/* ===== Nền tảng ===== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: calc(var(--header-h) + 72px); }
body {
  margin: 0; font-family: var(--font); font-size: var(--fs-md); line-height: var(--lh);
  color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, h4 { line-height: var(--lh-tight); margin: 0; font-weight: 650; letter-spacing: -0.01em; }
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
p { margin: 0; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, select, textarea { font: inherit; color: inherit; }
img, svg { display: block; max-width: 100%; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: var(--s4); top: -60px; background: var(--primary); color: var(--on-primary);
  padding: var(--s2) var(--s4); border-radius: var(--r-md); z-index: 100; }
.skip-link:focus { top: var(--s2); }
.muted { color: var(--text-2); }
.subtle { color: var(--text-3); font-size: var(--fs-sm); }
.nowrap { white-space: nowrap; }
.pre { white-space: pre-line; overflow-wrap: anywhere; }
.num { font-variant-numeric: tabular-nums; }
.stack { display: flex; flex-direction: column; gap: var(--s4); }
.stack-sm { display: flex; flex-direction: column; gap: var(--s2); }
.row { display: flex; align-items: center; gap: var(--s3); flex-wrap: wrap; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); flex-wrap: wrap; }
.grow { flex: 1 1 auto; min-width: 0; }
.hidden { display: none !important; }
.icon { width: 20px; height: 20px; flex: none; }
.icon-sm { width: 16px; height: 16px; flex: none; }

/* ===== Khung ứng dụng ===== */
.app-header {
  position: sticky; top: 0; z-index: 40; height: var(--header-h);
  background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.app-header .inner { max-width: var(--content-max); margin: 0 auto; height: 100%; display: flex; align-items: center;
  gap: var(--s4); padding: 0 var(--s6); }
.brand { display: flex; align-items: center; gap: var(--s2); font-weight: 700; font-size: 1.05rem; color: var(--text);
  white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 32px; height: 32px; border-radius: 9px; background: linear-gradient(140deg, var(--primary), #4f7dff);
  color: #fff; display: grid; place-items: center; font-weight: 800; font-size: 15px; }
.main-nav { display: flex; gap: 2px; align-items: center; flex: 1 1 auto; min-width: 0; overflow: hidden; }
.main-nav a { color: var(--text-2); padding: 8px 12px; border-radius: var(--r-md); font-weight: 550; font-size: var(--fs-sm);
  white-space: nowrap; min-height: 40px; display: inline-flex; align-items: center; gap: 6px; }
.main-nav a:hover { background: var(--surface-hover); color: var(--text); text-decoration: none; }
.main-nav a[aria-current="page"] { color: var(--primary); background: var(--primary-soft); }
.main-nav .nav-sep { width: 1px; height: 22px; background: var(--border); margin: 0 6px; }
.header-actions { display: flex; align-items: center; gap: var(--s2); }
.btn.menu-btn { display: none; }
.user-chip { display: inline-flex; align-items: center; gap: 8px; padding: 4px 10px 4px 4px; border-radius: var(--r-full);
  border: 1px solid var(--border); background: var(--surface); min-height: 40px; cursor: pointer; }
.user-chip .avatar { width: 30px; height: 30px; border-radius: 50%; background: var(--primary-soft); color: var(--primary);
  display: grid; place-items: center; font-weight: 700; font-size: 13px; }
.dropdown { position: relative; }
.dropdown-menu { position: absolute; right: 0; top: calc(100% + 6px); min-width: 230px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--r-lg); box-shadow: var(--shadow-3); padding: var(--s2); z-index: 60; }
.dropdown-menu button, .dropdown-menu a { width: 100%; display: flex; align-items: center; gap: 10px; text-align: left;
  background: none; border: 0; padding: 10px 12px; border-radius: var(--r-md); cursor: pointer; color: var(--text);
  min-height: var(--tap); font-size: var(--fs-sm); }
.dropdown-menu button:hover, .dropdown-menu a:hover { background: var(--surface-hover); text-decoration: none; }
.dropdown-menu .menu-head { padding: 8px 12px 10px; border-bottom: 1px solid var(--border); margin-bottom: 6px; }

.page { max-width: var(--content-max); margin: 0 auto; padding: var(--s8) var(--s6) var(--s12); }
.page-narrow { max-width: 880px; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--s4); flex-wrap: wrap;
  margin-bottom: var(--s6); }
.page-head .lead { color: var(--text-2); margin-top: 6px; max-width: 64ch; }
.crumbs { font-size: var(--fs-sm); color: var(--text-3); margin-bottom: var(--s2); display: flex; gap: 6px; flex-wrap: wrap; }

/* Ngăn kéo điều hướng mobile */
.nav-drawer { position: fixed; inset: 0; z-index: 80; display: none; }
.nav-drawer.open { display: block; }
.nav-drawer .scrim { position: absolute; inset: 0; background: rgba(8, 12, 20, .5); }
.nav-drawer .panel { position: absolute; left: 0; top: 0; bottom: 0; width: min(320px, 86vw); background: var(--surface);
  padding: var(--s4); display: flex; flex-direction: column; gap: 2px; overflow-y: auto; box-shadow: var(--shadow-3);
  animation: slideIn var(--t) var(--ease); }
.nav-drawer .panel a { padding: 12px 14px; border-radius: var(--r-md); color: var(--text); font-weight: 550; min-height: var(--tap);
  display: flex; align-items: center; gap: 10px; }
.nav-drawer .panel a[aria-current="page"] { background: var(--primary-soft); color: var(--primary); }
.nav-drawer .group-label { font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: .06em; color: var(--text-3);
  padding: 14px 14px 6px; }
@keyframes slideIn { from { transform: translateX(-16px); opacity: 0; } to { transform: none; opacity: 1; } }

