/* BilimArena AI - Admin Dashboard Stylesheet */
:root {
  --bg-dark: #0a0f1d;
  --bg-card: rgba(16, 24, 48, 0.85);
  --bg-sidebar: #070b16;
  --border-color: rgba(255, 255, 255, 0.08);
  --primary: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.25);
  --accent: #818cf8;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --radius: 12px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
}

/* Layout */
.sidebar {
  width: 260px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.brand-icon {
  font-size: 28px;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.nav-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-item a:hover, .nav-item.active a {
  background: var(--primary-glow);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.nav-logout {
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.main-content {
  margin-left: 260px;
  flex: 1;
  padding: 32px;
  background: radial-gradient(circle at top right, rgba(56, 189, 248, 0.05), transparent 40%);
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

.page-title {
  font-size: 26px;
  font-weight: 700;
}

.page-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* KPI Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  margin: 8px 0;
  color: #fff;
}

/* Tables & Containers */
.card-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  backdrop-filter: blur(12px);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

th {
  padding: 14px 16px;
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.5px;
}

td {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
}

.badge-blue { background: rgba(56, 189, 248, 0.15); color: #38bdf8; }
.badge-green { background: rgba(16, 185, 129, 0.15); color: #10b981; }
.badge-purple { background: rgba(129, 140, 248, 0.15); color: #818cf8; }
.badge-yellow { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }

/* Buttons & Inputs */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #38bdf8, #6366f1);
  color: #fff;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.btn-danger:hover {
  background: #ef4444;
  color: #fff;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  background: rgba(10, 15, 29, 0.8);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: #fff;
  font-size: 14px;
  margin-top: 6px;
  outline: none;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.form-group {
  margin-bottom: 16px;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  width: 100%;
  max-width: 600px;
  padding: 28px;
  max-height: 90vh;
  overflow-y: auto;
}