:root {
  color-scheme: light;
  --ink: #153b32;
  --ink-deep: #0d2923;
  --ink-soft: #52665f;
  --cream: #f4f0e7;
  --cream-deep: #e8e2d5;
  --paper: #fffdf8;
  --mint: #cfe6da;
  --mint-bright: #a9d8c3;
  --coral: #ee9979;
  --coral-soft: #f5c8b5;
  --sun: #f0cf72;
  --line: rgba(21, 59, 50, 0.16);
  --shadow: 0 24px 70px rgba(19, 48, 40, 0.13);
  --font-body: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--cream);
  font-synthesis: none;
  line-height: 1.58;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background:
    linear-gradient(rgba(21, 59, 50, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21, 59, 50, 0.022) 1px, transparent 1px),
    var(--cream);
  background-size: 32px 32px;
}

body,
button {
  font: inherit;
}

a {
  color: inherit;
}

button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}

::selection {
  color: var(--paper);
  background: var(--ink);
}

.container {
  width: min(1180px, calc(100% - 64px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  border-bottom: 1px solid transparent;
  background: rgba(244, 240, 231, 0.84);
  backdrop-filter: blur(18px);
  transition:
    border-color 200ms ease,
    background-color 200ms ease,
    box-shadow 200ms ease;
}

.site-header.is-scrolled,
.site-header.nav-open {
  border-color: var(--line);
  background: rgba(255, 253, 248, 0.95);
  box-shadow: 0 12px 38px rgba(20, 54, 45, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 82px;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.brand-symbol {
  position: relative;
  width: 29px;
  height: 29px;
  flex: 0 0 auto;
  overflow: hidden;
  border-radius: 52% 48% 40% 60% / 42% 58% 42% 58%;
  background: var(--ink);
  transform: rotate(-9deg);
}

.brand-symbol::before,
.brand-symbol::after {
  position: absolute;
  border-radius: 50%;
  content: "";
}

.brand-symbol::before {
  inset: 7px;
  border: 2px solid var(--mint-bright);
}

.brand-symbol::after {
  width: 6px;
  height: 6px;
  top: 4px;
  right: 4px;
  background: var(--coral);
}

.brand-name {
  font-size: 1.12rem;
  font-weight: 780;
  letter-spacing: -0.035em;
}

.brand-section {
  margin-left: 2px;
  padding: 3px 8px;
  border-radius: 999px;
  color: var(--ink-deep);
  background: var(--mint);
  font-size: 0.72rem;
  font-weight: 760;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  display: block;
  padding: 9px 11px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 0.87rem;
  font-weight: 650;
  text-decoration: none;
  transition:
    color 180ms ease,
    background-color 180ms ease;
}

.nav-list a:hover,
.nav-list a:focus-visible,
.nav-list a[aria-current="page"] {
  color: var(--ink);
  background: rgba(21, 59, 50, 0.08);
}

.nav-toggle {
  display: none;
  place-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  background: var(--paper);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 180ms ease;
}

.nav-toggle span + span {
  margin-top: 5px;
}

.nav-toggle:focus-visible,
.button:focus-visible,
.card-link:focus-visible,
.age-step:focus-visible,
.footer-link:focus-visible,
.age-summary:focus-visible,
.faq summary:focus-visible {
  outline: 3px solid var(--sun);
  outline-offset: 4px;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--ink);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background: var(--coral);
  content: "";
}

.hero,
.article-hero,
.newborn-hero {
  position: relative;
  overflow: hidden;
}

.little-hero {
  min-height: calc(100svh - 82px);
  padding-block: clamp(72px, 10vw, 126px) clamp(100px, 13vw, 164px);
  background:
    radial-gradient(circle at 8% 22%, rgba(240, 207, 114, 0.3), transparent 25%),
    radial-gradient(circle at 88% 80%, rgba(169, 216, 195, 0.42), transparent 27%);
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(330px, 0.72fr);
  align-items: center;
  gap: clamp(48px, 8vw, 110px);
}