/* ===== Nút ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: var(--tap);
  padding: 0 18px; border-radius: var(--r-md); border: 1px solid transparent; font-weight: 600; font-size: var(--fs-sm);
  cursor: pointer; white-space: nowrap; transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast),
  box-shadow var(--t-fast), transform var(--t-fast); text-decoration: none; user-select: none; }
.btn:hover { text-decoration: none; }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled, .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: var(--on-primary); box-shadow: 0 1px 2px rgba(36, 88, 214, .3); }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-secondary:hover:not(:disabled) { background: var(--surface-hover); }
.btn-ghost { background: transparent; color: var(--text-2); }
.btn-ghost:hover:not(:disabled) { background: var(--surface-hover); color: var(--text); }
.btn-soft { background: var(--primary-soft); color: var(--primary); }
.btn-soft:hover:not(:disabled) { background: var(--primary-soft-2); }
.btn-danger { background: var(--danger-strong); color: #fff; }
.btn-danger:hover:not(:disabled) { background: var(--danger); }
.btn-danger-ghost { background: transparent; color: var(--danger); border-color: var(--danger-border); }
.btn-danger-ghost:hover:not(:disabled) { background: var(--danger-soft); }
.btn-success { background: var(--success-strong); color: #fff; }
.btn-lg { min-height: 52px; padding: 0 24px; font-size: var(--fs-md); border-radius: var(--r-lg); }
.btn-sm { min-height: 36px; padding: 0 12px; font-size: var(--fs-sm); }
.btn-icon { width: var(--tap); padding: 0; }
.btn-block { width: 100%; }
.btn.is-on.flag { background: var(--warning-soft); border-color: var(--warning-border); color: var(--warning); }
.btn.is-on.save { background: var(--primary-soft); border-color: var(--primary-soft-2); color: var(--primary); }
.disabled-reason { font-size: var(--fs-sm); color: var(--text-3); margin-top: 6px; }

/* ===== Biểu mẫu ===== */
.field { display: flex; flex-direction: column; gap: 6px; }
.field > label, .field-label { font-weight: 600; font-size: var(--fs-sm); color: var(--text); }
.field .hint { font-size: var(--fs-sm); color: var(--text-2); }  /* text-2: đủ tương phản AA trên nền thẻ (F-04) */
.field .error { font-size: var(--fs-sm); color: var(--danger); display: flex; gap: 6px; align-items: flex-start; }
.input, .select, .textarea { width: 100%; min-height: var(--tap); border: 1px solid var(--border-strong); border-radius: var(--r-md);
  background: var(--surface); padding: 10px 12px; font-size: var(--fs-md); transition: border-color var(--t-fast), box-shadow var(--t-fast); }
.textarea { min-height: 96px; resize: vertical; line-height: var(--lh-read); }
.input:focus, .select:focus, .textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft-2); }
.input[aria-invalid="true"], .textarea[aria-invalid="true"] { border-color: var(--danger); }
.search { position: relative; }
.search .icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-3); }
.search .input { padding-left: 40px; }
.check { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; min-height: var(--tap); padding: 8px 0; }
.check input { width: 20px; height: 20px; margin: 2px 0 0; accent-color: var(--primary); flex: none; }

/* Nhóm lựa chọn dạng phân đoạn */
.segmented { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; background: var(--bg-sunken); border-radius: var(--r-md);
  padding: 4px; gap: 4px; }
.segmented label { position: relative; }
.segmented input { position: absolute; opacity: 0; inset: 0; }
.segmented span { display: flex; align-items: center; justify-content: center; gap: 6px; min-height: 40px; border-radius: 8px;
  font-weight: 600; font-size: var(--fs-sm); color: var(--text-2); cursor: pointer; padding: 0 10px; text-align: center; }
.segmented input:checked + span { background: var(--surface); color: var(--text); box-shadow: var(--shadow-1); }
.segmented input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 1px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 0 14px; border-radius: var(--r-full);
  border: 1px solid var(--border-strong); background: var(--surface); font-size: var(--fs-sm); font-weight: 550; cursor: pointer;
  color: var(--text-2); }
.chip:hover { background: var(--surface-hover); }
.chip[aria-pressed="true"], .chip.is-active { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }
label.chip { position: relative; }
label.chip input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
label.chip:has(input:checked) { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }
label.chip:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 2px; }

.choice-list { display: flex; flex-direction: column; gap: 8px; }
.choice { display: flex; gap: 12px; align-items: flex-start; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--r-md);
  cursor: pointer; background: var(--surface); transition: border-color var(--t-fast), background var(--t-fast); }
.choice:hover { border-color: var(--border-strong); }
.choice input { margin-top: 3px; width: 18px; height: 18px; accent-color: var(--primary); flex: none; }
.choice:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); }
.choice:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 2px; }
.choice .t { font-weight: 600; font-size: var(--fs-sm); }
.choice .d { font-size: var(--fs-sm); color: var(--text-3); }
.choice .count { margin-left: auto; font-size: var(--fs-sm); color: var(--text-3); font-variant-numeric: tabular-nums; }

.switch { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); min-height: var(--tap); cursor: pointer; }
.switch input { appearance: none; width: 44px; height: 26px; border-radius: 999px; background: var(--border-strong); position: relative;
  cursor: pointer; flex: none; transition: background var(--t-fast); }
.switch input::after { content: ""; position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; border-radius: 50%;
  background: #fff; box-shadow: var(--shadow-1); transition: transform var(--t-fast) var(--ease); }
.switch input:checked { background: var(--primary); }
.switch input:checked::after { transform: translateX(18px); }
.switch .t { font-size: var(--fs-sm); font-weight: 550; }
.switch .d { font-size: var(--fs-xs); color: var(--text-3); }

/* ===== Thẻ, nhãn ===== */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); box-shadow: var(--shadow-1); }
.card-pad { padding: var(--s6); }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); padding: var(--s5) var(--s6);
  border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.card-body { padding: var(--s5) var(--s6); }
.section-title { font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: .06em; color: var(--text-3); font-weight: 650; }
.badge { display: inline-flex; align-items: center; gap: 5px; padding: 2px 9px; border-radius: var(--r-full); font-size: var(--fs-xs);
  font-weight: 650; line-height: 1.6; white-space: nowrap; border: 1px solid transparent; }
.badge-neutral { background: var(--bg-sunken); color: var(--text-2); }
.badge-primary { background: var(--primary-soft); color: var(--primary); }
.badge-success { background: var(--success-soft); color: var(--success); border-color: var(--success-border); }
.badge-danger { background: var(--danger-soft); color: var(--danger); border-color: var(--danger-border); }
.badge-warning { background: var(--warning-soft); color: var(--warning); border-color: var(--warning-border); }
.badge-outline { border-color: var(--border-strong); color: var(--text-2); }

.alert { display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border-radius: var(--r-md); border: 1px solid;
  font-size: var(--fs-sm); line-height: 1.55; }
.alert .icon { margin-top: 1px; }
.alert-info { background: var(--primary-soft); border-color: var(--primary-soft-2); color: var(--text); }
.alert-info .icon { color: var(--primary); }
.alert-warning { background: var(--warning-soft); border-color: var(--warning-border); color: var(--text); }
.alert-warning .icon { color: var(--warning); }
.alert-danger { background: var(--danger-soft); border-color: var(--danger-border); color: var(--text); }
.alert-danger .icon { color: var(--danger); }
.alert-success { background: var(--success-soft); border-color: var(--success-border); color: var(--text); }
.alert-success .icon { color: var(--success); }

