:root {
  --sb-w: 260px;
  --sb-w-collapsed: 74px;
  --brand: #4f46e5;
  --brand-2: #7c3aed;
  --sb-bg: #111827;
  --sb-text: #9ca3af;
  --sb-hover: rgba(255,255,255,.07);
  --page-bg: #f3f4f8;
  --radius: 14px;
}
[data-bs-theme="dark"] { --page-bg: #0f1420; }

body { background: var(--page-bg); font-family: 'Inter', 'Segoe UI', system-ui, sans-serif; font-size: .95rem; }

/* ---------- Sidebar ---------- */
.sidebar {
  position: fixed; inset: 0 auto 0 0; width: var(--sb-w); z-index: 1040;
  background: linear-gradient(180deg, #111827 0%, #1e1b4b 100%);
  display: flex; flex-direction: column; transition: width .25s ease, transform .25s ease;
  overflow-x: hidden;
}
.sb-brand { display: flex; align-items: center; gap: 12px; padding: 20px 22px; color: #fff; font-weight: 700; font-size: 1.1rem; white-space: nowrap; }
.sb-logo { width: 38px; height: 38px; flex: 0 0 38px; border-radius: 11px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); font-size: 1.1rem; box-shadow: 0 6px 16px rgba(79,70,229,.45); }
.sb-nav { flex: 1; padding: 6px 14px; overflow-y: auto; }
.sb-section { color: #6b7280; font-size: .68rem; font-weight: 700; letter-spacing: .1em; padding: 18px 10px 6px; white-space: nowrap; }
.sb-link {
  display: flex; align-items: center; gap: 14px; padding: 11px 14px; margin-bottom: 3px; border-radius: 10px;
  color: var(--sb-text); text-decoration: none; white-space: nowrap; transition: all .15s;
}
.sb-link i { font-size: 1.15rem; flex: 0 0 22px; text-align: center; }
.sb-link:hover { background: var(--sb-hover); color: #fff; }
.sb-link.active { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; box-shadow: 0 6px 16px rgba(79,70,229,.35); }
.sb-footer { padding: 12px 14px 18px; border-top: 1px solid rgba(255,255,255,.08); }

/* collapsed (desktop) */
.sb-collapsed .sidebar { width: var(--sb-w-collapsed); }
.sb-collapsed .sb-brand-text, .sb-collapsed .sb-link span, .sb-collapsed .sb-section { display: none; }
.sb-collapsed .sb-link { justify-content: center; padding: 11px 0; }
.sb-collapsed .sb-brand { justify-content: center; padding: 20px 0; }
.sb-collapsed .main-wrap { margin-left: var(--sb-w-collapsed); }

/* ---------- Main area ---------- */
.main-wrap { margin-left: var(--sb-w); min-height: 100vh; display: flex; flex-direction: column; transition: margin-left .25s ease; }
.topbar {
  position: sticky; top: 0; z-index: 1030; display: flex; align-items: center; gap: 14px; padding: 12px 24px;
  background: rgba(255,255,255,.85); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(0,0,0,.06);
}
[data-bs-theme="dark"] .topbar { background: rgba(21,27,41,.85); border-bottom-color: rgba(255,255,255,.08); }
.topbar-title { font-weight: 700; }
.content { padding: 26px 24px; flex: 1; }
.app-footer { padding: 14px 24px; text-align: center; font-size: .8rem; color: #9ca3af; }

.icon-btn { width: 40px; height: 40px; border: 0; border-radius: 10px; background: transparent; color: inherit; font-size: 1.25rem; display: grid; place-items: center; }
.icon-btn:hover { background: rgba(127,127,127,.15); }
.user-chip { display: flex; align-items: center; gap: 10px; padding: 5px 10px 5px 5px; border-radius: 40px; text-decoration: none; color: inherit; }
.user-chip:hover { background: rgba(127,127,127,.12); }
.avatar { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700;
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); }

/* ---------- Cards, tables, forms ---------- */
.card { border: 0; border-radius: var(--radius); box-shadow: 0 2px 14px rgba(17,24,39,.06); }
[data-bs-theme="dark"] .card { box-shadow: 0 2px 14px rgba(0,0,0,.35); }
.table > :not(caption) > * > * { padding: .8rem .9rem; }
.table thead th { font-size: .74rem; text-transform: uppercase; letter-spacing: .05em; color: #6b7280; font-weight: 700; border-bottom-width: 1px; white-space: nowrap; }
.table-hover > tbody > tr:hover > * { background: rgba(79,70,229,.05); }
.form-control, .form-select { border-radius: 10px; padding: .6rem .85rem; }
.form-control:focus, .form-select:focus { border-color: var(--brand); box-shadow: 0 0 0 .2rem rgba(79,70,229,.18); }
.btn { border-radius: 10px; font-weight: 500; }
.btn-primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); border: 0; }
.btn-primary:hover { filter: brightness(1.08); background: linear-gradient(135deg, var(--brand), var(--brand-2)); }
.alert { border: 0; border-radius: 12px; }
.page-link { border-radius: 8px !important; margin: 0 2px; border: 0; color: var(--brand); }
.page-item.active .page-link { background: var(--brand); color: #fff; }

/* dashboard stat cards */
.stat-card { border-radius: var(--radius); padding: 20px 22px; color: #fff; box-shadow: 0 8px 22px rgba(17,24,39,.15); transition: transform .15s; }
.stat-card:hover { transform: translateY(-3px); }
.stat-card h2 { font-weight: 700; margin: 4px 0 0; }
.bg-g1 { background: linear-gradient(135deg, #4f46e5, #7c3aed); }
.bg-g2 { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.bg-g3 { background: linear-gradient(135deg, #0ea5e9, #6366f1); }
.bg-g4 { background: linear-gradient(135deg, #10b981, #059669); }

/* optional stat cards: <div class="card stat-card">...</div> */
.stat-card .stat-icon { width: 50px; height: 50px; border-radius: 14px; display: grid; place-items: center; font-size: 1.4rem; color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); }

/* ---------- Login / Register ---------- */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 20px;
  background: linear-gradient(135deg, #1e1b4b 0%, #4f46e5 55%, #7c3aed 100%); }
.auth-card { width: 100%; max-width: 420px; background: #fff; border-radius: 18px; padding: 34px 32px; box-shadow: 0 25px 60px rgba(0,0,0,.3); }

/* ---------- Mobile ---------- */
.sb-backdrop { display: none; }
@media (max-width: 991.98px) {
  .sidebar { transform: translateX(-100%); width: var(--sb-w) !important; }
  .main-wrap, .sb-collapsed .main-wrap { margin-left: 0; }
  .sb-collapsed .sb-brand-text, .sb-collapsed .sb-link span, .sb-collapsed .sb-section { display: revert; }
  .sb-collapsed .sb-link { justify-content: flex-start; padding: 11px 14px; }
  .sb-open .sidebar { transform: none; }
  .sb-open .sb-backdrop { display: block; position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 1035; }
  .content { padding: 18px 14px; }
}