:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #0f172a;
  --text-2: #334155;
  --muted: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --green: #059669;
  --amber: #b45309;
  --radius: 10px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --ring: 0 0 0 3px rgba(37, 99, 235, 0.18);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}
.wrap { max-width: 980px; margin: 0 auto; padding: 28px 16px 12px; }

/* ===== Page Header ===== */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.page-header h1 {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 4px;
  letter-spacing: -0.015em;
}
.page-header .sub { margin: 0; color: var(--muted); font-size: 14px; }
.page-header-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.role { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.role-admin { color: var(--green); font-weight: 600; }

.dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; display: inline-block; }
.dot-all { background: #94a3b8; }
.dot-nhe { background: #10b981; }
.dot-vua { background: #f59e0b; }
.dot-nang { background: #ef4444; }

/* ===== Cards ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}
.card.results {
  padding: 24px 28px;
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.07);
}
.card-title { margin: 0 0 4px; font-size: 15px; font-weight: 600; color: var(--text); }
.card-sub { margin: 0 0 18px; font-size: 13.5px; color: var(--muted); }

.section-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 10px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 40px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--text-2);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { background: #f8fafc; color: var(--text); }
.btn-danger {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--danger);
}
.btn-danger:hover { background: var(--danger-soft); border-color: #fecaca; }
.btn-sm { height: 32px; padding: 0 12px; font-size: 13px; }

/* ===== Search card ===== */
.search-row { display: flex; gap: 10px; flex-wrap: wrap; }
.search-row input[type=text] {
  flex: 1;
  min-width: 0;
  height: 48px;
  padding: 0 16px;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius);
  font-size: 16px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
}
.search-row input[type=text]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--ring);
}
.search-row button { height: 48px; padding: 0 22px; font-size: 14px; }

/* ===== Filter card ===== */
.filter-current {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
}
.filter-current .label-text { font-weight: 500; }
.filter-clear { color: var(--primary); text-decoration: none; font-weight: 600; }
.filter-clear:hover { text-decoration: underline; }

/* ===== Segmented control ===== */
.segmented {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  background: #eef0f3;
  border-radius: 10px;
  max-width: 100%;
  overflow-x: auto;
}
.segmented a,
.segmented label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0 14px;
  height: 32px;
  border-radius: 7px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-2);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
}
.segmented a:hover { color: var(--text); }
.segmented a.seg.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}
.segmented .count { color: var(--muted); font-weight: 500; }
.segmented a.seg.active .count { color: var(--text); }
.segmented input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.segmented input:checked + .seg {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}
.segmented input:checked + .seg .count { color: var(--text); }
.segmented input:focus-visible + .seg { box-shadow: var(--ring); }

/* ===== Results card ===== */
.results-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.results-title { margin: 0; font-size: 15px; font-weight: 600; }
.results-title .count { color: var(--muted); font-weight: 500; }
.results-actions { display: flex; gap: 8px; }
.results-actions .btn { height: 42px; padding: 0 18px; }
.results-title { font-size: 17px; }
.results-title .count { font-size: 14px; }

.overflow-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; background: var(--surface); }
thead th {
  text-align: left;
  padding: 12px 14px;
  background: #f8fafc;
  border-bottom: 1.5px solid var(--border);
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
tbody td {
  padding: 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  color: var(--text-2);
}
tbody td:first-child { border-left: 3px solid transparent; }
tbody tr.level-nhe td:first-child { border-left-color: #10b981; }
tbody tr.level-vua td:first-child { border-left-color: #f59e0b; }
tbody tr.level-nang td:first-child { border-left-color: #ef4444; }
tbody tr:nth-child(even) td { background: #fafbfc; }
tbody tr:hover td { background: #eef2f6; }
tbody tr:last-child td { border-bottom: none; }

.cell-name { display: block; font-weight: 600; font-size: 14.5px; color: var(--text); }
.cell-name-sub { display: block; font-size: 12px; color: var(--muted); margin-top: 2px; font-weight: 500; }
.cell-date { font-weight: 600; color: var(--text-2); font-variant-numeric: tabular-nums; }

.pill {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
}
.pill-nhe { background: #ecfdf5; color: var(--green); }
.pill-vua { background: #fffbeb; color: var(--amber); }
.pill-nang { background: #fef2f2; color: var(--danger); }

/* Responsive: bảng cho desktop, danh sách card cho mobile */
.records-table { display: block; }
.record-list { display: none; }

.empty { text-align: center; padding: 56px 16px; color: var(--muted); }
.empty-title { margin: 0 0 6px; font-size: 15px; font-weight: 600; color: var(--text); }
.empty p { margin: 0 0 4px; font-size: 14px; }
.empty .btn { margin-top: 14px; }

