:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --ink: #162033;
  --muted: #6b7280;
  --line: #e8edf5;
  --brand: #0f6abf;
  --brand-2: #0ea5a8;
  --accent: #ff8c42;
  --danger: #d9485f;
  --success: #16a34a;
  --shadow: 0 18px 40px rgba(16, 33, 58, 0.08);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  color: var(--ink);
  -webkit-print-color-adjust: exact;
  print-color-adjust: exact;
  scroll-behavior: smooth;
}

body {
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at 0% 0%, rgba(14, 165, 168, 0.15), transparent 40%),
    radial-gradient(circle at 100% 10%, rgba(15, 106, 191, 0.14), transparent 42%),
    linear-gradient(180deg, #eef4ff 0%, #f7fbff 35%, #f7f7fb 100%);
}

a {
  color: inherit;
}

button,
input,
select,
textarea,
summary {
  font: inherit;
}

.page-shell {
  width: min(1280px, 94vw);
  margin: 28px auto 40px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  background: linear-gradient(135deg, #0a3565, var(--brand) 55%, var(--brand-2));
  color: #fff;
  border-radius: 24px;
  padding: 26px 28px;
  box-shadow: var(--shadow);
}

.hero-content {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.eyebrow {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.85;
}

.hero h1 {
  margin: 0;
  font-family: "Iowan Old Style", "Baskerville", "Georgia", serif;
  font-size: clamp(1.9rem, 2.7vw, 3rem);
  line-height: 1.05;
}

.hero-subtitle,
.hero-proof {
  margin: 0;
}

.hero-subtitle {
  font-weight: 700;
}

.hero-proof {
  max-width: 62ch;
  font-size: 0.95rem;
  opacity: 0.92;
}

.hero-cta-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.hero-perfect-for {
  display: grid;
  gap: 4px;
  margin-top: 4px;
}

.hero-perfect-label {
  font-size: 0.8rem;
  opacity: 0.9;
  font-weight: 700;
}

.hero-perfect-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.hero-perfect-list li {
  font-size: 0.78rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-perfect-list a {
  display: inline-flex;
  padding: 5px 9px;
  text-decoration: none;
}

.hero-actions {
  display: grid;
  gap: 8px;
  align-content: start;
  justify-items: stretch;
  width: min(280px, 100%);
  flex: 0 0 280px;
}

.hero-actions .btn,
.hero-actions .support-link-btn {
  display: flex;
  width: 100%;
  min-height: 44px;
  justify-content: center;
  text-align: center;
}

.btn,
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 9px 12px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease, border-color 120ms ease;
}

.btn:hover,
.icon-btn:hover,
.related-card:hover {
  transform: translateY(-1px);
}

.btn:active,
.icon-btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 10px 24px rgba(15, 106, 191, 0.22);
}

.btn-secondary,
.icon-btn {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.22);
}

.reset-light {
  background: #fff;
  color: var(--ink);
  border-color: var(--line);
}

.support-link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.trip-snapshot {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, #fff, #fbfdff);
  padding: 12px;
}

.trip-snapshot-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.trip-snapshot-head h2,
.trip-snapshot-head p {
  margin: 0;
}

.offline-badge-wrap {
  display: grid;
  gap: 4px;
}

.offline-badge {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  border-radius: 999px;
  border: 1px solid rgba(15, 106, 191, 0.12);
  background: rgba(15, 106, 191, 0.05);
  color: #0a4f8c;
  padding: 5px 10px;
  font-size: 0.76rem;
  font-weight: 800;
}

.offline-badge-note,
.offline-badge-trust {
  font-size: 0.76rem;
  color: var(--muted);
  text-align: right;
}

.trip-snapshot-grid,
.info-grid,
.results-grid,
.comparison-grid,
.chart-grid,
.milestone-grid,
.scenario-grid,
.related-grid {
  display: grid;
  gap: 12px;
}

.trip-snapshot-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.trip-snapshot-item,
.metric-card,
.subsection {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  padding: 12px;
}

.trip-snapshot-item .label,
.metric-card .label,
.mini-label {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
}

.trip-snapshot-item .value,
.metric-card .value,
.big-number {
  display: block;
  font-size: 1.12rem;
  font-weight: 800;
  margin-top: 4px;
}

