:root {
  --primary: #0b6e4f;
  --primary-dark: #074f38;
  --primary-light: #e6f4ef;
  --accent: #0b57d0;
  --warning: #d97706;
  --warning-bg: #fef3c7;
  --danger: #d93025;
  --danger-bg: #fce8e6;
  --success: #15803d;
  --success-bg: #dcfce7;
  --bg: #f4f7f6;
  --surface: #ffffff;
  --text: #0f172a;
  --text-muted: #475569;
  --border: #cbd5e1;
  --radius: 12px;
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.06);
  --font-lao: "Noto Sans Lao", "Phetsarath OT", "Saysettha OT", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

html {
  font-size: 16px;
  font-family: var(--font-lao);
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.6;
}

body {
  margin: 0;
  padding: 0;
  min-block-size: 100vh;
}

/* Focus accessibility */
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
button:focus-visible,
.table-wrapper:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* Visually hidden helper */
.visually-hidden {
  position: absolute;
  clip-path: inset(50%);
  overflow: hidden;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  white-space: nowrap;
}

/* Header & Top Bar */
.app-header {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #ffffff;
  padding-block: 1rem;
  padding-inline: 1.5rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
  position: sticky;
  inset-block-start: 0;
  z-index: 20;
}

.header-inner {
  max-inline-size: 1360px;
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-emblem {
  inline-size: 46px;
  block-size: 46px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.brand-text h1 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
}

.brand-text p {
  margin: 0;
  font-size: 0.875rem;
  opacity: 0.9;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

/* Status Pill */
.rt-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.rt-dot {
  inline-size: 10px;
  block-size: 10px;
  border-radius: 50%;
  background-color: #4ade80;
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.3);
  animation: pulse 2s infinite;
}

.rt-status-pill.offline .rt-dot {
  background-color: #fbbf24;
  box-shadow: 0 0 0 3px rgba(251, 191, 36, 0.3);
  animation: none;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.18); opacity: 0.75; }
}

/* Main Navigation Tabs */
.nav-bar {
  background: var(--surface);
  border-block-end: 1px solid var(--border);
  position: sticky;
  inset-block-start: 78px;
  z-index: 15;
}

.nav-inner {
  max-inline-size: 1360px;
  margin-inline: auto;
  padding-inline: 1.5rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
}

.tab-btn {
  appearance: none;
  background: transparent;
  border: none;
  border-block-end: 3px solid transparent;
  padding: 0.85rem 1.25rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  min-block-size: 48px;
  transition: color 0.15s, border-color 0.15s, background-color 0.15s;
}

.tab-btn:hover {
  color: var(--primary);
  background-color: var(--primary-light);
}

.tab-btn[aria-selected="true"] {
  color: var(--primary);
  border-block-end-color: var(--primary);
  background-color: rgba(11, 110, 79, 0.05);
}

.badge-count {
  background: var(--primary);
  color: #fff;
  font-size: 0.78rem;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
}

/* Main Content Container */
.main-container {
  max-inline-size: 1360px;
  margin-inline: auto;
  padding: 1.5rem;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Cards & Grid */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-block-end: 1.5rem;
}

.card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-block-end: 1.25rem;
  padding-block-end: 0.75rem;
  border-block-end: 1px solid #e2e8f0;
}

.card-header h2,
.card-header h3 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--primary-dark);
}

/* KPI Grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-block-end: 1.5rem;
}

.kpi-card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow);
  border-inline-start: 5px solid var(--primary);
}

.kpi-card.warning {
  border-inline-start-color: var(--warning);
}

.kpi-card.danger {
  border-inline-start-color: var(--danger);
}

.kpi-card.accent {
  border-inline-start-color: var(--accent);
}

.kpi-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
}

.kpi-value {
  font-size: 1.85rem;
  font-weight: 800;
  margin-block: 0.25rem;
  color: var(--text);
}

.kpi-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Dashboard 2-Column Layout */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 1.5rem;
  margin-block-end: 1.5rem;
}

/* Bar Charts */
.bar-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.bar-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.bar-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 600;
}

.bar-track {
  inline-size: 100%;
  block-size: 12px;
  background: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
}

.bar-fill {
  block-size: 100%;
  background: var(--primary);
  border-radius: 999px;
  transition: inline-size 0.35s ease;
}

.bar-fill.warning { background: var(--warning); }
.bar-fill.danger { background: var(--danger); }
.bar-fill.accent { background: var(--accent); }

/* Material Summary Pills */
.material-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0.85rem;
}

.mat-box {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  text-align: center;
}

.mat-box .mat-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

.mat-box .mat-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin-block: 0.2rem;
}

