:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #f8f9fb;
  --text: #17191d;
  --text-muted: #6b7280;
  --border: #e4e7ec;
  --primary: #656698;
  --primary-strong: #44456e;
  --primary-ink: #ffffff;
  --accent: #e8890c;
  --danger: #d64545;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 10px 30px rgba(16, 24, 40, 0.14);
  --radius: 14px;
  --radius-sm: 10px;
  --header-h: auto;
  --tabbar-h: 60px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
}

/* ---------- Loading bar ---------- */
.loading-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  z-index: 100;
  overflow: hidden;
  background: transparent;
}
.loading-bar::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 40%;
  background: var(--primary);
  border-radius: 3px;
  animation: loading-slide 1s ease-in-out infinite;
}
.loading-bar[hidden] {
  display: none;
}
@keyframes loading-slide {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(350%);
  }
}

/* ---------- Header ---------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: calc(10px + env(safe-area-inset-top, 0px)) 16px 10px;
}
.app-header__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  margin: 0;
  display: flex;
  align-items: center;
  min-width: 0;
}
.brand__img {
  display: block;
  height: 30px;
  width: auto;
  max-width: 100%;
}
.chip {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  max-width: 45%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.chip:hover {
  background: var(--bg);
}
.chip--self {
  border-color: var(--primary);
  color: var(--primary);
}
.app-header__filters {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 10px 14px;
  margin-top: 10px;
}
.field.field--inline {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
  min-width: 0;
}
.field--grow {
  flex: 1 1 14em;
  width: 14em;
  min-width: 4em;
  max-width: 100%;
}
.field--grow .select {
  /* The field's explicit width, not the option text, decides the size here;
     otherwise switching to a year with fewer carriers shrinks the select and
     the header filters reflow. */
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  max-width: 100%;
}

/* ---------- Main / views ---------- */
.app-main {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
.view {
  display: none;
  flex: 1 1 auto;
  min-height: 0;
}
.view.is-active {
  display: flex;
  flex-direction: column;
}
.view--scroll {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 14px 14px calc(var(--tabbar-h) + var(--safe-bottom) + 24px);
}
.view--map {
  overflow: hidden;
  padding-bottom: calc(var(--tabbar-h) + var(--safe-bottom));
}
.map {
  flex: 1 1 auto;
  width: 100%;
  height: 100%;
  min-height: 0;
  background: #dfe6ee;
}

/* ---------- Tab bar ---------- */
.tabbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  display: flex;
  height: calc(var(--tabbar-h) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.tabbar__tab {
  flex: 1 1 0;
  appearance: none;
  border: 0;
  background: transparent;
  color: #8a8c92;
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  cursor: pointer;
}
.tabbar__tab.is-active {
  color: var(--primary-strong);
  font-weight: 700;
}
.tabbar__tab span {
  line-height: 1;
}

/* ---------- Cards / tiles ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 16px;
  margin-bottom: 14px;
}
.card__title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.hero__item {
  text-align: center;
  padding: 8px 4px;
}
.hero__value {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.hero__label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 4px;
}

.grid-tiles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.tile {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
}
.tile__value {
  font-size: 22px;
  font-weight: 800;
}
.tile__label {
  font-size: 12px;
  color: var(--text-muted);
}

/* ---------- Lists ---------- */
.stat-list {
  display: flex;
  flex-direction: column;
}
.stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.stat-row:last-child {
  border-bottom: 0;
}
.stat-row__label {
  min-width: 0;
}
.stat-row__name {
  font-weight: 600;
}
.stat-row__sub {
  font-size: 12px;
  color: var(--text-muted);
}
.stat-row__value {
  text-align: right;
  flex: 0 0 auto;
}
.stat-row__value strong {
  font-size: 15px;
}

.bars {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.bar {
  display: grid;
  grid-template-columns: 84px 1fr auto;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}
.bar__label {
  color: var(--text);
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.bar__track {
  height: 8px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
}
.bar__fill {
  height: 100%;
  border-radius: 999px;
  background: var(--primary);
  min-width: 2px;
}
.bar__value {
  color: var(--text-muted);
  text-align: right;
  white-space: nowrap;
}

.extreme-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.extreme {
  text-align: center;
  padding: 8px 2px;
}
.extreme__dir {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.extreme__code {
  font-size: 18px;
  font-weight: 800;
}

