:root {
  color-scheme: light;
  --green-950: #06281f;
  --green-900: #0b3d30;
  --green-800: #105240;
  --green-700: #166b53;
  --green-600: #1f8a68;
  --green-100: #dff5eb;
  --mint-50: #f4fbf7;
  --surface: #ffffff;
  --text: #18332b;
  --muted: #6a7b75;
  --border: #dbe8e2;
  --danger: #b42318;
  --shadow: 0 22px 70px rgba(6, 40, 31, 0.16);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(31, 138, 104, 0.18), transparent 32rem),
    linear-gradient(135deg, #f7fcf9 0%, #edf8f1 44%, #ffffff 100%);
}

button,
input,
select {
  font: inherit;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.login-card {
  width: min(460px, 100%);
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.login-card h1,
.hero-card h2 {
  margin: 1rem 0 0.5rem;
  color: var(--green-950);
}

.login-card p,
.hero-card p,
.feature-card p {
  color: var(--muted);
  line-height: 1.6;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand.compact {
  margin-bottom: 1.5rem;
}

.brand-mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  color: white;
  font-weight: 800;
  background: linear-gradient(135deg, var(--green-700), var(--green-600));
  box-shadow: 0 12px 30px rgba(22, 107, 83, 0.28);
}

.brand-title {
  font-weight: 800;
  color: var(--green-950);
}

.brand-subtitle,
.eyebrow {
  color: var(--muted);
  font-size: 0.85rem;
}

.scope-text {
  margin-top: 0.25rem;
  color: var(--green-700);
  font-size: 0.86rem;
  font-weight: 700;
}

.login-form {
  display: grid;
  gap: 1rem;
  margin-top: 1.4rem;
}

label {
  display: grid;
  gap: 0.45rem;
  font-weight: 700;
}

input,
select {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text);
  background: #fbfffd;
}

/* Native dropdown panels use a white system surface on Windows. Keep their
   labels gray so both the selected value and every option remain readable. */
select,
select option,
[role="combobox"] {
  color: #5f6b66;
  background-color: #ffffff;
}

select:disabled,
select option:disabled,
[role="combobox"][aria-disabled="true"] {
  color: #8a9490;
}

input:focus,
select:focus {
  outline: 3px solid rgba(31, 138, 104, 0.18);
  border-color: var(--green-600);
}

.primary-button,
.ghost-button,
.nav-item {
  border: 0;
  cursor: pointer;
}

.primary-button {
  padding: 0.9rem 1.2rem;
  border-radius: 14px;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--green-700), var(--green-600));
}

.primary-button.small {
  padding: 0.65rem 0.9rem;
}

.primary-button:disabled {
  cursor: wait;
  opacity: 0.72;
}

.ghost-button {
  padding: 0.65rem 0.9rem;
  border-radius: 14px;
  color: var(--green-900);
  background: var(--green-100);
}

.ghost-button.small {
  padding: 0.55rem 0.7rem;
  font-size: 0.88rem;
}

.form-error {
  min-height: 1.25rem;
  color: var(--danger);
  font-weight: 700;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 292px 1fr;
}

.sidebar {
  padding: 1.35rem;
  color: #eaf8f1;
  background: linear-gradient(180deg, var(--green-900), var(--green-800));
}

.sidebar .brand-title {
  color: white;
}

.sidebar .brand-subtitle {
  color: #bde7d2;
}

.nav {
  display: grid;
  gap: 1.2rem;
  margin-top: 2rem;
}

.nav-section-title {
  margin: 0.4rem 0 0.5rem;
  color: #a8dec8;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-item {
  width: 100%;
  display: block;
  margin: 0.2rem 0;
  padding: 0.72rem 0.85rem;
  border-radius: 14px;
  color: #f5fffa;
  text-align: left;
  background: transparent;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.11);
}

.main {
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.2rem 1.6rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px);
}

.topbar h1 {
  margin: 0.2rem 0 0;
  color: var(--green-950);
  font-size: 1.25rem;
}