.progress { height: 8px; border-radius: var(--r-full); background: var(--bg-sunken); overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--primary); border-radius: inherit; transition: width var(--t) var(--ease); }
.progress.success > span { background: var(--success-strong); }
.stackbar { display: flex; height: 10px; border-radius: var(--r-full); overflow: hidden; background: var(--bg-sunken); }
.stackbar .c { background: var(--success-strong); }
.stackbar .w { background: var(--danger-strong); }
.stackbar .b { background: var(--border-strong); }

/* ===== Trạng thái chung ===== */
.state { text-align: center; padding: var(--s12) var(--s6); display: flex; flex-direction: column; align-items: center; gap: var(--s3); }
.state .art { width: 64px; height: 64px; border-radius: 18px; display: grid; place-items: center; background: var(--primary-soft);
  color: var(--primary); margin-bottom: var(--s2); }
.state .art .icon { width: 30px; height: 30px; }
.state.error .art { background: var(--danger-soft); color: var(--danger); }
.state h2 { font-size: var(--fs-lg); }
.state p { color: var(--text-2); max-width: 52ch; }
.skeleton { background: linear-gradient(90deg, var(--bg-sunken) 25%, var(--surface-hover) 37%, var(--bg-sunken) 63%);
  background-size: 400% 100%; animation: shimmer 1.4s ease infinite; border-radius: var(--r-md); }
@keyframes shimmer { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2px solid currentColor; border-right-color: transparent;
  animation: spin .8s linear infinite; display: inline-block; flex: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Hộp thoại & thông báo ===== */
.modal-root { position: fixed; inset: 0; z-index: 90; display: grid; place-items: center; padding: var(--s4); }
.modal-root .scrim { position: absolute; inset: 0; background: rgba(8, 12, 20, .55); animation: fade var(--t) var(--ease); }
.modal { position: relative; background: var(--surface); border-radius: var(--r-xl); box-shadow: var(--shadow-3); width: min(560px, 100%);
  max-height: calc(100vh - 32px); overflow: auto; animation: pop var(--t) var(--ease); border: 1px solid var(--border); }
.modal.wide { width: min(820px, 100%); }
.modal-head { padding: var(--s6) var(--s6) var(--s2); }
.modal-head p { color: var(--text-2); margin-top: 8px; }
.modal-body { padding: var(--s3) var(--s6); }
.modal-foot { padding: var(--s4) var(--s6) var(--s6); display: flex; gap: var(--s3); justify-content: flex-end; flex-wrap: wrap; }
@keyframes fade { from { opacity: 0; } }
@keyframes pop { from { opacity: 0; transform: translateY(8px) scale(.98); } }
.toast-region { position: fixed; z-index: 95; right: var(--s4); bottom: var(--s4); display: flex; flex-direction: column; gap: 10px;
  width: min(420px, calc(100vw - 32px)); pointer-events: none; }
.toast { pointer-events: auto; display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border-radius: var(--r-md);
  background: var(--text); color: var(--text-inverse); box-shadow: var(--shadow-3); font-size: var(--fs-sm); animation: pop var(--t) var(--ease); }
.toast.error { background: var(--danger); color: #fff; }
.toast.success .icon { color: var(--success-strong); }
.toast .close { margin-left: auto; background: none; border: 0; color: inherit; opacity: .7; cursor: pointer; padding: 0 0 0 8px; }
.kbd { font-family: var(--font-mono); font-size: 12px; padding: 1px 6px; border-radius: 5px; border: 1px solid var(--border-strong);
  background: var(--surface-2); color: var(--text-2); }

/* ===== Bảng ===== */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--surface); }
table.table { width: 100%; border-collapse: collapse; font-size: var(--fs-sm); }
.table th { text-align: left; font-weight: 650; color: var(--text-2); background: var(--surface-2); padding: 12px 14px;
  border-bottom: 1px solid var(--border); white-space: nowrap; font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: .04em; }
.table td { padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
.table tr:last-child td { border-bottom: 0; }
.table tr.clickable { cursor: pointer; }
.table tr.clickable:hover td { background: var(--surface-hover); }
.pager { display: flex; justify-content: space-between; align-items: center; gap: var(--s3); margin-top: var(--s4); flex-wrap: wrap; }

/* ===== Đăng nhập ===== */
.auth-wrap { min-height: 100vh; display: grid; grid-template-columns: 1.1fr 1fr; }
.auth-art { background: radial-gradient(1200px 600px at 10% 10%, #3d6cf0 0%, #1d3fa8 55%, #122a73 100%); color: #fff;
  padding: var(--s12); display: flex; flex-direction: column; justify-content: space-between; }
.auth-art h1 { font-size: 2.4rem; max-width: 16ch; line-height: 1.2; }
.auth-art p { opacity: .85; max-width: 44ch; margin-top: var(--s4); font-size: var(--fs-lg); }
.auth-art ul { list-style: none; padding: 0; margin: var(--s8) 0 0; display: grid; gap: 14px; }
.auth-art li { display: flex; gap: 12px; align-items: center; opacity: .92; }
.auth-art li .dot { width: 28px; height: 28px; border-radius: 8px; background: rgba(255,255,255,.14); display: grid; place-items: center; }
.auth-form { display: grid; place-items: center; padding: var(--s8) var(--s6); }
.auth-card { width: min(420px, 100%); }
.auth-card h2 { font-size: var(--fs-2xl); margin-bottom: 6px; }

/* ===== Tổng quan ===== */
.dash-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: var(--s6); align-items: start; }
.continue-card { padding: var(--s6); display: flex; gap: var(--s6); align-items: center; flex-wrap: wrap;
  background: linear-gradient(135deg, var(--primary-soft), var(--surface) 70%); border-color: var(--primary-soft-2); }
.continue-card .meta { flex: 1 1 260px; min-width: 0; }
.continue-card h2 { font-size: var(--fs-xl); margin: 6px 0 10px; }
.hero-start { padding: var(--s8) var(--s6); display: flex; flex-direction: column; gap: var(--s4); align-items: flex-start; }
.hero-start h2 { font-size: var(--fs-2xl); max-width: 22ch; }
.kpis { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--border); border-radius: var(--r-lg);
  overflow: hidden; border: 1px solid var(--border); }
.kpi { background: var(--surface); padding: var(--s5); display: flex; flex-direction: column; gap: 4px; }
.kpi .v { font-size: var(--fs-2xl); font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.kpi .l { font-weight: 600; font-size: var(--fs-sm); }
.kpi .h { font-size: var(--fs-xs); color: var(--text-3); }
.set-mini { display: flex; flex-direction: column; gap: 10px; padding: var(--s5); }
.set-mini + .set-mini { border-top: 1px solid var(--border); }