/* ---------- Flights ---------- */
.flights-toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.search {
  flex: 1 1 auto;
  min-width: 0;
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font: inherit;
  color: var(--text);
}
.search:focus,
.input:focus,
.select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(101, 102, 152, 0.15);
}
.select {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 9px 10px;
  font: inherit;
  color: var(--text);
}
.flight-count {
  margin: 0 0 10px;
  font-size: 12px;
  color: var(--text-muted);
}
.airport-filter {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  align-self: flex-start;
  margin: 0 0 10px;
  padding: 4px 4px 4px 12px;
  border: 1px solid var(--primary);
  border-radius: 999px;
  background: rgba(101, 102, 152, 0.08);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
}
.airport-filter[hidden] {
  display: none;
}
.airport-filter__clear {
  appearance: none;
  border: 0;
  background: transparent;
  color: inherit;
  width: 22px;
  height: 22px;
  padding: 0;
  border-radius: 999px;
  font-size: 11px;
  line-height: 1;
  cursor: pointer;
}
.airport-filter__clear:hover {
  background: rgba(101, 102, 152, 0.15);
}
.flight-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.flight-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 14px;
}
.flight-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}
.flight-card__route {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.mode-icon {
  flex: 0 0 auto;
}
.flight-card__date {
  text-align: right;
  font-size: 12px;
  color: var(--text-muted);
  flex: 0 0 auto;
}
.flight-card__date.is-future {
  color: var(--primary);
  font-weight: 700;
}
.flight-card__meta {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
}
.flight-card__note {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
}
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
}
.badge--accent {
  background: rgba(232, 137, 12, 0.12);
  border-color: rgba(232, 137, 12, 0.4);
  color: #b26a00;
}

.empty {
  text-align: center;
  padding: 40px 16px;
  color: var(--text-muted);
}
.error-card {
  background: #fdecec;
  border: 1px solid #f5c6c6;
  color: #a12626;
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
}
.error-card__actions {
  margin-top: 12px;
}

/* ---------- Sheet / dialog ---------- */
.sheet-backdrop {
  position: fixed;
  inset: 0;
  /* Above OpenLayers' map layers/controls (its control z-index base is 1000),
     otherwise the sheet renders underneath the map. */
  z-index: 2000;
  background: rgba(16, 24, 40, 0.5);
}
.sheet-backdrop[hidden],
.sheet[hidden] {
  display: none;
}
.sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2001;
  background: var(--surface);
  border-radius: 20px 20px 0 0;
  box-shadow: var(--shadow-md);
  max-height: 85vh;
  overflow-y: auto;
  padding-bottom: calc(20px + var(--safe-bottom));
  animation: sheet-up 0.22s ease;
}
@keyframes sheet-up {
  from {
    transform: translateY(30px);
    opacity: 0.6;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}
.sheet__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px 0;
}
.sheet__header h2 {
  margin: 0;
  font-size: 18px;
}
.icon-btn {
  appearance: none;
  border: 0;
  background: var(--surface-2);
  color: var(--text);
  width: 34px;
  height: 34px;
  border-radius: 999px;
  font-size: 15px;
  cursor: pointer;
}
.sheet__body {
  padding: 8px 18px 4px;
}
.sheet__status {
  font-size: 13px;
  color: var(--text-muted);
  margin: 4px 0 12px;
}
.sheet__section {
  border-top: 1px solid var(--border);
  padding: 14px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.sheet__section h3 {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.sheet__section--actions {
  flex-direction: row;
}

/* Airport chooser (bottom sheet) */
.chooser-list {
  display: flex;
  flex-direction: column;
  margin-top: 4px;
}
.chooser-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 12px 4px;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.chooser-row:last-child {
  border-bottom: 0;
}
.chooser-row:hover {
  background: var(--surface-2);
}
.chooser-row__main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.chooser-row__name {
  font-weight: 600;
  overflow-wrap: anywhere;
}
.chooser-row__sub {
  font-size: 12px;
  color: var(--text-muted);
}
.chooser-row__count {
  flex: 0 0 auto;
  font-weight: 700;
}
.chooser-zoom {
  width: 100%;
  margin-bottom: 10px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field__label {
  font-size: 13px;
  font-weight: 600;
}
.input {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 11px 12px;
  font: inherit;
  color: var(--text);
}
.muted {
  color: var(--text-muted);
  font-weight: 400;
}

/* ---------- Buttons ---------- */
.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s ease;
}
.btn:hover {
  background: var(--bg);
}
.btn--primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-ink);
}
.btn--primary:hover {
  background: #565781;
}
.btn--ghost {
  background: transparent;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--tabbar-h) + var(--safe-bottom) + 18px);
  transform: translateX(-50%) translateY(20px);
  background: rgba(23, 25, 29, 0.94);
  color: #fff;
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  max-width: 90%;
  text-align: center;
  z-index: 2100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- Responsive ---------- */
@media (min-width: 720px) {
  body {
    align-items: center;
  }
  .brand__img {
    height: 34px;
  }
  .app-header,
  .app-main {
    width: 100%;
    max-width: 960px;
  }
  .app-header {
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
  }
  /* Keep the navigation aligned with the app shell, with the tabs grouped in
     the centre instead of stretching across a wide screen. */
  .tabbar {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    width: 100%;
    max-width: 960px;
    justify-content: center;
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
  }
  .tabbar__tab {
    flex: 0 1 220px;
  }

