/* ── VARIABLES ─────────────────────────────────────────────── */
:root {
  --bg:        #0d1117;
  --bg2:       #161b22;
  --bg3:       #1c2128;
  --bg4:       #21262d;
  --border:    #30363d;
  --accent:    #58a6ff;
  --accent-dim:rgba(88,166,255,.12);
  --green:     #3fb950;
  --green-dim: rgba(63,185,80,.12);
  --amber:     #d29922;
  --amber-dim: rgba(210,153,34,.12);
  --red:       #f85149;
  --red-dim:   rgba(248,81,73,.12);
  --col-a:     #58a6ff;
  --col-b:     #bc8cff;
  --text:      #e6edf3;
  --text2:     #8b949e;
  --text3:     #484f58;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── LAYOUT ─────────────────────────────────────────────────── */
.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 20px 16px 48px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ── HEADER ─────────────────────────────────────────────────── */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 4px;
}
.app-header h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}
.proto-badge {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text3);
  display: block;
  margin-top: 2px;
}
.provider-tag {
  font-size: 12px;
  color: var(--text3);
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 10px;
  white-space: nowrap;
  margin-top: 4px;
}

/* ── DISCLAIMER ─────────────────────────────────────────────── */
.disclaimer {
  display: flex;
  gap: 10px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 13px;
  color: var(--text2);
  line-height: 1.55;
}
.disclaimer-icon {
  font-size: 16px;
  flex-shrink: 0;
  color: var(--accent);
  margin-top: 1px;
}

/* ── CARDS ──────────────────────────────────────────────────── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 11px;
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ── GPS DOT ────────────────────────────────────────────────── */
.gps-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text3);
  flex-shrink: 0;
}
.gps-dot.active  { background: var(--green); box-shadow: 0 0 6px var(--green); }
.gps-dot.loading { background: var(--amber); }
.gps-dot.error   { background: var(--red); }

/* ── POSITION GRID ──────────────────────────────────────────── */
.position-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.pos-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
}
.pos-row:last-child { border-bottom: none; }
.pos-label { font-size: 13px; color: var(--text2); }
.pos-value {
  font-size: 13px;
  font-family: 'SF Mono', 'Courier New', monospace;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

/* ── ALERTS ─────────────────────────────────────────────────── */
.alert {
  border-radius: 8px;
  padding: 11px 14px;
  font-size: 13px;
  line-height: 1.55;
}
.alert-error   { background: var(--red-dim);   border: 1px solid rgba(248,81,73,.3);   color: var(--red);   }
.alert-warning { background: var(--amber-dim); border: 1px solid rgba(210,153,34,.3); color: var(--amber); }

/* ── BUTTONS ────────────────────────────────────────────────── */
.btn {
  padding: 12px 16px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity .12s, transform .08s;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(0.97); opacity: .8; }
.btn:disabled { opacity: .35; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--accent);
  color: #0d1117;
  width: 100%;
}
.btn-point-a {
  flex: 1;
  background: rgba(88,166,255,.15);
  color: var(--col-a);
  border: 1px solid rgba(88,166,255,.3);
  font-size: 14px;
}
.btn-point-b {
  flex: 1;
  background: rgba(188,140,255,.15);
  color: var(--col-b);
  border: 1px solid rgba(188,140,255,.3);
  font-size: 14px;
}
.btn-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.btn-row .btn-point-a,
.btn-row .btn-point-b {
  /* side-by-side */
}

/* Make A/B buttons inline */
@media (min-width: 380px) {
  .btn-row {
    flex-wrap: wrap;
  }
  .btn-row .btn-primary { width: 100%; }
  .btn-row .btn-point-a,
  .btn-row .btn-point-b { flex: 1; }

  /* arrange them in a row */
  .btn-row { flex-direction: row; }
  .btn-row .btn-primary { flex: 0 0 100%; order: -1; }
}

/* ── CHECKPOINTS ────────────────────────────────────────────── */
.checkpoints-grid {
  display: flex;
  align-items: center;
  gap: 10px;
}
.checkpoint {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  min-height: 76px;
}
.checkpoint.set-a { border-color: rgba(88,166,255,.4); }
.checkpoint.set-b { border-color: rgba(188,140,255,.4); }

.cp-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 5px;
}
.label-a { color: var(--col-a); }
.label-b { color: var(--col-b); }

.cp-coords {
  font-size: 12px;
  color: var(--text2);
  font-family: 'SF Mono', 'Courier New', monospace;
  line-height: 1.6;
  word-break: break-all;
}
.cp-coords.empty { color: var(--text3); font-family: inherit; font-style: italic; }

.cp-arrow {
  font-size: 20px;
  color: var(--text3);
  flex-shrink: 0;
}

/* ── ACTIONS ────────────────────────────────────────────────── */
.actions-row {
  display: flex;
  gap: 10px;
}
.btn-route {
  flex: 1;
  background: var(--green);
  color: #0d1117;
  font-size: 15px;
}
.btn-reset {
  padding: 12px 18px;
  background: var(--red-dim);
  color: var(--red);
  border: 1px solid rgba(248,81,73,.25);
  font-size: 14px;
}

/* ── RESULTS ────────────────────────────────────────────────── */
.results-placeholder {
  font-size: 14px;
  color: var(--text3);
  text-align: center;
  padding: 12px 0;
}

.result-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.result-row:last-child { border-bottom: none; }
.result-row-meta { background: var(--bg3); }

.result-label { font-size: 13px; color: var(--text2); }
.result-value {
  font-size: 14px;
  font-weight: 600;
  font-family: 'SF Mono', 'Courier New', monospace;
  color: var(--text);
}
.result-value.highlight { color: var(--green); font-size: 16px; }
.result-value.meta      { font-size: 12px; color: var(--text2); font-weight: 400; }

/* ── LOADING ────────────────────────────────────────────────── */
.loading {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text2);
  justify-content: center;
  padding: 8px 0;
}
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── GEOMETRY DETAILS ───────────────────────────────────────── */
.geom-summary {
  font-size: 13px;
  color: var(--text2);
  cursor: pointer;
  padding: 6px 0;
  user-select: none;
}
.geom-pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  font-size: 11px;
  overflow-x: auto;
  color: var(--text2);
  margin-top: 6px;
  max-height: 200px;
  overflow-y: auto;
}

/* ── MANUAL COORDINATE INPUT ────────────────────────────────── */
.manual-section {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.manual-heading {
  font-size: 11px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 2px;
}
.manual-row {
  display: flex;
  gap: 6px;
  align-items: center;
}
.manual-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  width: 14px;
  flex-shrink: 0;
  text-align: center;
}
.coord-input {
  flex: 1;
  min-width: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: 'SF Mono', 'Courier New', monospace;
  font-size: 12px;
  padding: 8px 8px;
  -moz-appearance: textfield;
}
.coord-input::-webkit-inner-spin-button,
.coord-input::-webkit-outer-spin-button { -webkit-appearance: none; }
.coord-input:focus { outline: none; border-color: var(--accent); }
.coord-input::placeholder { color: var(--text3); font-family: inherit; }

.btn-set {
  padding: 8px 11px;
  font-size: 13px;
  white-space: nowrap;
  width: auto;
  max-width: none;
  flex-shrink: 0;
}

/* ── UTILITIES ──────────────────────────────────────────────── */
.hidden { display: none !important; }