.trip-snapshot-item .sub,
.metric-card .sub {
  display: block;
  font-size: 0.74rem;
  color: var(--muted);
  margin-top: 2px;
}

.content-stack {
  margin-top: 20px;
  display: grid;
  gap: 18px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 8px 30px rgba(16, 33, 58, 0.04);
  padding: 14px;
}

.section-panel {
  scroll-margin-top: 18px;
}

.panel-header {
  margin-bottom: 12px;
}

.panel-header h2 {
  margin: 0;
  font-size: 1.15rem;
}

.panel-header p,
.subsection p,
.subsection h3 {
  margin-top: 0;
}

.panel-header p {
  margin-bottom: 0;
  color: var(--muted);
}

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

.concept-card {
  background: linear-gradient(180deg, #f8fbff, #ffffff);
}

.concept-math {
  margin: 0 0 8px;
  font-size: 1.2rem;
  font-weight: 800;
  color: #0a4f8c;
}

.calculator-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 16px;
  align-items: start;
}

.calculator-panel,
.results-panel {
  height: 100%;
}

.results-panel {
  position: sticky;
  top: 16px;
}

.activity-form {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.activity-form label {
  display: grid;
  gap: 6px;
  font-size: 0.86rem;
  font-weight: 700;
  color: #324255;
}

.activity-form input,
.activity-form select,
.activity-form textarea {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
  padding: 10px;
}

.activity-form input:focus,
.activity-form select:focus,
.btn:focus,
.support-cta:focus,
summary:focus {
  outline: 2px solid rgba(15, 106, 191, 0.26);
  outline-offset: 2px;
}

.form-span-full {
  grid-column: 1 / -1;
}

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

.inline-help {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 0.74rem;
  font-weight: 800;
  background: #f4f7fb;
  color: #46556b;
  border: 1px solid #e6edf7;
}

.advanced-panel {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fbfdff;
  padding: 12px;
}

.advanced-panel summary {
  cursor: pointer;
  font-weight: 800;
  color: #0a4f8c;
}

.advanced-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.takeaway-card {
  border-radius: 16px;
  padding: 14px;
  background: linear-gradient(135deg, rgba(15, 106, 191, 0.09), rgba(14, 165, 168, 0.08));
  border: 1px solid rgba(15, 106, 191, 0.14);
}

.takeaway-card .label {
  color: #0a4f8c;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.takeaway-headline {
  display: block;
  font-family: "Iowan Old Style", "Baskerville", "Georgia", serif;
  font-size: clamp(1.45rem, 2.1vw, 2rem);
  margin-top: 6px;
}

.results-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 12px;
}

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

.comparison-card {
  display: grid;
  gap: 12px;
}

.comparison-card.is-a {
  background: linear-gradient(180deg, #ffffff, #f6fbff);
}

.comparison-card.is-b {
  background: linear-gradient(180deg, #ffffff, #fffaf6);
}

.comparison-card h3 {
  margin: 0;
}

.comparison-stat-grid,
.scenario-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.comparison-stat,
.scenario-stat,
.milestone-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.82);
}

.comparison-footnote {
  font-size: 0.8rem;
  color: var(--muted);
}

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

.chart-card {
  padding-bottom: 14px;
}

.chart-card h3 {
  margin-bottom: 12px;
}

.chart-frame {
  width: 100%;
  min-height: 250px;
}

.chart-frame svg {
  width: 100%;
  height: auto;
  display: block;
}

.bar-chart {
  display: grid;
  gap: 14px;
}

.bar-row {
  display: grid;
  gap: 6px;
}

.bar-row-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: baseline;
}

.bar-track {
  position: relative;
  height: 18px;
  border-radius: 999px;
  background: #edf3fa;
  overflow: hidden;
}

.bar-fill {
  position: absolute;
  inset: 0 auto 0 0;
  border-radius: inherit;
}

.bar-fill.a {
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
}

.bar-fill.b {
  background: linear-gradient(90deg, #ff8c42, #f4b860);
}

.milestone-bars {
  display: grid;
  gap: 12px;
}

.milestone-bar-row {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 10px;
  align-items: center;
}