/* ===== Alerts ===== */
.alert {
  border: 1px solid;
  border-left-width: 3px;
  border-radius: var(--radius);
  padding: 11px 14px;
  margin-bottom: 16px;
  font-size: 14px;
}
.alert-success { background: #f0fdf4; border-color: #bbf7d0; border-left-color: var(--green); color: #065f46; }
.alert-error { background: var(--danger-soft); border-color: #fecaca; border-left-color: var(--danger); color: #991b1b; }

/* ===== Forms ===== */
.form-page { max-width: 560px; margin: 0 auto; }
.page-title { margin: 0 0 2px; font-size: 18px; font-weight: 700; }
.page-sub { margin: 0 0 20px; color: var(--muted); font-size: 13.5px; }
.back-link { display: inline-block; margin: 0 0 14px; color: var(--muted); font-size: 13.5px; text-decoration: none; }
.back-link:hover { color: var(--text); }
.field { margin-bottom: 16px; }
.field > label { display: block; margin-bottom: 6px; font-size: 13.5px; font-weight: 600; color: var(--text); }
.field label em { font-weight: 400; color: var(--muted); font-style: normal; font-size: 12.5px; }
.req { color: var(--danger); margin-left: 2px; }
.field input[type=text],
.field input[type=date],
.field input[type=password],
.field textarea {
  width: 100%;
  height: 42px;
  padding: 0 12px;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
}
.field textarea { height: auto; min-height: 84px; padding: 10px 12px; resize: vertical; }
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--ring);
}
.hint { display: block; margin-top: 5px; font-size: 12.5px; color: var(--muted); }
.form-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 20px; }

/* ===== Login ===== */
.center-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px 16px; }
.login-card { width: 100%; max-width: 380px; }

footer.note {
  text-align: center;
  padding: 16px 0 32px;
  color: var(--muted);
  font-size: 12.5px;
}

/* ===== Mobile ===== */
@media (max-width: 640px) {
  .wrap { padding: 16px 12px 8px; }
  .card { padding: 18px 16px; }
  .card.results { padding: 20px 18px; }
  .page-header { gap: 10px; }
  .page-header-right { width: 100%; }
  .search-row input[type=text] { flex-basis: 100%; }
  .search-row button { flex: 1; }
  .results-head { flex-direction: column; align-items: stretch; }
  .results-actions { width: 100%; }
  .results-actions .btn { flex: 1; }

  /* Ẩn bảng desktop, hiện danh sách card */
  .records-table { display: none; }
  .record-list { display: block; list-style: none; padding: 0; margin: 0; }

  .record-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 10px;
    overflow: hidden;
  }
  .record-card.level-nhe { border-left: 3px solid #10b981; }
  .record-card.level-vua { border-left: 3px solid #f59e0b; }
  .record-card.level-nang { border-left: 3px solid #ef4444; }

  .record-card details { margin: 0; }
  .record-card summary {
    list-style: none;
    cursor: pointer;
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    user-select: none;
  }
  .record-card summary::-webkit-details-marker { display: none; }
  .record-card summary::marker { display: none; content: ''; }
  .record-card summary:focus { outline: none; }
  .record-card summary:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: -2px;
  }

  .rc-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
  }
  .rc-date {
    font-weight: 600;
    font-size: 13px;
    color: var(--text-2);
    font-variant-numeric: tabular-nums;
  }
  .rc-chevron {
    width: 28px;
    height: 28px;
    margin-left: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    font-size: 22px;
    line-height: 1;
    transition: transform 0.2s ease;
    flex-shrink: 0;
  }
  details[open] .rc-chevron { transform: rotate(90deg); }

  .rc-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    padding-right: 32px;
  }
  .rc-class {
    font-size: 12.5px;
    color: var(--muted);
    margin-top: -2px;
  }
  .rc-violation {
    font-size: 14px;
    color: var(--text-2);
    line-height: 1.45;
    padding-right: 32px;
  }

  .rc-body {
    padding: 12px 16px 14px;
    border-top: 1px solid var(--border);
    background: #f8fafc;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .rc-row {
    display: flex;
    gap: 12px;
    font-size: 13.5px;
    align-items: baseline;
  }
  .rc-row .rc-label {
    color: var(--muted);
    font-weight: 600;
    min-width: 84px;
    flex-shrink: 0;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
  }
  .rc-row .rc-value { color: var(--text-2); flex: 1; }
  .rc-actions { margin-top: 4px; }
}