/* ===== Chọn bộ đề ===== */
.sets-layout { display: grid; grid-template-columns: minmax(0, 2fr) minmax(320px, 1fr); gap: var(--s6); align-items: start; }
.toolbar { display: flex; gap: var(--s3); flex-wrap: wrap; align-items: center; margin-bottom: var(--s4); }
.toolbar .search { flex: 1 1 260px; }
.set-list { display: flex; flex-direction: column; gap: var(--s3); }
.set-card { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--s4); padding: var(--s5); cursor: pointer;
  transition: border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast); position: relative; }
.set-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-2); }
.set-card.selected { border-color: var(--primary); background: color-mix(in srgb, var(--primary-soft) 55%, var(--surface)); }
.set-card input[type=checkbox] { width: 22px; height: 22px; margin: 2px 0 0; accent-color: var(--primary); cursor: pointer; }
.set-card h3 { font-size: var(--fs-md); font-weight: 650; }
.set-card .facts { display: flex; gap: var(--s4); flex-wrap: wrap; font-size: var(--fs-sm); color: var(--text-2); }
.set-card .facts > span { display: inline-flex; align-items: center; gap: 4px; }
.set-card .facts b { color: var(--text); font-variant-numeric: tabular-nums; }
.config { position: sticky; top: calc(var(--header-h) + var(--s4)); }
.config .card-body { display: flex; flex-direction: column; gap: var(--s5); }
.config .group { display: flex; flex-direction: column; gap: 10px; }
.eligible-box { border-radius: var(--r-md); padding: var(--s4); background: var(--surface-2); border: 1px solid var(--border); }
.eligible-box.is-loading { opacity: .55; transition: opacity var(--t); }
.eligible-box .big { font-size: var(--fs-xl); font-weight: 700; font-variant-numeric: tabular-nums; }
.selected-sets { display: flex; flex-wrap: wrap; gap: 6px; }
details.advanced summary { cursor: pointer; font-weight: 600; font-size: var(--fs-sm); color: var(--text-2); min-height: var(--tap);
  display: flex; align-items: center; gap: 6px; }
details.advanced[open] summary { margin-bottom: var(--s3); }

/* ===== Làm bài ===== */
.runner { display: grid; grid-template-columns: minmax(0, 3fr) minmax(280px, 1fr); gap: var(--s6); align-items: start; }
.runner-top { position: sticky; top: var(--header-h); z-index: 30; background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.runner-top .inner { max-width: var(--content-max); margin: 0 auto; padding: 10px var(--s6); display: flex; align-items: center;
  gap: var(--s4); flex-wrap: wrap; }
.runner-top .title { font-weight: 650; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1 1 200px; }
.timer { display: inline-flex; align-items: center; gap: 8px; font-variant-numeric: tabular-nums; font-weight: 650;
  padding: 6px 12px; border-radius: var(--r-full); background: var(--surface); border: 1px solid var(--border); font-size: var(--fs-sm); }
.timer.low { background: var(--warning-soft); border-color: var(--warning-border); color: var(--warning); }
.sync { display: inline-flex; align-items: center; gap: 6px; font-size: var(--fs-sm); color: var(--text-3); min-width: 110px; }
.sync .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success-strong); }
.sync.saving .dot { background: var(--primary); animation: pulse 1s ease infinite; }
.sync.offline { color: var(--danger); }
.sync.offline .dot { background: var(--danger-strong); }
@keyframes pulse { 50% { opacity: .3; } }
.q-card { padding: var(--s8); }
.q-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: var(--s4); font-size: var(--fs-sm); color: var(--text-3); }
.q-number { font-weight: 700; color: var(--primary); font-size: var(--fs-sm); }
.q-stem { font-size: var(--fs-question); line-height: var(--lh-read); white-space: pre-line; overflow-wrap: anywhere; font-weight: 500; }
.options { display: flex; flex-direction: column; gap: 10px; margin-top: var(--s6); border: 0; padding: 0; }
.option { position: relative; display: grid; grid-template-columns: 36px minmax(0, 1fr) auto; gap: 14px; align-items: start;
  padding: 14px 16px; border: 1.5px solid var(--border); border-radius: var(--r-lg); background: var(--surface); cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast); min-height: 56px; }
.option:hover { border-color: var(--border-strong); background: var(--surface-2); }
.option input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.option .letter { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font-weight: 700;
  background: var(--bg-sunken); color: var(--text-2); font-size: var(--fs-sm); border: 1.5px solid transparent; }
.option .text { font-size: var(--fs-question); line-height: var(--lh-read); white-space: pre-line; overflow-wrap: anywhere; padding-top: 2px; }
.option .mark { align-self: center; display: inline-flex; align-items: center; gap: 6px; font-size: var(--fs-sm); font-weight: 650; }
.option:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); }
.option:has(input:checked) .letter { background: var(--primary); color: var(--on-primary); }
.option:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 2px; }
.option.is-correct, .option.is-correct:has(input:checked) { border-color: var(--success-strong); background: var(--success-soft); }
.option.is-correct .letter, .option.is-correct:has(input:checked) .letter { background: var(--success-strong); color: #fff; }
.option.is-correct .mark { color: var(--success); }
.option.is-wrong, .option.is-wrong:has(input:checked) { border-color: var(--danger-strong); background: var(--danger-soft); }
.option.is-wrong .letter, .option.is-wrong:has(input:checked) .letter { background: var(--danger-strong); color: #fff; }
.option.is-wrong .mark { color: var(--danger); }
.option.is-locked { cursor: default; }
.option.is-locked:hover { background: inherit; }
.option.is-dim { opacity: .75; }
.explain { margin-top: var(--s6); border-radius: var(--r-lg); padding: var(--s5); background: var(--surface-2); border: 1px solid var(--border); }
.explain h3 { font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: .05em; color: var(--text-2); margin-bottom: 8px; }
.explain .body { font-size: var(--fs-md); line-height: var(--lh-read); white-space: pre-line; overflow-wrap: anywhere; }
.verdict { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: var(--fs-lg); margin-top: var(--s5); }
.verdict.correct { color: var(--success); }
.verdict.wrong { color: var(--danger); }
.q-actions { display: flex; align-items: center; gap: var(--s3); flex-wrap: wrap; margin-top: var(--s6); padding-top: var(--s5);
  border-top: 1px solid var(--border); }
.q-actions .spacer { flex: 1 1 auto; }
.nav-panel { position: sticky; top: calc(var(--header-h) + 72px); }
.nav-panel .card-body { display: flex; flex-direction: column; gap: var(--s4); }
.qgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(42px, 1fr)); gap: 6px; max-height: 44vh; overflow-y: auto;
  padding: 2px; }
.qcell { position: relative; height: 42px; border-radius: 9px; border: 1.5px solid var(--border); background: var(--surface);
  font-weight: 650; font-size: var(--fs-sm); cursor: pointer; font-variant-numeric: tabular-nums; color: var(--text-2); }
.qcell:hover { border-color: var(--border-strong); }
.qcell.answered { background: var(--primary-soft); border-color: var(--primary-soft-2); color: var(--primary); }
.qcell.correct { background: var(--success-soft); border-color: var(--success-border); color: var(--success); }
.qcell.wrong { background: var(--danger-soft); border-color: var(--danger-border); color: var(--danger); }
.qcell.current { outline: 2.5px solid var(--primary); outline-offset: 1px; }
.qcell.flagged::after { content: ""; position: absolute; top: -4px; right: -4px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--warning-strong); border: 2px solid var(--surface); }
.legend { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 12px; font-size: var(--fs-xs); color: var(--text-2); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 14px; height: 14px; border-radius: 4px; border: 1.5px solid var(--border); display: inline-block; flex: none; }
.legend i.answered { background: var(--primary-soft); border-color: var(--primary-soft-2); }
.legend i.correct { background: var(--success-soft); border-color: var(--success-border); }
.legend i.wrong { background: var(--danger-soft); border-color: var(--danger-border); }
.legend i.flag { background: var(--warning-strong); border-radius: 50%; border-color: var(--warning-strong); width: 10px; height: 10px; }
.count-row { display: flex; justify-content: space-between; font-size: var(--fs-sm); }
.count-row b { font-variant-numeric: tabular-nums; }
.mobile-bar { display: none; }
.banner { display: flex; gap: var(--s3); align-items: center; flex-wrap: wrap; padding: 12px var(--s4); border-radius: var(--r-md);
  margin-bottom: var(--s4); }
.shortcut-hint { font-size: var(--fs-xs); color: var(--text-3); display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* ===== Kết quả ===== */
.result-hero { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--s8); align-items: center; padding: var(--s8); }
.score-ring { width: 168px; height: 168px; position: relative; }
.score-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.score-ring .val { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; }
.score-ring .val b { font-size: 2.4rem; font-weight: 750; letter-spacing: -0.03em; display: block; line-height: 1; }
.score-ring .val span { font-size: var(--fs-sm); color: var(--text-2); }
.tally { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s3); margin-top: var(--s5); }
.tally .t { border-radius: var(--r-md); padding: 12px 14px; border: 1px solid var(--border); background: var(--surface-2); }
.tally .t b { font-size: var(--fs-xl); font-variant-numeric: tabular-nums; display: flex; align-items: center; gap: 8px; }
.tally .t span { font-size: var(--fs-sm); color: var(--text-2); }
.tally .t.c b { color: var(--success); }
.tally .t.w b { color: var(--danger); }
.tally .t.b b { color: var(--text-2); }
.metrics { display: flex; gap: var(--s6); flex-wrap: wrap; margin-top: var(--s4); font-size: var(--fs-sm); color: var(--text-2); }
.metrics b { color: var(--text); font-variant-numeric: tabular-nums; }
.next-actions { display: flex; gap: var(--s3); flex-wrap: wrap; margin-top: var(--s6); }
.review-item { padding: var(--s6); }
.review-item + .review-item { border-top: 1px solid var(--border); }
.review-item .options { margin-top: var(--s4); }
.review-item .option { cursor: default; }
.breakdown-row { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) auto; gap: var(--s4); align-items: center;
  padding: 12px 0; border-bottom: 1px solid var(--border); font-size: var(--fs-sm); }
.breakdown-row:last-child { border-bottom: 0; }