.hero-content {
  max-width: 760px;
}

h1 {
  margin-bottom: 28px;
  font-family: var(--font-display);
  font-size: clamp(4rem, 9vw, 7.2rem);
  font-weight: 500;
  letter-spacing: -0.07em;
  line-height: 0.9;
}

.hero-description {
  max-width: 660px;
  margin-bottom: 36px;
  color: var(--ink-soft);
  font-size: clamp(1.04rem, 1.5vw, 1.22rem);
  line-height: 1.65;
}

.button,
.card-link,
.footer-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 52px;
  padding: 13px 21px;
  border-radius: 999px;
  font-weight: 760;
  text-decoration: none;
}

.button {
  color: var(--paper);
  background: var(--ink);
  box-shadow: 0 14px 30px rgba(21, 59, 50, 0.2);
  transition:
    transform 200ms ease,
    background-color 200ms ease,
    box-shadow 200ms ease;
}

.button::after,
.card-link::after,
.footer-link::after {
  line-height: 1;
  content: "↗";
  transition: transform 180ms ease;
}

.button::after {
  content: "↓";
}

.button:hover {
  background: var(--ink-deep);
  box-shadow: 0 18px 36px rgba(21, 59, 50, 0.25);
  transform: translateY(-2px);
}

.button:hover::after {
  transform: translateY(3px);
}

.button--light {
  color: var(--ink-deep);
  background: var(--paper);
  box-shadow: none;
}

.button--light::after {
  content: "↗";
}

.button--light:hover {
  color: var(--ink-deep);
  background: var(--coral-soft);
}

.button--light:hover::after,
.card-link:hover::after,
.footer-link:hover::after {
  transform: translate(2px, -2px);
}

.little-visual {
  position: relative;
  width: min(100%, 440px);
  aspect-ratio: 1;
  justify-self: end;
  border: 1px solid rgba(21, 59, 50, 0.14);
  border-radius: 50px 50px 16px 50px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.74), transparent 48%),
    var(--coral-soft);
  box-shadow: var(--shadow), inset -26px -26px 66px rgba(21, 59, 50, 0.06);
  transform: rotate(1deg);
  animation: little-mobile-float 7.4s ease-in-out infinite;
}

.little-mobile__rail,
.little-mobile__string,
.little-mobile__piece,
.little-mobile__spark {
  position: absolute;
}

.little-mobile__rail {
  width: 64%;
  height: 7px;
  top: 23%;
  left: 18%;
  border-radius: 999px;
  background: var(--ink);
  box-shadow: 0 8px 18px rgba(21, 59, 50, 0.14);
  transform: rotate(5deg);
}

.little-mobile__string {
  width: 2px;
  top: 24%;
  border-radius: 2px;
  background: rgba(21, 59, 50, 0.38);
  transform-origin: top center;
}

.little-mobile__string--one {
  height: 35%;
  left: 29%;
  transform: rotate(3deg);
}

.little-mobile__string--two {
  height: 46%;
  left: 51%;
  transform: rotate(-2deg);
}

.little-mobile__string--three {
  height: 30%;
  left: 72%;
  transform: rotate(-6deg);
}

.little-mobile__piece {
  box-shadow: 0 14px 26px rgba(21, 59, 50, 0.15);
  transform-origin: 50% -110px;
}

.little-mobile__piece--one {
  width: 18%;
  aspect-ratio: 1;
  top: 56%;
  left: 20%;
  border: 5px solid var(--cream);
  border-radius: 26px 26px 8px 26px;
  background: var(--mint-bright);
  animation: little-mobile-sway-one 5.7s ease-in-out infinite;
}

.little-mobile__piece--two {
  width: 21%;
  aspect-ratio: 1;
  top: 67%;
  left: 41%;
  border: 5px solid var(--cream);
  border-radius: 48% 52% 58% 42% / 44% 56% 46% 54%;
  background: var(--sun);
  animation: little-mobile-sway-two 6.4s ease-in-out infinite;
}

.little-mobile__piece--three {
  width: 14%;
  aspect-ratio: 1;
  top: 49%;
  left: 66%;
  border: 5px solid var(--cream);
  border-radius: 50%;
  background: var(--ink);
  animation: little-mobile-sway-three 6s ease-in-out infinite;
}

