:root {
  --bg: #0f1115;
  --panel: #1a1d24;
  --panel-2: #232730;
  --border: #2c313c;
  --text: #e6e8ee;
  --muted: #8b93a3;
  --primary: #4f7cff;
  --primary-d: #3a63db;
  --green: #2ecc71;
  --red: #ff5c5c;
  --amber: #f1b24a;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
.screen { min-height: 100vh; }
.center { display: flex; align-items: center; justify-content: center; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 18px;
}

/* Login */
.login-card { width: 340px; text-align: center; }
.login-card h1 { margin: 0 0 4px; font-size: 22px; }
.login-card input {
  width: 100%; margin: 14px 0; padding: 12px;
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-size: 15px;
}

/* App shell: sidebar + main */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 230px; flex-shrink: 0;
  background: var(--panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh;
}
.sidebar-brand {
  padding: 18px 20px; font-size: 18px; font-weight: 700;
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; flex-direction: column; padding: 12px 10px; gap: 4px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: 8px;
  color: var(--muted); text-decoration: none; font-size: 14px;
}
.nav-item:hover { background: var(--panel-2); color: var(--text); }
.nav-item.active { background: var(--primary); color: #fff; }
.nav-ico { width: 18px; text-align: center; opacity: .9; }
.sidebar-foot { padding: 12px 10px; border-top: 1px solid var(--border); display: flex; align-items: center; }
.btn.block { width: 100%; text-align: left; }
.btn.icon { padding: 7px 10px; display: inline-flex; align-items: center; justify-content: center; }
.btn.icon svg { display: block; }
.btn.icon:hover { color: var(--red); }

.main-area { flex: 1; min-width: 0; display: flex; flex-direction: column; }

/* Topbar */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 28px; background: var(--panel); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 600; font-size: 16px; }
.container { max-width: 1080px; width: 100%; margin: 24px auto; padding: 0 28px; }

/* Dashboard stats */
.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 14px; margin-bottom: 18px;
}
.stat-card { text-align: center; padding: 22px 16px; margin: 0; }
.stat-value { font-size: 30px; font-weight: 700; line-height: 1; }
.stat-label { margin-top: 8px; color: var(--muted); font-size: 13px; }

/* Buttons */
.btn {
  cursor: pointer; border: 1px solid var(--border); border-radius: 8px;
  padding: 9px 14px; font-size: 14px; background: var(--panel-2); color: var(--text);
}
.btn:hover { filter: brightness(1.15); }
.btn.primary { background: var(--primary); border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-d); }
.btn.ghost { background: transparent; }
.btn.danger { background: var(--red); border-color: var(--red); }
.btn.sm { padding: 5px 10px; font-size: 13px; }
.btn.copy-token { padding: 3px; margin-left: 6px; vertical-align: middle; line-height: 0; }
.btn.copy-token svg { width: 14px; height: 14px; }

/* Forms */
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; align-items: end; }
.grid label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.grid input[type=text], .grid input[type=datetime-local] {
  padding: 10px; background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-size: 14px;
}
.checkbox-row { flex-direction: row !important; align-items: center; color: var(--text) !important; }
.grid .btn.primary { grid-column: 1 / -1; }

.card-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.filters { display: flex; gap: 8px; }
.filters input, .filters select {
  padding: 8px 10px; background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text);
}
.filters select { cursor: pointer; }
/* Dropdown options: nền tối + chữ sáng để không bị "chữ sáng trên nền trắng" mặc định của trình duyệt. */
select option { background: var(--panel-2); color: var(--text); }
h2 { margin: 0 0 14px; font-size: 17px; }

/* Card thu gọn/mở rộng */
.card.collapsible { padding-bottom: 20px; }
.card.collapsible .card-toggle {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; user-select: none;
}
.card.collapsible .card-toggle h2 { margin: 0; }
.card.collapsible .chev { color: var(--muted); transition: transform .15s; font-size: 14px; }
.card.collapsible:not(.collapsed) .chev { transform: rotate(90deg); }
.card.collapsible.collapsed { padding-bottom: 20px; }
.card.collapsible.collapsed .card-body { display: none; }
.card.collapsible .card-body { margin-top: 14px; }

/* Table */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 11px 10px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--muted); font-weight: 500; }
td code { font-family: ui-monospace, Consolas, monospace; }

.badge { padding: 3px 9px; border-radius: 99px; font-size: 12px; font-weight: 600; }
.badge.active { background: rgba(46,204,113,.15); color: var(--green); }
.badge.disabled { background: rgba(139,147,163,.15); color: var(--muted); }
.badge.expired { background: rgba(255,92,92,.15); color: var(--red); }
.badge.used { background: rgba(241,178,74,.15); color: var(--amber); }

.row-actions { display: flex; gap: 6px; }

/* Kebab menu (nút ⋮ + dropdown thao tác) */
.btn.kebab { padding: 4px 9px; font-size: 17px; line-height: 1; }
.row-menu {
  position: fixed; z-index: 100; min-width: 130px; padding: 4px;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  box-shadow: 0 10px 28px rgba(0,0,0,.45);
  display: flex; flex-direction: column; gap: 2px;
}
.row-menu-item {
  display: flex; align-items: center; gap: 9px;
  text-align: left; background: transparent; border: none; color: var(--text);
  padding: 8px 12px; border-radius: 6px; font-size: 13px; cursor: pointer;
}
.row-menu-item svg { flex-shrink: 0; opacity: .85; }
.row-menu-item:hover { background: var(--panel); }
.row-menu-item.danger { color: var(--red); }

/* Pager */
.pager { display: flex; align-items: center; gap: 10px; margin-top: 14px; flex-wrap: wrap; font-size: 13px; }
.pager select, .pager .pager-page {
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px;
  color: var(--text); padding: 5px 8px; font-size: 13px;
}
.pager .pager-page { width: 54px; text-align: center; }
.btn.sm:disabled { opacity: .4; cursor: default; }

/* Toast */
#toasts {
  position: fixed; right: 18px; bottom: 18px; z-index: 200;
  display: flex; flex-direction: column; gap: 8px;
}
.toast {
  background: var(--panel-2); border: 1px solid var(--border); border-left: 3px solid var(--primary);
  color: var(--text); padding: 11px 14px; border-radius: 8px; font-size: 13px; max-width: 340px;
  box-shadow: 0 10px 28px rgba(0,0,0,.45); animation: toastIn .15s ease;
}
.toast.ok { border-left-color: var(--green); }
.toast.err { border-left-color: var(--red); }
.toast.hide { opacity: 0; transition: opacity .25s; }
@keyframes toastIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* Messages */
.error { color: var(--red); margin-top: 10px; font-size: 13px; min-height: 16px; }
.msg { margin-top: 10px; font-size: 13px; min-height: 16px; }
.msg.ok { color: var(--green); }
.msg.err { color: var(--red); }

/* Modal */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,.6);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.modal { width: 400px; margin: 0; }
.modal label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.modal input {
  padding: 10px; background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-size: 14px;
}
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }

@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
  .app-shell { flex-direction: column; }
  .sidebar {
    width: 100%; height: auto; position: static;
    flex-direction: row; flex-wrap: wrap; align-items: center;
  }
  .sidebar-brand { border-bottom: none; }
  .nav { flex-direction: row; flex: 1; }
  .sidebar-foot { flex-direction: row; border-top: none; }
  .btn.block { width: auto; }
}