:root {
  --ink: #071323;
  --paper: #f5f0e6;
  --lime: #dfff35;
  --red: #e43a25;
  --serif: "Noto Serif JP", "Yu Mincho", serif;
  --sans: "Noto Sans JP", sans-serif;
  --gutter: clamp(24px, 6vw, 92px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--ink); color: var(--paper); font-family: var(--sans); }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { color: inherit; }
img { display: block; width: 100%; }

.site-header {
  position: absolute; inset: 0 0 auto; z-index: 20; height: 108px; display: flex; align-items: center;
  padding: 0 var(--gutter); gap: 44px;
}
.logo { font: 500 25px/1 var(--serif); letter-spacing: .34em; }
.desktop-nav { margin-left: auto; display: flex; gap: 42px; font-family: var(--serif); }
.desktop-nav a, footer nav a { transition: opacity .2s; }
.desktop-nav a:hover, footer nav a:hover { opacity: .6; }
.header-cta { background: var(--lime); color: var(--ink); padding: 15px 30px 17px; border-radius: 100px; font-weight: 600; }
.menu-button, .mobile-nav { display: none; }

.hero { min-height: min(920px, 92svh); display: grid; grid-template-columns: 1fr 1fr; align-items: center; padding: 130px var(--gutter) 68px; overflow: hidden; }
.hero-copy { position: relative; z-index: 2; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 30px; font: 500 clamp(54px, 5.7vw, 88px)/1.34 var(--serif); letter-spacing: -.06em; }
.hero-copy > p { font: 400 clamp(17px, 1.5vw, 23px)/2 var(--serif); letter-spacing: .04em; }
.hero-actions { margin-top: 40px; display: flex; flex-direction: column; align-items: flex-start; gap: 16px; }
.button { border: 0; cursor: pointer; display: inline-flex; justify-content: space-between; align-items: center; gap: 42px; min-width: 310px; padding: 20px 28px; font-weight: 600; transition: background .25s, color .25s, transform .25s; }
.button:hover { transform: translateY(-2px); }
.button-lime { background: var(--lime); color: var(--ink); }
.button-lime:hover { background: var(--paper); }
.note { font-size: 12px; opacity: .55; margin-left: 10px; }
.text-link { margin: 10px 0 0 10px; font-family: var(--serif); border-bottom: 1px solid; padding-bottom: 6px; }
.hero-visual { margin: 0 -10vw 0 -6vw; animation: float 6s ease-in-out infinite; }
.hero-visual img { mix-blend-mode: screen; }

.paper-section { background: var(--paper); color: var(--ink); }
.about { padding: clamp(90px, 11vw, 165px) var(--gutter) clamp(80px, 9vw, 135px); }
.section-head { display: block; margin-bottom: 90px; }
.section-head h2, .mood h2, .how h2, .price h2 { margin: 0; font: 500 clamp(46px, 5.6vw, 88px)/1.28 var(--serif); letter-spacing: -.06em; }
.section-head h2 { white-space: nowrap; font-size: clamp(46px, 5.2vw, 80px); }
.section-head p { font: 400 clamp(15px, 1.35vw, 20px)/2.1 var(--serif); margin: 22px 0 0; }
.principles { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid rgba(7,19,35,.55); }
.principles li { display: grid; grid-template-columns: auto 1fr; gap: 26px; padding: 34px 26px 0 0; }
.principles li + li { border-left: 1px solid rgba(7,19,35,.18); padding-left: 34px; }
.principles li > span { font: 400 clamp(65px, 7vw, 112px)/.9 var(--serif); letter-spacing: -.08em; }
.principles h3, .steps h3 { font: 500 clamp(19px, 2vw, 29px)/1.5 var(--serif); margin: 0 0 10px; }
.principles p, .steps p { font: 400 14px/1.9 var(--serif); margin: 0; }

.mood { min-height: 790px; display: grid; grid-template-columns: .8fr 1.2fr; gap: 5vw; align-items: center; padding: 80px var(--gutter); background: var(--lime); color: var(--ink); overflow: hidden; }
.mood h2 { margin-bottom: 36px; }
.mood-options { border-top: 1px solid rgba(7,19,35,.6); }
.mood-option { width: 100%; appearance: none; border: 0; border-bottom: 1px solid rgba(7,19,35,.6); background: transparent; padding: 18px 26px; display: flex; justify-content: space-between; cursor: pointer; font: 500 20px/1.5 var(--serif); text-align: left; transition: .25s; }
.mood-option:hover, .mood-option.active { background: var(--ink); color: var(--paper); padding-left: 32px; }
.mood-visual { margin: 0 -8vw 0 0; }

.how { min-height: 820px; padding: clamp(90px, 10vw, 150px) var(--gutter); display: grid; grid-template-columns: 1.05fr .95fr; gap: 7vw; align-items: center; overflow: hidden; }
.how h2 { margin-bottom: 54px; width: 160%; white-space: nowrap; position: relative; z-index: 2; }
.steps { padding: 0; margin: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 86px 1fr; gap: 30px; padding: 22px 0; }
.steps li > span { color: var(--lime); font: 400 36px/1.4 var(--serif); border-right: 1px solid rgba(245,240,230,.6); }
.steps p { color: rgba(245,240,230,.68); }
.book-line svg { width: 100%; max-height: 560px; stroke: var(--paper); stroke-width: 1.25; }
.trace { stroke-dasharray: 1100; stroke-dashoffset: 1100; transition: stroke-dashoffset 2s ease; }
.book-line.visible .trace { stroke-dashoffset: 0; }