.little-mobile__spark {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--mint-bright);
  transform: rotate(45deg);
}

.little-mobile__spark--one {
  top: 16%;
  right: 14%;
}

.little-mobile__spark--two {
  bottom: 14%;
  left: 13%;
  width: 11px;
  height: 11px;
  background: var(--cream);
}

.newborn-feature {
  padding-block: clamp(80px, 10vw, 128px);
  color: var(--cream);
  background: var(--ink-deep);
}

.newborn-feature__layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  align-items: end;
  gap: clamp(48px, 9vw, 130px);
}

.newborn-feature .eyebrow,
.sections .eyebrow {
  color: var(--cream);
}

.newborn-feature h2 {
  max-width: 760px;
  margin-bottom: 0;
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 6.8vw, 6.2rem);
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 0.96;
}

.newborn-feature__content {
  padding-top: 28px;
  border-top: 1px solid rgba(244, 240, 231, 0.2);
}

.newborn-feature__content p {
  margin-bottom: 28px;
  color: rgba(244, 240, 231, 0.72);
  font-size: 1.07rem;
}

.age-path,
.newborn-topics {
  padding-block: clamp(92px, 11vw, 144px);
  background: var(--paper);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(160px, 0.28fr) minmax(0, 1fr);
  align-items: start;
  gap: 40px;
  margin-bottom: clamp(48px, 7vw, 78px);
}

.section-heading .section-title {
  max-width: 780px;
  margin-bottom: 0;
  font-size: clamp(3.2rem, 6.5vw, 5.8rem);
}

.section-title {
  margin-bottom: 26px;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.1rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1;
}

.age-path__grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.age-step {
  position: relative;
  display: flex;
  min-height: 210px;
  flex-direction: column;
  padding: 24px 20px;
  border-right: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
}

.age-step:last-child {
  border-right: 0;
}

.age-step__number {
  margin-bottom: auto;
  color: var(--coral);
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.age-step strong {
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  font-weight: 500;
  line-height: 1.05;
}

.age-step > span:last-child {
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.age-step--available {
  transition:
    color 180ms ease,
    background-color 180ms ease,
    transform 180ms ease;
}

.age-step--available:hover,
.age-step--available:focus-visible {
  z-index: 1;
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-8px);
}

.age-step--available:hover .age-step__number,
.age-step--available:focus-visible .age-step__number {
  color: var(--sun);
}

.age-step--available:hover > span:last-child,
.age-step--available:focus-visible > span:last-child {
  color: rgba(255, 253, 248, 0.7);
}

.age-step--active {
  margin-top: -1px;
  border: 0;
  border-radius: 26px 26px 8px 26px;
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-10px);
  transition: transform 200ms ease;
}

.age-step--active:hover {
  transform: translateY(-14px);
}

.age-step--active .age-step__number {
  color: var(--sun);
}

.age-step--active > span:last-child {
  color: rgba(255, 253, 248, 0.7);
}

.sections {
  padding-block: clamp(92px, 11vw, 148px);
  color: var(--cream);
  background: var(--ink-deep);
}

.section-grid,
.newborn-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.card,
.topic-card {
  position: relative;
  display: flex;
  min-height: 300px;
  flex-direction: column;
  align-items: flex-start;
  padding: 28px;
  border: 1px solid rgba(244, 240, 231, 0.16);
  border-radius: 28px 28px 9px 28px;
  background: rgba(255, 255, 255, 0.05);
}

.card-index {
  margin-bottom: auto;
  color: var(--coral);
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.card h3,
.topic-card h3 {
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 2.5vw, 2.25rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.card p,
.topic-card p {
  margin-bottom: 24px;
  color: rgba(244, 240, 231, 0.68);
}

.card--available {
  color: var(--ink-deep);
  background: var(--mint-bright);
}

.card--available p {
  color: rgba(13, 41, 35, 0.72);
}

.card-link {
  min-height: 46px;
  margin-top: auto;
  padding: 11px 17px;
  color: var(--paper);
  background: var(--ink-deep);
  transition:
    color 180ms ease,
    background-color 180ms ease,
    transform 180ms ease;
}

