:root {
  --admin-primary: #1f7ae0;
  --admin-bg: #f2f4f7;
  --admin-sidebar-bg: #171d2b;
  --admin-sidebar-active: #1f7ae0;
}

* { box-sizing: border-box; }
body { background: var(--admin-bg); font-family: "PingFang SC", "Microsoft YaHei", sans-serif; margin: 0; }

.admin-shell { display: flex; min-height: 100vh; }

.admin-sidebar {
  width: 220px;
  flex: none;
  background: var(--admin-sidebar-bg);
  color: #cbd3e1;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.admin-logo { padding: 20px 18px; font-size: 17px; font-weight: 700; color: #fff; }
.admin-logo span { font-size: 12px; font-weight: 400; color: #7c8698; margin-left: 6px; }
.admin-nav { padding: 8px 0; }
.nav-group-title { padding: 14px 18px 6px; font-size: 11px; color: #5f6a80; letter-spacing: 1px; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 18px; color: #cbd3e1; text-decoration: none; font-size: 14px; }
.nav-item:hover { background: rgba(255,255,255,0.06); color: #fff; }
.nav-item.active { background: var(--admin-sidebar-active); color: #fff; }
.nav-item i { font-size: 16px; width: 18px; text-align: center; }

.admin-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.admin-topbar { height: 58px; flex: none; background: #fff; border-bottom: 1px solid #e7eaef; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; }
.admin-topbar-title { font-weight: 700; font-size: 15px; color: #1a1d21; }
.admin-topbar-user { display: flex; align-items: center; gap: 8px; font-size: 13px; color: #4b525c; }
.admin-content { flex: 1; padding: 20px 24px 40px; }

.page-header { display: flex; align-items: center; margin-bottom: 16px; gap: 10px; }
.page-header h5 { margin: 0; font-weight: 700; }

.card-panel { background: #fff; border-radius: 10px; padding: 18px; box-shadow: 0 1px 2px rgba(0,0,0,0.04); }

.table-toolbar { display: flex; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; align-items: center; }

.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(160deg, #12213a, #1f7ae0); }
.login-card { width: 360px; background: #fff; border-radius: 16px; padding: 36px 32px; box-shadow: 0 20px 60px rgba(0,0,0,0.25); }
.login-card h3 { text-align: center; margin-bottom: 4px; }
.login-card p.sub { text-align: center; color: #9aa1ab; font-size: 12px; margin-bottom: 24px; }

.stat-card { background: #fff; border-radius: 10px; padding: 18px; display: flex; flex-direction: column; gap: 6px; }
.stat-card .v { font-size: 26px; font-weight: 700; color: #1a1d21; }
.stat-card .n { font-size: 12px; color: #9aa1ab; }

textarea.form-control { min-height: 80px; }