.price { min-height: 520px; padding: 95px var(--gutter); display: grid; grid-template-columns: 1fr 1fr; align-items: center; }
.price-copy { padding-right: 6vw; }
.price-copy p { font: 400 clamp(17px, 1.7vw, 25px)/1.8 var(--serif); margin-top: 28px; }
.price-offer { border-left: 1px solid rgba(7,19,35,.45); padding-left: 6vw; display: flex; flex-direction: column; align-items: stretch; }
.price-line { display: flex; align-items: baseline; justify-content: center; font-family: var(--serif); }
.price-line strong { font-size: clamp(110px, 13vw, 190px); line-height: .9; font-weight: 400; letter-spacing: -.08em; }
.price-line span { font-size: clamp(23px, 2.2vw, 34px); }
.signup-button { width: 100%; margin-top: 36px; }
.price-offer small { opacity: .6; text-align: center; margin-top: 14px; }

footer { min-height: 110px; padding: 0 var(--gutter); display: flex; align-items: center; gap: 38px; }
.footer-rule { height: 1px; background: rgba(245,240,230,.35); flex: 1; }
footer nav { display: flex; gap: 32px; font: 400 14px/1 var(--serif); }
footer small { padding-left: 30px; border-left: 1px solid rgba(245,240,230,.5); white-space: nowrap; }

.signup-dialog { width: min(560px, calc(100% - 32px)); border: 0; background: var(--paper); color: var(--ink); padding: 56px; box-shadow: 0 25px 90px rgba(0,0,0,.4); }
.signup-dialog::backdrop { background: rgba(7,19,35,.82); }
.signup-dialog h2 { font: 500 34px/1.5 var(--serif); }
.signup-dialog > p { font: 400 15px/1.5 var(--serif); }
.dialog-close { position: absolute; top: 16px; right: 20px; background: none; border: 0; font-size: 28px; cursor: pointer; }
.signup-dialog label { display: grid; gap: 9px; margin: 26px 0 16px; font-size: 13px; }
.signup-dialog input { border: 1px solid rgba(7,19,35,.35); background: transparent; padding: 16px; font-size: 16px; }
.signup-dialog .button { width: 100%; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s ease, transform .8s ease; }
.reveal.visible { opacity: 1; transform: none; }
.mobile-only { display: none; }
@keyframes float { 50% { transform: translateY(-16px) rotate(.5deg); } }

@media (max-width: 900px) {
  .site-header { height: 82px; }
  .desktop-nav, .header-cta { display: none; }
  .menu-button { display: block; position: absolute; right: var(--gutter); border: 0; background: transparent; font-size: 12px; letter-spacing: .14em; }
  .mobile-nav { position: absolute; top: 70px; right: var(--gutter); display: none; flex-direction: column; background: var(--paper); color: var(--ink); padding: 22px 30px; gap: 18px; box-shadow: 0 18px 44px rgba(0,0,0,.25); }
  .mobile-nav.open { display: flex; }
  .hero { grid-template-columns: 1fr; padding-top: 130px; }
  .hero-copy { padding-bottom: 10px; }
  .hero-visual { margin: -20px -30vw 0 4vw; }
  .section-head, .price { grid-template-columns: 1fr; }
  .section-head { gap: 35px; }
  .section-head h2, .how h2 { width: auto; white-space: normal; }
  .principles { grid-template-columns: 1fr; }
  .principles li, .principles li + li { border-left: 0; border-bottom: 1px solid rgba(7,19,35,.18); padding: 28px 0; grid-template-columns: 100px 1fr; }
  .mood { grid-template-columns: 1fr; padding-top: 100px; }
  .mood-visual { margin: 10px -30vw -20px 5vw; }
  .how { grid-template-columns: 1fr; }
  .book-line { max-width: 560px; margin: -70px auto -100px; }
  .price { gap: 60px; }
  .price-copy { padding: 0; }
  .price-offer { padding: 50px 0 0; border-left: 0; border-top: 1px solid rgba(7,19,35,.45); }
  footer { padding-top: 34px; padding-bottom: 34px; flex-wrap: wrap; }
  .footer-rule { order: 2; width: 100%; flex-basis: 100%; }
  footer nav { order: 3; flex-wrap: wrap; }
  footer small { order: 4; margin-left: auto; }
}

@media (max-width: 560px) {
  .logo { font-size: 18px; }
  .hero { min-height: auto; padding-bottom: 40px; }
  h1 { font-size: 49px; }
  .hero-copy > p { font-size: 15px; }
  .button { min-width: 0; width: 100%; }
  .hero-visual { margin: 12px -38vw -10px -5vw; }
  .about { border-radius: 22px 22px 0 0; }
  .mobile-only { display: block; }
  .section-head p br:not(.mobile-only) { display: none; }
  .principles li, .principles li + li { grid-template-columns: 80px 1fr; gap: 16px; }
  .principles li > span { font-size: 58px; }
  .mood { min-height: auto; }
  .mood h2, .section-head h2, .how h2, .price h2 { font-size: 45px; }
  .mood-option { font-size: 17px; padding-inline: 18px; }
  .mood-visual { margin: 20px -45vw -10px -9vw; }
  .how { min-height: auto; padding-bottom: 60px; }
  .steps li { grid-template-columns: 56px 1fr; gap: 18px; }
  .steps li > span { font-size: 27px; }
  .steps h3 { font-size: 18px; }
  .book-line { margin: -40px -30px -70px; }
  .price { min-height: auto; padding-top: 80px; padding-bottom: 80px; }
  .price-line strong { font-size: 110px; }
  footer nav { gap: 20px; }
  footer small { padding: 0; border: 0; }
  .signup-dialog { padding: 44px 24px 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}