/* Author: William Leonard, Saxon Enterprises, Inc., wfleonard@saxonenterprises.net
   Layout: clinical instrument page. Clean cool paper, one dark "monitor" panel,
   a pulse red accent used only for actions and the heartbeat line. */
:root {
  --bg: #f5f7f8;
  --surface: #ffffff;
  --ink: #0f1d28;
  --muted: #566775;
  --line: #d9e1e6;
  --pulse: #d33a3f;
  --pulse-ink: #ffffff;
  --seo: #2c5bc9;
  --aeo: #0f8a83;
  --warn: #b7791f;
  --crit: #c53030;
  --monitor: #0e1a22;
  --monitor-line: #22323d;
  --monitor-ink: #d7e4ea;
  --monitor-dim: #7f97a5;
  --trace: #ff5a5f;
  --band: #eaf0f3;

  --f-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-body: "Public Sans", "Segoe UI", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --s-1: clamp(2.2rem, 1.4rem + 3.6vw, 3.9rem);
  --s-2: clamp(1.6rem, 1.2rem + 1.8vw, 2.4rem);
  --s-3: 1.2rem;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b141a; --surface: #111d25; --ink: #e6eef2; --muted: #93a6b2; --line: #22333e;
    --pulse: #ef5358; --pulse-ink: #160607; --seo: #6f93ec; --aeo: #33b7ae; --warn: #e0a64a; --crit: #f07070;
    --monitor: #070e13; --monitor-line: #1c2a33; --band: #0f1a21;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b141a; --surface: #111d25; --ink: #e6eef2; --muted: #93a6b2; --line: #22333e;
  --pulse: #ef5358; --pulse-ink: #160607; --seo: #6f93ec; --aeo: #33b7ae; --warn: #e0a64a; --crit: #f07070;
  --monitor: #070e13; --monitor-line: #1c2a33; --band: #0f1a21;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1rem/1.6 var(--f-body);
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: ""; position: fixed; inset: 0 0 auto;
  height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--bg);
}
img { max-width: 100%; }
[hidden] { display: none !important; }

.wrap {
  max-width: 1160px;
  margin-inline: auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.mono { font-family: var(--f-mono); font-variant-numeric: tabular-nums; }

h1, h2, h3 { font-family: var(--f-display); line-height: 1.08; margin: 0; text-wrap: balance; letter-spacing: -0.015em; }
h1 { font-size: var(--s-1); font-weight: 800; }
h1 em { font-style: normal; color: var(--pulse); }
h2 { font-size: var(--s-2); font-weight: 700; }
h3 { font-size: var(--s-3); font-weight: 700; }
p { margin: 0; }
.eyebrow {
  font: 600 0.75rem/1 var(--f-mono);
  text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--pulse); margin-bottom: 0.9rem;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.85rem 1.35rem; border-radius: 999px;
  background: var(--pulse); color: var(--pulse-ink);
  font: 600 1rem/1 var(--f-body); text-decoration: none;
  border: 2px solid var(--pulse); cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px -8px var(--pulse); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); box-shadow: none; }
.btn-small { padding: 0.55rem 1rem; font-size: 0.875rem; }
.btn-block { width: 100%; }
:focus-visible { outline: 3px solid var(--seo); outline-offset: 2px; }

/* Top bar */
.bar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.bar-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 0.75rem; }
.brand { display: flex; align-items: center; gap: 0.55rem; color: var(--ink); text-decoration: none; font: 800 1.15rem/1 var(--f-display); }
.brand-mark { width: 30px; height: 20px; fill: none; stroke: var(--pulse); stroke-width: 2.4; stroke-linejoin: round; stroke-linecap: round; }

