/* ===== CSS Variables ===== */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg: #f9fafb;
  --card: #ffffff;
  --border: #e5e7eb;
  --text: #111827;
  --text-muted: #6b7280;
  --sidebar-width: 240px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 14px; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
button { cursor: pointer; font-family: inherit; }

/* ===== Layout ===== */
.app { display: flex; min-height: 100vh; }

/* ===== Sidebar ===== */
.sidebar {
  width: var(--sidebar-width);
  background: var(--card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform .3s;
}
.sidebar-header { padding: 20px 16px; border-bottom: 1px solid var(--border); }
.sidebar-logo { font-size: 1.1rem; font-weight: 700; color: var(--primary); }
.sidebar-sub { font-size: .75rem; color: var(--text-muted); }
.sidebar-nav { flex: 1; padding: 12px 0; overflow-y: auto; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; color: var(--text-muted);
  font-size: .9rem; cursor: pointer;
  border-left: 3px solid transparent;
  transition: all .2s;
}
.nav-item:hover { background: var(--bg); color: var(--text); }
.nav-item.active { background: #eef2ff; color: var(--primary); border-left-color: var(--primary); font-weight: 500; }
.nav-item.danger { color: var(--danger); }
.sidebar-footer { padding: 16px; border-top: 1px solid var(--border); }

/* ===== Main Content ===== */
.main { flex: 1; margin-left: var(--sidebar-width); display: flex; flex-direction: column; }
.topbar { background: var(--card); border-bottom: 1px solid var(--border); padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 60px; }
.topbar-title { font-weight: 600; font-size: 1.1rem; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.content { padding: 24px; flex: 1; }

/* ===== Cards ===== */
.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; margin-bottom: 20px; }
.card-title { font-size: 1rem; font-weight: 600; margin-bottom: 16px; color: var(--text); }
.card-title small { font-weight: 400; color: var(--text-muted); font-size: .8rem; margin-left: 8px; }

/* ===== Stats Grid ===== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; }
.stat-label { font-size: .8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 8px; }
.stat-value { font-size: 1.8rem; font-weight: 700; color: var(--text); }
.stat-value.success { color: var(--success); }
.stat-value.warning { color: var(--warning); }
.stat-value.danger { color: var(--danger); }

/* ===== Tables ===== */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: .875rem; }
th { font-weight: 600; color: var(--text-muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .5px; background: var(--bg); }
tr:hover td { background: #f9fafb; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 9999px; font-size: .7rem; font-weight: 600; }
.badge-green { background: #d1fae5; color: #065f46; }
.badge-yellow { background: #fef3c7; color: #92400e; }
.badge-red { background: #fee2e2; color: #991b1b; }
.badge-gray { background: #f3f4f6; color: #374151; }

/* ===== Forms ===== */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-weight: 500; margin-bottom: 6px; font-size: .875rem; }
.form-label small { font-weight: 400; color: var(--text-muted); }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: .875rem; font-family: inherit;
  transition: border-color .2s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,.1); }
.form-textarea { resize: vertical; min-height: 80px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px; border: none; border-radius: 6px; font-size: .875rem; font-weight: 500; cursor: pointer; transition: all .2s; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-outline { background: white; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--bg); }
.btn-sm { padding: 4px 10px; font-size: .8rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-group { display: flex; gap: 8px; }

/* ===== Auth Pages ===== */
.auth-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.auth-card { background: white; border-radius: 16px; padding: 40px; width: 100%; max-width: 400px; box-shadow: 0 20px 60px rgba(0,0,0,.2); }
.auth-title { font-size: 1.5rem; font-weight: 700; text-align: center; margin-bottom: 8px; }
.auth-sub { text-align: center; color: var(--text-muted); font-size: .875rem; margin-bottom: 32px; }

/* ===== Modal ===== */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.5); display: flex; align-items: center; justify-content: center; z-index: 1000; }
.modal { background: white; border-radius: 12px; padding: 24px; width: 100%; max-width: 500px; max-height: 90vh; overflow-y: auto; }
.modal-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 20px; }
.modal-close { float: right; cursor: pointer; font-size: 1.2rem; color: var(--text-muted); }

/* ===== Toast ===== */
.toast-container { position: fixed; top: 20px; right: 20px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast { padding: 12px 20px; border-radius: 8px; color: white; font-size: .875rem; font-weight: 500; box-shadow: 0 4px 12px rgba(0,0,0,.15); animation: slideIn .3s; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ===== Promo Code Display ===== */
.promo-box { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; border-radius: 12px; padding: 24px; text-align: center; }
.promo-code { font-size: 2rem; font-weight: 700; font-family: 'Courier New', monospace; letter-spacing: 4px; margin: 12px 0; }
.copy-btn { background: rgba(255,255,255,.2); border: 1px solid rgba(255,255,255,.4); color: white; padding: 6px 16px; border-radius: 6px; cursor: pointer; font-size: .85rem; }

/* ===== Tabs ===== */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--border); margin-bottom: 20px; }
.tab { padding: 8px 16px; cursor: pointer; font-size: .875rem; font-weight: 500; color: var(--text-muted); border-bottom: 2px solid transparent; margin-bottom: -2px; }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }

/* ===== Utility ===== */
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-right { text-align: right; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.hidden { display: none !important; }
.loading { text-align: center; padding: 40px; color: var(--text-muted); }
.empty { text-align: center; padding: 40px; color: var(--text-muted); }
.empty-icon { font-size: 3rem; margin-bottom: 12px; }

/* ===== Pagination ===== */
.pagination { display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 20px; }
.page-btn { padding: 6px 12px; border: 1px solid var(--border); background: white; border-radius: 6px; cursor: pointer; font-size: .85rem; }
.page-btn.active { background: var(--primary); color: white; border-color: var(--primary); }
.page-btn:disabled { opacity: .4; cursor: not-allowed; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .form-row { grid-template-columns: 1fr; }
}