/* ============================================================
   physiosim — bedside-monitor aesthetic
   Dark clinical theme by default; light chrome under prefers-color-scheme.
   No external fonts / CSS / JS. All self-contained.
   ============================================================ */

:root {
  /* Surfaces */
  --bg: #070b14;
  --bg-2: #0b1220;
  --panel: #0f1728;
  --panel-2: #121c30;
  --line: #1e2b45;
  --line-soft: #17233b;

  /* Text */
  --ink: #e8eef7;
  --ink-dim: #9fb0c7;
  --ink-faint: #6b7c96;

  /* Channel / accent colours (match render.js lane colours) */
  --ecg: #22e07a;     /* ECG — green */
  --abp: #ff5b5b;     /* ABP — red */
  --ppg-ir: #35d6f0;  /* PPG-IR — cyan */
  --ppg: #35d6f0;     /* PPG — cyan */
  --spo2: #58e0ff;    /* SpO2 pair — light cyan */
  --resp: #f2b23a;    /* respiration — amber */
  --accent: #4ea1ff;  /* UI accent — clinical blue */

  --ok: #35d07a;
  --bad: #ff6b6b;

  --radius: 12px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background:
    radial-gradient(1200px 600px at 70% -10%, rgba(78, 161, 255, 0.08), transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  width: min(1180px, 100% - 2.5rem);
  margin-inline: auto;
}

/* ---------------- Header ---------------- */
.site-header {
  border-bottom: 1px solid var(--line);
  padding: 1.6rem 0 1.3rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
}

.site-title {
  margin: 0;
  font-size: clamp(1.35rem, 1.1rem + 1.6vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5ch;
}
.site-title .brand {
  color: var(--ecg);
  font-family: var(--mono);
}
.site-title .tag {
  color: var(--ink);
  font-weight: 600;
}
.subtitle {
  margin: 0.45rem 0 0;
  color: var(--ink-dim);
  font-size: clamp(0.9rem, 0.85rem + 0.3vw, 1.02rem);
  max-width: 70ch;
}
.subtitle sub { font-size: 0.7em; }
.subtitle strong { color: var(--ink); }

/* Header actions: 3-step flow + methods button */
.header-actions {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem 1.2rem;
}
.flow {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  min-width: 0;
}
.flow li {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.55ch;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.32rem 0.85rem;
  font-size: 0.82rem;
  color: var(--ink-dim);
}
.flow li::before {
  counter-increment: step;
  content: counter(step);
  flex: none;
  display: grid;
  place-items: center;
  width: 1.35em;
  height: 1.35em;
  border-radius: 50%;
  background: rgba(78, 161, 255, 0.16);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.78em;
  font-weight: 700;
}
/* connector arrow sits in the inter-pill gap; hidden after the last step */
.flow li:not(:last-child)::after {
  content: "\2192";
  position: absolute;
  right: -1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-faint);
  font-size: 0.9rem;
}

/* ---------------- Main layout ---------------- */
main.wrap {
  padding: 1.4rem 0 3rem;
  display: grid;
  gap: 1.25rem;
  /* minmax(0,1fr) lets a wide child (e.g. the validation table) shrink instead
     of forcing the whole page to overflow horizontally on narrow viewports. */
  grid-template-columns: minmax(0, 1fr);
}
/* Belt-and-suspenders: no grid child may grow past the column's min-content. */
main.wrap > * { min-width: 0; }

/* ---------------- Monitor (hero) ---------------- */
.monitor-block {
  display: grid;
  grid-template-columns: 1fr minmax(180px, 220px);
  gap: 1rem;
  align-items: stretch;
}

.monitor {
  position: relative;
  background:
    linear-gradient(180deg, #05070d, #04060b);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255, 255, 255, 0.02);
  height: clamp(360px, 54vh, 640px);
  overflow: hidden;
}
#scope {
  display: block;
  width: 100%;
  height: 100%;
}

