:root {
  --bg-color: #0d0f12;
  --sidebar-bg: #14181d;
  --card-bg: #1a1f26;
  --card-border: #2a313d;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --insta-gradient: linear-gradient(135deg, #833ab4, #fd1d1d, #fcb045);
  --insta-pink: #e1306c;
  --insta-purple: #833ab4;
  --insta-orange: #f77737;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  --accent-blue: #3b82f6;
  --radius: 12px;
}

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

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

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--card-border);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
}

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

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--insta-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: white;
  box-shadow: 0 4px 12px rgba(225, 48, 108, 0.4);
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

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

.nav-item {
  padding: 12px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.2s ease;
}

.nav-item:hover, .nav-item.active {
  background: rgba(225, 48, 108, 0.15);
  color: white;
}

.nav-item.active {
  border-left: 4px solid var(--insta-pink);
}

/* Main Content */
.main-wrapper {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
}

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

.page-title {
  font-size: 26px;
  font-weight: 800;
}

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

.stat-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

.stat-val {
  font-size: 28px;
  font-weight: 800;
  background: var(--insta-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Tab Panels */
.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Cards & Forms */
.panel-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-row {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.form-group {
  flex: 1;
  min-width: 240px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

input, select, textarea {
  background-color: #12151a;
  border: 1px solid var(--card-border);
  color: white;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border 0.2s ease;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--insta-pink);
}

.btn {
  padding: 10px 20px;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--insta-gradient);
  color: white;
}

.btn-success {
  background-color: var(--accent-green);
  color: white;
}

.btn-danger {
  background-color: var(--accent-red);
  color: white;
}

.btn-secondary {
  background-color: #2a313d;
  color: white;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

/* Tables */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th, td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--card-border);
  font-size: 14px;
}

th {
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 12px;
}

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

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
}

.badge-green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
}

.badge-red {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
}

.badge-yellow {
  background: rgba(252, 176, 69, 0.15);
  color: var(--insta-orange);
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  justify-content: center;
  align-items: center;
  z-index: 999;
}

.modal-overlay.active {
  display: flex;
}

.modal-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  width: 90%;
  max-width: 440px;
  padding: 24px;
}

.alert-toast {
  position: fixed;
  top: 24px;
  right: 24px;
  padding: 14px 20px;
  background: var(--card-bg);
  border-left: 4px solid var(--insta-pink);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  font-size: 14px;
  display: none;
  z-index: 1000;
}