/* ============================================================
   LabourLanka design tokens — from the product requirements
   ("UX principles and mobile design system"). Mobile-first:
   designed for a 360–400px phone; desktop is the same layout
   centred at max 720px. Every colour goes through a token so
   dark mode is a token swap, not per-component overrides.
   ============================================================ */
:root {
  --ll-primary: #1F3A5F;        /* deep blueprint blue — header, primary buttons, links */
  --ll-primary-hover: #172D4A;
  --ll-accent: #F2A900;         /* safety amber — result numbers, highlights, active tab */
  --ll-surface: #F5F4F0;        /* concrete — page background */
  --ll-card: #FFFFFF;
  --ll-text: #1C1C1C;
  --ll-text-secondary: #5B6470;
  --ll-border: #E2E0DA;
  --ll-success: #2E7D32;
  --ll-warning: #B26A00;
  --ll-error: #C62828;
  --ll-on-primary: #FFFFFF;

  --ll-font-heading: 'Archivo', system-ui, sans-serif;
  --ll-font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --ll-font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --ll-radius-card: 12px;
  --ll-radius-input: 10px;
  --ll-touch: 48px;
  --ll-gutter: 16px;
  --ll-max-width: 720px;
  --ll-bottom-nav-height: 64px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ll-primary: #8FB3E0;
    --ll-primary-hover: #A9C6EA;
    --ll-accent: #F2B632;
    --ll-surface: #121417;
    --ll-card: #1C1F24;
    --ll-text: #ECEDEE;
    --ll-text-secondary: #A3AAB3;
    --ll-border: #2C3138;
    --ll-on-primary: #0E1A2B;
  }
}

:root[data-theme="dark"] {
  --ll-primary: #8FB3E0;
  --ll-primary-hover: #A9C6EA;
  --ll-accent: #F2B632;
  --ll-surface: #121417;
  --ll-card: #1C1F24;
  --ll-text: #ECEDEE;
  --ll-text-secondary: #A3AAB3;
  --ll-border: #2C3138;
  --ll-on-primary: #0E1A2B;
}

/* ============================================================
   Base
   ============================================================ */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--ll-surface);
  color: var(--ll-text);
  font-family: var(--ll-font-body);
  line-height: 1.5;
  /* Room for the fixed bottom nav (+ iOS home indicator). */
  padding-bottom: calc(var(--ll-bottom-nav-height) + env(safe-area-inset-bottom));
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--ll-font-heading);
  color: var(--ll-text);
}

a {
  color: var(--ll-primary);
}

a:hover {
  color: var(--ll-primary-hover);
}

.ll-container {
  max-width: var(--ll-max-width);
  padding-left: var(--ll-gutter);
  padding-right: var(--ll-gutter);
}

.ll-main {
  padding-top: 16px;
  padding-bottom: 24px;
}

.ll-text-secondary {
  color: var(--ll-text-secondary);
}

.ll-number {
  font-family: var(--ll-font-mono);
  font-variant-numeric: tabular-nums;
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem var(--ll-card), 0 0 0 0.25rem var(--ll-accent);
}

/* ============================================================
   Header
   ============================================================ */
.ll-navbar {
  background: var(--ll-primary);
  padding: 8px 0;
}

.ll-navbar .ll-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.ll-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-right: auto;
  color: var(--ll-on-primary);
  font-family: var(--ll-font-heading);
  font-weight: 800;
  font-size: 20px;
}

.ll-brand:hover, .ll-brand:focus {
  color: var(--ll-on-primary);
}

.ll-country-chip {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .35);
  color: var(--ll-on-primary);
  font-size: 14px;
  font-weight: 600;
}

.ll-menu-toggle {
  min-width: var(--ll-touch);
  min-height: var(--ll-touch);
  border: 0;
  color: var(--ll-on-primary);
  font-size: 28px;
  padding: 0;
}

.ll-navbar .navbar-collapse {
  flex-basis: 100%;
}

.ll-navbar .nav-link {
  color: var(--ll-on-primary);
  min-height: var(--ll-touch);
  display: flex;
  align-items: center;
}