.milestone-bar-track {
  height: 12px;
  border-radius: 999px;
  background: #eef2f7;
  overflow: hidden;
}

.milestone-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #ff8c42, #f4b860);
  border-radius: inherit;
}

.milestone-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.milestone-card h3,
.scenario-card h3,
.related-card h3 {
  margin-bottom: 8px;
}

.milestone-difference {
  color: #0a4f8c;
  font-weight: 800;
}

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

.scenario-card {
  display: grid;
  gap: 12px;
}

.scenario-card button {
  justify-self: start;
}

.insight-card {
  background: linear-gradient(180deg, #ffffff, #fbfdff);
}

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

.related-card {
  text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.related-card-static {
  cursor: default;
}

.related-card-static:hover {
  transform: none;
}

.support-panel {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(248, 252, 255, 0.98));
}

.support-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  background: #fff;
}

.support-card p {
  margin: 0;
}

.faq-stack {
  display: grid;
  gap: 12px;
}

.app-footer {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.9);
  padding: 12px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

.footer-branding {
  display: grid;
  gap: 2px;
}

.footer-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.footer-actions a {
  color: #0a4f8c;
  text-decoration: none;
  font-weight: 700;
}

.global-fab-row {
  position: fixed;
  top: auto;
  right: calc(12px + env(safe-area-inset-right, 0px));
  bottom: calc(12px + env(safe-area-inset-bottom, 0px));
  z-index: 1100;
  display: flex;
  align-items: center;
  gap: 8px;
}

.global-support-btn,
.global-save-btn {
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: #fff;
  border-radius: 999px;
  padding: 9px 12px;
  font-weight: 800;
  font-size: 0.8rem;
  box-shadow: 0 10px 24px rgba(15, 106, 191, 0.25);
  text-decoration: none;
}

.global-support-btn {
  background: linear-gradient(135deg, #16a34a, #0ea5a8);
}

.global-save-btn {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
}

.app-toast {
  position: fixed;
  left: 50%;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  background: rgba(22, 32, 51, 0.95);
  color: #fff;
  border-radius: 999px;
  padding: 10px 14px;
  font-size: 0.85rem;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
  z-index: 1200;
}

.muted {
  color: var(--muted);
}

.small-copy {
  font-size: 0.8rem;
}

.no-print {
  display: initial;
}

[hidden] {
  display: none !important;
}

@media (max-width: 1100px) {
  .trip-snapshot-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .calculator-shell {
    grid-template-columns: 1fr;
  }

  .results-panel {
    position: static;
  }

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

@media (max-width: 980px) {
  .hero {
    flex-direction: column;
  }

  .hero-actions {
    width: min(320px, 100%);
    flex: none;
  }

  .info-grid,
  .chart-grid,
  .scenario-grid {
    grid-template-columns: 1fr;
  }

  .trip-snapshot-grid,
  .comparison-grid,
  .milestone-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 640px) {
  .page-shell {
    width: min(100%, 96vw);
    margin-top: 16px;
  }

  .hero {
    padding: 18px;
    border-radius: 18px;
  }

  .trip-snapshot-grid,
  .results-grid,
  .comparison-grid,
  .milestone-grid,
  .related-grid,
  .scenario-grid,
  .info-grid,
  .chart-grid,
  .calculator-form,
  .advanced-grid,
  .comparison-stat-grid,
  .scenario-stat-grid {
    grid-template-columns: 1fr;
  }

  .trip-snapshot-head,
  .support-card,
  .app-footer,
  .bar-row-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .offline-badge-note,
  .offline-badge-trust {
    text-align: left;
  }

  .global-fab-row {
    right: 10px;
    top: auto;
    bottom: 10px;
    flex-direction: column;
    align-items: stretch;
  }

  .global-support-btn,
  .global-save-btn {
    text-align: center;
  }

  .milestone-bar-row {
    grid-template-columns: 56px 1fr;
  }

  .milestone-bar-row .big-number {
    grid-column: 1 / -1;
  }
}

@media print {
  .no-print,
  .global-fab-row,
  .app-footer {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .page-shell {
    width: 100%;
    margin: 0;
  }

  .panel,
  .trip-snapshot,
  .hero {
    box-shadow: none;
  }
}