/* Right rail: big monitor digits */
.readouts {
  display: grid;
  grid-template-rows: repeat(4, 1fr);
  gap: 0.7rem;
}
.readout {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left-width: 4px;
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  column-gap: 0.5ch;
}
.readout__label {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
  text-transform: none;
}
.readout__label sub { font-size: 0.7em; }
.readout__value {
  grid-column: 1 / -1;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(2rem, 1.2rem + 3vw, 3.1rem);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.readout__unit {
  grid-column: 1 / -1;
  font-size: 0.74rem;
  color: var(--ink-faint);
  font-family: var(--mono);
}
.readout--hr   { border-left-color: var(--ecg);  }
.readout--hr   .readout__value { color: var(--ecg); }
.readout--spo2 { border-left-color: var(--spo2); }
.readout--spo2 .readout__value { color: var(--spo2); }
.readout--bp   { border-left-color: var(--abp);  }
.readout--bp   .readout__value { color: var(--abp); font-size: clamp(1.6rem, 1rem + 2.2vw, 2.4rem); }
.readout--rr   { border-left-color: var(--resp); }
.readout--rr   .readout__value { color: var(--resp); }

/* ---------------- Panels ---------------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem 1.3rem;
}
.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}
.panel h2 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}
.panel__sub {
  color: var(--ink-faint);
  font-weight: 500;
  font-size: 0.86rem;
}
.panel__lede {
  margin: 0 0 0.9rem;
  color: var(--ink-dim);
  font-size: 0.9rem;
  max-width: 90ch;
}
.panel__lede strong { color: var(--ink); }
.panel__lede code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: 5px;
  padding: 0.05em 0.4em;
  color: #cfe2ff;
}

/* ---------------- Controls ---------------- */
.preset-wrap {
  display: flex;
  align-items: center;
  gap: 0.55ch;
}
.preset-wrap label {
  font-size: 0.82rem;
  color: var(--ink-dim);
}
select#preset {
  appearance: none;
  background: var(--panel-2);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.45rem 2rem 0.45rem 0.7rem;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--ink-dim) 50%),
    linear-gradient(135deg, var(--ink-dim) 50%, transparent 50%);
  background-position: right 0.95rem center, right 0.65rem center;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}
select#preset:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.sliders {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.9rem 1.4rem;
}
.control label {
  display: block;
  font-size: 0.85rem;
  color: var(--ink);
  margin-bottom: 0.35rem;
}
.control label .unit {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.78rem;
  margin-left: 0.35ch;
}
.slider-row {
  display: flex;
  align-items: center;
  gap: 0.8ch;
}
.control__value {
  min-width: 3.4ch;
  text-align: right;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-size: 0.92rem;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: var(--line);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #dbe9ff;
  box-shadow: 0 0 0 4px rgba(78, 161, 255, 0.18);
}
input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #dbe9ff;
}
input[type="range"]:focus-visible { box-shadow: 0 0 0 3px rgba(78, 161, 255, 0.4); }

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.1rem;
}
.btn {
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 0.55rem 1.05rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.05s ease;
}
.btn:hover { border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn--primary { background: rgba(34, 224, 122, 0.12); border-color: rgba(34, 224, 122, 0.5); color: var(--ecg); }
.btn--accent  { background: rgba(78, 161, 255, 0.14); border-color: rgba(78, 161, 255, 0.55); color: #cfe2ff; }

/* Baroreflex-challenge live feedback (populated by web/src). Subtle by default. */
.baro-status {
  align-self: center;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink-dim);
}
.baro-status:empty { display: none; }

