:root {
  color-scheme: light dark;
  --bg: #f4f1ec;
  --bg-deep: #ebe5dc;
  --panel: #fffdf9;
  --panel-soft: #faf6ef;
  --text: #202a33;
  --muted: #667085;
  --border: #e2dacf;
  --border-strong: #cfc4b5;
  --accent: #a84338;
  --accent-hover: #8f352c;
  --accent-soft: #f5e4df;
  --danger: #9f2f2f;
  --shadow: 0 18px 45px rgba(55, 45, 35, 0.07);
  --chart-systolic: #b34a3f;
  --chart-diastolic: #2f6f9f;
  --chart-grid: rgba(90, 80, 70, 0.13);
  --radius: 18px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --bg-deep: #1c1f23;
    --panel: #1f2328;
    --panel-soft: #24292f;
    --text: #eef1f4;
    --muted: #a7b0ba;
    --border: #333a42;
    --border-strong: #4b555f;
    --accent: #e08276;
    --accent-hover: #f09a8f;
    --accent-soft: #3a2725;
    --danger: #f08a8a;
    --shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
    --chart-systolic: #e08276;
    --chart-diastolic: #79b4df;
    --chart-grid: rgba(220, 225, 230, 0.1);
  }
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% -5%, color-mix(in srgb, var(--accent-soft) 70%, transparent), transparent 34rem),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
}

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

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

a {
  color: var(--accent);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 20;
  padding: 0.65rem 1rem;
  border-radius: 0.6rem;
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow);
}

.skip-link:focus {
  top: 1rem;
}

.wrap {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.site-header {
  padding: 3.25rem 0 2rem;
}

.header-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin-top: 0.2rem;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 650;
  letter-spacing: -0.045em;
  line-height: 1.05;
}

.lede {
  max-width: 34rem;
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.58rem 0.95rem;
  background: transparent;
  font-size: 0.87rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease,
    transform 120ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0);
}

.button:focus-visible,
.icon-button:focus-visible,
.segmented button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.button-quiet {
  border-color: var(--border);
  background: color-mix(in srgb, var(--panel) 68%, transparent);
  color: var(--text);
}

.button-quiet:hover {
  border-color: var(--border-strong);
  background: var(--panel);
}

.button-danger-quiet {
  border-color: transparent;
  color: var(--danger);
}

.button-danger-quiet:hover {
  background: color-mix(in srgb, var(--danger) 10%, transparent);
}

.button-primary {
  min-height: 2.9rem;
  padding-inline: 1.5rem;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 28%, transparent);
}

.button-primary:hover {
  background: var(--accent-hover);
}

.button-small {
  padding: 0.4rem 0.7rem;
  font-size: 0.8rem;
}

.banner {
  margin-bottom: 1.25rem;
  padding: 0.85rem 1rem;
  border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--border));
  border-radius: 0.8rem;
  background: color-mix(in srgb, var(--danger) 8%, var(--panel));
  color: var(--danger);
  font-size: 0.9rem;
}

.banner[hidden] {
  display: none;
}

.summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
  margin-bottom: 1.25rem;
}

.stat-card {
  min-width: 0;
  padding: 1.15rem 1.2rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
}

.stat-label {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stat-value {
  margin-top: 0.45rem;
  font-size: clamp(1.4rem, 2.6vw, 1.85rem);
  font-variant-numeric: tabular-nums;
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1.15;
  white-space: nowrap;
}

.stat-note {
  margin-top: 0.3rem;
  overflow: hidden;
  color: var(--muted);
  font-size: 0.78rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.panel {
  margin-bottom: 1.25rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.25rem;
  margin-bottom: 1.2rem;
}

h2 {
  font-size: 1.22rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.panel-sub {
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.segmented {
  display: inline-flex;
  flex-shrink: 0;
  gap: 0.15rem;
  padding: 0.22rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-soft);
}

.segmented button {
  border: 0;
  border-radius: 999px;
  padding: 0.38rem 0.72rem;
  background: transparent;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  cursor: pointer;
}

.segmented button[aria-pressed="true"] {
  background: var(--text);
  color: var(--panel);
}

.chart-wrap {
  position: relative;
  height: clamp(260px, 38vw, 380px);
}

.chart-wrap canvas {
  width: 100% !important;
  height: 100% !important;
}

.empty-chart {
  display: grid;
  place-items: center;
  height: 100%;
  color: var(--muted);
  font-size: 0.92rem;
}

.empty-chart[hidden],
#chart[hidden] {
  display: none;
}

.chart-hint {
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.76rem;
  text-align: right;
}

