:root {
  --bg-top: #f6f1e8;
  --bg-bottom: #dbe8dc;
  --panel: rgba(247, 242, 233, 0.9);
  --panel-border: rgba(34, 71, 59, 0.14);
  --ink: #14322f;
  --ink-soft: #4b655f;
  --accent: #d76536;
  --accent-dark: #a94a21;
  --map-shadow: 0 24px 60px rgba(19, 50, 47, 0.16);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(215, 101, 54, 0.12), transparent 26%),
    radial-gradient(circle at bottom right, rgba(29, 103, 88, 0.14), transparent 24%),
    linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(20, 50, 47, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 50, 47, 0.018) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.7;
}

.app-shell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(360px, 470px) 1fr;
  gap: 24px;
  min-height: 100%;
  padding: 22px;
}

.panel,
.map-panel {
  position: relative;
  min-height: calc(100vh - 44px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--map-shadow);
}

.panel {
  background: var(--panel);
  backdrop-filter: blur(12px);
}

.panel-inner {
  display: flex;
  flex-direction: column;
  gap: 18px;
  height: 100%;
  padding: 28px;
  overflow-y: auto;
}

.eyebrow {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}

h1,
h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.04;
}

h1 {
  font-size: clamp(2.4rem, 3vw, 3.4rem);
}

h2 {
  font-size: 1.35rem;
}

.intro,
.formula-card p,
.status,
.section-note {
  margin: 0;
  line-height: 1.6;
  color: var(--ink-soft);
}

.mode-switch,
.hero-card,
.data-card,
.metric-card,
.formula-card,
.map-toolbar,
.details-section {
  border: 1px solid rgba(20, 50, 47, 0.12);
  border-radius: var(--radius-lg);
}

.mode-switch {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 8px;
  background: rgba(255, 255, 255, 0.56);
}

.mode-button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 12px 14px;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  color: var(--ink);
  background: transparent;
  transition:
    transform 140ms ease,
    background-color 140ms ease,
    color 140ms ease;
}

.mode-button:hover {
  transform: translateY(-1px);
}

.mode-button.is-active {
  color: #fff7f1;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
}

.hero-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px;
  color: #fff7f1;
  background:
    linear-gradient(145deg, rgba(215, 101, 54, 0.95), rgba(114, 39, 12, 0.88)),
    linear-gradient(120deg, rgba(255, 255, 255, 0.16), transparent 45%);
}

.details-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 14px 18px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(20, 50, 47, 0.12);
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.details-toggle::after {
  content: "−";
  flex: 0 0 auto;
  font-size: 1.2rem;
  line-height: 1;
}

.details-toggle.is-collapsed::after {
  content: "+";
}

.details-content {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.details-content.is-collapsed {
  display: none;
}

.hero-label {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.88;
}

.hero-value {
  font-size: clamp(2rem, 4vw, 2.9rem);
  line-height: 1;
}

.hero-offset {
  font-size: 0.98rem;
  color: rgba(255, 247, 241, 0.84);
}

.hero-subline {
  font-size: 0.94rem;
  line-height: 1.5;
  color: rgba(255, 247, 241, 0.82);
}

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

.data-card,
.metric-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 116px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.44);
}

.metric-card {
  min-height: 108px;
}

.card-label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.data-card strong,
.metric-card strong {
  font-size: 1rem;
  line-height: 1.35;
  white-space: pre-line;
}

.card-note {
  margin-top: auto;
  font-size: 0.9rem;
  line-height: 1.45;
  color: var(--ink-soft);
  white-space: pre-line;
}

.action-row {
  display: flex;
  gap: 12px;
}

button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  transition:
    transform 140ms ease,
    box-shadow 140ms ease,
    background-color 140ms ease;
}

button:hover {
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

.primary-button,
.secondary-button {
  padding: 12px 18px;
  font-weight: 600;
}

.primary-button {
  color: #fff6ef;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  box-shadow: 0 12px 24px rgba(169, 74, 33, 0.18);
}

.secondary-button {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(20, 50, 47, 0.1);
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid rgba(20, 50, 47, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.56);
  font-weight: 500;
}

.toggle-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.details-section {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  background: rgba(250, 247, 241, 0.68);
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.section-pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dark);
  background: rgba(215, 101, 54, 0.12);
}

.section-note {
  padding: 12px 14px;
  border-left: 4px solid rgba(29, 103, 88, 0.35);
  background: rgba(255, 255, 255, 0.5);
  border-radius: 0 14px 14px 0;
}

.formula-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  background: rgba(250, 247, 241, 0.7);
}

.formula-card code {
  display: block;
  padding: 14px;
  overflow-x: auto;
  border-radius: var(--radius-md);
  background: rgba(19, 50, 47, 0.08);
  color: var(--ink);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 0.95rem;
  line-height: 1.6;
  white-space: normal;
}

.status {
  padding: 14px 16px;
  border-left: 4px solid rgba(215, 101, 54, 0.6);
  background: rgba(255, 255, 255, 0.55);
  border-radius: 0 16px 16px 0;
}

.map-panel {
  background:
    radial-gradient(circle at 20% 12%, rgba(255, 255, 255, 0.42), transparent 28%),
    linear-gradient(180deg, #d7ebe6, #b9d8d0);
}

.map-toolbar {
  position: absolute;
  z-index: 1000;
  top: 18px;
  left: 18px;
  right: 18px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  padding: 14px 18px;
  background: rgba(250, 247, 241, 0.78);
  backdrop-filter: blur(12px);
}

.toolbar-pill,
.toolbar-reading {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 12px;
  border-radius: 999px;
}

.toolbar-pill {
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dark);
  background: rgba(215, 101, 54, 0.12);
}

.toolbar-reading {
  margin-left: auto;
  font-weight: 600;
  color: var(--ink);
  background: rgba(20, 50, 47, 0.06);
  white-space: normal;
}

#map {
  width: 100%;
  height: 100%;
  min-height: calc(100vh - 44px);
}

.leaflet-control-zoom a {
  color: var(--ink);
}

.selected-cell {
  fill: rgba(215, 101, 54, 0.18);
  stroke: var(--accent);
  stroke-width: 2;
}

.grid-cell {
  fill: rgba(19, 50, 47, 0.03);
  stroke: rgba(19, 50, 47, 0.24);
  stroke-width: 1;
}

.world-land {
  fill: rgba(247, 242, 233, 0.82);
  stroke: rgba(20, 50, 47, 0.38);
  stroke-width: 1;
}

.graticule-line {
  stroke: rgba(20, 50, 47, 0.16);
  stroke-width: 1;
}

.graticule-label {
  color: rgba(20, 50, 47, 0.7);
  font-size: 11px;
  font-weight: 600;
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.8),
    0 0 6px rgba(255, 255, 255, 0.9);
}

.center-marker {
  stroke: #ffffff;
  stroke-width: 2;
  fill: var(--accent);
  fill-opacity: 1;
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .panel,
  .map-panel {
    min-height: auto;
  }

  #map {
    min-height: 62vh;
  }
}

@media (max-width: 760px) {
  .app-shell {
    padding: 14px;
    gap: 14px;
  }

  .panel-inner {
    padding: 22px 18px;
  }

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

  .action-row,
  .map-toolbar,
  .section-heading {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-reading {
    margin-left: 0;
  }
}