/* ===== Nhập Word (quản trị) ===== */
.stepper { display: flex; gap: 0; counter-reset: step; margin-bottom: var(--s6); flex-wrap: wrap; }
.stepper li { list-style: none; display: flex; align-items: center; gap: 10px; color: var(--text-3); font-weight: 600; font-size: var(--fs-sm);
  padding: 8px 14px 8px 0; }
.stepper li::before { counter-increment: step; content: counter(step); width: 28px; height: 28px; border-radius: 50%; display: grid;
  place-items: center; border: 1.5px solid var(--border-strong); font-size: var(--fs-sm); }
.stepper li:not(:last-child)::after { content: ""; width: 32px; height: 2px; background: var(--border); margin-left: 6px; }
.stepper li.done { color: var(--text-2); }
.stepper li.done::before { background: var(--success-strong); border-color: var(--success-strong); color: #fff; content: "✓"; }
.stepper li.active { color: var(--primary); }
.stepper li.active::before { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }
.dropzone { border: 2px dashed var(--border-strong); border-radius: var(--r-lg); padding: var(--s8); text-align: center; background: var(--surface-2);
  cursor: pointer; transition: border-color var(--t-fast), background var(--t-fast); }
.dropzone.drag { border-color: var(--primary); background: var(--primary-soft); }
.dropzone .icon { width: 36px; height: 36px; margin: 0 auto var(--s3); color: var(--primary); }
.stat-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 1px; background: var(--border);
  border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; }
.stat-strip div { background: var(--surface); padding: 14px 16px; }
.stat-strip b { display: block; font-size: var(--fs-xl); font-variant-numeric: tabular-nums; }
.stat-strip span { font-size: var(--fs-xs); color: var(--text-3); }
.review-layout { display: grid; grid-template-columns: 300px minmax(0, 1fr) minmax(0, 1.15fr); gap: var(--s4); align-items: start; }
.item-list { max-height: calc(100vh - 260px); overflow-y: auto; }
.item-row { display: flex; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--border); cursor: pointer; align-items: flex-start;
  background: none; border-left: 0; border-right: 0; border-top: 0; width: 100%; text-align: left; font-size: var(--fs-sm); color: var(--text); }
.item-row:hover { background: var(--surface-hover); }
.item-row[aria-current="true"] { background: var(--primary-soft); box-shadow: inset 3px 0 0 var(--primary); }
.item-row .n { font-weight: 700; min-width: 34px; font-variant-numeric: tabular-nums; color: var(--text-2); }
.item-row .p { color: var(--text-2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.src-block { font-size: var(--fs-sm); line-height: 1.6; padding: 8px 10px; border-left: 3px solid var(--border); margin-bottom: 6px;
  border-radius: 0 6px 6px 0; background: var(--surface-2); white-space: pre-line; overflow-wrap: anywhere; }
.src-block .role { display: block; font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-3); margin-bottom: 2px; }
.src-block.r-question { border-left-color: var(--primary); }
.src-block.r-option, .src-block.r-option_label { border-left-color: var(--border-strong); }
.src-block.r-answer, .src-block.r-explanation { border-left-color: var(--success-strong); }
.src-block.r-editorial_note, .src-block.r-unclassified { border-left-color: var(--warning-strong); background: var(--warning-soft); }
.src-block.r-trailer, .src-block.r-empty { opacity: .6; }
.src-run-b { font-weight: 700; }
.issue { border: 1px solid var(--border); border-radius: var(--r-md); padding: 12px 14px; display: flex; flex-direction: column; gap: 8px;
  font-size: var(--fs-sm); }
.issue.blocking { border-color: var(--danger-border); background: var(--danger-soft); }
.issue.warning { border-color: var(--warning-border); background: var(--warning-soft); }
.issue.resolved { opacity: .7; background: var(--surface-2); border-color: var(--border); }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: var(--s4); overflow-x: auto; }
.tabs button { background: none; border: 0; padding: 10px 14px; font-weight: 600; font-size: var(--fs-sm); color: var(--text-2); cursor: pointer;
  border-bottom: 2px solid transparent; margin-bottom: -1px; white-space: nowrap; min-height: var(--tap); }
.tabs button[aria-selected="true"] { color: var(--primary); border-bottom-color: var(--primary); }
.opt-edit { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; align-items: start; }
.opt-edit .radio-lbl { display: flex; align-items: center; gap: 8px; font-weight: 700; min-height: var(--tap); cursor: pointer; }
.opt-edit input[type=radio] { width: 20px; height: 20px; accent-color: var(--success-strong); }
.split-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s4); }
.kv { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 6px 16px; font-size: var(--fs-sm); }
.kv dt { color: var(--text-3); }
.kv dd { margin: 0; }
.temp-pass { font-family: var(--font-mono); font-size: var(--fs-lg); padding: 12px 16px; border-radius: var(--r-md); background: var(--surface-2);
  border: 1px dashed var(--border-strong); user-select: all; word-break: break-all; }