.mat-box .mat-unit {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Forms & Validation (Modern Web Guidance compliant) */
.survey-step-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-block-end: 1.5rem;
  background: var(--surface);
  padding: 0.85rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.step-pill {
  flex: 1 1 150px;
  min-block-size: 48px;
  padding: 0.55rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #f8fafc;
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  text-align: start;
  transition: all 0.15s;
}

.step-pill.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

fieldset.survey-section {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1.5rem;
  margin: 0 0 1.5rem 0;
  box-shadow: var(--shadow);
}

fieldset.survey-section > legend {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  background: var(--primary);
  padding: 0.45rem 1.1rem;
  border-radius: 8px;
}

.sub-heading {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-block: 1.25rem 0.75rem;
  padding-block-end: 0.35rem;
  border-block-end: 2px solid var(--primary-light);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.15rem;
  margin-block-end: 1.25rem;
}

.form-group {
  margin-block-end: 1.25rem;
  display: flex;
  flex-direction: column;
}

/* Gestalt Proximity Rule: vertical margin between label and input is less than margin between form groups */
label.field-label {
  display: inline-block;
  font-weight: 600;
  font-size: 0.95rem;
  margin-block-end: 0.35rem;
  color: var(--text);
}

.req-star {
  color: var(--danger);
  font-weight: 700;
}

.field-hint {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-block-end: 0.4rem;
}

input[type="text"],
input[type="tel"],
input[type="date"],
input[type="month"],
input[type="number"],
select,
textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.7rem 0.9rem;
  min-block-size: 48px;
  border: 1.5px solid #94a3b8;
  border-radius: 8px;
  background-color: #ffffff;
  color: var(--text);
  width: 100%;
}

textarea {
  min-block-size: 96px;
  resize: vertical;
}

/* Required Field Feedback (:user-invalid + fallback) */
input:user-invalid,
select:user-invalid,
textarea:user-invalid,
input.user-invalid-fallback,
select.user-invalid-fallback,
textarea.user-invalid-fallback {
  border-color: var(--danger);
  background-color: var(--danger-bg);
}

.error-msg {
  display: none;
  color: var(--danger);
  font-size: 0.85rem;
  font-weight: 600;
  margin-block-start: 0.35rem;
}

input:user-invalid + .error-msg,
select:user-invalid + .error-msg,
textarea:user-invalid + .error-msg,
input.user-invalid-fallback + .error-msg,
select.user-invalid-fallback + .error-msg,
textarea.user-invalid-fallback + .error-msg {
  display: block;
}

/* Touch-friendly Radio & Checkbox Cards */
.choice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.65rem;
}

.choice-stack {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

label.choice-item {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.7rem 0.95rem;
  min-block-size: 48px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: #f8fafc;
  cursor: pointer;
  font-size: 0.96rem;
  transition: background-color 0.15s, border-color 0.15s;
}

label.choice-item:hover {
  background: var(--primary-light);
  border-color: var(--primary);
}

label.choice-item:has(input:checked) {
  background: var(--primary-light);
  border-color: var(--primary);
  font-weight: 600;
}

input[type="radio"],
input[type="checkbox"] {
  accent-color: var(--primary);
  inline-size: 1.25rem;
  block-size: 1.25rem;
  margin-block-start: 0.2rem;
  flex-shrink: 0;
}

@media (pointer: coarse) {
  input[type="text"],
  input[type="tel"],
  input[type="date"],
  input[type="month"],
  input[type="number"],
  select,
  button,
  label.choice-item {
    min-block-size: 52px;
  }
}

/* Step Evaluation Boxes in Section III */
.step-eval-box {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.15rem;
  margin-block-end: 1rem;
  background: #fcfdfd;
}

.step-eval-box h4 {
  margin: 0 0 0.75rem 0;
  color: var(--primary-dark);
  font-size: 1rem;
}

/* Smart Alert Banner */
.smart-banner {
  background: var(--warning-bg);
  border: 1px solid #f59e0b;
  border-inline-start: 5px solid var(--warning);
  padding: 0.9rem 1.1rem;
  border-radius: 8px;
  margin-block-end: 1.15rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

/* Signature Pads */
.sig-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.sig-box {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  background: #f8fafc;
}

.sig-canvas {
  inline-size: 100%;
  block-size: 150px;
  background: #ffffff;
  border: 1.5px dashed #64748b;
  border-radius: 8px;
  touch-action: none;
  cursor: crosshair;
  display: block;
  margin-block: 0.5rem;
}

/* Buttons */
.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.65rem 1.2rem;
  min-block-size: 48px;
  font-family: inherit;
  font-size: 0.96rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: #f1f5f9;
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: #f87171;
}

.btn-sm {
  min-block-size: 38px;
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
}