.card-link:hover {
  color: var(--ink-deep);
  background: var(--paper);
  transform: translateY(-2px);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  color: rgba(244, 240, 231, 0.62);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.status::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--coral);
  content: "";
}

.breadcrumbs {
  padding-block: 22px;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li + li::before {
  margin-right: 8px;
  color: var(--ink-soft);
  content: "→";
}

.breadcrumbs li[aria-current="page"] {
  color: var(--ink-soft);
}

.breadcrumbs a {
  text-underline-offset: 3px;
}

.newborn-hero {
  padding-block: clamp(58px, 8vw, 100px) clamp(80px, 10vw, 130px);
  background:
    radial-gradient(circle at 86% 18%, rgba(238, 153, 121, 0.28), transparent 26%),
    var(--mint);
}

.newborn-hero__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.38fr);
  align-items: center;
  gap: 60px;
}

.newborn-hero__mark {
  position: relative;
  width: min(100%, 300px);
  aspect-ratio: 1;
  justify-self: end;
  border-radius: 48px 48px 16px 48px;
  background: var(--coral);
  box-shadow: var(--shadow);
  transform: rotate(-4deg);
}

.newborn-hero__mark::before,
.newborn-hero__mark::after {
  position: absolute;
  border-radius: 50%;
  content: "";
}

.newborn-hero__mark::before {
  width: 42%;
  aspect-ratio: 1;
  left: 15%;
  bottom: 16%;
  border-radius: 24px 24px 7px 24px;
  background: var(--mint);
  box-shadow: 0 14px 30px rgba(21, 59, 50, 0.16);
}

.newborn-hero__mark::after {
  width: 29%;
  aspect-ratio: 1;
  top: 16%;
  right: 15%;
  border: 6px solid var(--paper);
  background: var(--sun);
  box-shadow: 0 14px 28px rgba(21, 59, 50, 0.14);
}

.newborn-topics .notice {
  margin: 0 0 clamp(74px, 9vw, 112px);
}

.newborn-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.newborn-grid--architecture {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.topic-card {
  min-height: 285px;
  border-color: var(--line);
  color: var(--ink);
  background: var(--cream);
}

.topic-card p {
  color: var(--ink-soft);
}

.topic-card .status {
  color: var(--ink-soft);
}

.topic-card--important {
  color: var(--paper);
  background: var(--ink);
}

.topic-card--important p,
.topic-card--important .status {
  color: rgba(255, 253, 248, 0.7);
}

.topic-card--question {
  background: var(--mint);
}

.topic-card--parents {
  background: rgba(238, 153, 121, 0.16);
}

.topic-preview {
  margin: 0 0 26px;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.88rem;
  list-style: none;
}

.topic-preview li {
  position: relative;
  padding-left: 15px;
}

.topic-preview li::before {
  position: absolute;
  width: 5px;
  height: 5px;
  top: 0.65em;
  left: 0;
  border-radius: 50%;
  background: var(--coral);
  content: "";
}

.topic-preview li + li {
  margin-top: 8px;
}

.observation-chain {
  display: flex;
  flex-wrap: wrap;
  gap: 5px 7px;
  margin-top: 4px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink) !important;
  font-size: 0.84rem;
  font-weight: 720;
  line-height: 1.45;
}

.observation-chain span {
  color: var(--coral);
}

.help-levels {
  display: grid;
  gap: 8px;
  width: 100%;
  margin: 2px 0 26px;
  padding: 0;
  list-style: none;
}

.help-level {
  padding: 9px 11px;
  border: 1px solid rgba(255, 253, 248, 0.16);
  border-radius: 10px;
  color: var(--paper);
  font-size: 0.78rem;
  font-weight: 720;
}

.help-level::before {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  content: "";
}

