:root {
  --accent: #1a73e8;
  --accent-dark: #1558b0;
  --ink: #1f2430;
  --ink-soft: #5f6673;
  --line: #d6dae2;
  --bg: #fafbfd;
  --card: #ffffff;
  --danger: #c5221f;
  --radius: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--bg);
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 2.5rem 1rem 3rem;
}

.masthead { text-align: center; margin-bottom: 1.75rem; }
.masthead h1 { font-size: 2rem; font-weight: 650; margin: 0 0 .35rem; }
.tagline { color: var(--ink-soft); margin: 0; }

/* ---- form ---- */

#serp-form {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(31, 36, 48, 0.06);
}

.row {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: .75rem;
}
.row:last-child { margin-bottom: 0; }

/* advanced rows hidden until toggled */
.adv { display: none; }
#serp-form.advanced-open .adv { display: flex; }

.field { position: relative; }
.field.grow { flex: 1 1 auto; }
.field.small { flex: 1 1 0; min-width: 0; }

.field input {
  width: 100%;
  padding: .55rem .75rem;
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  outline: none;
  transition: border-color .12s, box-shadow .12s;
}
.field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.18);
}
.field input.invalid { border-color: var(--danger); }
.field input::placeholder { color: #9aa1ad; }

.mini-label {
  font-size: .8rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

.btn {
  font: inherit;
  padding: .55rem 1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color .12s, color .12s, border-color .12s;
}
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-dark); }
.btn.outline { background: #fff; color: var(--accent); border-color: var(--accent); }
.btn.outline:hover { background: var(--accent); color: #fff; }
.btn.ghost { background: #fff; color: var(--ink-soft); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--ink-soft); color: var(--ink); }
.btn.subtle {
  background: none;
  color: var(--ink-soft);
  border: none;
  padding: .15rem .25rem;
  font-size: .85rem;
}
.btn.subtle:hover { color: var(--accent); text-decoration: underline; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn:disabled { opacity: .6; cursor: default; }

.error {
  color: var(--danger);
  font-size: .85rem;
  margin: -.35rem 0 .75rem;
}

/* ---- quick-location chips ---- */

.chips { flex-wrap: wrap; gap: .4rem; }
.chip {
  font: inherit;
  font-size: .85rem;
  padding: .3rem .7rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  cursor: pointer;
  transition: border-color .12s, color .12s;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.active { border-color: var(--accent); color: var(--accent); background: rgba(26, 115, 232, 0.08); }

/* ---- typeahead menu ---- */

.ta-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 50;
  margin: 0;
  padding: .25rem 0;
  list-style: none;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 6px 20px rgba(31, 36, 48, 0.12);
  max-height: 320px;
  overflow-y: auto;
}
.ta-item {
  padding: .45rem .75rem;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ta-item.hi, .ta-item:hover { background: rgba(26, 115, 232, 0.1); }
.ta-item .ta-sub { color: var(--ink-soft); font-size: .85rem; }

/* ---- map ---- */

#map {
  width: 100%;
  height: 320px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

/* ---- help + footer ---- */

.help { margin-top: 2rem; }
.help h2 { font-size: 1.15rem; margin: 1.5rem 0 .5rem; }
.help code {
  background: #eef1f5;
  border-radius: 4px;
  padding: .1rem .35rem;
  font-size: .9em;
}
.help li { margin-bottom: .3rem; }

.foot {
  margin-top: 2.5rem;
  color: var(--ink-soft);
  font-size: .85rem;
  text-align: center;
}

@media (max-width: 560px) {
  .row { flex-wrap: wrap; }
  .field.grow { flex-basis: 100%; }
}