:root {
  --bg: #e9f0ee;
  --surface: #f9fbfa;
  --ink: #12282e;
  --muted: #53686d;
  --line: #c6d4d1;

  --low: #2e7d5b;
  --medium: #c9971a;
  --high: #d4521c;
  --critical: #9c1238;

  --display: "Bricolage Grotesque", "Trebuchet MS", sans-serif;
  --body: "Public Sans", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.55;
}

.page { max-width: 46rem; margin: 0 auto; padding: 2.5rem 1.25rem 3rem; }

.masthead h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2.4rem, 8vw, 3.6rem);
  letter-spacing: -0.02em;
  line-height: 1;
}
.masthead p { margin: 0.4rem 0 0; color: var(--muted); }

/* Search */
.search { margin-top: 2rem; }
.search label { display: block; font-weight: 600; margin-bottom: 0.35rem; }
.search-row { display: flex; gap: 0.5rem; }
.search input {
  flex: 1; min-width: 0;
  padding: 0.8rem 1rem;
  font: inherit; font-size: 1.1rem;
  color: var(--ink); background: var(--surface);
  border: 2px solid var(--line); border-radius: 6px;
}
.search button {
  padding: 0 1.4rem;
  font: inherit; font-weight: 600;
  color: #fff; background: var(--ink);
  border: 0; border-radius: 6px; cursor: pointer;
}
.search button:disabled { opacity: 0.6; cursor: progress; }
:focus-visible { outline: 3px solid #1b6f8a; outline-offset: 2px; }

.message { margin: 1rem 0 0; padding: 0.75rem 1rem; border-left: 4px solid var(--high); background: var(--surface); }

/* Result */
.result { margin-top: 2rem; }

.overall {
  display: flex; justify-content: space-between; align-items: flex-end; gap: 1rem;
  padding: 1.5rem; border-radius: 8px;
  color: #fff; background: var(--level, var(--ink));
}
.overall .where { margin: 0; font-size: 1.1rem; font-weight: 500; }
.overall .overall-label { margin: 0; opacity: 0.85; }
.overall-level {
  margin: 0;
  font-family: var(--display); font-weight: 800;
  font-size: clamp(2.2rem, 9vw, 4rem); line-height: 1; letter-spacing: -0.01em;
}

[data-level="LOW"] { --level: var(--low); }
[data-level="MEDIUM"] { --level: var(--medium); }
[data-level="HIGH"] { --level: var(--high); }
[data-level="CRITICAL"] { --level: var(--critical); }

.meters { display: grid; gap: 1rem; margin-top: 1rem; }
.meter { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 1rem 1.25rem 1.25rem; }
.meter-head { display: flex; justify-content: space-between; align-items: baseline; }
.meter h2 { margin: 0; font-size: 1.05rem; font-family: var(--display); }
.meter-head p { margin: 0; color: var(--muted); }
.meter-head strong { color: var(--level); }

/* The four-band scale is the signature element */
.scale {
  position: relative; height: 14px; margin-top: 0.9rem; border-radius: 7px;
  background: linear-gradient(to right,
    var(--low) 0 25%, var(--medium) 25% 50%, var(--high) 50% 75%, var(--critical) 75% 100%);
}
.scale i {
  position: absolute; top: -6px; width: 6px; height: 26px; margin-left: -3px;
  background: var(--ink); border: 2px solid var(--surface); border-radius: 3px;
  left: 0; transition: left 0.6s cubic-bezier(.2,.8,.2,1);
}

.readings {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 0; margin: 1rem 0 0;
  border: 1px solid var(--line); border-radius: 8px; background: var(--surface);
}
.readings div { padding: 0.9rem 1.1rem; border-right: 1px solid var(--line); }
.readings div:last-child { border-right: 0; }
.readings dt { color: var(--muted); font-size: 0.85rem; }
.readings dd { margin: 0.1rem 0 0; font-family: var(--display); font-weight: 600; font-size: 1.5rem; }

.advice { margin-top: 1rem; padding: 1.25rem; background: var(--surface); border: 1px solid var(--line); border-left: 6px solid var(--level, var(--ink)); border-radius: 8px; }
.advice h2 { margin: 0 0 0.5rem; font-family: var(--display); font-size: 1.25rem; }
.advice ul { margin: 0; padding-left: 1.2rem; }
.advice li + li { margin-top: 0.4rem; }

/* History */
.history { margin-top: 2rem; }
.history h2 { font-family: var(--display); font-size: 1.05rem; margin: 0 0 0.5rem; }
.history ul { list-style: none; margin: 0; padding: 0; }
.history li { display: flex; justify-content: space-between; gap: 1rem; padding: 0.55rem 0; border-top: 1px solid var(--line); }
.history button { background: none; border: 0; font: inherit; font-weight: 600; color: var(--ink); text-decoration: underline; cursor: pointer; padding: 0; }
.history .tag { font-weight: 600; color: var(--level); }
.history .when { color: var(--muted); font-size: 0.85rem; }

.foot { margin-top: 2.5rem; color: var(--muted); font-size: 0.85rem; }

@media (max-width: 30rem) {
  .readings div { border-right: 0; border-bottom: 1px solid var(--line); }
  .readings div:last-child { border-bottom: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .scale i { transition: none; }
}