.ll-navbar .nav-link.active,
.ll-navbar .nav-link:hover {
  color: var(--ll-accent);
}

/* ============================================================
   Page building blocks
   ============================================================ */
.ll-hero {
  padding: 8px 0 16px;
}

.ll-hero-title {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
}

.ll-hero-subtitle {
  color: var(--ll-text-secondary);
  margin-bottom: 0;
}

.ll-page-header {
  margin-bottom: 16px;
}

.ll-eyebrow {
  margin-bottom: 4px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ll-text-secondary);
}

.ll-page-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 4px;
}

.ll-page-subtitle {
  color: var(--ll-text-secondary);
  margin-bottom: 0;
}

.ll-card {
  background: var(--ll-card);
  border: 1px solid var(--ll-border);
  border-radius: var(--ll-radius-card);
  padding: 16px;
  margin-bottom: 16px;
}

.ll-card-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.ll-error-icon {
  display: block;
  font-size: 40px;
  color: var(--ll-warning);
  margin-bottom: 8px;
}

.btn-ll-primary {
  min-height: var(--ll-touch);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: var(--ll-radius-input);
  background: var(--ll-primary);
  border: 1px solid var(--ll-primary);
  color: var(--ll-on-primary);
  font-weight: 600;
}

.btn-ll-primary:hover, .btn-ll-primary:focus {
  background: var(--ll-primary-hover);
  border-color: var(--ll-primary-hover);
  color: var(--ll-on-primary);
}

.form-control, .form-select {
  min-height: var(--ll-touch);
  border-radius: var(--ll-radius-input);
}

/* ============================================================
   Footer + bottom navigation
   ============================================================ */
.ll-footer {
  padding: 16px 0;
  font-size: 14px;
  color: var(--ll-text-secondary);
}

.ll-bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1030;
  display: flex;
  justify-content: center;
  height: calc(var(--ll-bottom-nav-height) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--ll-card);
  border-top: 1px solid var(--ll-border);
}

.ll-bottom-nav-item {
  flex: 1 1 0;
  max-width: calc(var(--ll-max-width) / 5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: var(--ll-touch);
  font-size: 12px;
  font-weight: 500;
  color: var(--ll-text-secondary);
  text-decoration: none;
}

.ll-bottom-nav-item i {
  font-size: 22px;
  line-height: 1;
}

.ll-bottom-nav-item.active {
  color: var(--ll-primary);
  box-shadow: inset 0 3px 0 var(--ll-accent);
}

.ll-bottom-nav-item[aria-disabled="true"] {
  opacity: .45;
}

/* ============================================================
   Loading feedback (see wwwroot/js/site.js)
   ============================================================ */
#ll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--ll-accent);
  z-index: 2000;
  opacity: 0;
  transition: width 4s cubic-bezier(.1, .7, 1, .1), opacity .3s ease;
  pointer-events: none;
}

#ll-progress-bar.ll-progress-bar-active {
  width: 90%;
  opacity: 1;
}

.ll-btn-loading {
  opacity: .85;
  cursor: wait !important;
}

.ll-btn-loading .spinner-border {
  border-width: .16em;
}

/* ============================================================
   Shared small pieces
   ============================================================ */
.ll-btn-secondary {
  min-height: var(--ll-touch);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 16px;
  border-radius: var(--ll-radius-input);
  background: var(--ll-card);
  border: 1px solid var(--ll-border);
  color: var(--ll-primary);
  font-weight: 600;
}

.ll-btn-secondary:hover, .ll-btn-secondary:focus {
  border-color: var(--ll-primary);
  color: var(--ll-primary);
  background: var(--ll-card);
}

.ll-icon-btn {
  min-width: var(--ll-touch);
  min-height: var(--ll-touch);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: var(--ll-radius-input);
  background: transparent;
  color: var(--ll-text-secondary);
}

.ll-icon-btn:hover {
  color: var(--ll-error);
}

.ll-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--ll-text-secondary);
}

.ll-alert {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin: 12px 0 0;
  padding: 12px;
  border-radius: var(--ll-radius-input);
  border: 1px solid currentColor;
  font-size: 14px;
}

