/* ==========================================================================
   PulsOx — component styles. Built on tokens.css. Mobile-first single column
   (max 520px) with three views (Historial / Dashboard / Ajustes) switched by
   a fixed bottom navigation bar.
   ========================================================================== */

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

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

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

h1,
h2,
h3,
p {
  margin: 0;
}

button,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

[hidden] {
  display: none !important;
}

.icon {
  display: block;
  flex-shrink: 0;
}

/* Respect reduced motion globally: kill transitions/animations rather than
   special-casing every rule. (The PPG trace keeps scrolling: that is the
   data itself, not decoration.) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

:focus-visible {
  outline: 2px solid var(--color-ring);
  outline-offset: 2px;
}

h1:focus {
  outline: none;
}

/* ------------------------------------------------------- status contexts */

:root {
  --status-color: var(--color-muted);
  --status-tint: var(--color-status-unknown-tint);
  --status-glow: transparent;
}

[data-status="good"] {
  --status-color: var(--color-status-good);
  --status-tint: var(--color-status-good-tint);
  --status-glow: var(--color-status-good-glow);
}

[data-status="warning"] {
  --status-color: var(--color-status-warning);
  --status-tint: var(--color-status-warning-tint);
  --status-glow: var(--color-status-warning-glow);
}

[data-status="critical"] {
  --status-color: var(--color-status-critical);
  --status-tint: var(--color-status-critical-tint);
  --status-glow: var(--color-status-critical-glow);
}

/* ---------------------------------------------------------------- layout */

.app-shell {
  max-width: 520px;
  margin: 0 auto;
  padding: 8px 20px calc(var(--nav-height) + env(safe-area-inset-bottom, 0px) + 12px);
  padding-top: calc(8px + env(safe-area-inset-top, 0px));
}

.view > * + * {
  margin-top: 12px;
}

.page-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  height: 48px;
  padding-top: 4px;
}

.page-head h1 {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-head__meta {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
}

.section-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-top: 24px;
}

/* ------------------------------------------------------- dashboard header */

.dash-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.brand__mark {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.badge,
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.badge__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-muted);
  flex-shrink: 0;
}

.badge[data-state="live"] .badge__dot {
  background: var(--color-status-good);
}

.badge[data-state="demo"] .badge__dot {
  background: var(--color-primary);
}

.badge[data-state="reconnecting"] .badge__dot {
  background: var(--color-status-warning);
  animation: pulse-dot 1.4s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

.chip {
  gap: 6px;
  padding-left: 10px;
  font-variant-numeric: tabular-nums;
}

.chip[data-low="true"] .chip__icon {
  color: var(--color-status-warning);
}

.chip__icon {
  display: inline-flex;
}

/* ---------------------------------------------------------------- summary */

.summary {
  margin-top: 4px;
}

.summary__row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.summary__icon {
  display: flex;
  color: var(--status-color);
}

.summary__title {
  font-size: 26px;
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.summary__sub {
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.4;
  font-weight: 500;
  color: var(--color-muted);
}

.btn-soft {
  margin-top: 10px;
  height: 40px;
  padding: 0 16px;
  border: none;
  border-radius: var(--radius-pill);
  background: var(--color-primary-tint);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 700;
  transition: opacity var(--motion-fast) var(--ease-standard);
}

.btn-soft:hover {
  opacity: 0.85;
}

/* ------------------------------------------------------------------ cards */

.card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: 14px 18px;
}

.card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.card__title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.card__title {
  font-size: 16px;
  font-weight: 700;
}

.card__aside {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-muted);
}

.card__chip {
  width: 30px;
  height: 30px;
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card__chip--blue {
  background: var(--color-primary-tint);
  color: var(--color-primary);
}

.card__chip--violet {
  background: var(--color-violet-tint);
  color: var(--color-violet);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  background: var(--status-tint);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.status-pill .icon {
  color: var(--status-color);
}

/* ------------------------------------------------------------- SpO2 ring */

.spo2-card {
  padding: 16px 18px 14px;
}

.ring {
  position: relative;
  width: 176px;
  height: 186px;
  margin: 2px auto 0;
}

.ring__svg {
  position: absolute;
  left: 0;
  top: 0;
  width: 176px;
  height: 176px;
  overflow: visible;
}

.ring__track,
.ring__fill {
  fill: none;
  stroke-width: 14;
  stroke-linecap: round;
}

.ring__track {
  stroke: var(--color-track);
  stroke-dasharray: 405.27 540.35;
}

