:root {
  color-scheme: dark;
  --bg: #071321;
  --bg-deep: #040b13;
  --surface: #0d1c2b;
  --surface-raised: #14283b;
  --surface-soft: #0a1826;
  --text: #f4f7fa;
  --muted: #aab8c6;
  --subtle: #8293a5;
  --line: #35495e;
  --control-line: #66788e;
  --accent: #f4b657;
  --accent-hover: #ffc66d;
  --accent-ink: #211608;
  --danger-soft: #2b1c1a;
  --max-width: 1220px;
  --content-width: 1120px;
  --radius: 12px;
  --radius-small: 9px;
  --shadow: 0 22px 60px rgb(0 0 0 / 24%);
  --display-font: "Iowan Old Style", "Baskerville", "Times New Roman", serif;
  --body-font: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-width: 0;
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--body-font);
  font-size: 16px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background:
    radial-gradient(circle at 78% 17%, rgb(244 182 87 / 7%), transparent 27rem),
    linear-gradient(180deg, var(--bg-deep), var(--bg) 34rem);
  content: "";
  pointer-events: none;
}

a {
  color: inherit;
  text-decoration-color: rgb(244 182 87 / 66%);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  text-decoration-color: var(--accent);
}

button,
input,
select {
  font: inherit;
}

button,
select,
input {
  min-height: 46px;
}

button {
  cursor: pointer;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  transform: translateY(-160%);
  border-radius: var(--radius-small);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 800;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  display: flex;
  width: min(100% - 56px, var(--max-width));
  min-height: 58px;
  margin: 0 auto;
  align-items: center;
  border-bottom: 1px solid var(--line);
  gap: 28px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 780;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.wordmark-mark {
  position: relative;
  display: inline-block;
  width: 21px;
  height: 21px;
  flex: 0 0 auto;
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.wordmark-mark::after {
  position: absolute;
  top: -3px;
  right: -3px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg-deep);
  box-shadow: -2px 2px 0 0 var(--accent);
  content: "";
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 0.88rem;
}

.site-header nav a,
.site-footer nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-header nav a:hover,
.site-footer nav a:hover {
  color: var(--text);
}

.review-stamp {
  margin: 0 0 0 auto;
  color: var(--subtle);
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.instrument-hero {
  width: min(100% - 64px, var(--max-width));
  min-height: calc(100vh - 58px);
  margin: 0 auto;
  padding: 18px 0 30px;
}

.hero-heading {
  display: flex;
  min-height: 82px;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
}

.hero-heading h1,
.section-intro h2,
.legal-content h1,
.error-main h1 {
  margin: 0;
  font-family: var(--display-font);
  font-weight: 500;
  letter-spacing: -0.045em;
}

.hero-heading h1 {
  font-size: clamp(2.25rem, 3.7vw, 3rem);
  line-height: 1;
}

.hero-heading p {
  max-width: 740px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.45;
}

.text-link {
  color: var(--text);
  font-weight: 700;
}

.hero-guide-link {
  flex: 0 0 auto;
  margin-bottom: 4px;
  font-size: 0.85rem;
}

.instrument-grid {
  display: grid;
  margin-top: 17px;
  grid-template-columns: minmax(0, 45fr) minmax(360px, 55fr);
  gap: 22px 30px;
}

.planner-panel,
.result-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgb(13 28 43 / 94%);
  box-shadow: var(--shadow);
}

.planner-panel {
  align-self: start;
  padding: 20px;
}

.planner-row {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(150px, 0.85fr);
  gap: 16px;
}

.field-group,
.time-panel > div,
.assumption-grid > div {
  min-width: 0;
}

.field-group > label,
.time-panel > label,
.time-panel > div > label,
.assumption-grid label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 720;
  letter-spacing: 0.015em;
}

select,
input[type="number"],
input[type="datetime-local"] {
  width: 100%;
  border: 1px solid var(--control-line);
  border-radius: var(--radius-small);
  background: var(--bg-deep);
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

select,
input[type="number"] {
  padding: 9px 11px;
}

input[type="datetime-local"] {
  padding: 8px 10px;
  color-scheme: dark;
}

select:hover,
input:hover {
  border-color: var(--muted);
}

.field-note,
.share-notice,
.source-line,
.legal-date {
  margin: 6px 0 0;
  color: var(--subtle);
  font-size: 0.74rem;
  line-height: 1.38;
}

