:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --text: #1c2430;
  --muted: #5b6676;
  --border: #d9dee6;
  --primary: #1f5fd6;
  --primary-strong: #174aab;
  --primary-soft: #e8f0fd;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --warning: #8a5a00;
  --warning-soft: #fff4dc;
  --success: #17703f;
  --success-soft: #e6f4ec;
  --focus: #ffb020;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141b;
    --surface: #171e27;
    --surface-2: #1d2530;
    --text: #e6ebf1;
    --muted: #9aa6b5;
    --border: #2d3846;
    --primary: #6aa1ff;
    --primary-strong: #8db7ff;
    --primary-soft: #1b2b45;
    --danger: #ff8a80;
    --danger-soft: #3a1d1d;
    --warning: #ffcc66;
    --warning-soft: #362b12;
    --success: #6fd69b;
    --success-soft: #16311f;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--font);
}

a { color: var(--primary); }
code { font-family: var(--mono); font-size: .9em; background: var(--surface-2); padding: 0 .25em; border-radius: 4px; }
h1, h2 { line-height: 1.25; margin: 0; }
h2 { font-size: 1.15rem; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

/* ---------- khung ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 12px 20px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { display: flex; flex-direction: column; }
.brand-title { font-weight: 700; font-size: 1.05rem; }
.brand-sub { color: var(--muted); font-size: .8rem; }
.topbar-user { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.topbar-user form { margin: 0; }

.layout { max-width: 1320px; margin: 0 auto; padding: 16px; display: grid; gap: 16px; }

.panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px;
  min-width: 0;
}
.panel-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 6px 16px; margin-bottom: 12px; }
.panel-head p { margin: 0; }

/* ---------- form ---------- */
.form-grid { display: grid; gap: 14px 16px; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.form-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.form-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.field-domains { grid-column: 1 / -1; }

.field { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.field label, .field .label { font-weight: 600; font-size: .9rem; }
.label-inline { margin-top: 6px; }
.req { color: var(--danger); }

input[type="text"], input[type="password"], input[type="number"], input[type="date"], input[type="search"], select, textarea {
  width: 100%; font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; min-height: 40px;
}
textarea { resize: vertical; font-family: var(--mono); font-size: .88rem; }
input[aria-invalid="true"], select[aria-invalid="true"], textarea[aria-invalid="true"] {
  border-color: var(--danger); box-shadow: 0 0 0 1px var(--danger);
}
.help { margin: 0; color: var(--muted); font-size: .8rem; }
.field-error { color: var(--danger); font-size: .85rem; font-weight: 600; }
.field-error div + div { margin-top: 2px; }

.check { display: flex; align-items: center; gap: 6px; font-weight: 400 !important; font-size: .85rem !important; }
.check input { width: 16px; height: 16px; }

.inline-range { display: flex; align-items: center; gap: 8px; }
.inline-range input { min-width: 0; }

.fieldset { border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px 14px; margin: 16px 0 0; }
.fieldset legend { font-weight: 700; padding: 0 6px; }
.fieldset > .help { margin-bottom: 10px; }

.radio-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-bottom: 8px; }
.radio-card {
  display: flex; gap: 10px; align-items: flex-start; padding: 10px 12px;
  border: 1px solid var(--border); border-radius: 8px; cursor: pointer; background: var(--surface-2);
}
.radio-card input { margin-top: 4px; }
.radio-card:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); }

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }

/* ---------- nút ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: inherit; font-weight: 600; border-radius: 8px; border: 1px solid transparent;
  padding: 9px 16px; min-height: 40px; cursor: pointer; text-decoration: none;
}
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-strong); }
.btn-secondary { background: var(--surface); color: var(--primary); border-color: var(--primary); }
.btn-danger { background: var(--surface); color: var(--danger); border-color: var(--danger); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-small { padding: 5px 10px; min-height: 32px; font-size: .85rem; }
.btn-block { width: 100%; }

/* ---------- thông báo ---------- */
.alert { border-radius: 8px; padding: 10px 14px; border: 1px solid var(--border); background: var(--surface-2); }
.alert-error { background: var(--danger-soft); border-color: var(--danger); color: var(--text); }
.alert-warning { background: var(--warning-soft); border-color: var(--warning); color: var(--text); }
.alert-success { background: var(--success-soft); border-color: var(--success); }

/* ---------- tiến độ ---------- */
.progress-text { font-weight: 600; margin: 0; }
.run-summary { border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; margin-bottom: 10px; background: var(--surface-2); }
.run-summary p { margin: 2px 0; }
.summary-status { font-weight: 700; }
.summary-status::before { margin-right: 6px; }
.summary-success { color: var(--success); }
.summary-success::before { content: "✓"; }
.summary-warning { color: var(--warning); }
.summary-warning::before { content: "⚠"; }
.summary-error { color: var(--danger); }
.summary-error::before { content: "✕"; }

.notice-list { margin: 0 0 10px; padding-left: 20px; color: var(--muted); font-size: .85rem; }
.notice-list:empty { display: none; }