.ring__fill {
  stroke: var(--status-color);
  stroke-dasharray: 0.001 540.35;
  opacity: 0;
  filter: drop-shadow(0 0 9px var(--status-glow));
  transition: stroke-dasharray var(--motion-slow) var(--ease-standard), opacity var(--motion-base) var(--ease-standard);
}

.ring[data-has-value="true"] .ring__fill {
  opacity: 1;
}

.ring__tick {
  stroke: var(--color-surface);
  stroke-width: 3;
}

.ring__center {
  position: absolute;
  left: 0;
  top: 0;
  width: 176px;
  height: 176px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-bottom: 12px;
}

.ring__value-row {
  display: flex;
  align-items: baseline;
  gap: 3px;
}

.ring__value {
  font-size: 66px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
}

.ring__unit {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-muted);
}

.ring__caption {
  font-size: 12px;
  line-height: 1.3;
  font-weight: 500;
  color: var(--color-muted);
  text-align: center;
  white-space: pre-line;
}

.status-pill--ring {
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  height: 34px;
  padding: 0 14px;
  font-size: 14px;
}

/* ------------------------------------------------------- heart rate card */

.bpm-value-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
}

.bpm-reading {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.bpm-value {
  font-size: 52px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.bpm-unit {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-muted);
}

/* "no data" dash: a thin muted glyph instead of a heavy black bar */
.ring__value[data-empty="true"],
.bpm-value[data-empty="true"] {
  color: var(--color-muted);
  font-weight: 500;
}

/* ------------------------------------------------------------- PPG card */

.ppg-card {
  padding: 14px 18px 10px;
}

.ppg-card .card__head {
  height: 26px;
}

.ppg-tag {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 9px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-2);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-muted);
}

.signal-bars {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 18px;
}

.signal-bars span {
  width: 4px;
  border-radius: 2px;
  background: var(--color-track);
  transition: background var(--motion-base) var(--ease-standard);
}

.signal-bars span:nth-child(1) { height: 6px; }
.signal-bars span:nth-child(2) { height: 9px; }
.signal-bars span:nth-child(3) { height: 12px; }
.signal-bars span:nth-child(4) { height: 15px; }
.signal-bars span:nth-child(5) { height: 18px; }

.signal-bars span.is-on {
  background: var(--color-primary);
}

.ppg-wrap {
  position: relative;
  height: 112px;
  margin-top: 6px;
}

.ppg-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.ppg-empty {
  position: absolute;
  left: 0;
  right: 0;
  top: 18px;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  pointer-events: none;
}

/* -------------------------------------------------------- segmented/pills */

.segmented {
  display: flex;
  padding: 3px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-2);
}

.segmented button {
  flex: 1;
  height: 34px;
  border: none;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 700;
  transition: background var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard);
}

.segmented button.is-active {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.segmented--ink button.is-active {
  background: var(--color-foreground);
  color: var(--color-background);
}

.segmented--sm button {
  height: 32px;
  font-size: 13px;
}

.segmented--lg button {
  height: 40px;
}

/* ---------------------------------------------------------------- history */

.trend-card {
  margin-top: 10px;
  padding: 16px 16px 14px;
}

.chart-wrap {
  margin-top: 12px;
}

.chart-canvas-wrap {
  position: relative;
  height: 156px;
}

.chart-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px 24px;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  pointer-events: none;
}

.trend-card .segmented--sm {
  margin-top: 10px;
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.filter-chips button {
  height: 36px;
  padding: 0 16px;
  border: none;
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 700;
  transition: background var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard);
}

.filter-chips button.is-active {
  background: var(--color-foreground);
  color: var(--color-background);
}

.history-group {
  margin-top: 18px;
}

.history-group__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px 8px;
  margin: 0 6px 8px;
}

.history-group__heading {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0 8px;
  min-width: 0;
}

.history-group__title {
  font-size: 14px;
  font-weight: 700;
}

.history-group__meta {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-muted);
}

/* The signal of one measurement: a button in the group head opens a panel with
   the whole recording as a strip that scrolls sideways. */
.signal-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border: none;
  border-radius: var(--radius-pill);
  background: var(--color-violet-tint);
  color: var(--color-violet);
  font-size: 13px;
  font-weight: 700;
  transition: opacity var(--motion-fast) var(--ease-standard);
}

.signal-toggle:hover {
  opacity: 0.85;
}

.signal-toggle[aria-expanded="true"] {
  background: var(--color-violet);
  color: var(--color-on-primary);
}

.signal-panel {
  margin-bottom: 10px;
  padding: 12px 0 10px;
  background: var(--color-surface);
  border-radius: var(--radius-card-sm);
}

