:root {
  --water: #1899a8;
  --water-dark: #117783;
  --water-light: #5fc4cf;
  --stone: #5a636b;
  --stone-light: #e7ebee;
  --bg: #f4f7f8;
  --surface: #ffffff;
  --text: #20292e;
  --text-muted: #5a636b;
  --border: #d3dadf;
  --danger: #b3261e;
  --warn-bg: #fff4e5;
  --warn-text: #7a4a00;
  --shadow: 0 2px 10px rgba(17, 119, 131, 0.10);
  --radius: 14px;
  --focus: #0b6f7b;
}

[data-theme="dark"] {
  --water: #36b9c8;
  --water-dark: #1899a8;
  --water-light: #6fd4df;
  --stone: #9aa3ab;
  --stone-light: #2a3137;
  --bg: #11171b;
  --surface: #1a2227;
  --text: #eef3f5;
  --text-muted: #a9b3ba;
  --border: #2e383f;
  --danger: #ff8a82;
  --warn-bg: #2e2718;
  --warn-text: #f0c98a;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  --focus: #6fd4df;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-text-size-adjust: 100%;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--water);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 50;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.85rem 1rem;
  background: linear-gradient(120deg, var(--water), var(--water-dark));
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { display: flex; align-items: center; gap: 0.6rem; min-width: 0; }
.brand-logo { display: block; flex: none; }
.app-header h1 {
  font-size: 1.15rem;
  margin: 0;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.icon-btn {
  background: rgba(255, 255, 255, 0.18);
  border: none;
  color: #fff;
  width: 40px; height: 40px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  flex: none;
  display: grid;
  place-items: center;
}
.icon-btn:hover { background: rgba(255, 255, 255, 0.30); }

.app-main {
  flex: 1;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}
.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
  color: var(--water-dark);
}
[data-theme="dark"] .card h2 { color: var(--water-light); }

.mode-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
  flex-wrap: wrap;
}
.mode-btn {
  flex: 1 1 auto;
  min-width: 120px;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 10px;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
}
.mode-btn.is-active {
  background: var(--water);
  color: #fff;
  border-color: var(--water);
}

.panel { margin-bottom: 0.5rem; }
.panel[hidden] { display: none; }

.hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
  font-size: 0.92rem;
}

input[type="text"] {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
}
input[type="text"]:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 1px;
  border-color: var(--water);
}

.field-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin: 0.4rem 0 0;
}

.btn {
  display: inline-block;
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.8rem 1rem;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}
.btn.primary { background: var(--water); color: #fff; }
.btn.primary:hover { background: var(--water-dark); }
.btn.primary:disabled { opacity: 0.6; cursor: progress; }
.btn.ghost {
  width: auto;
  margin: 0;
  background: transparent;
  border: 1px solid currentColor;
  color: var(--water-dark);
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}
[data-theme="dark"] .btn.ghost { color: var(--water-light); }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.radius-row {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 0.85rem 0 0;
  padding: 0.6rem 0.8rem 0.8rem;
}
.radius-row legend {
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0 0.3rem;
}
.radio {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-right: 1rem;
  font-weight: 500;
  cursor: pointer;
}

.status {
  font-size: 0.95rem;
  color: var(--text);
}
.status.is-error { color: var(--danger); font-weight: 600; }
.status.is-busy { color: var(--water-dark); }
[data-theme="dark"] .status.is-busy { color: var(--water-light); }

.offline-note {
  margin-top: 0.6rem;
  padding: 0.6rem 0.75rem;
  background: var(--warn-bg);
  color: var(--warn-text);
  border-radius: 10px;
  font-size: 0.88rem;
}
.offline-note[hidden] { display: none; }

.results-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}
.results-meta[hidden] { display: none; }

.results-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.result-item {
  border: 1px solid var(--border);
  border-left: 4px solid var(--water);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  background: var(--bg);
}
.result-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.result-name {
  font-weight: 700;
  overflow-wrap: anywhere;
}
.result-dist {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--water-dark);
  white-space: nowrap;
}
[data-theme="dark"] .result-dist { color: var(--water-light); }
.result-coords {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0.25rem 0 0.5rem;
  overflow-wrap: anywhere;
}
.result-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.result-links a {
  color: var(--water-dark);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
[data-theme="dark"] .result-links a { color: var(--water-light); }
.result-links a:hover { opacity: 0.8; }

.empty-note {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0;
}
.empty-note[hidden] { display: none; }

.source-card p { margin: 0 0 0.6rem; font-size: 0.9rem; }
.source-card p:last-child { margin-bottom: 0; }
.source-card .warn {
  background: var(--warn-bg);
  color: var(--warn-text);
  padding: 0.6rem 0.75rem;
  border-radius: 10px;
}
code {
  background: var(--stone-light);
  padding: 0.05rem 0.35rem;
  border-radius: 5px;
  font-size: 0.85em;
  overflow-wrap: anywhere;
}

.app-footer {
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(1.2rem + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  background: var(--stone);
  color: #fff;
  padding: 0.8rem 1.1rem;
  border-radius: 12px;
  max-width: 90vw;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  z-index: 100;
  font-size: 0.92rem;
  text-align: center;
}
.toast.is-error { background: var(--danger); }
.toast[hidden] { display: none; }

@media (max-width: 380px) {
  .app-header h1 { font-size: 1rem; }
  .mode-btn { min-width: 0; }
  .radio { margin-right: 0.7rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}