.help-level--home::before {
  background: #78c89a;
}

.help-level--today::before {
  background: var(--sun);
}

.help-level--urgent::before {
  background: var(--coral);
}

.newborn-grid--architecture .card-index {
  margin-bottom: 40px;
}

.newborn-grid--architecture .topic-card h3 {
  min-height: 2.1em;
  margin-bottom: 0;
}

.newborn-grid--architecture .topic-preview,
.newborn-grid--architecture .observation-chain,
.newborn-grid--architecture .help-levels {
  width: 100%;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.newborn-grid--architecture .topic-card--important .help-levels {
  border-color: rgba(255, 253, 248, 0.18);
}

.newborn-grid--architecture .status {
  margin-top: auto;
}

.age-topic-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.topic-card--available {
  background: var(--mint);
}

.topic-card--available .card-link {
  margin-top: auto;
}

.age-detail-hero--one-three {
  background:
    radial-gradient(circle at 86% 18%, rgba(240, 207, 114, 0.3), transparent 26%),
    var(--cream);
}

.age-detail-hero--four-six {
  background:
    radial-gradient(circle at 86% 18%, rgba(238, 153, 121, 0.24), transparent 26%),
    var(--mint);
}

.age-detail-hero--seven-nine {
  background:
    radial-gradient(circle at 86% 18%, rgba(169, 216, 195, 0.5), transparent 27%),
    var(--coral-soft);
}

.age-detail-hero--ten-twelve {
  background:
    radial-gradient(circle at 86% 18%, rgba(240, 207, 114, 0.34), transparent 27%),
    var(--mint);
}

.age-detail-hero--one-three .newborn-hero__mark {
  background: var(--sun);
}

.age-detail-hero--seven-nine .newborn-hero__mark {
  background: var(--mint-bright);
}

.age-detail-hero--ten-twelve .newborn-hero__mark {
  background: var(--ink);
}

.age-materials {
  padding-block: clamp(88px, 11vw, 144px);
  background: var(--cream);
  scroll-margin-top: 82px;
}

.age-materials__header {
  max-width: 780px;
  margin-bottom: clamp(42px, 6vw, 68px);
}

.age-materials__header h2 {
  margin-bottom: 0;
  font-family: var(--font-display);
  font-size: clamp(3rem, 6.2vw, 5.4rem);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.article-lead {
  max-width: 760px;
  margin: 30px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.04rem, 1.45vw, 1.2rem);
  line-height: 1.7;
}

.newborn-article .content-section h3 {
  margin: 38px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 2.8vw, 2.15rem);
  font-weight: 500;
  letter-spacing: -0.025em;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.related-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 12px 12px 4px 12px;
  color: var(--ink);
  background: var(--paper);
  text-decoration: none;
  transition:
    border-color 180ms ease,
    background-color 180ms ease,
    transform 180ms ease;
}

.related-link:hover,
.related-link:focus-visible {
  border-color: rgba(21, 59, 50, 0.32);
  background: var(--mint);
  transform: translateY(-2px);
}

.related-link--important {
  margin-top: 22px;
  color: var(--paper);
  background: var(--ink);
}

.related-link--important:hover,
.related-link--important:focus-visible {
  color: var(--ink);
}

.warning-list {
  padding: 22px 22px 22px 42px;
  border-left: 4px solid var(--coral);
  border-radius: 8px 18px 18px 8px;
  background: var(--paper);
}

.normal-article {
  background: var(--paper);
}

.feeding-article {
  background: var(--mint);
}

.feeding-article .important-note {
  background: var(--paper);
}

.normal-article .toc,
.normal-article .related-link,
.normal-article .warning-list {
  background: var(--cream);
}

.normal-article .related-link--important {
  color: var(--paper);
  background: var(--ink);
}

.normal-article .related-link--important:hover,
.normal-article .related-link--important:focus-visible {
  color: var(--ink);
  background: var(--mint);
}

.article-lead p {
  margin: 0;
}

.article-lead p + p {
  margin-top: 16px;
}

.important-note {
  margin-block: 28px;
  padding: 24px;
  border-left: 4px solid var(--coral);
  border-radius: 8px 18px 18px 8px;
  background: var(--cream);
}

