:root {
  --bg: #f8fafc;
  --panel: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --primary: #0f172a;
  --link: #2563eb;
  --green: #047857;
  --green-bg: #ecfdf5;
  --red: #dc2626;
  --red-bg: #fef2f2;
  --amber: #b45309;
  --amber-bg: #fffbeb;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { margin: 0; color: var(--dark); }

/* Thanh trên cùng */
.topbar { display: flex; align-items: center; gap: 14px; height: 54px; padding: 0 20px; background: var(--dark); color: #e2e8f0; position: sticky; top: 0; z-index: 50; }
.topbar a { color: #e2e8f0; }
.logo { font-weight: 900; letter-spacing: .08em; color: #fff !important; text-decoration: none !important; }
.site-switch { display: flex; align-items: center; gap: 6px; margin: 0; }
.site-switch label { font-size: 11px; color: #94a3b8; text-transform: uppercase; }
.site-switch select { height: 32px; border-radius: 6px; border: 1px solid #334155; background: var(--dark-2); color: #fff; padding: 0 8px; font-weight: 700; max-width: 220px; }
.nav { display: flex; align-items: center; height: 100%; }
.nav > a, .nav-group > span, .nav-soon { display: flex; align-items: center; height: 54px; padding: 0 12px; font-weight: 700; cursor: pointer; }
.nav > a:hover, .nav > a.active, .nav-group:hover > span, .nav-group.active > span { background: var(--dark-2); text-decoration: none; }
.nav-soon { color: #64748b; cursor: default; }
.nav-group { position: relative; height: 100%; }
.dropdown { display: none; position: absolute; top: 54px; left: 0; min-width: 200px; background: #fff; border: 1px solid var(--border); box-shadow: 0 12px 28px rgba(15,23,42,.12); }
.dropdown a { display: block; padding: 10px 14px; color: var(--text); border-bottom: 1px solid #f1f5f9; }
.nav-group:hover .dropdown { display: block; }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 14px; font-size: 13px; }
.user-name { color: #94a3b8; }
.inline { display: inline; margin: 0; }
button.link { background: none; border: 0; color: #e2e8f0; cursor: pointer; font: inherit; padding: 0; }
button.link:hover { text-decoration: underline; }

/* Trang */
.page { padding: 22px; max-width: 1400px; margin: 0 auto; }
.page-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.page-title { font-size: 22px; font-weight: 800; }
.help { font-size: 12px; color: var(--muted); margin-top: 4px; }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; }
.panel-pad { padding: 18px; }
.section-title { font-size: 15px; font-weight: 800; margin-bottom: 12px; }
.empty { padding: 36px; text-align: center; color: #94a3b8; }
.flash { position: fixed; right: 18px; top: 70px; z-index: 80; padding: 12px 16px; border-radius: 8px; color: #fff; box-shadow: 0 8px 30px rgba(0,0,0,.15); transition: .25s; max-width: 480px; }
.flash.success { background: #059669; }
.flash.error { background: var(--red); }
.flash.hide { opacity: 0; transform: translateY(-8px); pointer-events: none; }

/* Nút */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 36px; padding: 0 14px; border-radius: 7px; font: inherit; font-weight: 700; border: 1px solid transparent; cursor: pointer; text-decoration: none !important; white-space: nowrap; }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--dark-2); }
.btn.secondary { background: #fff; border-color: #cbd5e1; color: #334155; }
.btn.secondary:hover { background: #f8fafc; }
.btn.danger { background: #fff; border-color: #fecaca; color: var(--red); }
.btn.small { height: 28px; padding: 0 9px; font-size: 12px; }
.btn[disabled], .btn.loading { opacity: .55; pointer-events: none; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* Form */
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 18px; }
.form-grid .full { grid-column: 1 / -1; }
.field label { display: block; font-size: 12px; font-weight: 700; color: #475569; margin-bottom: 6px; }
.input, .select, .textarea { width: 100%; border: 1px solid #cbd5e1; border-radius: 7px; background: #fff; padding: 8px 10px; font: inherit; outline: none; }
.input, .select { height: 38px; }
.textarea { min-height: 90px; resize: vertical; }
.input:focus, .select:focus, .textarea:focus { border-color: #64748b; box-shadow: 0 0 0 3px rgba(100,116,139,.12); }
.check { display: flex; align-items: center; gap: 8px; font-weight: 600; cursor: pointer; }
.check-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 6px; padding: 10px; border: 1px solid var(--border); border-radius: 7px; background: #f8fafc; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; padding: 14px; border-bottom: 1px solid var(--border); }
.filters .field { min-width: 160px; }

/* Bảng */
.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; }
.table th { background: #f8fafc; color: var(--muted); text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: .04em; padding: 10px 12px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.table td { padding: 10px 12px; border-bottom: 1px solid #f1f5f9; vertical-align: top; }
.table tr:last-child td { border-bottom: 0; }
.table tr:hover td { background: #fcfcfd; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.nowrap { white-space: nowrap; }
.truncate { max-width: 360px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Nhãn trạng thái */
.tag { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 999px; background: #f1f5f9; color: #475569; font-size: 11px; font-weight: 700; white-space: nowrap; }
.tag.green { background: var(--green-bg); color: var(--green); }
.tag.red { background: var(--red-bg); color: var(--red); }
.tag.amber { background: var(--amber-bg); color: var(--amber); }

/* Thẻ website trên trang tổng quan */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 16px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.card.current { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(15,23,42,.08); }
.card-head { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; }
.card-title { font-size: 16px; font-weight: 800; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.stat { background: #f8fafc; border-radius: 8px; padding: 8px 10px; }
.stat strong { display: block; font-size: 18px; color: var(--dark); }
.stat span { font-size: 11px; color: var(--muted); }

/* Phân trang */
.pager { display: flex; gap: 6px; justify-content: flex-end; padding: 12px 14px; border-top: 1px solid var(--border); align-items: center; }

/* Trang đăng nhập */
.auth-box { max-width: 380px; margin: 10vh auto; }
.auth-box .logo-big { font-size: 22px; font-weight: 900; letter-spacing: .08em; margin-bottom: 4px; }

@media (max-width: 900px) {
  .topbar { flex-wrap: wrap; height: auto; padding: 8px 12px; }
  .nav > a, .nav-group > span, .nav-soon { height: 40px; }
  .dropdown { top: 40px; }
  .form-grid { grid-template-columns: 1fr; }
  .page { padding: 14px; }
  .cards { grid-template-columns: 1fr; }
}