:root {
  --paper: #fbf7ef;
  --paper-2: #f3ecdd;
  --ink: #3b3633;
  --ink-soft: #6b625c;
  --ink-faint: #a0968e;
  --line: #d9cfbf;
  --marker: #ffe08a;
  --marker-2: #ffd1b3;
  --link: #3f7f7c;
  --link-hover: #2c5f5d;
  --red: #d76c5b;
  --hand: 'Klee One', 'Zen Maru Gothic', sans-serif;
  --body: 'Zen Maru Gothic', 'Hiragino Maru Gothic ProN', 'Yu Gothic', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);

  background-image:
    radial-gradient(rgba(0,0,0,.035) 1px, transparent 1px),
    radial-gradient(rgba(0,0,0,.025) 1px, transparent 1px);
  background-size: 7px 7px, 11px 11px;
  background-position: 0 0, 3px 5px;
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { color: var(--link-hover); }
img { max-width: 100%; height: auto; display: block; }
p { margin: 0 0 1em; }
small { display: block; font-size: .86em; color: var(--ink-soft); line-height: 1.7; margin-top: .2em; }

main { max-width: 760px; margin: 0 auto; padding: 0 20px 60px; }
section { margin: 0 0 84px; scroll-margin-top: 120px; }

h2 { font-family: var(--hand); font-weight: 600; font-size: 1.55rem; margin: 0 0 22px; letter-spacing: .04em; }
mark {
  background: none;
  color: inherit;
  background-image: linear-gradient(transparent 58%, var(--marker) 58%, var(--marker) 92%, transparent 92%);
  padding: 0 .1em;
}

.top {
  max-width: 760px; margin: 0 auto; padding: 18px 20px 12px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;

  position: sticky; top: 0; z-index: 20; background: var(--paper);
}
.logo { font-family: var(--hand); font-weight: 600; font-size: 1.35rem; color: var(--ink); text-decoration: none; letter-spacing: .06em; }
.logo span { color: var(--red); }
.top-note { font-size: .86rem; color: var(--ink-soft); margin: 0; }

.menu { position: relative; margin-left: auto; }
.menu summary {
  list-style: none; cursor: pointer; user-select: none;
  display: inline-flex; align-items: center; gap: 9px; padding: 6px 8px; border-radius: 8px;
}
.menu summary::-webkit-details-marker { display: none; }
.menu summary:hover, .menu[open] summary { background: var(--paper-2); }
.menu-label { font-family: var(--hand); font-weight: 600; font-size: .95rem; }
.bars { display: block; width: 24px; }
.bars i {
  display: block; height: 2px; margin: 5px 0; background: var(--ink); border-radius: 2px;
  transition: transform .18s ease, opacity .18s ease, width .18s ease;
}

.bars i:nth-child(1) { width: 24px; transform: rotate(-2deg); }
.bars i:nth-child(2) { width: 20px; }
.bars i:nth-child(3) { width: 22px; transform: rotate(1.5deg); }
.menu[open] .bars i:nth-child(1) { transform: translateY(7px) rotate(44deg); width: 24px; }
.menu[open] .bars i:nth-child(2) { opacity: 0; }
.menu[open] .bars i:nth-child(3) { transform: translateY(-7px) rotate(-46deg); width: 24px; }
.menu nav {
  position: absolute; right: 0; top: calc(100% + 10px); min-width: 230px;
  padding: 8px 6px;
  background: #fff9ea;
  border: 2px solid var(--ink);
  border-radius: 12px 16px 10px 18px / 18px 10px 16px 12px;
  box-shadow: 3px 4px 0 rgba(59,54,51,.12);
  transform: rotate(-.6deg);
}
.menu nav a {
  display: block; padding: 10px 14px; color: var(--ink); text-decoration: none;
  font-family: var(--hand); font-weight: 600; font-size: 1rem;
  border-bottom: 1px dashed var(--line);
}
.menu nav a:last-child { border-bottom: none; }
.menu nav a:hover { background-image: linear-gradient(transparent 58%, var(--marker) 58%, var(--marker) 92%, transparent 92%); }

@media (min-width: 721px) {
  .menu { width: 100%; order: 3; margin-left: 0; }
  .menu summary { display: none; }
  .menu nav {
    position: static; display: flex; flex-wrap: wrap; gap: 2px 14px; min-width: 0;
    padding: 6px 0 0; background: none; border: 0; border-top: 1px dashed var(--line);
    border-radius: 0; box-shadow: none; transform: none;
  }
  .menu nav a { padding: 6px 1px; border-bottom: 0; font-size: .9rem; }
  .menu nav a:last-child { margin-left: auto; color: var(--link); }
  .menu nav .handle { display: none; }
}