/* Hero */
.hero { padding-block: clamp(2.5rem, 6vw, 5rem); }
.hero-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(2rem, 4vw, 4rem); align-items: center; }
.hero-copy { display: grid; gap: 1.4rem; min-width: 0; }
.lede { font-size: 1.125rem; color: var(--muted); max-width: 58ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.monitor {
  margin: 0; background: var(--monitor); color: var(--monitor-ink);
  border-radius: 16px; padding: 1.1rem; display: grid; gap: 0.9rem;
  box-shadow: 0 30px 60px -30px rgba(15, 29, 40, 0.55);
  min-width: 0;
}
.monitor-head { display: flex; justify-content: space-between; font-size: 0.72rem; letter-spacing: 0.1em; color: var(--monitor-dim); }
.live { display: inline-flex; align-items: center; gap: 0.4rem; }
.live i { width: 7px; height: 7px; border-radius: 50%; background: var(--trace); animation: blink 1.2s infinite; }
@keyframes blink { 50% { opacity: 0.25; } }
#ecg { width: 100%; height: 140px; display: block; border-block: 1px solid var(--monitor-line); }
.vitals { display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem 1rem; margin: 0; }
.vitals dt { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--monitor-dim); }
.vitals dd { margin: 0.15rem 0 0; font-size: 1.35rem; font-weight: 600; }
.vitals small { font-size: 0.72rem; font-weight: 400; color: var(--monitor-dim); margin-left: 0.25rem; }
.vitals .warn { color: #f0b54d; }
.vitals .crit { color: var(--trace); }
.monitor figcaption { font-size: 0.75rem; color: var(--monitor-dim); }

/* Shift */
.shift { background: var(--band); padding-block: clamp(3rem, 6vw, 5rem); border-block: 1px solid var(--line); }
.shift-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: clamp(2rem, 4vw, 4rem); }
.shift-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.shift-cols article { display: grid; gap: 0.5rem; align-content: start; border-top: 3px solid var(--seo); padding-top: 1rem; }
.shift-cols article:nth-child(2) { border-color: var(--aeo); }
.tag { font-size: 0.75rem; color: var(--muted); letter-spacing: 0.04em; }
.shift-cols p:last-child { color: var(--muted); }

/* Sections */
.returns, .checks, .process { padding-block: clamp(3.5rem, 7vw, 6rem); }
.section-head { display: grid; gap: 0.6rem; margin-bottom: 2.2rem; max-width: 62ch; }
.section-head p:not(.eyebrow) { color: var(--muted); }

/* Calculator */
.calc {
  display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.4fr);
  background: var(--surface); border: 1px solid var(--line); border-radius: 18px; overflow: hidden;
}
.calc-inputs { padding: clamp(1.25rem, 3vw, 2rem); display: grid; gap: 1.4rem; align-content: start; border-right: 1px solid var(--line); }
.field { display: grid; gap: 0.45rem; border: 0; padding: 0; margin: 0; min-width: 0; }
.field label, .field legend { font-weight: 600; font-size: 0.92rem; padding: 0; }
.range-row { display: grid; grid-template-columns: 1fr 5.5rem; gap: 0.8rem; align-items: center; }
.range-row output { text-align: right; font-weight: 600; }
input[type="range"] { width: 100%; accent-color: var(--pulse); }

.seg { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); border-radius: 999px; padding: 3px; margin-top: 0.3rem; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label { text-align: center; padding: 0.5rem 0.25rem; border-radius: 999px; cursor: pointer; font-size: 0.85rem; font-weight: 500; color: var(--muted); }
.seg input:checked + label { background: var(--ink); color: var(--bg); }
.seg input:focus-visible + label { outline: 3px solid var(--seo); outline-offset: 1px; }
.hint { font-size: 0.82rem; color: var(--muted); margin-top: 0.3rem; }

.calc-results { padding: clamp(1.25rem, 3vw, 2rem); display: grid; gap: 1.5rem; align-content: start; min-width: 0; }
.headline-num { display: grid; gap: 0.2rem; }
.headline-num .label { font-size: 0.85rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.headline-num strong { font-size: clamp(2.4rem, 1.6rem + 3vw, 3.6rem); line-height: 1; color: var(--ink); letter-spacing: -0.03em; }
.roi { font-size: 0.9rem; color: var(--aeo); font-weight: 600; }
.roi.neg { color: var(--warn); }
.kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: 0; border-block: 1px solid var(--line); padding-block: 1rem; }
.kpis dt { font-size: 0.8rem; color: var(--muted); line-height: 1.35; }
.kpis dd { margin: 0.35rem 0 0; font-size: 1.5rem; font-weight: 600; }