  .view--scroll {
    padding: 20px 20px calc(var(--tabbar-h) + var(--safe-bottom) + 24px);
  }

  /* Overview: use the width for a two-column card grid, with the summary
     card spanning the full row. */
  #view-overview.is-active {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-content: start;
    gap: 14px;
  }
  #view-overview.is-active > * {
    margin-bottom: 0;
  }
  #view-overview.is-active > .card:first-child,
  #view-overview.is-active > .error-card,
  #view-overview.is-active > .empty {
    grid-column: 1 / -1;
  }

  /* Flights: two cards per row. */
  .flight-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }
  .flight-list > .empty {
    grid-column: 1 / -1;
  }

  .sheet {
    max-width: 560px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 20px;
    bottom: 40px;
  }
  @keyframes sheet-up {
    from {
      transform: translateX(-50%) translateY(30px);
      opacity: 0.6;
    }
    to {
      transform: translateX(-50%) translateY(0);
      opacity: 1;
    }
  }
}

/* Laptops and desktops: put the header (brand, filters, login) on one row
   and add a third column once there is enough width for it. */
@media (min-width: 900px) {
  .app-header {
    display: flex;
    align-items: center;
    gap: 20px;
  }
  /* Let the brand and login button take part in the header's flex row so
     they can sit on either side of the filters. */
  .app-header__row {
    display: contents;
  }
  .brand {
    flex: 1 1 auto;
  }
  .app-header__filters {
    flex: 0 1 auto;
    margin-top: 0;
    order: 1;
  }
  .chip {
    flex: 0 0 auto;
    order: 2;
  }
}

@media (min-width: 1180px) {
  .app-header,
  .app-main,
  .tabbar {
    max-width: 1320px;
  }
  #view-overview.is-active,
  .flight-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- Airport popup ---------- */
.olPopup {
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}
.olPopupContent {
  /* OpenLayers measures the content div and then adds its padding on top;
     with the app's global border-box sizing that leaves dead space to the
     right and below the content, so padding lives on the inner element. */
  padding: 0;
  overflow: visible;
  color: var(--text);
  font-size: 13px;
  line-height: 1.35;
}
.airport-popup {
  position: relative;
  min-width: 180px;
  padding: 10px 12px;
}
.airport-popup__close {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
}
.airport-popup__close:hover {
  background: var(--border);
}
.airport-popup__name {
  padding-right: 20px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.25;
}
.airport-popup__meta {
  margin-top: 2px;
  font-size: 12px;
  color: var(--text-muted);
}

.airport-popup__btn {
  display: block;
  width: 100%;
  margin-top: 8px;
}

/* ---------- OpenLayers controls ---------- */
/* Subset of the OpenLayers default theme (as inlined in openflights.css),
   with absolute image paths since the map loads its assets from /img/. */

div.olLayerDiv {
  -moz-user-select: none;
  text-align: left;
}

.olControlAttribution {
  font-size: smaller;
  right: 4px;
  bottom: 4px;
  position: absolute;
  display: block;
  max-width: calc(100% - 90px);
  text-align: right;
}

.olControlScaleLine {
  left: 10px;
  bottom: 15px;
  font-size: xx-small;
}

.olControlScaleLineBottom {
  border: solid 2px black;
  border-bottom: none;
  margin-top: -2px;
  text-align: center;
}

.olControlScaleLineTop {
  border: solid 2px black;
  border-top: none;
  text-align: center;
}

.olControlLayerSwitcher {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 20em;
  font-family: sans-serif;
  font-weight: bold;
  font-size: smaller;
  color: white;
  background-color: transparent;
}

.olControlLayerSwitcher .layersDiv {
  padding: 5px 10px;
  background-color: var(--primary);
}

.olControlLayerSwitcher .layersDiv .baseLbl,
.olControlLayerSwitcher .layersDiv .dataLbl {
  margin: 3px;
}

.olControlLayerSwitcher .layersDiv .baseLayersDiv,
.olControlLayerSwitcher .layersDiv .dataLayersDiv {
  padding-left: 10px;
}

.olControlLayerSwitcher .maximizeDiv,
.olControlLayerSwitcher .minimizeDiv {
  width: 18px;
  height: 18px;
  top: 5px;
  right: 0;
  cursor: pointer;
}

.olPopupCloseBox {
  background: url("/img/close.gif") no-repeat;
  cursor: pointer;
}

.olControlNoSelect {
  -moz-user-select: none;
}