.ll-alert-error {
  color: var(--ll-error);
}

.ll-alert-warning {
  color: var(--ll-warning);
}

.ll-toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--ll-bottom-nav-height) + 72px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 1040;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--ll-text);
  color: var(--ll-surface);
  font-size: 14px;
}

/* ============================================================
   Calculator form (PRD S3/S5): fields, unit toggle, chips,
   "Adjust assumptions", openings
   ============================================================ */
.ll-calc-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ll-field {
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

.ll-field-label {
  display: block;
  margin-bottom: 6px;
  padding: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--ll-text);
}

.ll-field-help {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--ll-text-secondary);
}

.ll-field-error {
  margin: 6px 0 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--ll-error);
}

.ll-input-group {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.ll-input {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 16px; /* 16px stops iOS zooming into the field */
  background: var(--ll-card);
  color: var(--ll-text);
  border-color: var(--ll-border);
}

.ll-field-invalid .ll-input {
  border-color: var(--ll-error);
}

.ll-unit-select {
  flex: 0 0 auto;
  width: auto;
  min-width: 76px;
  min-height: var(--ll-touch);
  border-radius: var(--ll-radius-input);
  background-color: var(--ll-surface);
  color: var(--ll-text);
  border-color: var(--ll-border);
  font-weight: 600;
}

.ll-select {
  background-color: var(--ll-card);
  color: var(--ll-text);
  border-color: var(--ll-border);
}

.ll-input-unit {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: var(--ll-radius-input);
  background: var(--ll-surface);
  color: var(--ll-text-secondary);
  font-size: 14px;
  font-weight: 600;
}

.ll-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ll-chip-input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.ll-chip {
  min-height: var(--ll-touch);
  display: inline-flex;
  align-items: center;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--ll-border);
  background: var(--ll-card);
  color: var(--ll-text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
}

.ll-chip-input:checked + .ll-chip,
.ll-filter-chip[aria-pressed="true"] {
  background: var(--ll-primary);
  border-color: var(--ll-primary);
  color: var(--ll-on-primary);
}

.ll-chip-input:focus-visible + .ll-chip {
  box-shadow: 0 0 0 0.1rem var(--ll-card), 0 0 0 0.25rem var(--ll-accent);
}

.ll-assumptions {
  border-top: 1px solid var(--ll-border);
  padding-top: 12px;
}

.ll-assumptions > summary,
.ll-working > summary {
  min-height: var(--ll-touch);
  display: flex;
  align-items: center;
  font-weight: 600;
  color: var(--ll-primary);
  cursor: pointer;
}

.ll-assumptions-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-top: 8px;
}

.ll-openings-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.ll-opening-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 6px;
  margin-bottom: 8px;
}

.ll-opening-cell {
  flex: 1 1 0;
  min-width: 0;
  margin: 0;
}

.ll-opening-count {
  flex: 0 0 64px;
}

.ll-mini-label {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  color: var(--ll-text-secondary);
}

.ll-opening-times {
  padding-bottom: 12px;
  color: var(--ll-text-secondary);
}

.ll-opening-error {
  flex-basis: 100%;
}

/* ============================================================
   Result card (PRD S4)
   ============================================================ */
.ll-result-hero {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ll-border);
}

.ll-result-hero-value {
  font-size: 36px;
  font-weight: 600;
  color: var(--ll-text);
  box-shadow: inset 0 -8px 0 color-mix(in srgb, var(--ll-accent) 45%, transparent);
}

.ll-result-hero-unit {
  margin-left: 4px;
  font-size: 20px;
  font-weight: 600;
  color: var(--ll-text-secondary);
}

.ll-result-hero-caption {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--ll-text-secondary);
}

.ll-material-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ll-material-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ll-border);
}

.ll-material-name {
  font-weight: 600;
}

.ll-material-qty {
  text-align: right;
  white-space: nowrap;
}

.ll-material-qty .ll-number {
  font-size: 20px;
  font-weight: 600;
}

.ll-material-detail {
  grid-column: 1 / -1;
  font-size: 14px;
  color: var(--ll-text-secondary);
}

