@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Space+Grotesk:wght@500;700&display=swap");

:root {
  --bg-top: #f4efe4;
  --bg-bottom: #dbeaf2;
  --panel: rgba(255, 252, 247, 0.92);
  --panel-strong: #fffdfa;
  --ink: #132238;
  --muted: #59677a;
  --line: rgba(19, 34, 56, 0.12);
  --line-strong: rgba(19, 34, 56, 0.2);
  --brand: #0f4c5c;
  --brand-strong: #093847;
  --accent: #1f7a8c;
  --accent-soft: rgba(31, 122, 140, 0.1);
  --success: #0b7a4d;
  --success-soft: rgba(11, 122, 77, 0.12);
  --warning: #b45f06;
  --warning-soft: rgba(180, 95, 6, 0.14);
  --danger: #b42318;
  --danger-soft: rgba(180, 35, 24, 0.12);
  --info: #1d4ed8;
  --info-soft: rgba(29, 78, 216, 0.1);
  --shadow: 0 20px 48px rgba(15, 27, 48, 0.12);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.75), transparent 38%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
}

[hidden] {
  display: none !important;
}

button,
input,
select {
  font: inherit;
}

a {
  color: var(--brand-strong);
}

.page-shell {
  width: min(1200px, calc(100% - 1.5rem));
  margin: 0 auto;
  padding: 1rem 0 2rem;
}

.hero {
  position: relative;
  padding: 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.94), rgba(245, 250, 252, 0.92)),
    linear-gradient(180deg, rgba(15, 76, 92, 0.08), transparent);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -8rem -8rem auto;
  width: 18rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(31, 122, 140, 0.12);
  filter: blur(10px);
}

.hero__top {
  position: relative;
  display: grid;
  gap: 1rem;
  z-index: 1;
}

.hero__brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.hero__image {
  flex: 0 0 auto;
  width: 80px;
  height: 100px;
  object-fit: contain;
}

.hero__copy h1 {
  margin: 0;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  line-height: 1;
  letter-spacing: -0.03em;
}

.hero__eyebrow,
.card__eyebrow {
  margin: 0 0 0.35rem;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero__lead {
  max-width: 42rem;
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.mode-toggle {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: 1.1rem;
  padding: 0.45rem;
  border: 1px solid rgba(15, 76, 92, 0.12);
  border-radius: 999px;
  background: rgba(15, 76, 92, 0.08);
}

.mode-toggle__button {
  border: 1px solid rgba(15, 76, 92, 0.22);
  border-radius: 999px;
  padding: 0.9rem 1rem;
  background: rgba(255, 255, 255, 0.96);
  color: var(--brand-strong);
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(15, 27, 48, 0.08);
  transition: transform 160ms ease, background 160ms ease, color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.mode-toggle__button:hover,
.mode-toggle__button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(15, 76, 92, 0.45);
  box-shadow: 0 12px 22px rgba(15, 27, 48, 0.12);
  outline: none;
}

.mode-toggle__button.is-active {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 12px 28px rgba(15, 76, 92, 0.24);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.85rem;
  padding: 0.75rem 1rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease, color 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.button--primary {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #ffffff;
  box-shadow: 0 16px 30px rgba(15, 76, 92, 0.2);
}

.button--ghost {
  border-color: rgba(15, 76, 92, 0.16);
  background: rgba(255, 255, 255, 0.7);
  color: var(--brand-strong);
}

main {
  margin-top: 1rem;
}

.mode-panel {
  animation: panel-in 220ms ease;
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mode-grid {
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.card {
  min-width: 0;
  padding: 1.1rem;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.card__header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.card__header h2 {
  margin: 0;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  letter-spacing: -0.02em;
}

.field-grid {
  display: grid;
  gap: 0.9rem;
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field span {
  font-size: 0.93rem;
  font-weight: 700;
}

.field__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.field__status {
  flex: 0 0 auto;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
}

.field__hint {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.45;
}

.field input,
.field select,
.passenger-row input,
.aircraft-config-card input,
.aircraft-config-card select {
  width: 100%;
  min-height: 3rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.86);
  color: var(--ink);
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.field input:focus-visible,
.field select:focus-visible,
.passenger-row input:focus-visible,
.aircraft-config-card input:focus-visible,
.aircraft-config-card select:focus-visible {
  border-color: rgba(31, 122, 140, 0.6);
  box-shadow: 0 0 0 4px rgba(31, 122, 140, 0.14);
  outline: none;
}

.assumption-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  line-height: 1.65;
}

.metric-list {
  display: grid;
  gap: 0.8rem;
}

.metric {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.58);
}

.metric__label {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.metric__value {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ink);
}

.metric__note {
  font-size: 0.82rem;
  color: var(--muted);
}

.metric--danger {
  border-color: rgba(180, 35, 24, 0.22);
  background: var(--danger-soft);
}

.metric--danger .metric__value {
  color: var(--danger);
}

.status-list {
  display: grid;
  gap: 0.75rem;
}

.status-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.8rem;
  align-items: start;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.62);
}

.status-item__dot {
  width: 0.9rem;
  height: 0.9rem;
  margin-top: 0.25rem;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 6px currentColor;
  opacity: 0.18;
}

.status-item__content {
  display: grid;
  gap: 0.1rem;
}

.status-item__title {
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-item__text {
  font-size: 0.98rem;
  font-weight: 700;
}