/* ===== Responsive ===== */
@media (max-width: 1199px) {
  .review-layout { grid-template-columns: 260px minmax(0, 1fr); }
  .review-layout .pane-source { grid-column: 2; }
  .review-layout .pane-edit { grid-column: 2; }
}
@media (max-width: 1100px) {
  .main-nav { display: none; }
  .btn.menu-btn { display: inline-flex; }
  .runner { grid-template-columns: minmax(0, 1fr) 260px; gap: var(--s4); }
}
@media (max-width: 1023px) {
  .sets-layout { grid-template-columns: minmax(0, 1fr); }
  .config { position: static; }
  .dash-grid { grid-template-columns: minmax(0, 1fr); }
  .runner { grid-template-columns: minmax(0, 1fr); }
  .nav-panel { display: none; }
  .nav-panel.drawer-open { display: block; position: fixed; inset: auto 0 0 0; top: auto; z-index: 85; max-height: 80vh;
    overflow-y: auto; border-radius: var(--r-xl) var(--r-xl) 0 0; box-shadow: var(--shadow-3); animation: up var(--t) var(--ease);
    padding-bottom: env(safe-area-inset-bottom); }
  .nav-panel.drawer-open .qgrid { max-height: 38vh; }
  .drawer-scrim { position: fixed; inset: 0; background: rgba(8, 12, 20, .5); z-index: 84; }
  .mobile-bar { display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 50; gap: 8px; padding: 10px 12px;
    padding-bottom: calc(10px + env(safe-area-inset-bottom)); background: var(--surface); border-top: 1px solid var(--border);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, .06); }
  .mobile-bar .btn { flex: 1 1 0; padding: 0 10px; }
  .mobile-bar .btn-icon { flex: 0 0 var(--tap); }
  /* Trước / Xác nhận / Sau đã có trên thanh cố định → không lặp lại trong thẻ (cùng mốc 1023px với .mobile-bar). */
  .q-actions .nav-dup { display: none; }
  .q-actions .spacer { display: none; }
  .runner-page { padding-bottom: 96px; }
  .review-layout { grid-template-columns: minmax(0, 1fr); }
  .review-layout .pane-source, .review-layout .pane-edit { grid-column: 1; }
  .item-list { max-height: 320px; }
  .review-layout.mobile-tabs .pane { display: none; }
  .review-layout.mobile-tabs .pane.active { display: block; }
}
@keyframes up { from { transform: translateY(24px); opacity: 0; } }
@media (min-width: 1024px) { .only-mobile { display: none !important; } }
@media (max-width: 1023px) { .only-desktop { display: none !important; } }
@media (max-width: 767px) {
  .page { padding: var(--s5) var(--s4) var(--s10); }
  .app-header .inner { padding: 0 var(--s4); gap: var(--s2); }
  /* Ẩn tên về mặt hình ảnh nhưng giữ trong cây trợ năng để nút vẫn có tên đọc được. */
  .user-chip .name { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .auth-wrap { grid-template-columns: 1fr; }
  .auth-art { display: none; }
  .q-card { padding: var(--s5); }
  .option { grid-template-columns: 32px minmax(0, 1fr); padding: 12px; gap: 12px; }
  .option .mark { grid-column: 2; }
  .option .letter { width: 30px; height: 30px; }
  .result-hero { grid-template-columns: 1fr; justify-items: center; text-align: center; padding: var(--s6) var(--s4); }
  .result-hero .next-actions, .result-hero .metrics { justify-content: center; }
  .tally { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card-pad, .card-body { padding: var(--s4); }
  .card-head { padding: var(--s4); }
  .split-2 { grid-template-columns: 1fr; }
  .modal-foot { flex-direction: column-reverse; }
  .modal-foot .btn { width: 100%; }
  .runner-top .inner { padding: 8px var(--s4); gap: var(--s2); }
  .runner-top .title { flex-basis: 100%; font-size: var(--fs-sm); }
  .breakdown-row { grid-template-columns: minmax(0, 1fr) auto; }
  .breakdown-row .stackbar { grid-column: 1 / -1; }
  .page-head h1 { font-size: var(--fs-xl); }
  .hide-sm { display: none !important; }
}

/* ===== Đối chiếu cạnh nhau (hàng chờ nội dung) ===== */
.compare-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--s4); align-items: start; }
.compare-grid .card { background: var(--surface-2); }
.compare-grid .card:first-child { border-color: var(--primary); }

