:root {
  --primary: #16224f;
  --primary-dark: #0c1533;
  --gold: #f5b400;
  --gold-dark: #d99b00;
  --success: #00b894;
  --danger: #d63031;
  --bg: #f4f5fa;
  --card: #ffffff;
  --text: #2d3436;
  --muted: #636e72;
}

* { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', Roboto, Arial, sans-serif;
  margin: 0;
  padding-bottom: 40px;
}

.navbar-custom {
  background: #ffffff;
  color: var(--primary);
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  border-bottom: 3px solid var(--gold);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.navbar-custom .brand {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-custom .brand img {
  height: 38px;
  width: auto;
  display: block;
}

.navbar-custom a.btn-logout {
  color: #fff;
  background: var(--primary);
  padding: 6px 14px;
  border-radius: 20px;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
}
.navbar-custom a.btn-logout:hover { background: var(--primary-dark); }

.container-app {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px;
}

.container-app.wide { max-width: 1000px; }

.card-app {
  background: var(--card);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.stat-box {
  background: var(--card);
  border-radius: 14px;
  padding: 16px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

.stat-box .value { font-size: 1.8rem; font-weight: 800; color: var(--primary); }
.stat-box .value.gold { color: var(--gold-dark); }
.stat-box .label { font-size: 0.8rem; color: var(--muted); margin-top: 4px; }

.badge-pill {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
}
.bg-success { background: var(--success); }
.bg-danger { background: var(--danger); }
.bg-info { background: #0984e3; }
.bg-secondary { background: #b2bec3; }

.prize-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: linear-gradient(135deg, #fff7e6, #fff);
  border: 1px solid #ffe4a3;
  border-radius: 14px;
  padding: 14px;
  margin-bottom: 12px;
}
.prize-card img {
  width: 64px; height: 64px; object-fit: cover; border-radius: 10px;
  background: #eee;
}
.prize-card .rank-tag {
  font-weight: 700;
  color: #b8860b;
  font-size: 0.85rem;
}

.referral-box {
  background: #eef0ff;
  border: 1px dashed var(--primary);
  border-radius: 12px;
  padding: 12px;
  display: flex;
  gap: 8px;
  align-items: center;
  word-break: break-all;
}

.btn-app {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  font-size: 0.95rem;
}
.btn-app:hover { background: var(--primary-dark); color: #fff; }
.btn-app.small { padding: 6px 12px; font-size: 0.8rem; }
.btn-app.danger { background: var(--danger); }
.btn-app.success { background: var(--success); }
.btn-app.gold { background: var(--gold); color: var(--primary); }
.btn-app.gold:hover { background: var(--gold-dark); }
.btn-app.outline { background: transparent; color: var(--primary); border: 1px solid var(--primary); }

.form-control-app {
  width: 100%;
  padding: 11px 14px;
  border-radius: 10px;
  border: 1px solid #dfe6e9;
  margin-bottom: 12px;
  font-size: 0.95rem;
}

table.table-app {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
}
table.table-app th, table.table-app td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid #f1f2f6;
  font-size: 0.9rem;
}
table.table-app th { background: #f8f9ff; color: var(--muted); }
.table-scroll { overflow-x: auto; }

.rank-1 { color: #d4af37; font-weight: 800; }
.rank-2 { color: #9aa5b1; font-weight: 800; }
.rank-3 { color: #cd7f32; font-weight: 800; }

.alert-app {
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 14px;
  font-size: 0.9rem;
}
.alert-success { background: #d4f7ea; color: #00734d; }
.alert-danger { background: #fde2e2; color: #b71c1c; }

.sidebar-links a {
  display: block;
  padding: 10px 6px;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid #f1f2f6;
}

@media (min-width: 768px) {
  .admin-layout { display: flex; }
  .admin-sidebar { width: 220px; flex-shrink: 0; }
  .admin-content { flex: 1; padding-left: 20px; }
}