:root {
  --ink: #16233a;
  --ink-soft: #4a5670;
  --ink-muted: #8b93a7;
  --line: #e4e8f0;
  --line-strong: #cdd4e2;
  --surface: #ffffff;
  --canvas: #f4f6fb;
  --accent-1: #2b4c8c;
  --accent-2: #1f9e8f;
  --accent-tint: #eaf1fb;
  --accent-text: #1e3f78;
  --success: #1f9e6f;
  --success-tint: #e6f7f1;
  --warn: #d97706;
  --danger: #c94b4b;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 6%, rgba(43, 76, 140, 0.14), transparent 45%),
    radial-gradient(circle at 92% 10%, rgba(31, 158, 143, 0.12), transparent 50%),
    var(--canvas);
  padding: 2.5rem 1.5rem 4rem;
  -webkit-font-smoothing: antialiased;
}

.shell { max-width: 620px; margin: 0 auto; }

.top { text-align: center; margin-bottom: 2rem; }
.top .badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(120deg, var(--accent-1), var(--accent-2));
  color: #fff; font-size: 12px; font-weight: 500;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 18px; letter-spacing: 0.02em;
}
.top .badge i { font-size: 14px; }
.top h1 { font-size: 28px; font-weight: 500; margin: 0 0 10px; letter-spacing: -0.01em; }
.top p { font-size: 14.5px; color: var(--ink-soft); max-width: 460px; margin: 0 auto; line-height: 1.6; }

/* Steps */
.step { display: none; }
.step.active { display: block; animation: rise 0.25s ease; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.card {
  background: var(--surface);
  border: 0.5px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 20px 50px -22px rgba(22, 35, 58, 0.18);
  overflow: hidden;
}

.item { padding: 1.75rem 2rem; }

.item-head { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.item-head .num {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent-tint); color: var(--accent-text);
  font-size: 12px; font-weight: 500;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.item-head .num i { font-size: 13px; }
.item-head h2 { font-size: 16px; font-weight: 500; margin: 0; }

.item .sub { font-size: 13px; color: var(--ink-soft); line-height: 1.6; margin: 0 0 14px; padding-left: 38px; }

.field-wrap { padding-left: 38px; }
label { font-size: 12.5px; color: var(--ink-soft); display: block; margin-bottom: 6px; font-weight: 500; }
input[type="text"], input[type="number"] {
  width: 100%; max-width: 340px; height: 42px; padding: 0 14px;
  border: 0.5px solid var(--line-strong); border-radius: var(--radius);
  font-size: 14px; background: #fff; color: var(--ink);
}
input.narrow { max-width: 140px; }
input[type="text"]:focus, input[type="number"]:focus {
  outline: none; box-shadow: 0 0 0 3px rgba(43, 76, 140, 0.14); border-color: var(--accent-1);
}
.err { font-size: 12px; color: var(--danger); min-height: 16px; margin: 6px 0 0; }
.err[hidden] { display: none; }

.callout {
  display: flex; gap: 10px; align-items: flex-start;
  background: var(--accent-tint); border-radius: var(--radius);
  padding: 12px 14px; margin: 0 0 16px;
}
.callout i { color: var(--accent-text); font-size: 17px; margin-top: 1px; flex-shrink: 0; }
.callout p { font-size: 12.5px; color: var(--accent-text); margin: 0; line-height: 1.6; }
.callout strong { font-weight: 500; }

/* Buttons */
button {
  height: 42px; border-radius: var(--radius); font-size: 14px;
  font-weight: 500; cursor: pointer; border: 0.5px solid var(--line-strong);
  background: #fff; color: var(--ink); transition: all 0.15s ease; padding: 0 18px;
  touch-action: manipulation;
}
button:hover { background: var(--canvas); }
button:active { transform: scale(0.98); }
button i { vertical-align: -2px; margin-right: 6px; font-size: 15px; }
button.primary {
  background: linear-gradient(120deg, var(--accent-1), var(--accent-2));
  color: #fff; border: none; width: 100%; max-width: 340px;
}
button.primary:hover { filter: brightness(1.06); background: linear-gradient(120deg, var(--accent-1), var(--accent-2)); }
button.primary:disabled { filter: grayscale(0.4); opacity: 0.55; cursor: not-allowed; }
button.primary.big { height: 50px; font-size: 15px; }
button.ghost { display: block; width: 100%; max-width: 340px; }

.status-row {
  display: none; align-items: center; gap: 8px; margin-top: 12px;
  font-size: 13px; color: var(--success);
}
.status-row.show { display: flex; }
.status-row i { font-size: 16px; }

/* Map screen */
#map { width: 100%; height: 44dvh; border-radius: 18px; overflow: hidden; z-index: 0; }
.map-card { margin-top: -16px; position: relative; z-index: 1; }

.toggle-row { display: flex; gap: 8px; margin-bottom: 14px; }
.seg-btn { flex: 1; height: 38px; font-size: 13px; padding: 0; }
.seg-btn i { font-size: 15px; }
.seg-btn.active {
  background: var(--accent-tint); border-color: var(--accent-1);
  color: var(--accent-text); font-weight: 500;
}
.seg-btn.active:hover { background: var(--accent-tint); }

.quality { font-size: 15px; font-weight: 500; margin: 0 0 4px; text-align: center; }
.quality.excellent { color: var(--success); }
.quality.good { color: var(--success); }
.quality.fair { color: var(--warn); }
.quality.poor { color: var(--danger); }
.coords { font-size: 13px; color: var(--ink-soft); margin: 0 0 10px; text-align: center; }
#map-warning {
  text-align: center; border: 0.5px solid rgba(201, 75, 75, 0.35);
  background: rgba(201, 75, 75, 0.06); border-radius: var(--radius); padding: 8px 12px;
}
#map-warning[hidden] { display: none; }

.confirm-row { display: flex; gap: 10px; margin-top: 12px; }
.confirm-row .primary { flex: 2; }
.confirm-row .ghost { flex: 1; }

/* Success summary */
.summary {
  background: var(--success-tint);
  border: 0.5px solid rgba(31, 158, 111, 0.35);
  border-radius: 18px;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 20px 50px -22px rgba(22, 35, 58, 0.18);
}
.summary .summary-icon { font-size: 38px; color: var(--success); margin-bottom: 10px; }
.summary h2 { font-size: 18px; font-weight: 500; margin: 0 0 6px; color: var(--ink); }
.summary > p { font-size: 13px; color: var(--ink-soft); margin: 0 0 16px; line-height: 1.6; }
.summary .row {
  display: flex; justify-content: space-between; text-align: left;
  font-size: 13px; padding: 8px 2px; border-top: 0.5px solid rgba(31, 158, 111, 0.25);
}
.summary .row span:first-child { color: var(--ink-soft); }
.summary .row .ok { color: var(--success); font-weight: 500; }
.summary .close { font-size: 12px; color: var(--ink-muted); margin: 16px 0 0; }

@media (max-width: 480px) {
  .item { padding: 1.5rem; }
  .sub, .field-wrap { padding-left: 0; }
  .top h1 { font-size: 24px; }
  #map { height: 40dvh; }
}