.signal-panel[hidden] {
  display: none;
}

.signal-panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 0 16px 6px;
}

.signal-panel__title {
  font-size: 13px;
  font-weight: 700;
}

.signal-panel__meta {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
}

.signal-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
}

.signal-scroll:focus-visible {
  outline-offset: -2px;
}

.signal-canvas {
  display: block;
  height: 140px; /* PPG_STRIP_HEIGHT; the width is set when it is drawn */
}

.signal-panel__hint,
.signal-panel__msg {
  margin: 6px 16px 0;
  font-size: 13px;
  line-height: 1.4;
  font-weight: 500;
  color: var(--color-muted);
}

.signal-panel .btn-soft {
  margin: 8px 16px 0;
}

.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--color-surface);
  border-radius: var(--radius-card-sm);
  overflow: hidden;
}

.history-row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line);
}

.history-row:last-child {
  border-bottom: none;
}

.history-row__icon {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  background: var(--status-tint);
  color: var(--status-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.history-row__body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.history-row__readings {
  font-size: 16px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.history-row__label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-muted);
}

.history-row__time {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.history-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  margin-top: 18px;
  padding: 28px 16px;
  background: var(--color-surface);
  border-radius: var(--radius-card-sm);
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 600;
  text-align: center;
}

/* --------------------------------------------------------------- settings */

.settings-group {
  margin-top: 24px;
}

.settings-group__title {
  margin: 0 0 10px 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.settings-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field label {
  font-size: 14px;
  font-weight: 600;
}

.field input[type="text"],
.field input[type="number"] {
  width: 100%;
  height: 52px;
  padding: 0 16px;
  border: 2px solid transparent;
  border-radius: var(--radius-control);
  background: var(--color-surface-2);
  color: var(--color-foreground);
  font-size: 17px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.field input::placeholder {
  color: var(--color-muted);
  opacity: 0.8;
}

.field input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.settings-subgroup {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.field-hint {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-muted);
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 6px;
}

.toggle-row__label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toggle-row__label strong {
  font-size: 16px;
  font-weight: 700;
}

.toggle-row__label span {
  font-size: 13px;
  line-height: 1.4;
  font-weight: 500;
  color: var(--color-muted);
}

.switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 32px;
  flex-shrink: 0;
}

.switch input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 1;
}

.switch__track {
  position: absolute;
  inset: 0;
  background: var(--color-track);
  border-radius: 999px;
  transition: background var(--motion-fast) var(--ease-standard);
}

.switch__track::before {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  left: 3px;
  top: 3px;
  background: #ffffff;
  border-radius: 50%;
  transition: transform var(--motion-fast) var(--ease-standard);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.switch input:checked + .switch__track {
  background: var(--color-primary);
}

.switch input:checked + .switch__track::before {
  transform: translateX(20px);
}

.switch input:focus-visible + .switch__track {
  outline: 2px solid var(--color-ring);
  outline-offset: 2px;
}

.btn-primary,
.btn-destructive {
  width: 100%;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 18px;
  font-size: 16px;
  font-weight: 700;
  transition: opacity var(--motion-fast) var(--ease-standard);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-destructive {
  background: var(--color-destructive-tint);
  color: var(--color-destructive);
}

.btn-primary:hover,
.btn-destructive:hover {
  opacity: 0.88;
}

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

.settings-disclaimer {
  margin: 24px 4px 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--color-muted);
}

/* -------------------------------------------------------------- bottom nav */

.bottom-nav {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  z-index: 40;
  width: 100%;
  max-width: 520px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 8px 12px calc(14px + env(safe-area-inset-bottom, 0px));
  background: var(--color-surface);
  border-top: 1px solid var(--color-line);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-height: 56px;
  padding: 4px 0;
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
}

.nav-item__icon {
  width: 60px;
  height: 32px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--motion-base) var(--ease-standard), color var(--motion-base) var(--ease-standard);
}

.nav-item[aria-current="page"] {
  color: var(--color-foreground);
  font-weight: 800;
}

.nav-item[aria-current="page"] .nav-item__icon {
  background: var(--color-primary-tint);
  color: var(--color-primary);
}

/* ------------------------------------------------------------------ toast */

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--nav-height) + 16px + env(safe-area-inset-bottom, 0px));
  transform: translate(-50%, 12px);
  max-width: calc(100% - 40px);
  background: var(--color-foreground);
  color: var(--color-background);
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-raised);
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--motion-base) var(--ease-standard), transform var(--motion-base) var(--ease-standard);
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
  pointer-events: auto;
}