/* ===== Nút lên đầu trang ===== */
.to-top { position: fixed; right: 16px; bottom: calc(16px + env(safe-area-inset-bottom)); z-index: 45; width: var(--tap); height: var(--tap);
  border-radius: 50%; border: 1px solid var(--border-strong); background: var(--surface); color: var(--text-2); box-shadow: var(--shadow-2);
  display: grid; place-items: center; cursor: pointer; }
.to-top svg { transform: rotate(180deg); }
.to-top:hover { color: var(--primary); border-color: var(--primary); }
.to-top[hidden] { display: none; }

/* ===== Ảnh trong nội dung ===== */
.q-img-btn { display: inline-block; vertical-align: middle; margin: 6px 4px; padding: 3px; border-radius: var(--r-md);
  border: 1px solid var(--border); background: var(--surface); cursor: zoom-in; max-width: 100%; }
.q-img-btn:hover { border-color: var(--primary); }
.q-img { max-width: min(100%, 520px); max-height: 320px; min-width: 48px; min-height: 32px; border-radius: 6px; object-fit: contain; background: #fff; }
.option .q-img { max-height: 180px; }
.lightbox-stage { overflow: auto; max-height: 70vh; display: grid; place-items: center; background: var(--bg-sunken); border-radius: var(--r-md);
  padding: var(--s4); touch-action: pinch-zoom; }
.lightbox-img { max-width: 100%; transform-origin: center; transition: transform var(--t) var(--ease); background: #fff; }

/* ===== Khu vực quản trị: thanh bên ===== */
.admin-shell { max-width: var(--content-max); margin: 0 auto; display: grid; grid-template-columns: 236px minmax(0, 1fr); gap: 0; }
.admin-side { position: sticky; top: var(--header-h); align-self: start; height: calc(100vh - var(--header-h)); overflow-y: auto;
  padding: var(--s6) var(--s3) var(--s6) var(--s6); border-right: 1px solid var(--border); }
.admin-side .side-title { font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: .06em; color: var(--text-3); padding: 0 10px 8px; }
.admin-side a { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: var(--r-md); color: var(--text-2); font-weight: 550;
  font-size: var(--fs-sm); min-height: 40px; }
.admin-side a:hover { background: var(--surface-hover); color: var(--text); text-decoration: none; }
.admin-side a[aria-current="page"] { background: var(--primary-soft); color: var(--primary); }
.admin-side .count { margin-left: auto; background: var(--danger-strong); color: #fff; border-radius: 999px; font-size: 11px; padding: 1px 7px; }
.admin-main > .page { max-width: none; }
.admin-mobile-nav { display: none; }
.admin-tabs-legacy { display: none; }
.task-list { display: flex; flex-direction: column; }
.task { display: flex; align-items: center; gap: var(--s4); padding: var(--s4) var(--s5); border-bottom: 1px solid var(--border); color: var(--text); }
.task:last-child { border-bottom: 0; }
.task:hover { background: var(--surface-hover); text-decoration: none; }
.task .n { font-size: var(--fs-xl); font-weight: 700; min-width: 48px; font-variant-numeric: tabular-nums; }
.task .n.warn { color: var(--danger); }
.task .t { font-weight: 600; }
.filters { display: flex; gap: var(--s3); flex-wrap: wrap; align-items: flex-end; margin-bottom: var(--s4); }
.filters-toggle { display: none; }
.filters .field { min-width: 150px; flex: 0 1 auto; }
.filters .field.grow { flex: 1 1 240px; }
.bulkbar { position: sticky; top: calc(var(--header-h) + 8px); z-index: 20; display: flex; gap: var(--s3); align-items: center; flex-wrap: wrap;
  padding: 10px var(--s4); border-radius: var(--r-lg); background: var(--primary-soft); border: 1px solid var(--primary-soft-2); margin-bottom: var(--s3); }
.source-chip { display: inline-flex; align-items: center; gap: 6px; padding: 2px 10px; border-radius: 999px; border: 1px solid var(--border-strong);
  font-size: var(--fs-xs); font-weight: 600; background: var(--surface-2); }
.profile-head { display: flex; gap: var(--s5); align-items: center; flex-wrap: wrap; }
.profile-head .avatar-lg { width: 56px; height: 56px; border-radius: 16px; background: var(--primary-soft); color: var(--primary); display: grid;
  place-items: center; font-size: 22px; font-weight: 750; }
.guest-banner { background: var(--warning-soft); border-bottom: 1px solid var(--warning-border); font-size: var(--fs-sm); }
.guest-banner .inner { max-width: var(--content-max); margin: 0 auto; padding: 8px var(--s6); display: flex; gap: var(--s3); align-items: center; flex-wrap: wrap; }
.score-change { display: inline-flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.score-change s { color: var(--text-3); }
.divider-or { display: flex; align-items: center; gap: 12px; color: var(--text-3); font-size: var(--fs-sm); margin: var(--s2) 0; }
.divider-or::before, .divider-or::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.topic-picks { display: flex; flex-direction: column; gap: 6px; max-height: 260px; overflow-y: auto; padding: 2px; }

@media (max-width: 1023px) {
  .admin-shell { grid-template-columns: minmax(0, 1fr); }
  .admin-side { display: none; }
  .admin-mobile-nav { display: flex; gap: 6px; overflow-x: auto; padding: 10px var(--s4); border-bottom: 1px solid var(--border);
    background: var(--surface); position: sticky; top: var(--header-h); z-index: 25; scrollbar-width: none; }
  .admin-mobile-nav a { white-space: nowrap; padding: 8px 12px; border-radius: 999px; border: 1px solid var(--border); color: var(--text-2);
    font-size: var(--fs-sm); font-weight: 600; min-height: 38px; display: inline-flex; align-items: center; }
  .admin-mobile-nav a[aria-current="page"] { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }
}
@media (max-width: 767px) {
  .table-cards { border: 0; background: transparent; overflow: visible; }
  .table-cards table, .table-cards tbody, .table-cards tr, .table-cards td { display: block; width: 100%; }
  .table-cards thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .table-cards tr { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); margin-bottom: 10px; padding: 6px 4px; }
  .table-cards td { border: 0; padding: 6px 12px; display: grid; grid-template-columns: 38% minmax(0, 1fr); gap: 8px; }
  .table-cards td::before { content: attr(data-label); color: var(--text-3); font-size: var(--fs-xs); font-weight: 600; text-transform: uppercase;
    letter-spacing: .03em; padding-top: 2px; }
  .table-cards td.actions::before, .table-cards td.pick::before { content: ""; }
  .table-cards td.actions { display: flex; justify-content: flex-end; }
  /* Thẻ rút gọn (F-11): cột phụ xếp thành dòng thông tin, nội dung giới hạn 3 dòng; bấm thẻ để mở đầy đủ. */
  .table-cards td.meta { display: inline-flex; align-items: center; gap: 4px; width: auto; padding: 2px 10px 4px; font-size: var(--fs-xs);
    color: var(--text-2); }
  .table-cards td.meta::before { content: attr(data-label) ":"; text-transform: none; letter-spacing: 0; padding-top: 0; font-weight: 500; }
  .table-cards td.main { display: block; padding-top: 8px; }
  .table-cards td.main::before { display: none; }
  .table-cards .clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
  .table-cards tr.clickable { cursor: pointer; }
  .filters .field { min-width: 0; flex: 1 1 140px; }
  /* Bộ lọc thu gọn trên điện thoại (F-11): mở bằng nút "Bộ lọc (n)" cạnh tiêu đề. */
  .filters.collapsible { display: none; }
  .filters.collapsible.open { display: flex; }
  .filters-toggle { display: inline-flex; }
  .guest-banner .inner { padding: 8px var(--s4); }
}