.age-guidance {
  display: grid;
  min-height: 2.8em;
  margin: 7px 0 0;
  align-content: start;
  color: var(--subtle);
  font-size: 0.7rem;
  line-height: 1.35;
}

.age-guidance span {
  font-weight: 720;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.age-guidance strong {
  color: var(--text);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
}

.target-field input {
  font-weight: 760;
}

.mode-fieldset {
  min-width: 0;
  margin: 15px 0 0;
  padding: 0;
  border: 0;
}

.mode-fieldset legend {
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 720;
}

.mode-switch {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 7px;
}

.mode-switch label {
  position: relative;
  min-width: 0;
}

.mode-switch input {
  position: absolute;
  width: 1px;
  height: 1px;
  min-height: 0;
  opacity: 0;
}

.mode-switch span {
  display: flex;
  min-height: 46px;
  padding: 7px 8px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--control-line);
  border-radius: var(--radius-small);
  background: var(--bg-deep);
  color: var(--muted);
  font-size: 0.73rem;
  font-weight: 700;
  line-height: 1.15;
  text-align: center;
  transition:
    border-color 180ms ease,
    background 180ms ease,
    color 180ms ease;
}

.mode-switch input:checked + span {
  border: 2px solid var(--accent);
  background: var(--surface-raised);
  color: var(--text);
  box-shadow: inset 0 -3px 0 rgb(244 182 87 / 38%);
}

.mode-switch input:focus-visible + span {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.time-panel {
  margin-top: 14px;
}

.time-panel > label,
.time-panel > div > label {
  margin-bottom: 6px;
}

.quick-times {
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 6px;
  gap: 5px;
}

.quick-times button {
  flex: 1 1 auto;
  min-width: 64px;
  min-height: 44px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.68rem;
  font-variant-numeric: tabular-nums;
  font-weight: 760;
}

.quick-times button:hover {
  border-color: var(--accent);
  color: var(--text);
}

.time-panel-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.assumptions {
  margin-top: 12px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.assumptions summary {
  display: flex;
  min-height: 44px;
  align-items: center;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.79rem;
  font-weight: 720;
}

.assumptions summary::marker {
  color: var(--accent);
}

.assumption-grid {
  display: grid;
  padding: 2px 0 13px;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.wind-down-tips {
  padding: 0 0 13px;
  color: var(--subtle);
  font-size: 0.7rem;
}

.wind-down-tips p {
  margin: 0;
  color: var(--muted);
  font-weight: 720;
}

.wind-down-tips ul {
  margin: 5px 0 0;
  padding-left: 18px;
}

.wind-down-tips li + li {
  margin-top: 3px;
}

.primary-button,
.secondary-button {
  border-radius: var(--radius-small);
  font-weight: 800;
  transition:
    background 180ms ease,
    border-color 180ms ease,
    transform 180ms ease;
}

.primary-button {
  width: 100%;
  min-height: 50px;
  margin-top: 14px;
  padding: 10px 16px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
}

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

.primary-button:active,
.secondary-button:active {
  transform: translateY(1px);
}

.noscript-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.dial-panel {
  display: grid;
  min-width: 0;
  padding: 6px 18px 0;
  align-content: start;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.dial-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 24px;
}

.section-label {
  margin: 0 0 5px;
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.dial-heading h2 {
  margin: 0;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
}

.dial-heading > p {
  max-width: 230px;
  margin: 0;
  color: var(--subtle);
  font-size: 0.72rem;
  line-height: 1.4;
  text-align: right;
}

.dial-wrap {
  display: grid;
  width: min(100%, 370px);
  margin: 0 auto;
  place-items: center;
}

.sleep-dial {
  display: block;
  width: 100%;
  max-height: 350px;
  overflow: visible;
  touch-action: none;
}