.important-note h3 {
  margin-top: 0 !important;
}

.important-note p:last-child {
  margin-bottom: 0;
}

.normal-main-rule {
  margin-top: 32px;
  padding-inline: clamp(24px, 5vw, 54px);
  border: 0;
  border-radius: 30px 30px 10px 30px;
  color: var(--paper);
  background: var(--ink);
}

.normal-main-rule .section-title,
.normal-main-rule p,
.normal-main-rule .content-list {
  color: var(--paper);
}

.rule-emphasis {
  padding-top: 20px;
  border-top: 1px solid rgba(255, 253, 248, 0.18);
  font-size: 1.06rem;
  font-weight: 700;
}

.article-hero {
  padding-block: clamp(56px, 8vw, 92px) clamp(70px, 9vw, 112px);
  border-radius: 0 0 44px 44px;
  background:
    radial-gradient(circle at 86% 20%, rgba(238, 153, 121, 0.28), transparent 27%),
    var(--mint);
}

.article-container {
  max-width: 900px;
}

.article-hero h1 {
  max-width: 800px;
  font-size: clamp(3.8rem, 8vw, 6.8rem);
}

.notice {
  margin-top: 48px;
  padding: 22px 24px;
  border-left: 4px solid var(--coral);
  border-radius: 8px 18px 18px 8px;
  color: #40504a;
  background: var(--paper);
  box-shadow: 0 12px 34px rgba(21, 59, 50, 0.07);
}

.toc {
  margin-block: 48px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 24px 24px 8px 24px;
  background: var(--paper);
}

.toc h2 {
  margin-bottom: 18px;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 500;
}

.toc ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 30px;
  margin: 0;
  padding-left: 20px;
}

.toc a {
  color: var(--ink);
  text-underline-offset: 4px;
}

.content-section {
  padding-block: 54px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 86px;
}

.content-section > p {
  max-width: 720px;
  color: var(--ink-soft);
}

.content-list {
  max-width: 780px;
  padding-left: 24px;
}

.content-list li + li {
  margin-top: 17px;
}

.content-list p {
  margin: 13px 0 0;
}

.example {
  padding: 17px;
  border-radius: 12px;
  background: var(--mint);
}

.age-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 30px;
}

.age-card {
  overflow: hidden;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 20px 20px 7px 20px;
  background: var(--paper);
}

.age-summary {
  padding: 21px 24px;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 180ms ease;
}

.age-summary:hover,
.age-summary:focus-visible,
.age-card[open] .age-summary {
  background: var(--mint);
}

.age-summary::marker {
  color: var(--coral);
}

.age-card-content {
  padding: 12px 24px 26px;
}

.age-card p {
  max-width: 720px;
}

.age-card h4 {
  margin: 30px 0 12px;
  font-size: 1.05rem;
}

.meal-plan {
  margin: 0;
  padding: 0;
  list-style: none;
}

.meal-plan li {
  padding-block: 10px;
  border-top: 1px solid rgba(21, 59, 50, 0.1);
}

.meal-plan li:last-child {
  border-bottom: 1px solid rgba(21, 59, 50, 0.1);
}

.faq details {
  border-top: 1px solid var(--line);
  background: transparent;
}

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

.faq summary {
  padding: 19px 4px;
  font-weight: 720;
  cursor: pointer;
}

.faq details p {
  padding: 0 4px 19px;
  margin-bottom: 0;
  color: var(--ink-soft);
}

.source-note {
  margin-top: 34px;
  font-size: 0.94rem;
}

.site-footer {
  padding-block: 54px;
  color: var(--cream);
  background: #081e1a;
}

.site-footer .brand {
  color: var(--cream);
}

.site-footer .brand-symbol {
  background: var(--mint-bright);
}

.site-footer .brand-symbol::before {
  border-color: var(--ink-deep);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.footer-link {
  min-height: 46px;
  padding: 10px 17px;
  color: var(--ink-deep);
  background: var(--coral);
  transition:
    background-color 180ms ease,
    transform 180ms ease;
}