.ll-table-wrap {
  margin-top: 16px;
  overflow-x: auto;
}

.ll-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.ll-table th,
.ll-table td {
  padding: 8px 6px;
  border-bottom: 1px solid var(--ll-border);
  text-align: right;
  white-space: nowrap;
}

.ll-table th:first-child,
.ll-table td:first-child {
  text-align: left;
}

.ll-share {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.ll-steps {
  margin: 8px 0 0;
  padding-left: 20px;
}

.ll-steps li {
  margin-bottom: 12px;
}

.ll-step-label {
  display: block;
  font-weight: 600;
}

.ll-step-working,
.ll-step-value {
  display: block;
  font-size: 14px;
  overflow-wrap: anywhere;
}

.ll-step-value {
  color: var(--ll-text-secondary);
}

.ll-disclaimer {
  font-size: 14px;
  color: var(--ll-text-secondary);
}

/* Live answer pinned above the bottom nav (PRD S3 "live result preview"). */
.ll-sticky-summary {
  position: sticky;
  bottom: calc(var(--ll-bottom-nav-height) + env(safe-area-inset-bottom));
  z-index: 1020;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 56px;
  margin: 0 calc(-1 * var(--ll-gutter));
  padding: 8px var(--ll-gutter);
  background: var(--ll-primary);
  color: var(--ll-on-primary);
}

.ll-sticky-summary-text {
  font-family: var(--ll-font-mono);
  font-weight: 600;
}

.ll-sticky-summary-link {
  flex: 0 0 auto;
  min-height: var(--ll-touch);
  display: inline-flex;
  align-items: center;
  color: var(--ll-accent);
  font-weight: 600;
}

.ll-sticky-summary-link:hover {
  color: var(--ll-accent);
}

/* ============================================================
   Calculator list (S2) and home tiles (S1)
   ============================================================ */
.ll-calc-search {
  position: relative;
  margin-bottom: 12px;
}

.ll-calc-search .bi-search {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ll-text-secondary);
}

.ll-calc-search .ll-input {
  padding-left: 40px;
}

.ll-filter-chips {
  margin-bottom: 16px;
}

.ll-calc-group-title {
  margin: 16px 0 8px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ll-text-secondary);
}

.ll-calc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--ll-card);
  border: 1px solid var(--ll-border);
  border-radius: var(--ll-radius-card);
  overflow: hidden;
}

.ll-calc-list li + li {
  border-top: 1px solid var(--ll-border);
}

.ll-calc-row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 64px;
  padding: 8px 16px;
  color: var(--ll-text);
  text-decoration: none;
}

.ll-calc-row:hover {
  color: var(--ll-text);
  background: var(--ll-surface);
}

.ll-calc-row-icon,
.ll-tile-icon {
  font-size: 24px;
  color: var(--ll-primary);
}

.ll-calc-row-text {
  flex: 1 1 auto;
  min-width: 0;
}

.ll-calc-row-name {
  display: block;
  font-weight: 600;
}

.ll-calc-row-desc {
  display: block;
  font-size: 14px;
  color: var(--ll-text-secondary);
}

.ll-calc-row-chevron {
  color: var(--ll-text-secondary);
}

.ll-empty {
  padding: 24px 0;
  text-align: center;
  color: var(--ll-text-secondary);
}

.ll-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
}

.ll-tile-grid {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.ll-tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  min-height: 96px;
  padding: 16px;
  background: var(--ll-card);
  border: 1px solid var(--ll-border);
  border-radius: var(--ll-radius-card);
  color: var(--ll-text);
  text-decoration: none;
  font-weight: 600;
}

.ll-tile:hover {
  color: var(--ll-text);
  border-color: var(--ll-primary);
}

@media (min-width: 576px) {
  .ll-tile-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Desktop: same layout, centred. Hero gets the 36px "hero number" size from the type scale. */
@media (min-width: 768px) {
  .ll-hero-title {
    font-size: 36px;
  }
}