.topbar-actions {
  display: flex;
  gap: 0.7rem;
}

.content {
  padding: 1.6rem;
}

.page-grid {
  display: grid;
  gap: 1.2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1rem;
}

.hero-card,
.feature-card,
.detail-card {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 16px 45px rgba(6, 40, 31, 0.08);
}

.hero-card {
  padding: 1.5rem;
}

.badge {
  display: inline-flex;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  color: var(--green-900);
  font-size: 0.78rem;
  font-weight: 800;
  background: var(--green-100);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.metric-card {
  display: grid;
  gap: 0.45rem;
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(244,251,247,0.96));
  box-shadow: 0 16px 45px rgba(6, 40, 31, 0.08);
}

.metric-card span,
.metric-card small {
  color: var(--muted);
  font-weight: 700;
}

.metric-card strong {
  color: var(--green-900);
  font-size: clamp(1.8rem, 4vw, 2.7rem);
}

.feature-card,
.detail-card {
  padding: 1.2rem;
}

.feature-card h3 {
  margin: 0 0 0.45rem;
  color: var(--green-950);
}

.feature-card span {
  color: var(--green-700);
  font-weight: 800;
}

.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 0.85fr);
  gap: 1rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.form-grid h3 {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--green-950);
}

.role-checkbox-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .65rem 1rem; }
.role-checkbox-grid legend { margin-bottom: .65rem; font-weight: 800; }
.role-checkbox-grid .checkbox-row { display: flex; align-items: center; gap: .55rem; min-height: 34px; margin: 0; }
.role-checkbox-grid .checkbox-row input { flex: 0 0 auto; width: 18px; height: 18px; margin: 0; }
.role-checkbox-grid .checkbox-row span { line-height: 1.25; }

.span-2 {
  grid-column: 1 / -1;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 0.5rem;
}

.school-selector {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) auto;
  gap: 0.75rem;
  align-items: end;
  margin-top: 1rem;
}

.form-actions,
.section-header,
.table-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.form-actions {
  justify-content: flex-end;
}

.section-header {
  justify-content: space-between;
  margin-bottom: 1rem;
}

.section-header h3,
.section-header p,
.checklist-card h3 {
  margin: 0;
}

.section-header p {
  margin-top: 0.35rem;
  color: var(--muted);
}

.checklist-card ol {
  padding-left: 1.25rem;
  color: var(--muted);
  line-height: 1.75;
}

.table-wrap {
  overflow-x: auto;
}

.table-wrap.scroll-20 {
  max-height: min(65vh, 640px);
  overflow: auto;
}

.table-wrap.scroll-20 thead th {
  position: sticky;
  top: 0;
  z-index: 1;
}

.table-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.pagination-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pagination-current {
  color: var(--green-900);
  font-weight: 800;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.tab-button {
  padding: 0.68rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--green-900);
  cursor: pointer;
  background: #fff;
}

.tab-button.active {
  color: #fff;
  border-color: var(--green-700);
  background: var(--green-700);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 920px;
}

th,
td {
  padding: 0.8rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--green-950);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--mint-50);
}

/* Dòng master được chọn trong các bảng master–detail, hỗ trợ cả chuột và bàn phím. */
tr[data-so-code] { cursor: pointer; }
tr[data-so-code]:hover,
tr[data-so-code]:focus { background: var(--mint-50); outline: none; }
tr[data-so-code].selected-row { background: var(--green-100); box-shadow: inset 4px 0 0 var(--green-700); }

.table-badge {
  display: inline-flex;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  color: var(--green-900);
  font-weight: 800;
  background: var(--green-100);
}

.empty-cell {
  padding: 1.2rem;
  color: var(--muted);
  text-align: center;
}

.detail-drawer {
  margin-top: 1rem;
}

.detail-drawer h4 {
  margin: 0 0 0.7rem;
  color: var(--green-950);
}

code {
  color: var(--green-900);
  font-weight: 800;
}

pre {
  max-height: 360px;
  overflow: auto;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  color: #d8f8e9;
  background: var(--green-950);
}

.error-text {
  color: var(--danger);
}

.toast-root {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 30;
  display: grid;
  gap: 0.75rem;
}