.dial-outer,
.dial-track {
  fill: none;
}

.dial-outer {
  stroke: var(--line);
  stroke-width: 1;
}

.dial-track {
  stroke: var(--control-line);
  stroke-width: 7;
}

.dial-ticks line {
  stroke: var(--control-line);
  stroke-width: 1;
}

.dial-ticks .dial-tick-major {
  stroke: var(--muted);
  stroke-width: 2;
}

.sleep-arc {
  fill: none;
  stroke: var(--accent);
  stroke-linecap: round;
  stroke-width: 9;
  transition: d 180ms ease;
}

.guidance-window-arc {
  fill: none;
  stroke: var(--control-line);
  stroke-linecap: round;
  stroke-width: 5;
}

.guidance-minimum-tick {
  stroke: var(--muted);
  stroke-linecap: square;
  stroke-width: 3;
}

.arc-handle-visual {
  stroke: var(--bg-deep);
  stroke-width: 3;
  pointer-events: none;
}

.arc-handle-bed {
  fill: var(--text);
}

.arc-handle-wake {
  fill: var(--accent);
}

.arc-handle-visual.is-disabled {
  r: 5px;
  fill: var(--control-line);
  opacity: 0.68;
  stroke-width: 2;
}

.arc-handle-hit {
  fill: transparent;
  cursor: grab;
  outline: none;
}

.arc-handle-hit:active {
  cursor: grabbing;
}

.arc-handle-hit[aria-disabled="true"] {
  cursor: default;
}

.arc-handle-hit:focus-visible {
  stroke: var(--accent);
  stroke-width: 3;
}

.sleep-dial.is-unavailable .sleep-arc,
.sleep-dial.is-unavailable .guidance-window-arc,
.sleep-dial.is-unavailable .guidance-minimum-tick,
.sleep-dial.is-unavailable .arc-handle-visual {
  opacity: 0.28;
}

.dial-cardinal {
  fill: var(--subtle);
  font-family: var(--body-font);
  font-size: 6px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.dial-duration {
  fill: var(--text);
  font-family: var(--display-font);
  font-size: 22px;
  font-variant-numeric: tabular-nums;
}

.dial-duration-label {
  fill: var(--subtle);
  font-family: var(--body-font);
  font-size: 5px;
  font-weight: 780;
  letter-spacing: 0.12em;
}

.dial-legend {
  display: grid;
  width: min(100%, 370px);
  margin: -2px auto 0;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.dial-legend div {
  display: flex;
  min-width: 0;
  padding-top: 9px;
  align-items: baseline;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  gap: 10px;
}

.dial-legend dt {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--subtle);
  font-size: 0.72rem;
}

.dial-legend dd {
  margin: 0;
  color: var(--text);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  font-weight: 760;
}

.dial-legend .dial-legend-guidance {
  grid-column: 1 / -1;
}

.legend-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.legend-dot-bed {
  background: var(--text);
}

.legend-dot-wake {
  background: var(--accent);
}

.legend-line {
  width: 12px;
  height: 4px;
  border-radius: 2px;
  background: var(--control-line);
}

.result-panel {
  position: relative;
  padding: 26px;
  grid-column: 1 / -1;
  animation: result-in 190ms ease-out both;
}

@keyframes result-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}

.result-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 28px;
}

.result-heading h2 {
  margin: 0;
  font-family: var(--display-font);
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.official-block {
  max-width: 320px;
  padding-left: 20px;
  border-left: 2px solid var(--accent);
}

.official-block span {
  display: block;
  color: var(--subtle);
  font-size: 0.7rem;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.official-block strong {
  display: block;
  margin-top: 2px;
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
}

.official-block p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.4;
}

.primary-result {
  display: grid;
  margin-top: 22px;
  padding: 18px 0;
  grid-template-columns: minmax(150px, 0.3fr) 1fr;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  gap: 18px;
}

.primary-result span {
  align-self: center;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 760;
}

.primary-result strong {
  font-size: clamp(1.12rem, 2.4vw, 1.7rem);
  font-variant-numeric: tabular-nums;
}

.primary-value-stack {
  display: grid;
  gap: 2px;
}

#from-now {
  color: var(--muted);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  font-weight: 650;
}

.timing-grid {
  display: grid;
  margin: 20px 0 0;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.timing-grid div {
  min-width: 0;
}

