:root {
  color-scheme: light;
  --paper: #fff7f2;
  --paper-soft: #fef9f5;
  --paper-deep: #f4ecd9;
  --ink: #20160e;
  --ink-soft: #5b4d45;
  --coral: #e55f4b;
  --coral-soft: #de8975;
  --peach: #f1ddd0;
  --yellow: #fbeab8;
  --green: #91af7e;
  --line: #e8dac9;
  --white: #fffdf9;
  --max: 1120px;
  --header-height: 72px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
  opacity: .1;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.72' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.2'/%3E%3C/svg%3E");
}

a { color: inherit; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { margin-top: 0; line-height: 1.35; letter-spacing: .01em; text-wrap: balance; }
p { text-wrap: pretty; }

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: .6rem 1rem;
  background: var(--ink);
  color: var(--white);
}

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

.model-header {
  position: sticky;
  top: 0;
  z-index: 30;
  min-height: var(--header-height);
  padding: .7rem clamp(1rem, 4vw, 4rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  background: rgba(255,247,242,.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.model-brand {
  display: inline-flex;
  align-items: center;
  gap: .8rem;
  text-decoration: none;
  font-weight: 800;
}

.model-brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1.5px solid var(--ink);
  font-size: .82rem;
}

.model-header nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.8rem);
}

.model-header nav a {
  text-decoration: none;
  font-size: .82rem;
  font-weight: 800;
  border-bottom: 2px solid transparent;
  transition: border-color .2s ease, color .2s ease;
}

.model-header nav a:hover,
.model-header nav a:focus-visible {
  color: var(--coral);
  border-color: var(--coral);
}

.model-hero {
  position: relative;
  min-height: calc(100dvh - var(--header-height));
  padding: clamp(2.5rem, 5vw, 5rem) clamp(1.5rem, 7vw, 7rem);
  display: grid;
  grid-template-columns: minmax(56px,.18fr) 1.15fr .9fr;
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
  overflow: hidden;
  background: var(--coral);
}

.model-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .22;
  background: repeating-linear-gradient(135deg, transparent 0 38px, rgba(255,253,249,.3) 38px 76px);
  clip-path: polygon(0 0, 52% 0, 35% 100%, 0 100%);
}

.hero-vertical {
  position: relative;
  z-index: 1;
  justify-self: center;
  writing-mode: vertical-rl;
  color: var(--white);
  font-size: clamp(.9rem, 1.4vw, 1.2rem);
  font-weight: 800;
  letter-spacing: .12em;
}

.hero-book {
  position: relative;
  z-index: 1;
  transform: rotate(-2deg);
}

.hero-book::after {
  content: "";
  position: absolute;
  inset: 10% -5% -6% 8%;
  z-index: -1;
  background: var(--yellow);
  clip-path: polygon(8% 0, 100% 6%, 92% 100%, 0 92%);
}

.hero-book img {
  width: 100%;
  border: 10px solid var(--white);
  box-shadow: 0 28px 70px rgba(98,45,34,.2);
}

.hero-message {
  position: relative;
  z-index: 2;
  color: var(--white);
}

.hero-label {
  width: fit-content;
  margin: 0 0 1rem;
  padding: .2rem .7rem;
  color: var(--ink);
  background: var(--yellow);
  font-size: .82rem;
  font-weight: 800;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.hero-message h1 {
  margin-bottom: 1.5rem;
  font-size: clamp(3rem, 5.2vw, 5.6rem);
}

.hero-message h1 span { color: var(--yellow); }
.hero-message > p:not(.hero-label) { max-width: 31rem; margin-bottom: 2rem; }

.model-button {
  min-height: 58px;
  padding: .9rem 1.8rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  background: var(--ink);
  text-decoration: none;
  font-weight: 800;
  clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  transition: transform .2s ease, background-color .2s ease;
}

.model-button:hover,
.model-button:focus-visible { background: #3a271a; transform: translateY(-2px); }
.model-button:active { transform: translateY(1px); }

.hero-stamp {
  position: absolute;
  right: 2.5vw;
  top: 4vh;
  z-index: 2;
  min-width: 180px;
  padding: .8rem 1.1rem;
  display: flex;
  align-items: center;
  gap: .8rem;
  color: var(--ink);
  background: var(--yellow);
  transform: rotate(2deg);
}

.hero-stamp strong { font-size: 3.6rem; line-height: 1; }
.hero-stamp span { font-weight: 800; line-height: 1.4; }

.section-nav {
  position: sticky;
  top: var(--header-height);
  z-index: 20;
  padding: 0 clamp(1rem, 7vw, 7rem);
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 1rem;
  background: var(--yellow);
}

.section-nav a {
  min-height: 70px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--ink);
  text-decoration: none;
  font-weight: 800;
  clip-path: polygon(14px 0, calc(100% - 14px) 0, 100% 50%, calc(100% - 14px) 100%, 14px 100%, 0 50%);
}

.intro-section {
  min-height: 82vh;
  padding: clamp(5rem, 9vw, 9rem) clamp(1.5rem, 8vw, 8rem);
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  align-items: center;
  gap: clamp(3rem, 7vw, 7rem);
  background: var(--white);
}