/* ---------------- Validation table ---------------- */
/* The nowrap table scrolls inside its own container instead of widening the
   page; min-width:0 lets this box shrink below the table's min-content. */
.table-scroll { overflow-x: auto; min-width: 0; }
#metrics {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
#metrics th, #metrics td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--line-soft);
  white-space: nowrap;
}
#metrics thead th {
  color: var(--ink-dim);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-bottom-color: var(--line);
}
#metrics tbody td {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}
#metrics tbody tr:hover { background: rgba(255, 255, 255, 0.02); }
#metrics td:first-child, #metrics th:first-child { font-family: var(--sans); }
/* status cells: validation.js may add .pass / .fail (or data-status) */
#metrics .pass, #metrics [data-status="pass"] { color: var(--ok); font-weight: 700; }
#metrics .fail, #metrics [data-status="fail"] { color: var(--bad); font-weight: 700; }

/* ---------------- About dialog (long-form methods) ---------------- */
.about-dialog {
  width: min(760px, 92vw);
  max-height: 86vh;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.about-dialog::backdrop {
  background: rgba(3, 6, 12, 0.62);
  backdrop-filter: blur(2px);
}
.about-dialog__bar {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.2rem;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.about-dialog__bar h2 { margin: 0; font-size: 1.05rem; }
.about-dialog__close { flex: none; }
.about-dialog__body {
  overflow-y: auto;
  max-height: calc(86vh - 3.5rem);
  padding: 0.2rem 1.2rem 1.3rem;
}

/* ---------------- About prose ---------------- */
.about-summary .panel__lede { margin-bottom: 0; }
#about { color: var(--ink-dim); font-size: 0.94rem; max-width: 92ch; }
#about p { margin: 0.7rem 0; }
#about h3 {
  color: var(--ink);
  font-size: 0.98rem;
  margin: 1.5rem 0 0.4rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--line-soft);
}
#about strong { color: var(--ink); }
#about ul { margin: 0.5rem 0; padding-left: 1.2rem; }
#about li { margin: 0.32rem 0; }
#about code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: 5px;
  padding: 0.05em 0.4em;
  color: #cfe2ff;
}
#about a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(78, 161, 255, 0.4); }
#about a:hover { border-bottom-color: var(--accent); }
.honesty {
  background: rgba(255, 91, 91, 0.06);
  border: 1px solid rgba(255, 91, 91, 0.28);
  border-left: 4px solid var(--abp);
  border-radius: 8px;
  padding: 0.8rem 1rem;
}
.ledger li::marker { color: var(--abp); }
.refs { font-size: 0.86rem; }
.refs em { color: var(--ink); }
.links { margin-top: 1.1rem; font-size: 0.95rem; }

/* ---------------- Footer ---------------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.2rem 0 2rem;
  color: var(--ink-faint);
  font-size: 0.82rem;
}
.site-footer a { color: var(--ink-dim); }

/* ---------------- Responsive ---------------- */
@media (max-width: 780px) {
  .monitor-block { grid-template-columns: 1fr; }
  .readouts {
    grid-template-rows: none;
    grid-template-columns: repeat(2, 1fr);
  }
  .monitor { height: clamp(300px, 46vh, 460px); }
}
@media (max-width: 440px) {
  .readouts { grid-template-columns: 1fr 1fr; }
  .buttons .btn { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
}

/* ---------------- Light-mode chrome (monitor stays dark) ---------------- */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #eef2f8;
    --bg-2: #ffffff;
    --panel: #ffffff;
    --panel-2: #f2f5fa;
    --line: #d5deeb;
    --line-soft: #e4eaf3;
    --ink: #12203a;
    --ink-dim: #47597a;
    --ink-faint: #7688a3;
    --accent: #1b6fe0;
    --shadow: 0 8px 24px rgba(20, 40, 80, 0.12);
  }
  body {
    background:
      radial-gradient(1000px 500px at 75% -10%, rgba(27, 111, 224, 0.08), transparent 60%),
      var(--bg);
  }
  /* keep the scope a true bedside monitor: always dark */
  .monitor { background: linear-gradient(180deg, #05070d, #04060b); border-color: #1e2b45; }
  #about code { color: #0d47a1; background: #eef3fb; }
  .btn--primary { color: #12803f; }
  .btn--accent  { color: #0d47a1; }
}