.timing-grid dt {
  color: var(--subtle);
  font-size: 0.7rem;
}

.timing-grid dd {
  margin: 3px 0 0;
  font-size: 0.81rem;
  font-variant-numeric: tabular-nums;
  font-weight: 720;
  line-height: 1.35;
}

.window-note,
.date-note,
.boundary-note,
.under-six-result {
  margin: 18px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--accent);
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.84rem;
}

.window-options {
  margin-top: 12px;
}

.window-options > p {
  margin: 0 0 7px;
  color: var(--subtle);
  font-size: 0.7rem;
  font-weight: 760;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

#window-option-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 8px;
}

.option-chip {
  display: grid;
  min-height: 56px;
  padding: 7px 10px;
  align-content: center;
  border: 1px solid var(--control-line);
  border-radius: var(--radius-small);
  background: var(--bg-deep);
  color: var(--muted);
  line-height: 1.25;
  text-align: left;
}

.option-chip span {
  font-size: 0.7rem;
}

.option-chip strong {
  color: var(--text);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}

.option-chip:hover {
  border-color: var(--accent);
}

.option-chip[aria-pressed="true"] {
  border: 2px solid var(--accent);
  background: var(--surface-raised);
  box-shadow: inset 0 -3px 0 rgb(244 182 87 / 38%);
}

.date-note {
  border-left-color: var(--control-line);
}

.calculation-note {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.calculation-note h3 {
  margin: 0 0 4px;
  font-size: 0.85rem;
}

.calculation-note p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.result-actions {
  display: flex;
  margin-top: 20px;
  flex-wrap: wrap;
  gap: 9px;
}

.secondary-button {
  min-height: 44px;
  padding: 8px 13px;
  border: 1px solid var(--control-line);
  background: transparent;
  color: var(--text);
  font-size: 0.8rem;
}

.secondary-button:hover {
  border-color: var(--accent);
  background: var(--surface-raised);
}

.action-status {
  min-height: 1.35em;
  margin: 6px 0 0;
  color: var(--accent);
  font-size: 0.76rem;
}

.safety-note {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.76rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

.clipboard-fallback {
  position: fixed;
  top: -1000px;
  left: -1000px;
}

.content-section {
  width: min(100% - 64px, var(--content-width));
  margin: 0 auto;
  padding: 88px 0;
  border-top: 1px solid var(--line);
}

.section-intro {
  display: grid;
  margin-bottom: 34px;
  grid-template-columns: minmax(280px, 0.7fr) minmax(320px, 1fr);
  align-items: end;
  gap: 36px;
}

.section-intro .section-label {
  grid-column: 1;
}

.section-intro h2 {
  grid-column: 1;
  font-size: clamp(2rem, 4vw, 3.35rem);
  line-height: 1.05;
}

.section-intro > p:not(.section-label) {
  margin: 0;
  grid-column: 2;
  grid-row: 1 / span 2;
  color: var(--muted);
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border-top: 1px solid var(--control-line);
  border-bottom: 1px solid var(--control-line);
}

table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 13px 15px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

thead th {
  color: var(--subtle);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

tbody th {
  font-size: 0.82rem;
}

tbody td {
  color: var(--muted);
  font-size: 0.84rem;
}

tbody td:last-child {
  color: var(--text);
  font-weight: 720;
}

tbody tr:last-child th,
tbody tr:last-child td {
  border-bottom: 0;
}

.source-line {
  margin-top: 14px;
}

.method-layout {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 44px;
}

.formula-list > div {
  display: grid;
  padding: 17px 0;
  grid-template-columns: 160px 1fr;
  border-top: 1px solid var(--line);
  gap: 24px;
}

.formula-list > div:last-child {
  border-bottom: 1px solid var(--line);
}

.formula-list h3,
.cycle-note h3,
.clinical-note h3 {
  margin: 0;
  font-size: 0.92rem;
}

.formula-list p,
.cycle-note p,
.clinical-note p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.cycle-note {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.cycle-note h3 {
  margin: 7px 0 12px;
  font-family: var(--display-font);
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.2;
}

.cycle-note .text-link {
  display: inline-block;
  margin-top: 17px;
  font-size: 0.8rem;
}