.small-heading {
  color: var(--coral);
  font-weight: 800;
}

.intro-copy h2,
.receive-lead h2,
.message-copy h2 {
  font-size: clamp(2.6rem, 5vw, 5.2rem);
}

.intro-copy h2 span,
.receive-lead h2 span { color: var(--coral); }
.intro-copy > p:last-child { max-width: 34rem; color: var(--ink-soft); }

.intro-visual { margin: 0; }
.intro-visual img { width: 100%; box-shadow: 16px 18px 0 var(--peach); }

.stripe-heading {
  min-height: 245px;
  padding: 3.5rem 1.5rem;
  display: grid;
  place-content: center;
  text-align: center;
  color: var(--coral);
  background: repeating-linear-gradient(135deg, var(--paper) 0 42px, var(--peach) 42px 84px);
}

.stripe-heading p { margin: 0 0 .4rem; font-weight: 800; }
.stripe-heading h2 { margin: 0; font-size: clamp(2.4rem, 4.5vw, 4.5rem); }

.feature {
  min-height: 100dvh;
  padding: clamp(5rem, 9vw, 9rem) clamp(1.5rem, 8vw, 8rem);
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  align-items: center;
  gap: clamp(3rem, 7vw, 8rem);
  overflow: hidden;
}

.feature-one { background: var(--paper-soft); }
.feature-two { background: var(--paper-deep); }
.feature-three { color: var(--white); background: var(--coral); }

.feature-title-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.6rem;
  align-items: start;
}

.feature-title-row > div > p { margin: 0 0 .5rem; color: var(--coral); font-weight: 800; }
.feature-three .feature-title-row > div > p { color: var(--yellow); }

.feature-number {
  color: var(--coral);
  font-size: clamp(5rem, 9vw, 8.5rem);
  font-weight: 800;
  line-height: .86;
}

.feature-three .feature-number { color: var(--yellow); }

.feature h2 { margin-bottom: 1rem; font-size: clamp(2.4rem, 4.6vw, 4.7rem); }
.feature h3 { font-size: clamp(1.5rem, 2.6vw, 2.5rem); }
.feature-description { max-width: 38rem; color: var(--ink-soft); font-size: 1.05rem; }
.feature-three .feature-description { color: rgba(255,253,249,.88); }

.feature-note {
  max-width: 36rem;
  margin-top: 2rem;
  padding: 1.2rem 1.4rem;
  background: var(--yellow);
  clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.feature-note strong { color: var(--coral); }
.feature-note p { margin-bottom: 0; }

.feature-visual { position: relative; }
.feature-visual img { width: 100%; box-shadow: 18px 20px 0 rgba(229,95,75,.2); }
.feature-visual-poster { transform: rotate(1.5deg); }
.feature-visual-foundation img { border: 10px solid var(--white); box-shadow: 18px 20px 0 var(--yellow); }

.audio-stage {
  position: relative;
  min-height: 570px;
  padding: 4rem 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--white);
  clip-path: polygon(6% 0, 100% 5%, 94% 100%, 0 94%);
}

.audio-disc {
  width: min(320px,80%);
  aspect-ratio: 1;
  display: grid;
  place-content: center;
  text-align: center;
  background: var(--peach);
  border: 2px dashed var(--coral-soft);
  border-radius: 50%;
}

.audio-disc span { font-weight: 800; }
.audio-disc strong { color: var(--coral); font-size: clamp(4.5rem, 8vw, 7rem); line-height: 1; }

.audio-days {
  width: 100%;
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(5,1fr);
  gap: .3rem;
}

.audio-days span {
  padding: .55rem .2rem;
  text-align: center;
  color: var(--white);
  background: var(--coral);
  font-size: .7rem;
  font-weight: 800;
}

.audio-stage > p { margin: 1.4rem 0 0; font-weight: 800; }

.stripe-heading-dark {
  color: var(--ink);
  background: repeating-linear-gradient(135deg, var(--yellow) 0 42px, #f7db7f 42px 84px);
}

.receive-section {
  padding: clamp(5rem, 9vw, 9rem) clamp(1.5rem, 8vw, 8rem);
  color: var(--white);
  background: var(--coral);
}

.receive-lead { max-width: var(--max); margin: 0 auto 4rem; }
.receive-lead > p:first-child { color: var(--yellow); font-weight: 800; }
.receive-lead h2 span { color: var(--yellow); }

.receive-steps {
  max-width: var(--max);
  margin: auto;
  display: grid;
  gap: 1.2rem;
}

.receive-steps article {
  min-height: 160px;
  padding: 2rem 3rem;
  display: grid;
  grid-template-columns: 100px .7fr 1fr;
  align-items: center;
  gap: 2rem;
  color: var(--ink);
  background: var(--white);
  clip-path: polygon(18px 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
}

.receive-steps article span { color: var(--coral); font-size: 3.5rem; font-weight: 800; }
.receive-steps article h3 { margin: 0; font-size: 1.5rem; }
.receive-steps article p { margin: 0; color: var(--ink-soft); }