.status-item--success {
  color: var(--success);
  border-color: rgba(11, 122, 77, 0.15);
  background: var(--success-soft);
}

.status-item--warning {
  color: var(--warning);
  border-color: rgba(180, 95, 6, 0.18);
  background: var(--warning-soft);
}

.status-item--danger {
  color: var(--danger);
  border-color: rgba(180, 35, 24, 0.16);
  background: var(--danger-soft);
}

.status-item--info {
  color: var(--info);
  border-color: rgba(29, 78, 216, 0.15);
  background: var(--info-soft);
}

.table-shell {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 42rem;
}

.data-table th,
.data-table td {
  padding: 0.85rem 0.9rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  position: sticky;
  top: 0;
  background: rgba(245, 250, 252, 0.96);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.data-table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.42);
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4.6rem;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.pill--ok {
  color: var(--success);
  background: var(--success-soft);
}

.pill--alert {
  color: var(--danger);
  background: var(--danger-soft);
}

.helper-text,
.validation-note,
.footer p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1rem;
}

.toggle-row {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
  font-weight: 800;
  color: var(--brand-strong);
}

.toggle-row input {
  width: 1.1rem;
  height: 1.1rem;
}

.aircraft-picker-list {
  display: grid;
  gap: 0.45rem;
  max-height: 15rem;
  overflow-y: auto;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.86);
}

.aircraft-picker__option {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.7rem;
  padding: 0.7rem 0.2rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}

.aircraft-picker__option:last-child {
  border-bottom: 0;
}

.aircraft-picker__option input {
  width: 1.05rem;
  height: 1.05rem;
  min-height: auto;
  margin: 0;
  padding: 0;
}

.aircraft-picker__name {
  min-width: 0;
}

.aircraft-picker__meta {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
}

.passenger-head,
.passenger-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(132px, 160px);
  gap: 0.75rem;
}

.passenger-head {
  margin-bottom: 0.6rem;
  padding: 0 0.2rem;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--muted);
}

.passenger-list,
.aircraft-config-list {
  display: grid;
  gap: 0.75rem;
}

.passenger-row {
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.6);
}

.aircraft-config-card {
  display: grid;
  gap: 0.9rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.68);
}

.aircraft-config-card__top {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 0.75rem;
}

.aircraft-config-card__name {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 800;
}

.aircraft-config-card__weight {
  font-size: 0.88rem;
  color: var(--muted);
}

.aircraft-config-card__fields {
  display: grid;
  gap: 0.8rem;
}

.aircraft-config-card.is-invalid {
  border-color: rgba(180, 95, 6, 0.28);
  background: rgba(255, 248, 239, 0.92);
}

.aircraft-config-card.is-valid {
  border-color: rgba(11, 122, 77, 0.24);
  background: rgba(246, 255, 250, 0.95);
}

.validation-note {
  min-height: 1.3rem;
  font-size: 0.84rem;
}

.validation-note--warning {
  color: var(--warning);
  font-weight: 700;
}

.validation-note--success {
  color: var(--success);
  font-weight: 700;
}

.status-banner {
  margin-bottom: 1rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 700;
}

.status-banner.is-hidden {
  display: none;
}

.status-banner--info {
  color: var(--brand-strong);
  background: var(--accent-soft);
}

.status-banner--danger {
  color: var(--danger);
  background: var(--danger-soft);
}

.footer {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 0 0;
}

.footer__credit {
  font-size: 0.82rem;
}

.footer__credit a {
  text-decoration: none;
}

.footer__credit a:hover,
.footer__credit a:focus-visible {
  text-decoration: underline;
}

.load-overlay {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(7, 20, 32, 0.58);
  backdrop-filter: blur(8px);
  z-index: 50;
}

.load-overlay.is-active {
  display: flex;
}

.load-card {
  width: min(30rem, 100%);
  padding: 1.5rem;
  border-radius: 28px;
  background: var(--panel-strong);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.25);
}

.load-card h2 {
  margin: 0;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: clamp(1.4rem, 4vw, 2rem);
}

.load-card p {
  margin: 0.75rem 0 0;
  color: var(--muted);
}

.noscript-banner {
  padding: 0.9rem 1rem;
  background: var(--danger);
  color: #ffffff;
  text-align: center;
  font-weight: 800;
}

.empty-state {
  padding: 1rem;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-md);
  color: var(--muted);
  text-align: center;
}

@media (min-width: 700px) {
  .field-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .aircraft-config-card__fields {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 980px) {
  .page-shell {
    width: min(1280px, calc(100% - 2rem));
    padding-top: 1.25rem;
  }

  .hero {
    padding: 1.5rem;
  }

  .hero__top {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
  }

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

  .mode-grid--multi {
    grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
    align-items: start;
  }

  .card--wide {
    grid-column: 1 / -1;
  }

  .mode-grid--multi .card--wide:nth-of-type(2) {
    grid-column: 2 / 3;
  }

  .mode-grid--multi .card--wide:nth-of-type(3) {
    grid-column: 1 / -1;
  }

  .mode-grid--multi .card--wide:nth-of-type(4) {
    grid-column: 1 / -1;
  }
}

@media (max-width: 699px) {
  .hero__brand {
    align-items: start;
  }

  .hero__image {
    width: 64px;
    height: 80px;
  }

  .passenger-head {
    display: none;
  }

  .passenger-row,
  .aircraft-config-card__fields {
    grid-template-columns: 1fr;
  }

  .data-table {
    min-width: 34rem;
  }
}