.chart-wrap { display: grid; gap: 0.6rem; min-width: 0; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem; font-size: 0.8rem; color: var(--muted); }
.sw { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 0.35rem; vertical-align: -1px; }
.sw-seo { background: var(--seo); }
.sw-aeo { background: var(--aeo); }
.sw-cost { height: 0; border-top: 2px dashed var(--ink); border-radius: 0; vertical-align: 3px; width: 14px; }
.chart-scroll { overflow-x: auto; }
#chart { width: 100%; min-width: 460px; height: auto; display: block; }
#chart .grid { stroke: var(--line); stroke-width: 1; }
#chart .tick { fill: var(--muted); font: 11px var(--f-mono); }
#chart .seo { fill: var(--seo); }
#chart .aeo { fill: var(--aeo); }
#chart .cost { stroke: var(--ink); stroke-width: 1.5; stroke-dasharray: 5 4; fill: none; }
#chart .bar-g rect { transition: y .3s ease, height .3s ease; }
@media (prefers-reduced-motion: reduce) { #chart .bar-g rect { transition: none; } .live i { animation: none; } }

.fine { font-size: 0.82rem; color: var(--muted); margin-top: 1rem; max-width: 90ch; }

/* Checks */
.check-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem 2.5rem; }
.check-list li { display: grid; grid-template-columns: auto 1fr; gap: 0.9rem; align-items: start; }
.check-list .code {
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.06em;
  border: 1px solid var(--line); border-radius: 6px; padding: 0.35rem 0.45rem; color: var(--pulse);
  background: var(--surface);
}
.check-list div { display: grid; gap: 0.35rem; min-width: 0; }
.check-list p { color: var(--muted); font-size: 0.95rem; }

/* Process */
.process { background: var(--band); border-block: 1px solid var(--line); }
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; counter-reset: s; }
.steps li { counter-increment: s; display: grid; gap: 0.5rem; padding-top: 1rem; border-top: 1px solid var(--ink); position: relative; }
.steps li::before { content: "0" counter(s); font: 600 0.8rem/1 var(--f-mono); color: var(--pulse); }
.steps p { color: var(--muted); }

/* CTA */
.cta { padding-block: clamp(3.5rem, 7vw, 6rem); }
.cta-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(2rem, 4vw, 4rem); align-items: start; }
.cta-grid > div { display: grid; gap: 1rem; }
.cta-grid > div p:not(.eyebrow) { color: var(--muted); max-width: 52ch; }
.cta-grid a { color: var(--pulse); text-underline-offset: 2px; }
.contact { font-size: 0.92rem; display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.sel { user-select: all; color: var(--ink); overflow-wrap: anywhere; }
.copy { font: 600 0.78rem/1 var(--f-body); padding: 0.4rem 0.7rem; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; }
.scan-form { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: clamp(1.25rem, 3vw, 2rem); display: grid; gap: 1.1rem; }
.scan-form input {
  font: inherit; padding: 0.75rem 0.85rem; border-radius: 8px;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink); width: 100%;
}
.scan-form input[aria-invalid="true"] { border-color: var(--crit); }
.form-msg { font-size: 0.9rem; min-height: 1.4em; }
.form-msg.ok { color: var(--aeo); }
.form-msg.err { color: var(--crit); }

/* Footer */
.foot { border-top: 1px solid var(--line); }
.foot-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem; padding-block: 1.5rem; font-size: 0.85rem; color: var(--muted); }

/* Responsive */
@media (max-width: 920px) {
  .hero-grid, .shift-grid, .cta-grid { grid-template-columns: 1fr; }
  .calc { grid-template-columns: 1fr; }
  .calc-inputs { border-right: 0; border-bottom: 1px solid var(--line); }
  .check-list { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .shift-cols, .check-list, .steps { grid-template-columns: 1fr; }
  .kpis { grid-template-columns: 1fr; }
  .kpis div { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }
  .kpis dd { margin: 0; font-size: 1.2rem; }
}