/* ===================================================================== 1.1 — gói học, đăng ký, xếp hạng, bảo vệ nội dung */

/* Watermark: lớp phủ mờ, không nhận chuột/bàn phím, không được trình đọc màn hình đọc (aria-hidden) */
.protected { position: relative; }
.protected > .wm { position: absolute; inset: 0; pointer-events: none; background-repeat: repeat; z-index: 2; border-radius: inherit; }
:root[data-theme="dark"] .protected > .wm { opacity: .75; filter: invert(1); }
/* Hạn chế chọn chữ (tùy chọn): chỉ phần nội dung, KHÔNG áp vào ô nhập/nút để giữ thao tác bàn phím và trợ năng */
.no-copy .q-stem, .no-copy .option .text, .no-copy .explain { -webkit-user-select: none; user-select: none; }
@media print {
  .no-copy > :not(.wm) { visibility: hidden; }
  .no-copy::after { content: "Nội dung bài làm không hỗ trợ in."; display: block; padding: 24px; }
}

/* Thẻ gói */
.plan-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--s4); }
.plan-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); padding: var(--s5);
  display: flex; flex-direction: column; gap: 10px; box-shadow: var(--shadow-1); }
.plan-card.is-off { opacity: .75; }
.plan-card h3 { font-size: var(--fs-lg); }
.plan-days { display: flex; align-items: baseline; gap: 6px; color: var(--primary); }
.plan-days b { font-size: var(--fs-3xl); line-height: 1; font-variant-numeric: tabular-nums; }
.plan-price { font-weight: 650; }
.plan-price.is-unset { color: var(--text-3); font-weight: 500; }
.plan-features { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 4px; font-size: var(--fs-sm); }
.plan-features li { display: flex; gap: 8px; align-items: center; }
.plan-features li.on { color: var(--success); }
.plan-features li.off { color: var(--text-3); }
.plan-scope { font-size: var(--fs-sm); }
.plan-current { display: flex; gap: var(--s4); align-items: flex-start; padding: var(--s4); border: 1px solid var(--success-border);
  background: var(--success-soft); border-radius: var(--r-md); }
.how-to { border-top: 1px solid var(--border); padding-top: var(--s4); display: flex; flex-direction: column; gap: 6px; }
.how-to h3 { font-size: var(--fs-md); }

/* Đăng ký */
.register-wrap { min-height: 100vh; display: flex; flex-direction: column; align-items: center; gap: var(--s6); padding: var(--s8) var(--s4); }
.register-wrap > .brand { align-self: center; }
.auth-card-wide { width: min(680px, 100%); background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-xl);
  padding: var(--s8); box-shadow: var(--shadow-2); }
.register-plans { width: min(980px, 100%); display: flex; flex-direction: column; gap: var(--s3); }

/* Ba hành động sau khi làm bài */
.next-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s3); }
.next-card { display: flex; gap: 12px; align-items: flex-start; text-align: left; padding: var(--s4); border: 1px solid var(--border);
  border-radius: var(--r-md); background: var(--surface); color: var(--text); cursor: pointer; font: inherit; min-height: var(--tap);
  transition: border-color var(--t-fast), background var(--t-fast); }
.next-card:hover:not(:disabled) { border-color: var(--primary); background: var(--primary-soft); }
.next-card:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.next-card:disabled { cursor: not-allowed; opacity: .55; }
.next-card.primary { border-color: var(--primary); }
.next-card .nc-icon { flex: none; width: 36px; height: 36px; border-radius: var(--r-full); display: grid; place-items: center;
  background: var(--primary-soft); color: var(--primary); }
.next-card .nc-text { display: flex; flex-direction: column; gap: 2px; }
.next-card .nc-text span { font-size: var(--fs-sm); color: var(--text-2); }
@media (max-width: 900px) { .next-cards { grid-template-columns: 1fr; } }

/* Bảng xếp hạng */
.lb-table tr.is-me td { background: var(--primary-soft); font-weight: 650; }
.lb-me { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: baseline; }
.lb-me b { font-size: var(--fs-2xl); color: var(--primary); }
details.card > summary { list-style: revert; }

/* Quản trị: chọn phạm vi, chọn học viên, xem trước */
.scope-picker { display: flex; flex-direction: column; gap: var(--s2); max-height: 320px; overflow: auto; padding: var(--s2) var(--s3);
  border: 1px solid var(--border); border-radius: var(--r-md); background: var(--surface-2); }
.scope-bank { border: 0; padding: 0; margin: 0; }
.scope-sets { display: flex; flex-wrap: wrap; gap: 0 var(--s4); padding-left: 28px; align-items: center; }
.pick-list { display: flex; flex-direction: column; gap: 4px; margin-top: 6px; max-height: 220px; overflow: auto; }
.pick { text-align: left; padding: 8px 10px; border: 1px solid var(--border); border-radius: var(--r-sm); background: var(--surface);
  color: var(--text); font: inherit; cursor: pointer; min-height: var(--tap); }
.pick:hover, .pick.is-on { border-color: var(--primary); background: var(--primary-soft); }
.preview-box { border: 1px solid var(--primary-soft-2); background: var(--primary-soft); border-radius: var(--r-md); padding: var(--s4);
  display: flex; flex-direction: column; gap: 8px; }
.choice.is-disabled { opacity: .6; cursor: not-allowed; }
a.kpi { color: inherit; text-decoration: none; }
a.kpi:hover { background: var(--surface-hover); }
.rank-row { padding: var(--s3) 0; border-top: 1px solid var(--border); gap: var(--s3); }
.source-chip.is-inactive { opacity: .65; text-decoration: line-through; }