.domain-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.domain-item { border: 1px solid var(--border); border-left-width: 4px; border-radius: 8px; padding: 8px 12px; background: var(--surface); }
.domain-item p { margin: 3px 0; overflow-wrap: anywhere; }
.domain-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.domain-name { overflow-wrap: anywhere; }
.status-badge {
  display: inline-flex; align-items: center; gap: 5px; font-size: .78rem; font-weight: 700;
  padding: 2px 8px; border-radius: 999px; border: 1px solid currentColor; white-space: nowrap;
}
.status-pending { border-left-color: var(--border); }
.status-pending .status-badge, .status-skipped .status-badge { color: var(--muted); }
.status-loading { border-left-color: var(--primary); }
.status-loading .status-badge { color: var(--primary); }
.status-loading .status-icon { display: inline-block; animation: spin 1.1s linear infinite; }
.status-done { border-left-color: var(--success); }
.status-done .status-badge { color: var(--success); }
.status-error { border-left-color: var(--danger); }
.status-error .status-badge { color: var(--danger); }
.status-cancelled, .status-skipped { border-left-color: var(--warning); }
.status-cancelled .status-badge { color: var(--warning); }
.domain-meta { color: var(--muted); font-size: .83rem; }
.domain-warn { color: var(--warning); font-size: .85rem; font-weight: 600; }
.domain-error { color: var(--danger); font-size: .88rem; font-weight: 600; }

@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .status-loading .status-icon { animation: none; } }

/* ---------- kết quả ---------- */
.notes { border: 1px solid var(--border); border-radius: 8px; padding: 8px 14px; margin-bottom: 12px; background: var(--surface-2); font-size: .88rem; }
.notes summary { cursor: pointer; font-weight: 700; }
.notes ul { margin: 6px 0; padding-left: 20px; }

.toolbar { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1.2fr) minmax(0, 1.2fr) minmax(0, .7fr) auto; gap: 12px; align-items: end; margin: 12px 0; }
.field-action { justify-content: flex-end; }
.result-counts { margin: 0 0 8px; font-size: .88rem; color: var(--muted); }
.empty-state { padding: 20px; text-align: center; color: var(--muted); border: 1px dashed var(--border); border-radius: 8px; margin-bottom: 10px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; }
.results-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.results-table th, .results-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.results-table thead th { position: sticky; top: 0; background: var(--surface-2); z-index: 1; white-space: nowrap; }
.results-table th button {
  font: inherit; font-weight: 700; color: var(--text); background: none; border: 0; padding: 0; cursor: pointer;
  display: inline-flex; align-items: center; gap: 4px;
}
.results-table th button::after { content: "↕"; color: var(--muted); font-size: .8em; }
.results-table th[aria-sort="ascending"] button::after { content: "▲"; color: var(--primary); }
.results-table th[aria-sort="descending"] button::after { content: "▼"; color: var(--primary); }
.results-table .num { text-align: right; white-space: nowrap; }
.results-table tbody tr:nth-child(even) { background: var(--surface-2); }
.col-keyword { font-weight: 600; min-width: 160px; overflow-wrap: anywhere; }
.col-url { max-width: 320px; overflow-wrap: anywhere; }

.badge { display: inline-block; font-size: .78rem; font-weight: 700; padding: 1px 7px; border-radius: 999px; border: 1px solid transparent; white-space: nowrap; }
.kd-easy { background: var(--success-soft); color: var(--success); border-color: var(--success); }
.kd-medium { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }
.kd-hard { background: var(--warning-soft); color: var(--warning); border-color: var(--warning); }
.kd-superhard { background: var(--danger-soft); color: var(--danger); border-color: var(--danger); }
.pos-top3, .pos-top10 { background: var(--success-soft); color: var(--success); }
.pos-top50 { background: var(--primary-soft); color: var(--primary); }
.pos-top100 { background: var(--surface-2); color: var(--muted); border-color: var(--border); }
.pos-label { display: block; font-size: .72rem; color: var(--muted); }
.cell-stack { display: inline-block; }

.pagination { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 12px; flex-wrap: wrap; }

/* ---------- đăng nhập ---------- */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 16px; }
.login-card { width: 100%; max-width: 400px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.login-card h1 { font-size: 1.3rem; }
.login-form { display: grid; gap: 14px; margin-top: 16px; }
.login-card .alert { margin-top: 12px; }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .form-grid, .form-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .form-grid-3 { grid-template-columns: minmax(0, 1fr); }
  .toolbar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .layout { padding: 10px; gap: 12px; }
  .panel { padding: 14px; }
  .form-grid, .form-grid-4, .radio-cards, .toolbar { grid-template-columns: minmax(0, 1fr); }
  .actions .btn { flex: 1 1 100%; }
  .field-action .btn { width: 100%; }

  /* Bảng dạng thẻ trên mobile */
  .table-wrap { border: 0; overflow: visible; }
  .results-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); }
  .results-table, .results-table tbody, .results-table tr, .results-table td { display: block; width: 100%; }
  .results-table tr { border: 1px solid var(--border); border-radius: 8px; margin-bottom: 10px; padding: 6px 0; background: var(--surface) !important; }
  .results-table td { border: 0; display: grid; grid-template-columns: 38% 1fr; gap: 8px; padding: 4px 12px; text-align: left !important; white-space: normal; }
  .results-table td::before { content: attr(data-label); font-weight: 600; color: var(--muted); }
  .col-url { max-width: none; }
  .results-table td > .badge, .results-table td > .cell-stack { justify-self: start; }
  .pos-label { display: inline; margin-left: 6px; }
}