:root {
  --tectonic: #a61c10;
  --drainage: #0b2f89;
}

* {
  box-sizing: border-box;
}

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

body {
  display: grid;
  grid-template-rows: auto 1fr;
  font-family: var(--font-sans);
  color: var(--color-text);
  background:
    radial-gradient(circle at 14% -8%, rgba(226, 200, 126, 0.08), transparent 45%),
    radial-gradient(circle at 86% 8%, rgba(122, 138, 90, 0.1), transparent 32%),
    var(--color-bg);
  overflow: hidden;
}

/* --- Header --- */

.app-header {
  background: rgba(31, 40, 27, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
  display: flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
}

.title-block {
  border-radius: var(--radius-md);
  border: 1px solid rgba(100, 114, 83, 0.5);
  background: linear-gradient(150deg, var(--color-surface-alt), var(--color-surface));
  box-shadow: var(--shadow-sm);
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.title-block h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 400;
  margin: 0;
}

.back-link {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

.back-link:hover {
  text-decoration: underline;
}

/* --- Main & Map --- */

.app-main {
  position: relative;
  overflow: hidden;
}

#map {
  width: 100%;
  height: 100%;
}

/* --- Panel --- */

.panel {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  z-index: 1000;
  width: min(300px, calc(100vw - 2rem));
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: var(--space-sm);
}

.panel-block {
  display: grid;
  gap: 0.6rem;
  padding-bottom: var(--space-sm);
  border-bottom: 1px dashed var(--color-line);
}

.panel-block:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.panel-title {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-bottom: 0.2rem;
  border-bottom: 1px solid var(--color-line);
}

/* --- Toggle --- */

.toggle {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.92rem;
  cursor: pointer;
}

.toggle input {
  accent-color: var(--color-accent);
  width: 16px;
  height: 16px;
}

/* --- Level Control --- */

.level-buttons {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.level-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-text);
  font-size: 0.75rem;
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease;
}

.level-btn:hover:not(:disabled) {
  background: rgba(226, 200, 126, 0.1);
}

.level-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.level-btn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.level-display {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  min-width: 24px;
  text-align: center;
}

/* --- Legend --- */

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

.legend div {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.swatch {
  display: inline-block;
  width: 26px;
  height: 3px;
  border-radius: 999px;
}

.swatch.tectonic {
  background: var(--tectonic);
  height: 4px;
}

.swatch.drainage {
  background: var(--drainage);
}

/* --- Leaflet Overrides --- */

.leaflet-control-attribution {
  background: rgba(255, 255, 255, 0.72) !important;
  color: #263741;
}

/* --- Responsive --- */

@media (max-width: 680px) {
  .panel {
    top: auto;
    bottom: var(--space-sm);
    left: var(--space-sm);
    right: var(--space-sm);
    width: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}