.clinical-note {
  display: grid;
  margin-top: 40px;
  padding: 22px 0;
  grid-template-columns: 200px 1fr;
  border-top: 1px solid var(--control-line);
  border-bottom: 1px solid var(--control-line);
  gap: 24px;
}

.source-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: sources;
}

.source-list li {
  display: grid;
  padding: 15px 0;
  grid-template-columns: minmax(260px, 0.7fr) 1fr;
  border-top: 1px solid var(--line);
  counter-increment: sources;
  gap: 28px;
}

.source-list li::before {
  display: none;
  content: counter(sources);
}

.source-list a {
  font-weight: 750;
}

.source-list span {
  color: var(--muted);
  font-size: 0.84rem;
}

.faq-list {
  border-top: 1px solid var(--control-line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  display: flex;
  min-height: 62px;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 720;
  gap: 20px;
}

.faq-list summary::after {
  color: var(--accent);
  content: "+";
  font-size: 1.25rem;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list summary::marker {
  content: "";
}

.faq-list p {
  max-width: 780px;
  margin: -2px 0 20px;
  color: var(--muted);
}

.site-footer {
  display: flex;
  width: min(100% - 64px, var(--content-width));
  min-height: 130px;
  margin: 0 auto;
  padding: 28px 0;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  gap: 24px;
}

.site-footer p {
  margin: 8px 0 0;
  color: var(--subtle);
  font-size: 0.78rem;
}

.site-footer nav {
  display: flex;
  gap: 20px;
  font-size: 0.84rem;
}

.legal-dialog {
  width: min(760px, calc(100% - 32px));
  max-height: min(86vh, 820px);
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--control-line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 30px 90px rgb(0 0 0 / 55%);
}

.legal-dialog::backdrop {
  background: rgb(1 5 9 / 76%);
  backdrop-filter: blur(4px);
}

.legal-dialog-frame {
  position: relative;
  max-height: inherit;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.legal-dialog-body {
  padding: 40px clamp(20px, 6vw, 58px) 50px;
}

.dialog-close {
  position: sticky;
  z-index: 2;
  top: 12px;
  float: right;
  width: 44px;
  min-height: 44px;
  margin: 12px 12px -56px 0;
  border: 1px solid var(--control-line);
  border-radius: 50%;
  background: var(--bg-deep);
  color: var(--text);
  font-size: 1.45rem;
  line-height: 1;
}

.legal-page::before {
  background: linear-gradient(180deg, var(--bg-deep), var(--bg));
}

.legal-header {
  justify-content: space-between;
}

.legal-main {
  width: min(100% - 40px, 760px);
  margin: 0 auto;
  padding: 72px 0 96px;
}

.legal-content h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1;
}

.legal-content h2 {
  margin: 34px 0 8px;
  font-size: 1rem;
}

.legal-content p {
  color: var(--muted);
}

.legal-content .legal-date {
  margin-top: 12px;
}

.legal-footer {
  min-height: 90px;
}

.error-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
}

.error-main {
  width: min(100% - 40px, 650px);
}

.error-main h1 {
  font-size: clamp(2.5rem, 8vw, 5.5rem);
  line-height: 0.98;
}

.error-main > p:not(.section-label) {
  color: var(--muted);
}

.button-link {
  display: inline-flex;
  width: auto;
  margin-top: 14px;
  align-items: center;
  text-decoration: none;
}

@media (max-width: 980px) {
  .review-stamp {
    display: none;
  }

  .instrument-hero {
    width: min(100% - 40px, 760px);
  }

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

  .planner-panel {
    order: 1;
  }

  .result-panel {
    order: 2;
    grid-column: auto;
  }

  .dial-panel {
    order: 3;
    padding-top: 20px;
  }

  .section-intro,
  .method-layout {
    grid-template-columns: 1fr;
  }

  .section-intro > p:not(.section-label) {
    grid-column: 1;
    grid-row: auto;
  }

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

@media (max-width: 680px) {
  .site-header {
    width: calc(100% - 32px);
    min-height: 52px;
  }

  .site-header nav {
    display: none;
  }

  .instrument-hero {
    width: calc(100% - 32px);
    min-height: auto;
    padding-top: 12px;
  }

