:root {
  --primary: #1a56db;
  --primary-dark: #1244b8;
  --success: #0e9f6e;
  --warning: #c27803;
  --danger: #e02424;
  --mtn: #FFCC00;
  --mtn-text: #333;
  --airtel: #e40000;
  --glo: #009a44;
  --sidebar-bg: #1e2536;
  --sidebar-text: #c1c7d8;
  --sidebar-active: #2d3650;
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --border: #e5e7eb;
  --text: #111827;
  --text-muted: #6b7280;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); }

/* ── AUTH PAGES ── */
.auth-wrapper { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #1e2536 0%, #1a56db 100%); }
.auth-card { background: #fff; border-radius: 12px; padding: 40px; width: 100%; max-width: 420px; box-shadow: 0 20px 60px rgba(0,0,0,.25); }
.auth-logo { text-align: center; margin-bottom: 28px; }
.auth-logo img { height: 40px; }
.auth-logo h2 { font-size: 1.4rem; color: var(--primary); font-weight: 700; margin-top: 8px; }
.auth-logo p { color: var(--text-muted); font-size: .875rem; }
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: .875rem; font-weight: 500; margin-bottom: 6px; color: #374151; }
.form-control { width: 100%; padding: 10px 14px; border: 1.5px solid var(--border); border-radius: 8px; font-size: .9rem; transition: border-color .2s; outline: none; }
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,86,219,.1); }
.input-group { position: relative; }
.input-group .form-control { padding-right: 42px; }
.input-toggle { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); cursor: pointer; color: var(--text-muted); background: none; border: none; font-size: 1rem; }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 20px; border-radius: 8px; font-size: .9rem; font-weight: 600; cursor: pointer; border: none; transition: all .2s; }
.btn-primary { background: var(--primary); color: #fff; width: 100%; justify-content: center; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-sm { padding: 6px 14px; font-size: .8rem; }
.btn-outline { background: transparent; border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.auth-footer { text-align: center; margin-top: 18px; font-size: .85rem; color: var(--text-muted); }
.auth-footer a { color: var(--primary); text-decoration: none; font-weight: 500; }
.alert { padding: 10px 14px; border-radius: 8px; font-size: .875rem; margin-bottom: 16px; }
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #ecfdf5; color: var(--success); border: 1px solid #a7f3d0; }

/* ── LAYOUT ── */
.layout { display: flex; min-height: 100vh; }

/* ── SIDEBAR ── */
.sidebar { width: 240px; background: var(--sidebar-bg); color: var(--sidebar-text); display: flex; flex-direction: column; flex-shrink: 0; }
.sidebar-logo { padding: 20px 20px 16px; border-bottom: 1px solid rgba(255,255,255,.08); }
.sidebar-logo h2 { font-size: 1.1rem; font-weight: 700; color: #fff; }
.sidebar-logo span { font-size: .75rem; color: rgba(255,255,255,.4); }
.sidebar-nav { flex: 1; padding: 12px 0; }
.nav-section { padding: 12px 16px 4px; font-size: .7rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: rgba(255,255,255,.3); }
.nav-link { display: flex; align-items: center; gap: 10px; padding: 9px 20px; color: var(--sidebar-text); text-decoration: none; font-size: .875rem; transition: all .15s; border-left: 3px solid transparent; }
.nav-link:hover { background: var(--sidebar-active); color: #fff; }
.nav-link.active { background: var(--sidebar-active); color: #fff; border-left-color: var(--primary); }
.nav-link i { width: 18px; text-align: center; font-size: .95rem; }
.sidebar-footer { padding: 16px 20px; border-top: 1px solid rgba(255,255,255,.08); }
.sidebar-user { display: flex; align-items: center; gap: 10px; }
.sidebar-avatar { width: 34px; height: 34px; background: var(--primary); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: .85rem; color: #fff; font-weight: 700; flex-shrink: 0; }
.sidebar-name { font-size: .8rem; color: #fff; font-weight: 500; }
.sidebar-role { font-size: .7rem; color: rgba(255,255,255,.4); }