.footer-link:hover {
  background: var(--coral-soft);
  transform: translateY(-2px);
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity 650ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 650ms cubic-bezier(0.22, 1, 0.36, 1);
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes little-mobile-float {
  0%,
  100% {
    transform: rotate(1deg) translateY(0);
  }

  50% {
    transform: rotate(-1deg) translateY(-9px);
  }
}

@keyframes little-mobile-sway-one {
  0%,
  100% { transform: rotate(5deg); }
  50% { transform: rotate(-7deg); }
}

@keyframes little-mobile-sway-two {
  0%,
  100% { transform: rotate(-5deg); }
  50% { transform: rotate(6deg); }
}

@keyframes little-mobile-sway-three {
  0%,
  100% { transform: rotate(4deg); }
  50% { transform: rotate(-6deg); }
}

@media (max-width: 1080px) {
  .nav-list a {
    padding-inline: 8px;
    font-size: 0.82rem;
  }

  .hero-layout {
    grid-template-columns: minmax(0, 1fr) minmax(290px, 0.58fr);
    gap: 50px;
  }

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

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

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

  .age-path__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    border-top: 0;
    background: var(--line);
  }

  .age-step {
    border: 0;
    background: var(--paper);
  }

  .age-step--active {
    margin: 0;
    background: var(--ink);
    transform: none;
  }
}

@media (max-width: 880px) {
  .container {
    width: min(100% - 40px, 760px);
  }

  .header-inner {
    min-height: 74px;
    flex-wrap: wrap;
    gap: 0;
  }

  .js .nav-toggle {
    display: grid;
  }

  .main-nav {
    width: 100%;
    padding-bottom: 16px;
  }

  .nav-list {
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding-top: 10px;
    border-top: 1px solid var(--line);
  }

  .nav-list a {
    padding: 11px 4px;
    border-radius: 0;
    font-size: 0.92rem;
  }

  .js .main-nav {
    max-height: 0;
    overflow: hidden;
    padding-bottom: 0;
    opacity: 0;
    visibility: hidden;
    transition:
      max-height 280ms ease,
      opacity 200ms ease,
      padding 280ms ease,
      visibility 280ms ease;
  }

  .js .site-header.nav-open .main-nav {
    max-height: 430px;
    padding-bottom: 16px;
    opacity: 1;
    visibility: visible;
  }

  .site-header.nav-open .nav-toggle span:first-child {
    transform: translateY(3.5px) rotate(45deg);
  }

  .site-header.nav-open .nav-toggle span:last-child {
    transform: translateY(-3.5px) rotate(-45deg);
  }

  .little-hero {
    min-height: auto;
  }

  .hero-layout,
  .newborn-feature__layout,
  .newborn-hero__layout {
    grid-template-columns: 1fr;
  }

  .little-visual {
    width: min(72vw, 380px);
    justify-self: center;
  }

  .newborn-hero__mark {
    width: min(58vw, 260px);
    justify-self: center;
  }

  .newborn-feature__content {
    max-width: 580px;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

@media (max-width: 620px) {
  .container {
    width: min(100% - 32px, 560px);
  }

  html {
    scroll-padding-top: 76px;
  }

  .brand-section {
    display: none;
  }

  h1,
  .article-hero h1 {
    font-size: clamp(3.4rem, 17vw, 5rem);
  }

  .little-hero {
    padding-block: 62px 92px;
  }

  .little-visual {
    width: min(82vw, 330px);
  }

  .newborn-feature h2,
  .section-heading .section-title {
    font-size: clamp(2.9rem, 13vw, 4.2rem);
  }

  .age-path__grid,
  .section-grid,
  .newborn-grid,
  .toc ul {
    grid-template-columns: 1fr;
  }

  .age-step {
    min-height: 168px;
  }

  .card,
  .topic-card {
    min-height: 260px;
  }

  .newborn-grid--architecture .topic-card h3 {
    min-height: 0;
  }

  .article-hero {
    border-radius: 0 0 28px 28px;
  }

  .toc {
    padding: 24px;
  }

  .content-section {
    padding-block: 44px;
  }

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

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

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