:root {
  --navy-950: #06131c;
  --navy-900: #071a26;
  --navy-800: #0c2735;
  --ink: #102a36;
  --muted: #627680;
  --line: #d9e2e5;
  --paper: #f5f7f6;
  --white: #fff;
  --teal: #10a7a2;
  --teal-dark: #087d7a;
  --lime: #b8d943;
  --orange: #f39b43;
  --red: #d95d52;
  --blue: #3889c9;
  --shadow: 0 18px 50px rgba(8, 35, 46, .1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(12, 39, 53, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(12, 39, 53, .035) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
}

button, input, select { font: inherit; }
button, select { cursor: pointer; }

.topbar {
  height: 76px;
  padding: 0 max(24px, calc((100vw - 1480px) / 2));
  color: var(--white);
  background: var(--navy-950);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.brand {
  color: inherit;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--teal);
  display: grid;
  place-items: center;
}

.brand-mark svg { width: 26px; fill: none; stroke: white; stroke-width: 2.2; stroke-linecap: round; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 19px; letter-spacing: -.02em; }
.brand small { color: #91a8b3; font-size: 11px; margin-top: 1px; letter-spacing: .06em; text-transform: uppercase; }

.ghost-button, .text-button {
  border: 0;
  background: none;
  color: inherit;
}

.ghost-button {
  padding: 9px 14px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 8px;
  font-size: 13px;
}

.ghost-button:hover { background: rgba(255,255,255,.08); }

.page-shell { max-width: 1480px; margin: auto; padding: 36px 24px 60px; }

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  align-items: end;
  gap: 40px;
  margin-bottom: 30px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.intro h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(32px, 4vw, 54px);
  line-height: 1.02;
  letter-spacing: -.045em;
}

.intro > div > p:last-child {
  max-width: 780px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
}

.safety-note {
  border-left: 3px solid var(--lime);
  background: var(--white);
  box-shadow: var(--shadow);
  padding: 18px 20px;
}

.safety-note strong, .safety-note span { display: block; }
.safety-note strong { font-size: 14px; margin-bottom: 5px; }
.safety-note span { color: var(--muted); font-size: 13px; line-height: 1.5; }

.setup-card, .field-guide, .readings-panel, .analysis-panel {
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.setup-card { padding: 24px; margin-bottom: 20px; }
.field-guide { padding: 24px; margin-bottom: 20px; }

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 22px;
}

.section-heading > div:first-child { display: flex; gap: 13px; }
.section-heading h2 { margin: 0 0 3px; font-size: 18px; letter-spacing: -.02em; }
.section-heading p { margin: 0; color: var(--muted); font-size: 12px; }

.step-number {
  color: var(--teal-dark);
  font: 800 12px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  padding-top: 4px;
}

.live-pill {
  color: var(--teal-dark);
  background: #e6f7f4;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 11px;
  font-weight: 700;
}

.live-pill i {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 5px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(16,167,162,.13);
}

.setup-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }

.field span {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
}

select, .setup-input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0 34px 0 11px;
  color: var(--ink);
  background: var(--white);
}

select:focus, input:focus, textarea:focus { outline: 3px solid rgba(16,167,162,.13); border-color: var(--teal); }

.setup-input { padding-right: 11px; cursor: text; }

.guide-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.guide-grid details, .measurement-guide {
  border: 1px solid var(--line);
  background: #f9fbfa;
}

.guide-grid details { padding: 14px; }
.guide-grid summary, .measurement-guide summary { cursor: pointer; color: var(--ink); font-size: 12px; font-weight: 800; line-height: 1.35; }
.guide-grid p, .measurement-guide p { margin: 10px 0 0; color: var(--muted); font-size: 11px; line-height: 1.55; }

.workspace { display: grid; grid-template-columns: minmax(680px, 1.45fr) minmax(380px, .8fr); gap: 20px; align-items: start; }
.readings-panel { padding: 24px; }
.analysis-panel { background: var(--navy-900); color: var(--white); border-color: var(--navy-900); }
.analysis-sticky { position: sticky; top: 16px; padding: 24px; }
.analysis-panel .section-heading p { color: #8fa6b1; }

.text-button {
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 750;
  padding: 4px;
}

.reading-group { border-top: 1px solid var(--line); padding: 18px 0 21px; }
.reading-group:last-child { padding-bottom: 0; }
.group-title { display: flex; align-items: baseline; gap: 8px; margin-bottom: 13px; }
.group-title span { font-size: 13px; font-weight: 800; }
.group-title small { color: var(--muted); font-size: 11px; }
.reading-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }

.reading {
  min-width: 0;
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfc;
  transition: border-color .15s, background .15s, box-shadow .15s;
}

.reading-label {
  display: block;
  min-height: 30px;
  font-size: 11px;
  font-weight: 750;
  line-height: 1.25;
}

.input-wrap { display: flex; align-items: baseline; border-bottom: 2px solid #cfdadc; }
.input-wrap input {
  width: 100%;
  min-width: 0;
  height: 38px;
  padding: 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  font-size: 23px;
  font-weight: 720;
}
.input-wrap input:focus { outline: 0; }
.input-wrap b { color: var(--muted); font-size: 11px; font-weight: 700; }
.reading-help { display: block; min-height: 26px; margin-top: 8px; color: var(--muted); font-size: 9.5px; line-height: 1.35; }

.tech-tip {
  display: none;
  margin-top: 8px;
  color: #275654;
  font-size: 11px;
  background: #e9f7f5;
  border-left: 3px solid var(--teal);
  padding: 8px 10px;
  border-radius: 6px;
}
.reading.show-tech .tech-tip { display: block; }

.reading::after {
  content: "";
  display: block;
  height: 15px;
  margin-top: 6px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  line-height: 15px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.reading.status-low { border-color: rgba(56,137,201,.45); background: #f3f9fd; }
.reading.status-low::after { content: "Low"; color: var(--blue); }
.reading.status-ok { border-color: rgba(16,167,162,.45); background: #f1fbf9; }
.reading.status-ok::after { content: "In range"; color: var(--teal-dark); }
.reading.status-high { border-color: rgba(217,93,82,.45); background: #fff7f5; }
.reading.status-high::after { content: "High"; color: var(--red); }
.reading.status-info::after { content: "Calculated"; color: var(--blue); }
.reading.inferred { border-style: dashed; box-shadow: inset 3px 0 0 var(--blue); }
.reading.inferred input { color: var(--blue); }
.reading.inferred::after { content: "Inferred"; color: var(--blue); }
.reading.invalid { border-color: var(--red); }
.reading.invalid::after { content: "Check values"; color: var(--red); }
.key-reading { background: #f7faf9; }

.measurement-guide {
  margin-top: 10px;
  padding: 11px 13px;
  border-left: 3px solid var(--teal);
}

.notes-field {
  display: block;
  margin-top: 14px;
}

.notes-field > span {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.notes-field textarea {
  width: 100%;
  resize: vertical;
  min-height: 88px;
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: #fbfcfc;
  font: inherit;
  font-size: 12px;
  line-height: 1.5;
}

.results-heading { padding-bottom: 20px; margin-bottom: 0; border-bottom: 1px solid rgba(255,255,255,.1); }

.export-button {
  flex: 0 0 auto;
  padding: 8px 10px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 7px;
  color: var(--white);
  background: rgba(255,255,255,.07);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.export-button:hover:not(:disabled) { color: var(--navy-950); background: var(--lime); border-color: var(--lime); }
.export-button:disabled { opacity: .38; cursor: not-allowed; }

.empty-result { text-align: center; padding: 42px 20px; color: #92a8b3; }
.empty-result strong { display: block; color: var(--white); font-size: 14px; }
.empty-result p { margin: 7px auto 0; max-width: 280px; font-size: 12px; line-height: 1.5; }
.empty-icon {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin: 0 auto 12px;
  border: 1px dashed #53717f;
  border-radius: 50%;
  font-size: 22px;
}

.summary-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; padding: 16px 0; }
.summary-item { padding: 12px; background: rgba(255,255,255,.055); border-left: 3px solid #56707c; }
.summary-item.low { border-color: var(--blue); }
.summary-item.ok { border-color: var(--teal); }
.summary-item.high { border-color: var(--red); }
.summary-item.info { border-color: #9caeb6; }
.summary-item span, .summary-item strong, .summary-item small { display: block; }
.summary-item span { color: #91a8b3; font-size: 9px; font-weight: 750; letter-spacing: .05em; text-transform: uppercase; }
.summary-item strong { margin: 4px 0 2px; font-size: 20px; }
.summary-item small { color: #b2c0c7; font-size: 10px; }

.result-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 5px 0 10px;
}
.result-title span { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .07em; }
.result-title small { color: #7f98a4; font-size: 9px; }

