/* ===============================
   Modern UI Theme (light + dark)
   - Non-destructive: layered atop Bootstrap + existing CSS
   - Uses CSS variables and sensible defaults
   - Focused on clean typography, spacing, and components
   =============================== */

:root {
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;

  /* Light palette */
  --bg: #f7f8fa;
  --surface: #ffffff;
  --muted: #eef0f3;
  --text: #111827;
  --text-muted: #4b5563;
  --border: #e5e7eb;
  --primary: #4f46e5; /* indigo-600 */
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --shadow: 0 10px 25px rgba(0,0,0,.08), 0 2px 8px rgba(0,0,0,.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f18;
    --surface: #0f1623;
    --muted: #1a2233;
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --border: #253048;
    --primary: #8b93f9;
    --primary-600: #8b93f9;
    --primary-700: #727cf7;
    --shadow: 0 8px 24px rgba(0,0,0,.6), 0 2px 6px rgba(0,0,0,.4);
  }
}

/* Base / reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}
body.bg-dark { /* compat with existing pages that set bg-dark */
  background: var(--bg) !important;
  color: var(--text) !important;
}
img, video { max-width: 100%; height: auto; }

/* Links */
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Containers */
.container-modern {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
}
.section {
  margin: 24px 0;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
}
.card-body { padding: 20px; }
.card-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 12px;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--text);
}
h1 { font-size: clamp(28px, 3vw, 36px); }
h2 { font-size: clamp(24px, 2.5vw, 30px); }
h3 { font-size: clamp(20px, 2vw, 24px); }
.lead { font-size: 1.125rem; color: var(--text-muted); }

/* Forms */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="file"],
select,
textarea {
  display: block;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color .2s, box-shadow .2s, background .2s;
}
input::placeholder, textarea::placeholder { color: var(--text-muted); }
input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}
.form-group { margin-bottom: 16px; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 768px) {
  .form-row-2 { grid-template-columns: repeat(2, 1fr); }
  .form-row-3 { grid-template-columns: repeat(3, 1fr); }
}
label { font-weight: 600; margin-bottom: 6px; display: block; color: var(--text); }

/* Buttons */
.btn,
button,
input[type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: var(--muted);
  color: var(--text);
  cursor: pointer;
  transition: transform .05s ease, background .2s, border-color .2s, color .2s, box-shadow .2s;
  text-decoration: none;
  user-select: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 40%, transparent); outline-offset: 2px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-700); }
.btn-outline { background: transparent; border-color: var(--border); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }

/* Tables */
.table-modern {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.table-modern thead th {
  background: var(--muted);
  text-align: left;
  padding: 12px 14px;
  font-weight: 700;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}
.table-modern tbody td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.table-modern tbody tr:hover { background: color-mix(in srgb, var(--muted) 50%, transparent); }
.table-responsive { width: 100%; overflow-x: auto; }

/* Navbar */
.navbar-modern {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
@media (prefers-color-scheme: dark) {
  .navbar-modern { background: rgba(15,22,35,.7); }
}
.navbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1120px; margin: 0 auto; padding: 12px 20px;
}
.navbar-brand { font-weight: 800; letter-spacing: .2px; }
.navbar-actions { display: flex; gap: 8px; }

/* Badges & alerts */
.badge { display: inline-block; padding: 4px 10px; border-radius: 999px; font-weight: 700; }
.badge-primary { background: color-mix(in srgb, var(--primary) 18%, transparent); color: var(--primary); }
.alert {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
}
.alert-info { border-color: color-mix(in srgb, var(--primary) 30%, var(--border)); }

/* Utility */
.shadow-soft { box-shadow: var(--shadow); }
.rounded { border-radius: var(--radius); }
.m-0{margin:0}.mt-2{margin-top:8px}.mt-3{margin-top:12px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}
.mb-2{margin-bottom:8px}.mb-3{margin-bottom:12px}.mb-4{margin-bottom:16px}.mb-6{margin-bottom:24px}
.p-2{padding:8px}.p-3{padding:12px}.p-4{padding:16px}.p-6{padding:24px}
.flex{display:flex}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}
.hidden{display:none}

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


/* Enhance Bootstrap .table for immediate modernization */
.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.table thead th {
  background: var(--muted);
  border-bottom: 1px solid var(--border) !important;
}
.table td, .table th {
  padding: 12px 14px !important;
  border-bottom: 1px solid var(--border) !important;
}
.table-hover tbody tr:hover { background: color-mix(in srgb, var(--muted) 50%, transparent); }

/* Form control compatibility with Bootstrap */
.form-control, .form-select {
  border-radius: var(--radius-sm);
  border-color: var(--border);
  background: var(--surface);
  color: var(--text);
}
.form-control:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}

/* Card compatibility with Bootstrap */
.card.border-0, .card {
  border-radius: var(--radius);
  border-color: var(--border);
  box-shadow: var(--shadow);
  background: var(--surface);
}

/* Buttons compatibility with Bootstrap */
.btn-primary { background-color: var(--primary) !important; border-color: transparent !important; }
.btn-outline-primary { color: var(--primary); border-color: var(--primary); }
.btn-outline-primary:hover { background: var(--primary); color: #fff; }