/* Responsive Data Table (Modern Web Guidance `responsive-table` compliant) */
.table-wrapper {
  overflow: auto;
  max-inline-size: 100%;
  max-block-size: min(560px, 80vh);
  container-type: inline-size;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}

table.data-table {
  inline-size: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.92rem;
}

table.data-table caption {
  padding: 0.75rem 1rem;
  font-weight: 700;
  text-align: start;
  background: #f8fafc;
  border-block-end: 1px solid var(--border);
}

table.data-table th,
table.data-table td {
  padding: 0.75rem 1rem;
  border-block-end: 1px solid #e2e8f0;
  text-align: start;
  vertical-align: middle;
}

/* Sticky column headers (desktop) */
table.data-table thead {
  position: sticky;
  inset-block-start: 0;
  z-index: 2;
  background: #f1f5f9;
}

table.data-table thead th {
  background: #f1f5f9;
  font-weight: 700;
  color: var(--text);
  border-block-end: 2px solid var(--border);
}

/* Sticky row headers (desktop) */
table.data-table tbody th {
  position: sticky;
  inset-inline-start: 0;
  background: #ffffff;
  z-index: 1;
  font-weight: 600;
  border-inline-end: 1px solid #e2e8f0;
}

table.data-table tbody tr:hover td,
table.data-table tbody tr:hover th {
  background-color: #f8fafc;
}

/* Container Query for Stacked Mobile Table */
@container (width < 600px) {
  table.data-table,
  table.data-table thead,
  table.data-table tbody,
  table.data-table tr,
  table.data-table th,
  table.data-table td {
    display: block;
  }

  table.data-table thead {
    display: none;
  }

  table.data-table tr {
    margin-block-end: 1.25rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
  }

  table.data-table tbody th {
    position: sticky;
    inset-block-start: 0;
    z-index: 2;
    background: var(--primary-light);
    color: var(--primary-dark);
  }

  table.data-table td:nth-child(2)::before {
    content: var(--label-2) ": ";
    font-weight: 700;
  }
  table.data-table td:nth-child(3)::before {
    content: var(--label-3) ": ";
    font-weight: 700;
  }
  table.data-table td:nth-child(4)::before {
    content: var(--label-4) ": ";
    font-weight: 700;
  }
  table.data-table td:nth-child(5)::before {
    content: var(--label-5) ": ";
    font-weight: 700;
  }
  table.data-table td:nth-child(6)::before {
    content: var(--label-6) ": ";
    font-weight: 700;
  }
  table.data-table td:nth-child(7)::before {
    content: var(--label-7) ": ";
    font-weight: 700;
  }
}

/* Status Badges */
.status-badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}
.status-badge.zero { background: var(--danger-bg); color: var(--danger); }
.status-badge.inprog { background: var(--warning-bg); color: #b45309; }
.status-badge.done { background: var(--success-bg); color: var(--success); }

/* Dialogs (`light-dismiss-a-dialog` compliant) */
dialog {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0;
  max-inline-size: min(920px, 94vw);
  inline-size: 100%;
  max-block-size: 90vh;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  color: var(--text);
}

dialog::backdrop {
  background-color: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(3px);
}

.dialog-inner {
  padding: 1.5rem;
  overflow-y: auto;
  max-block-size: 88vh;
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-block-end: 1px solid var(--border);
  padding-block-end: 0.85rem;
  margin-block-end: 1.25rem;
}

/* Official Printable Document View */
.official-doc {
  font-family: "Phetsarath OT", "Noto Sans Lao", serif;
  line-height: 1.65;
  color: #000000;
  padding: 1.25rem;
  background: #ffffff;
}

.official-doc .doc-center {
  text-align: center;
}

.official-doc .doc-header-split {
  display: flex;
  justify-content: space-between;
  margin-block: 0.75rem;
}

.official-doc .doc-section-title {
  font-weight: 700;
  margin-block: 1rem 0.4rem;
  border-block-end: 1px solid #000;
  padding-block-end: 0.2rem;
}

.official-doc .sig-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  text-align: center;
  margin-block-start: 1.5rem;
}

/* Toast Notification */
.toast-container {
  position: fixed;
  inset-block-end: 1.5rem;
  inset-inline-end: 1.5rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: #0f172a;
  color: #ffffff;
  padding: 0.85rem 1.25rem;
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  font-weight: 600;
  font-size: 0.92rem;
  border-inline-start: 4px solid #4ade80;
}

@media print {
  .app-header,
  .nav-bar,
  .no-print {
    display: none !important;
  }
  body {
    background: #ffffff;
  }
  dialog {
    position: static;
    border: none;
    box-shadow: none;
    max-inline-size: 100%;
    max-block-size: none;
  }
  .dialog-inner {
    max-block-size: none;
    overflow: visible;
    padding: 0;
  }
}