.log-panel {
  scroll-margin-top: 1rem;
}

.form-top {
  display: flex;
  gap: 0.9rem;
  margin-bottom: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.field-grow {
  flex: 1;
}

.field span,
.reading-row label span {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.field em,
.reading-row em {
  font-style: normal;
  font-weight: 400;
  opacity: 0.8;
}

input[type="text"],
input[type="datetime-local"],
input[type="number"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  padding: 0.62rem 0.72rem;
  background: var(--panel-soft);
  color: var(--text);
  font-variant-numeric: tabular-nums;
  transition: border-color 120ms ease, background 120ms ease;
}

input:hover {
  border-color: var(--border-strong);
}

input:focus {
  border-color: var(--accent);
  background: var(--panel);
  outline: none;
}

input::placeholder {
  color: color-mix(in srgb, var(--muted) 65%, transparent);
}

.readings-fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.readings-fieldset legend {
  margin-bottom: 0.55rem;
  padding: 0;
  color: var(--text);
  font-size: 0.86rem;
  font-weight: 650;
}

#readings {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.reading-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr) auto;
  align-items: end;
  gap: 0.55rem;
}

.reading-row label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 2.55rem;
  height: 2.55rem;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  background: transparent;
  color: var(--muted);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
}

.icon-button:hover:not(:disabled) {
  border-color: color-mix(in srgb, var(--danger) 40%, var(--border));
  background: color-mix(in srgb, var(--danger) 8%, transparent);
  color: var(--danger);
}

.icon-button:disabled {
  opacity: 0.3;
  cursor: default;
}

.add-reading {
  margin-top: 0.7rem;
}

.form-error {
  margin-top: 0.9rem;
  color: var(--danger);
  font-size: 0.86rem;
  font-weight: 600;
}

.form-error[hidden] {
  display: none;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.3rem;
}

.privacy-note {
  color: var(--muted);
  font-size: 0.78rem;
}

#history {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.session {
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--panel-soft);
}

.session-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.session-title {
  min-width: 0;
}

.session h3 {
  font-size: 1.24rem;
  font-variant-numeric: tabular-nums;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.session h3 .unit {
  margin-left: 0.32rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.session-meta {
  margin-top: 0.18rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.session-note {
  margin-top: 0.6rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--border-strong);
  color: var(--text);
  font-size: 0.86rem;
}

.session-readings {
  margin-top: 0.65rem;
  border-top: 1px solid var(--border);
  padding-top: 0.55rem;
}

.session-readings summary {
  width: fit-content;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}

.session-readings summary:hover {
  color: var(--text);
}

.reading-list {
  margin: 0.55rem 0 0;
  padding: 0;
  list-style: none;
}

.reading-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.28rem 0;
  font-size: 0.84rem;
  font-variant-numeric: tabular-nums;
}

.reading-pulse {
  color: var(--muted);
}

.empty-state {
  padding: 2.2rem 1rem;
  border: 1px dashed var(--border-strong);
  border-radius: 0.9rem;
  color: var(--muted);
  text-align: center;
}

.empty-state strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--text);
  font-size: 0.95rem;
}

.empty-state p {
  font-size: 0.84rem;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  padding: 0.5rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.75rem;
}

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 30;
  max-width: min(24rem, calc(100% - 2rem));
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--text);
  color: var(--panel);
  font-size: 0.85rem;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.6rem);
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 860px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 1.25rem;
  }

  .header-actions {
    justify-content: flex-start;
  }

  .summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .wrap {
    width: min(calc(100% - 1.4rem), 1120px);
  }

  .site-header {
    padding-top: 2rem;
  }

  .panel {
    padding: 1.1rem;
  }

  .panel-head {
    flex-direction: column;
    gap: 0.8rem;
  }

  .summary {
    grid-template-columns: 1fr;
  }

  .stat-card {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    column-gap: 1rem;
    padding: 0.9rem 1rem;
  }

  .stat-value {
    grid-column: 2;
    grid-row: 1 / span 2;
    margin: 0;
  }

  .stat-label {
    grid-column: 1;
  }

  .stat-note {
    grid-column: 1;
    margin: 0;
  }

  .form-top {
    flex-direction: column;
  }

  .reading-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 2.55rem;
  }

  .reading-row label:nth-child(3) {
    grid-column: 1 / span 2;
  }

  .reading-row .icon-button {
    grid-column: 3;
    grid-row: 1 / span 2;
    align-self: center;
  }

  .form-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button-primary {
    width: 100%;
  }

  .chart-hint {
    text-align: left;
  }

  .site-footer {
    flex-direction: column;
  }
}