.receive-action { margin-top: 4rem; text-align: center; }
.model-button-light { color: var(--ink); background: var(--yellow); }
.model-button-light:hover, .model-button-light:focus-visible { background: #ffe996; }
.form-status { min-height: 1.8em; margin: .8rem 0 0; font-size: .82rem; }

.message-section {
  position: relative;
  min-height: 82vh;
  padding: clamp(5rem, 9vw, 9rem) clamp(1.5rem, 12vw, 12rem);
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--paper-soft);
}

.message-copy { position: relative; z-index: 2; max-width: 700px; }
.message-copy > p:not(.small-heading):not(.signature) { color: var(--ink-soft); }
.signature { margin-top: 2rem; font-size: 1.2rem; font-weight: 800; }

.message-mark {
  position: absolute;
  right: 7vw;
  top: 50%;
  transform: translateY(-50%) rotate(8deg);
  color: var(--peach);
  font-size: min(42vw,520px);
  font-weight: 800;
  line-height: 1;
}

.side-cta {
  position: fixed;
  right: 0;
  top: 50%;
  z-index: 25;
  width: 76px;
  padding: 1.1rem .7rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  color: var(--white);
  background: var(--ink);
  text-decoration: none;
  clip-path: polygon(16px 0, 100% 0, 100% 100%, 16px 100%, 0 50%);
}

.side-cta span { font-size: .68rem; }
.side-cta strong { writing-mode: vertical-rl; letter-spacing: .08em; }

footer {
  padding: 3rem clamp(1.5rem, 6vw, 6rem);
  display: grid;
  grid-template-columns: .65fr 1.7fr auto;
  gap: 2rem;
  align-items: start;
  color: var(--ink-soft);
  background: var(--white);
  border-top: 1px solid var(--line);
  font-size: .75rem;
}

footer p { margin-top: 0; }
.footer-notes p { margin-bottom: .25rem; }

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s ease, transform .7s ease;
}

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

@media (max-width: 980px) {
  :root { --header-height: 64px; }
  .model-header nav { display: none; }
  .model-hero { grid-template-columns: 42px 1fr; }
  .hero-book { grid-column: 2; }
  .hero-message { grid-column: 2; }
  .hero-stamp { right: 1rem; top: 1.5rem; transform: scale(.8) rotate(2deg); transform-origin: top right; }
  .intro-section, .feature { grid-template-columns: 1fr; min-height: auto; }
  .feature-visual, .audio-stage { max-width: 760px; }
  .receive-steps article { grid-template-columns: 76px 1fr; }
  .receive-steps article p { grid-column: 2; }
  footer { grid-template-columns: 1fr; }
}

@media (max-width: 650px) {
  .model-header { min-height: 60px; }
  .model-brand { font-size: .8rem; }
  .model-brand-mark { width: 32px; height: 32px; }
  .model-hero { min-height: auto; padding: 4rem 1.25rem 3.5rem; grid-template-columns: 1fr; }
  .model-hero::before { clip-path: polygon(0 0, 100% 0, 100% 34%, 0 58%); }
  .hero-vertical { display: none; }
  .hero-book, .hero-message { grid-column: 1; }
  .hero-book { margin-top: 3rem; }
  .hero-message { text-align: center; }
  .hero-label { margin-inline: auto; }
  .hero-message h1 { font-size: clamp(2.8rem, 12vw, 4rem); }
  .hero-stamp { min-width: 138px; padding: .5rem .8rem; }
  .hero-stamp strong { font-size: 2.7rem; }
  .hero-stamp span { font-size: .75rem; }
  .section-nav { position: static; padding: .8rem; grid-template-columns: 1fr; gap: .45rem; }
  .section-nav a { min-height: 52px; }
  .intro-section, .feature, .receive-section, .message-section { padding: 5rem 1.25rem; }
  .intro-section { min-height: auto; }
  .intro-copy h2, .receive-lead h2, .message-copy h2 { font-size: clamp(2.4rem, 11vw, 3.4rem); }
  .stripe-heading { min-height: 200px; background-size: auto; }
  .stripe-heading h2 { font-size: 2.25rem; }
  .feature-title-row { grid-template-columns: 1fr; gap: .8rem; }
  .feature-number { font-size: 5rem; }
  .feature h2 { font-size: clamp(2.2rem, 10vw, 3.2rem); }
  .feature h3 { font-size: 1.45rem; }
  .audio-stage { min-height: 430px; padding: 3rem 1.2rem; }
  .audio-days { grid-template-columns: repeat(5,minmax(0,1fr)); }
  .audio-days span { font-size: .56rem; }
  .receive-steps article { padding: 1.5rem; grid-template-columns: 58px 1fr; gap: 1rem; }
  .receive-steps article span { font-size: 2.6rem; }
  .receive-steps article h3 { font-size: 1.25rem; }
  .side-cta { display: none; }
  .message-mark { right: -7vw; font-size: 70vw; }
  .model-button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .model-button { transition: none; }
}

@media (prefers-reduced-transparency: reduce) {
  .model-header { background: var(--paper); backdrop-filter: none; }
}