/* ── MAIN ── */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar { background: #fff; border-bottom: 1px solid var(--border); padding: 14px 28px; display: flex; align-items: center; justify-content: space-between; }
.topbar h1 { font-size: 1.1rem; font-weight: 700; }
.topbar-actions { display: flex; gap: 10px; align-items: center; }
.content { padding: 28px; flex: 1; }

/* ── CARDS ── */
.card { background: var(--card-bg); border-radius: 10px; border: 1px solid var(--border); }
.card-header { padding: 16px 20px; border-bottom: 1px solid var(--border); font-weight: 600; font-size: .95rem; display: flex; align-items: center; justify-content: space-between; }
.card-body { padding: 20px; }

/* ── STAT CARDS ── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 18px; margin-bottom: 24px; }
.stat-card { background: var(--card-bg); border-radius: 10px; border: 1px solid var(--border); padding: 20px; }
.stat-card.mtn { border-top: 3px solid var(--mtn); }
.stat-card.airtel { border-top: 3px solid var(--airtel); }
.stat-card.glo { border-top: 3px solid var(--glo); }
.stat-card.total { border-top: 3px solid var(--primary); }
.stat-network { font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); margin-bottom: 8px; display: flex; align-items: center; gap: 6px; }
.stat-dot { width: 8px; height: 8px; border-radius: 50%; }
.stat-dot.mtn { background: var(--mtn); border: 1px solid #ccc; }
.stat-dot.airtel { background: var(--airtel); }
.stat-dot.glo { background: var(--glo); }
.stat-dot.primary { background: var(--primary); }
.stat-value { font-size: 1.8rem; font-weight: 700; line-height: 1; margin-bottom: 4px; }
.stat-label { font-size: .8rem; color: var(--text-muted); }
.stat-sub { font-size: .75rem; color: var(--text-muted); margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); }

/* ── CHART ── */
.chart-container { height: 280px; position: relative; }

/* ── TABLE ── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .875rem; }
th { text-align: left; padding: 10px 14px; background: #f9fafb; border-bottom: 1px solid var(--border); font-weight: 600; color: var(--text-muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; }
td { padding: 10px 14px; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #f9fafb; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: .72rem; font-weight: 600; text-transform: uppercase; }
.badge-mtn { background: #fffbeb; color: var(--warning); }
.badge-airtel { background: #fef2f2; color: var(--danger); }
.badge-glo { background: #f0fdf4; color: var(--success); }
.badge-other { background: #f3f4f6; color: var(--text-muted); }

/* ── FORM ELEMENTS ── */
.filter-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; margin-bottom: 20px; }
.filter-group { display: flex; flex-direction: column; gap: 5px; }
.filter-group label { font-size: .8rem; font-weight: 500; color: var(--text-muted); }
select, input[type="date"] { padding: 8px 12px; border: 1.5px solid var(--border); border-radius: 8px; font-size: .875rem; outline: none; background: #fff; }
select:focus, input[type="date"]:focus { border-color: var(--primary); }

/* ── MODAL ── */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.5); display: flex; align-items: center; justify-content: center; z-index: 1000; padding: 20px; }
.modal-overlay.hidden { display: none; }
.modal { background: #fff; border-radius: 12px; padding: 28px; width: 100%; max-width: 480px; }
.modal h3 { font-size: 1.1rem; margin-bottom: 20px; font-weight: 700; }
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }

/* ── PAGINATION ── */
.pagination { display: flex; align-items: center; gap: 6px; margin-top: 16px; font-size: .875rem; }
.page-info { color: var(--text-muted); flex: 1; }

/* ── MISC ── */
.empty-state { text-align: center; padding: 48px 20px; color: var(--text-muted); }
.empty-state i { font-size: 2.5rem; margin-bottom: 12px; opacity: .4; }
.spinner { display: inline-block; width: 18px; height: 18px; border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.text-muted { color: var(--text-muted); }
.gap-2 { gap: 8px; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 768px) {
  .sidebar { display: none; }
  .grid-2 { grid-template-columns: 1fr; }
  .content { padding: 16px; }
}