  .hero-heading {
    min-height: 0;
    align-items: start;
  }

  .hero-heading h1 {
    font-size: clamp(1.45rem, 7.4vw, 2.2rem);
    white-space: nowrap;
  }

  .hero-heading p {
    max-width: 36rem;
    font-size: 0.82rem;
  }

  .hero-guide-link {
    display: none;
  }

  .instrument-grid {
    margin-top: 14px;
    gap: 18px;
  }

  .planner-panel,
  .result-panel {
    padding: 15px;
  }

  .planner-row,
  .time-panel-pair,
  .assumption-grid {
    grid-template-columns: 1fr;
  }

  .mode-switch {
    grid-template-columns: 1fr;
  }

  .mode-switch span {
    min-height: 46px;
    justify-content: flex-start;
    padding-inline: 13px;
    font-size: 0.8rem;
    text-align: left;
  }

  .dial-panel {
    padding-inline: 0;
  }

  .dial-heading {
    display: block;
  }

  .dial-heading > p {
    margin-top: 5px;
    text-align: left;
  }

  .dial-wrap {
    width: min(100%, 310px);
  }

  .dial-ticks line:not(.dial-tick-major) {
    opacity: 0.45;
  }

  .result-heading,
  .primary-result {
    grid-template-columns: 1fr;
  }

  .result-heading {
    display: grid;
  }

  .official-block {
    max-width: none;
  }

  .primary-result {
    gap: 3px;
  }

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

  .result-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  #window-option-buttons {
    grid-template-columns: 1fr;
  }

  .secondary-button {
    width: 100%;
  }

  .content-section,
  .site-footer {
    width: calc(100% - 32px);
  }

  .content-section {
    padding: 64px 0;
  }

  .section-intro {
    margin-bottom: 25px;
    gap: 14px;
  }

  .section-intro h2 {
    font-size: 2.15rem;
  }

  .formula-list > div,
  .clinical-note,
  .source-list li {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .cycle-note {
    padding: 18px;
  }

  .site-footer {
    align-items: start;
    flex-direction: column;
  }

  .legal-main {
    padding: 50px 0 72px;
  }

  .legal-dialog-body {
    padding-top: 34px;
  }
}

@media (max-width: 350px) {
  .wordmark {
    font-size: 0.9rem;
  }

  .planner-panel {
    padding: 13px;
  }

  .hero-heading h1 {
    font-size: 1.4rem;
  }
}

@media (max-height: 760px) and (min-width: 981px) {
  .instrument-hero {
    padding-top: 12px;
  }

  .hero-heading {
    min-height: 72px;
  }

  .hero-heading h1 {
    font-size: 2.55rem;
  }

  .planner-panel {
    padding: 17px 19px;
  }

  .instrument-grid {
    margin-top: 13px;
  }

  .dial-wrap {
    width: min(100%, 345px);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@page {
  margin: 14mm;
}

@media print {
  :root {
    color-scheme: light;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
  }

  body::before,
  .skip-link,
  .site-header,
  .hero-heading,
  .planner-panel,
  .dial-panel,
  .result-actions,
  .share-notice,
  .action-status,
  .window-options,
  .method-section,
  .sources-section,
  .faq-section,
  .site-footer {
    display: none !important;
  }

  .instrument-hero,
  .content-section {
    width: auto;
    min-height: 0;
    padding: 0;
    border: 0;
  }

  .instrument-grid {
    display: block;
    margin: 0;
  }

  .result-panel {
    padding: 0 0 12mm;
    border: 0;
    background: #fff;
    color: #000;
    box-shadow: none;
    animation: none;
  }

  .age-guide {
    display: block;
    padding-top: 0;
    border-top: 0;
    break-before: page;
  }

  .result-panel *,
  .age-guide *,
  .safety-note {
    color: #000 !important;
    background: transparent !important;
  }

  .table-wrap,
  th,
  td {
    border-color: #777;
  }

  table {
    min-width: 0;
  }
}

@media (forced-colors: active) {
  .dial-track,
  .dial-outer,
  .dial-ticks line,
  .guidance-window-arc,
  .guidance-minimum-tick,
  .sleep-arc,
  .arc-handle-visual {
    stroke: CanvasText;
  }

  .mode-switch input:checked + span {
    border: 3px solid Highlight;
  }
}