.diagnosis-card {
  margin-bottom: 8px;
  padding: 14px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.08);
}
.diagnosis-top { display: flex; justify-content: space-between; gap: 12px; }
.diagnosis-top strong { font-size: 13px; }
.confidence { color: var(--lime); font: 800 10px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; white-space: nowrap; }
.diagnosis-card p { margin: 7px 0 0; color: #a9bac2; font-size: 11px; line-height: 1.45; }
.evidence { margin-top: 8px; color: #d1dbe0; font-size: 10px; }

.quality-section { margin: 3px 0 18px; }
.quality-section ul { margin: 0; padding: 0; list-style: none; }
.quality-section li {
  position: relative;
  margin-bottom: 6px;
  padding: 9px 10px 9px 28px;
  color: #f1c4bf;
  background: rgba(217,93,82,.12);
  border-left: 2px solid var(--red);
  font-size: 10px;
  line-height: 1.45;
}
.quality-section li::before {
  content: "!";
  position: absolute;
  left: 10px;
  color: #ff8c82;
  font-weight: 900;
}

.measurement-coach { margin: 3px 0 18px; }
.coach-card {
  padding: 15px;
  color: var(--ink);
  background: #f2fbf8;
  border: 1px solid rgba(16,167,162,.45);
  border-left: 4px solid var(--lime);
}
.coach-kicker {
  display: block;
  margin-bottom: 5px;
  color: var(--teal-dark);
  font: 800 9px/1.3 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: .07em;
  text-transform: uppercase;
}
.coach-card > strong { display: block; font-size: 15px; line-height: 1.3; }
.coach-card > p { margin: 7px 0 0; color: #4f6872; font-size: 11px; line-height: 1.5; }
.coach-instruction {
  margin-top: 12px;
  padding: 10px;
  background: var(--white);
  border: 1px solid #d8e9e5;
}
.coach-instruction span {
  display: block;
  margin-bottom: 4px;
  color: var(--teal-dark);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.coach-instruction p { margin: 0; color: #415b65; font-size: 10px; line-height: 1.5; }
.coach-result { font-weight: 700; }
.coach-button {
  width: 100%;
  margin-top: 12px;
  padding: 9px 11px;
  border: 0;
  border-radius: 6px;
  color: var(--white);
  background: var(--teal-dark);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.coach-button:hover { background: var(--navy-800); }
.reading.coach-target {
  border-color: var(--lime);
  box-shadow: 0 0 0 3px rgba(184,217,67,.22);
}

.next-checks { margin-top: 18px; }
.next-checks ol { margin: 0; padding: 0; list-style: none; counter-reset: checks; }
.next-checks li {
  position: relative;
  padding: 9px 8px 9px 31px;
  border-top: 1px solid rgba(255,255,255,.08);
  color: #c2cfd5;
  font-size: 11px;
  line-height: 1.45;
  counter-increment: checks;
}
.next-checks li::before {
  content: counter(checks, decimal-leading-zero);
  position: absolute;
  left: 3px;
  color: var(--teal);
  font: 800 9px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace;
}

.disclaimer {
  margin-top: 20px;
  padding: 12px;
  color: #8199a4;
  background: rgba(0,0,0,.15);
  font-size: 9px;
  line-height: 1.5;
}
.disclaimer strong { color: #aabac1; }

@media (max-width: 1120px) {
  .workspace { grid-template-columns: 1fr; }
  .analysis-sticky { position: static; }
  .intro { grid-template-columns: 1fr; }
  .safety-note { max-width: 640px; }
  .guide-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .topbar { height: 66px; padding: 0 16px; }
  .brand small { display: none; }
  .page-shell { padding: 24px 12px 40px; }
  .intro { gap: 20px; margin-bottom: 20px; }
  .intro h1 { font-size: 34px; }
  .setup-card, .field-guide, .readings-panel, .analysis-sticky { padding: 17px; }
  .setup-grid, .reading-grid { grid-template-columns: repeat(2, 1fr); }
  .workspace { display: block; }
  .analysis-panel { margin-top: 14px; }
}

@media (max-width: 420px) {
  .setup-grid { grid-template-columns: 1fr; }
  .guide-grid { grid-template-columns: 1fr; }
  .reading-grid { gap: 7px; }
  .reading { padding: 9px; }
  .reading-label { min-height: 38px; }
  .input-wrap input { font-size: 20px; }
  .section-heading { margin-bottom: 17px; }
  .results-heading { align-items: flex-start; }
}