
  color: var(--text-700);
  font-weight: 600;
  border-bottom: 1px solid var(--border-200);
}
.table td {
  vertical-align: middle;
  border-color: var(--border-200);
}
.table thead th:first-child { border-top-left-radius: var(--radius-md); }
.table thead th:last-child  { border-top-right-radius: var(--radius-md); }

/* Alerts */
.alert {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-200);
  box-shadow: var(--shadow-sm);
}
.alert-success { background: #ecfdf5; color: #065f46; border-color: #a7f3d0; }
.alert-info    { background: #eff6ff; color: #1e40af; border-color: #bfdbfe; }
.alert-warning { background: #fffbeb; color: #92400e; border-color: #fde68a; }
.alert-danger  { background: #fef2f2; color: #991b1b; border-color: #fecaca; }
.alert-secondary { background: #eef2f7; color: #334155; border-color: #e2e8f0; }

/* Badges */
.badge {
  border-radius: var(--radius-pill);
  padding: .4em .6em;
  font-weight: 600;
  letter-spacing: .2px;
}
.badge.bg-success { background: var(--success-500) !important; }
.badge.bg-info    { background: var(--info-500) !important; }
.badge.bg-warning { background: var(--warning-500) !important; color: #111 !important; }
.badge.bg-danger  { background: var(--danger-500) !important; }
.badge.bg-secondary { background: var(--secondary-500) !important; }

/* Navbar (for header.php) */
.app-navbar.navbar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-200);
  box-shadow: var(--shadow-sm);
}
.app-navbar .navbar-brand {
  font-weight: 700;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.app-navbar .nav-link {
  color: var(--text-700);
  border-radius: var(--radius-pill);
  padding: .5rem .85rem;
  transition: background .2s ease, color .2s ease;
}
.app-navbar .nav-link:hover,
.app-navbar .nav-link.active {
  background: #eef6ff;
  color: var(--brand-700);
}

/* Footer (for footer.php) */
.app-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-200);
  color: var(--text-700);
  padding: 1.25rem 0;
  text-align: center;
}

/* Modals */
.modal-content {
  background: var(--bg-surface);
  color: var(--text-900);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-200);
  box-shadow: var(--shadow-lg);
}

/* Utilities */
.gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.btn-gradient {
  background: var(--brand-gradient);
  color: #fff !important;
}
.rounded-xl { border-radius: var(--radius-xl) !important; }
.shadow-soft { box-shadow: var(--shadow-md) !important; }
.shadow-soft:hover { box-shadow: var(--shadow-lg) !important; }

/* Focus visible for accessibility */
:focus-visible {
  outline: 0;
  box-shadow: 0 0 0 4px rgba(22, 209, 160, .18);
  transition: box-shadow .2s ease;
}

/* Reduce motion preference */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}