.toast {
  max-width: 420px;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  color: var(--green-950);
  background: white;
  box-shadow: var(--shadow);
}

.toast.success {
  border-color: #a6dec5;
}

.toast.error {
  color: var(--danger);
  border-color: #f2b8b5;
}

.error-modal-backdrop { position: fixed; inset: 0; z-index: 1000; display: grid; place-items: center; padding: 20px; background: rgba(5, 28, 20, .68); }
.error-modal-backdrop[hidden] { display: none; }
.error-modal { width: min(520px, 100%); padding: 24px; border: 1px solid #f2b8b5; border-radius: 20px; background: #fff; box-shadow: 0 28px 80px rgba(0,0,0,.3); color: var(--green-950); }
.error-modal h2 { margin: 0 0 10px; color: var(--danger); }
.error-modal p { margin: 0; white-space: pre-wrap; line-height: 1.55; }
.error-modal-icon { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 12px; border-radius: 50%; color: #fff; background: var(--danger); font-size: 24px; font-weight: 900; }
.error-modal-actions { display: flex; justify-content: flex-end; margin-top: 22px; }

dl {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0.8rem 1rem;
  margin: 0;
}

dt {
  color: var(--muted);
  font-weight: 700;
}

dd {
  margin: 0;
  font-weight: 800;
}

.candidate-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: .8rem; margin-bottom: 1rem; }
.candidate-card { display: grid; gap: .35rem; padding: 1rem; border: 1px solid var(--border); border-radius: 14px; background: white; cursor: pointer; }
.candidate-card.selected { border-color: var(--green-600); box-shadow: 0 0 0 2px rgba(29, 122, 82, .12); }
.candidate-card > strong { color: var(--green-800); font-size: 1.5rem; }
.segmented { display: flex; gap: .35rem; flex-wrap: wrap; }
.segmented .active { color: white; background: var(--green-700); }
.solver-progress { margin-top: 1rem; padding: 1rem; border-radius: 14px; background: var(--green-50); }
.solver-progress progress { width: 100%; height: 12px; accent-color: var(--green-700); }
.preflight-summary { margin-top: 1rem; padding: .8rem 1rem; border-radius: 12px; }
.preflight-summary.success { color: var(--green-900); background: #dcf7e9; }
.preflight-summary.error, .conflict-panel { color: var(--danger); background: #fff1f0; }
.conflict-panel { margin: .8rem 0; padding: 1rem; border: 1px solid #f2b8b5; border-radius: 12px; }
.inline-editor { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .8rem; margin-top: 1rem; padding: 1rem; border: 1px solid var(--border); border-radius: 14px; }
.inline-editor h4, .inline-editor .form-actions { grid-column: 1 / -1; }
.timetable-grid { display: grid; grid-template-columns: 70px repeat(var(--days), minmax(150px, 1fr)); overflow: auto; border: 1px solid var(--border); border-radius: 12px; }
.timetable-grid > * { min-height: 52px; padding: .6rem; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.timetable-grid > strong, .grid-corner, .grid-period { background: var(--green-50); }
.grid-cell span { display: grid; margin-bottom: .25rem; padding: .35rem; border-radius: 8px; background: #edf8f2; }
.grid-cell small { color: var(--muted); }
.notice { margin-bottom: 1rem; padding: .8rem 1rem; border-left: 4px solid #d89b1d; background: #fff8e6; }
.repair-panel { margin-top: 1rem; padding: 1rem; border: 1px solid var(--border); border-radius: 16px; background: #f9fcfa; }
.diagnostic-panel { margin-top: 1rem; padding: 1rem; border-radius: 14px; border-left: 5px solid var(--danger); background: #fff1f0; }
.diagnostic-panel.unknown { color: #684d05; border-left-color: #d89b1d; background: #fff8e6; }

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split-grid,
  .form-grid,
  .school-selector,
  .inline-editor {
    grid-template-columns: 1fr;
  }

  .span-2 {
    grid-column: auto;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .metric-grid {
    grid-template-columns: 1fr;
  }
}