:root {
  --color-bg: #f8fafc;
  --color-card: #fff;
  --color-text: #1e293b;
  --color-label: #64748b;
  --color-border: #e2e8f0;
  --color-blue: #2563eb;
  --color-blue-hover: #1d4ed8;
  --color-green: #16a34a;
  --color-red: #dc2626;
  --color-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --radius: 0.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-card: #1e293b;
    --color-text: #e2e8f0;
    --color-label: #94a3b8;
    --color-border: #334155;
    --color-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-tap-highlight-color: transparent;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

body {
  max-width: 480px;
  margin: 0 auto;
  padding: 1rem;
}

/* -- Stacked layout -- */

.layout {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* -- Map -- */

.map-container {
  height: 250px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--color-shadow);
  z-index: 0;
}

.btn-show-map {
  width: 100%;
  padding: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--color-blue);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  box-shadow: var(--color-shadow);
  transition: border-color 0.15s ease;
}

.btn-show-map:hover {
  border-color: var(--color-blue);
}

/* -- Card -- */

.card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-align: center;
  padding: 0.75rem 1rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--color-shadow);
}

.card--interactive {
  cursor: pointer;
  transition: border-color 0.15s ease;
}


.card-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-label);
}

.card-value {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.3;
}

.card-sub {
  font-size: 0.8rem;
  color: var(--color-label);
}

.card-sub--subtle {
  font-size: 0.7rem;
}

/* -- Map links -- */

.map-links {
  text-align: center;
  font-size: 0.8rem;
  padding: 0.25rem 0;
}

.map-links a {
  color: var(--color-blue);
  text-decoration: none;
}

.map-links a:hover {
  text-decoration: underline;
}

.map-links-sep {
  color: var(--color-label);
  margin: 0 0.25rem;
}

/* -- Developer section -- */

.dev-section {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card);
}

.dev-section summary {
  padding: 0.6rem 1rem;
  font-size: 0.8rem;
  color: var(--color-label);
  cursor: pointer;
  user-select: none;
}

.dev-section summary:hover {
  color: var(--color-text);
}

.dev-block {
  padding: 0 1rem 0.75rem;
}

.dev-block + .dev-block {
  border-top: 1px solid var(--color-border);
  padding-top: 0.75rem;
}

.dev-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.375rem;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.25rem;
  cursor: pointer;
  color: var(--color-label);
  transition: color 0.15s ease, border-color 0.15s ease;
}

.btn-copy:hover {
  color: var(--color-text);
  border-color: var(--color-text);
}

.dev-section pre {
  overflow-x: auto;
  padding: 0.5rem;
  background: var(--color-bg);
  border-radius: 4px;
  text-align: left;
  white-space: pre;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.75rem;
  line-height: 1.5;
}

/* -- Updated footer -- */

.updated-footer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-label);
  padding: 0.25rem 0;
}

/* -- Centred screens (locating, error, start) -- */

.center-screen {
  display: grid;
  justify-content: center;
  align-content: center;
  height: 100dvh;
}

.center-screen--text {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-label);
}

.btn-primary {
  background: var(--color-blue);
  color: #fff;
  border: none;
  padding: 0.875rem 2rem;
  font-weight: 600;
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background 0.15s ease;
}

.btn-primary:hover {
  background: var(--color-blue-hover);
}

/* -- Toast -- */

.toast {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  width: auto;
  max-width: 90%;
  color: #fff;
  text-align: center;
  border-radius: var(--radius);
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  animation: toast-in 0.2s ease;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(-0.5rem); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.toast--success { background: var(--color-green); }
.toast--error { background: var(--color-red); }

/* -- Hidden utility -- */

.hidden { display: none !important; }