/* Hemolux — clinical instrumentation, not a consumer health app.
 *
 * The design language is a laboratory analyser readout: a near-black ground, one
 * signal colour for measurement, monospace tabular numerals so a value does not
 * shift width while it is read. There is no component library; the primitives
 * below are the whole set. The rules that keep it from reading as a generated
 * landing page live in brain/08_UI_SPEC.md section 9 and are followed literally:
 * no gradients, no glass, no emoji, no pill-shaped everything, no centred hero.
 *
 * Dark is the default because the screen is often held close to a face in poor
 * light. Light is a fully specified theme, not an auto-inversion.
 */

:root {
  --bg: #0b0c0e;
  --surface: #141619;
  --surface-2: #1c1f24;
  --text: #e8eaed;
  --text-dim: #9aa0a6;
  --text-faint: #6b7178; /* restricted to 14px and above — see spec §7 */
  --signal: #4cc2ff;
  --ok: #3ddc97;
  --warn: #ffb84d;
  --risk: #ff5c5c;
  --line: #262a30;

  --radius-1: 4px;
  --radius-2: 8px;
  --radius-3: 12px;

  --sans: Inter, "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --deva: "Noto Sans Devanagari", Inter, system-ui, sans-serif;

  --step: 4px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fa;
    --surface: #ffffff;
    --surface-2: #eef0f3;
    --text: #14161a;
    --text-dim: #5a6169;
    --text-faint: #7d848c;
    --signal: #0a72c4;
    --ok: #12855b;
    --warn: #9a5b00;
    --risk: #c0272d;
    --line: #d9dde2;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

:lang(hi) {
  font-family: var(--deva);
}

/* ------------------------------------------------------------------ *
 * Type scale. Numbers are always monospace and always tabular.
 * ------------------------------------------------------------------ */

.num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-dim);
}

h1,
h2,
h3 {
  font-weight: 600;
  line-height: 1.2;
  margin: 0;
}

h1 {
  font-size: 24px;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 18px;
}

p {
  margin: 0 0 12px;
  color: var(--text-dim);
  max-width: 68ch;
}

a {
  color: var(--signal);
  text-underline-offset: 2px;
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
  border-radius: var(--radius-1);
}

/* ------------------------------------------------------------------ *
 * Layout
 * ------------------------------------------------------------------ */

.shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px 96px;
}

@media (max-width: 1024px) {
  .shell {
    max-width: 640px;
  }
}

/* ------------------------------------------------------------------ *
 * Header — wordmark, flat tab nav, language toggle, offline pill
 * ------------------------------------------------------------------ */

.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.masthead__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.wordmark {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--text);
  text-decoration: none;
}

.wordmark span {
  color: var(--signal);
}

.nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav__tab {
  appearance: none;
  border: 1px solid transparent;
  background: none;
  color: var(--text-dim);
  font: inherit;
  font-size: 14px;
  padding: 6px 12px;
  min-height: 36px;
  border-radius: var(--radius-2);
  cursor: pointer;
}

.nav__tab:hover {
  color: var(--text);
}

.nav__tab[aria-current="page"] {
  color: var(--text);
  border-color: var(--line);
  background: var(--surface);
}

.utilities {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  border: 1px solid var(--line);
  border-radius: var(--radius-2);
  padding: 5px 9px;
  min-height: 28px;
}

.pill__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--warn);
}

.pill[data-state="ok"] .pill__dot {
  background: var(--ok);
}

.pill[data-state="offline"] .pill__dot {
  background: var(--text-faint);
}

/* ------------------------------------------------------------------ *
 * Panels and cards — the measuring surfaces
 * ------------------------------------------------------------------ */

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-3);
}

.panel--flush {
  padding: 0;
  overflow: hidden;
}

.panel__body {
  padding: 24px;
}

.rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 24px 0;
}

/* ------------------------------------------------------------------ *
 * Capture
 * ------------------------------------------------------------------ */

.stage {
  position: relative;
  aspect-ratio: 3 / 4;
  max-height: 62vh;
  background: #000;
  overflow: hidden;
}

.stage > video,
.stage > canvas,
.stage > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.stage__guide {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.stage__empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 8px;
  text-align: center;
  color: var(--text-dim);
  padding: 24px;
}

.actionbar {
  display: flex;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

@media (max-width: 480px) {
  .actionbar {
    position: sticky;
    bottom: 0;
  }
}

/* ------------------------------------------------------------------ *
 * Buttons
 * ------------------------------------------------------------------ */

.btn {
  appearance: none;
  font: inherit;
  font-weight: 500;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: var(--radius-2);
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
}

.btn:hover {
  border-color: var(--text-faint);
}

.btn--primary {
  background: var(--signal);
  border-color: var(--signal);
  color: #04121c;
  font-weight: 600;
}

.btn--block {
  width: 100%;
}

.btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

/* ------------------------------------------------------------------ *
 * Result card — the most important screen in the product
 * ------------------------------------------------------------------ */

.readout {
  padding: 24px;
}

.readout__value {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 12px 0 4px;
}

.readout__number {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(48px, 14vw, 72px);
  line-height: 1;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.readout__unit {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--text-dim);
}

.readout__interval {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--text-dim);
}

/* Band bar: estimate position against the WHO ticks. Text carries the verdict;
 * colour is only the third, redundant channel (spec §7). */

.bandbar {
  margin: 20px 0 8px;
}

.bandbar__track {
  position: relative;
  height: 8px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.bandbar__fill {
  position: absolute;
  top: -1px;
  bottom: -1px;
  border-radius: 999px;
  background: var(--signal);
}

.bandbar__tick {
  position: absolute;
  top: -4px;
  bottom: -4px;
  width: 1px;
  background: var(--line);
}

.bandbar__legend {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
}

.verdict {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.verdict[data-band="ok"] {
  color: var(--ok);
}
.verdict[data-band="warn"] {
  color: var(--warn);
}
.verdict[data-band="risk"] {
  color: var(--risk);
}

.disclaimer {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--text-dim);
}

/* ------------------------------------------------------------------ *
 * Abstaining — guidance, never an alarm (spec §4)
 * ------------------------------------------------------------------ */

.notice {
  display: flex;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-2);
  background: var(--surface-2);
}

.notice__mark {
  flex: none;
  width: 3px;
  border-radius: 999px;
  background: var(--warn);
}

.notice[data-tone="neutral"] .notice__mark {
  background: var(--text-faint);
}

.notice[data-tone="error"] .notice__mark {
  background: var(--risk);
}

/* ------------------------------------------------------------------ *
 * Skeleton loading, in the shape of the final content
 * ------------------------------------------------------------------ */

.skeleton {
  background: var(--surface-2);
  border-radius: var(--radius-1);
  animation: pulse 1.4s ease-in-out infinite;
}

.skeleton--line {
  height: 12px;
  margin: 8px 0;
}

.skeleton--number {
  height: 56px;
  width: 180px;
  margin: 12px 0;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.55;
  }
}

/* ------------------------------------------------------------------ *
 * Evidence / method prose blocks
 * ------------------------------------------------------------------ */

.metric-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.metric-row:last-child {
  border-bottom: 0;
}

.metric-row__name {
  color: var(--text);
}

.metric-row__value {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.dim {
  color: var(--text-dim);
}

.faint {
  color: var(--text-faint);
  font-size: 14px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}