.hero {
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 24px; align-items: end;
  padding-top: 56px; margin-bottom: 96px;
}
.hero .pre { display: block; font-family: var(--hand); font-weight: 400; font-size: 1.25rem; margin: 0 0 4px; color: var(--ink-soft); letter-spacing: .02em; }
.hero h1 {
  font-family: var(--hand); font-weight: 600; font-size: clamp(2.2rem, 6vw, 3.2rem);
  line-height: 1.25; margin: 0 0 22px; letter-spacing: .03em;
}
.lede { font-size: 1.02rem; margin-bottom: 30px; }
.pc { display: inline; }

.go {
  display: inline-block; font-family: var(--hand); font-weight: 600; font-size: 1.1rem;
  color: var(--ink); text-decoration: none; padding: 10px 22px 12px;
  border: 2px solid var(--ink); border-radius: 999px 999px 999px 999px / 90px 60px 90px 60px;
  background: var(--paper);
  transition: transform .12s ease, background .2s;
}
.go:hover { background: var(--marker); transform: rotate(-1.5deg); }

.hero-pic { position: relative; height: 320px; }
.hero-pic img { position: absolute; bottom: 0; width: auto; }
.hero-pic .p1 { height: 300px; left: 6%; transform: rotate(-2deg); }
.hero-pic .p2 { height: 290px; left: 40%; transform: rotate(1.5deg); z-index: 2; }
.hero-pic .p3 { height: 250px; right: 0; transform: rotate(3deg); opacity: .95; }

.about p { max-width: 60ch; }

.how { position: relative; }
.how dl { margin: 0; max-width: 58ch; }
.how dl > div { display: grid; grid-template-columns: 92px 1fr; gap: 12px; padding: 16px 0; border-bottom: 1px dashed var(--line); }
.how dl > div:last-child { border-bottom: none; }
.how dt { font-family: var(--hand); font-weight: 600; font-size: 1.05rem; color: var(--ink-soft); padding-top: 3px; }
.how dd { margin: 0; }

.who { position: relative; }
.check { list-style: none; padding: 0; margin: 0 0 20px; max-width: 48ch; }
.check li { position: relative; padding: 6px 0 6px 34px; }
.check li::before {
  content: ''; position: absolute; left: 4px; top: 12px; width: 16px; height: 16px;
  border: 2px solid var(--ink-soft); border-radius: 4px 5px 4px 6px;
}
.check li::after {

  content: ''; position: absolute; left: 9px; top: 11px; width: 7px; height: 13px;
  border-right: 2.5px solid var(--red); border-bottom: 2.5px solid var(--red);
  transform: rotate(42deg);
}
.check li:nth-child(2n)::after { transform: rotate(38deg) translate(1px, -1px); }
.check li:nth-child(3n)::after { transform: rotate(46deg) translate(-1px, 0); }
.who-note { max-width: 58ch; font-size: .95rem; color: var(--ink-soft); }
.who-pics { position: absolute; right: -6px; top: 20px; display: flex; gap: 6px; align-items: flex-end; }
.who-pics img { height: 170px; width: auto; }
.who-pics img:first-child { transform: rotate(-3deg); }
.who-pics img:last-child { transform: rotate(2deg); }

.rules-lead { max-width: 58ch; margin-bottom: 14px; }
.no { list-style: none; padding: 0; margin: 0 0 18px; max-width: 54ch; }
.no li { position: relative; padding: 6px 0 6px 34px; }
.no li::before {
  content: ''; position: absolute; left: 4px; top: 12px; width: 16px; height: 16px;
  border: 2px solid var(--ink-soft); border-radius: 4px 5px 4px 6px;
}
.no li::after {

  content: '×'; position: absolute; left: 5px; top: 1px;
  font-family: var(--hand); font-weight: 600; font-size: 24px; line-height: 1; color: var(--red);
  transform: rotate(-6deg);
}
.no li:nth-child(2n)::after { transform: rotate(5deg) translate(1px, 0); }

.faq details { border-bottom: 1px dashed var(--line); padding: 4px 0; max-width: 62ch; }
.faq summary {
  cursor: pointer; font-family: var(--hand); font-weight: 600; font-size: 1.05rem;
  padding: 12px 0 12px 26px; list-style: none; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: 'Q'; position: absolute; left: 0; top: 12px; color: var(--red); font-weight: 600; }
.faq details[open] summary { color: var(--link-hover); }
.faq details p { margin: 0 0 14px 26px; color: var(--ink-soft); }

.join {
  padding: 36px 28px 30px; margin-top: 100px;
  background: #fff9ea;
  border: 2px solid var(--ink);
  border-radius: 14px 18px 12px 20px / 20px 12px 18px 14px;
  transform: rotate(.4deg);
}
.join > * { transform: rotate(-.4deg); }
.join .big { font-family: var(--hand); font-weight: 600; font-size: clamp(1.6rem, 5vw, 2.2rem); line-height: 1.4; margin-bottom: 14px; }
.contact { list-style: none; padding: 0; margin: 20px 0 10px; }
.contact li { display: flex; align-items: center; gap: 12px; padding: 8px 0; flex-wrap: wrap; }
.contact .label { font-size: .85rem; color: var(--ink-soft); min-width: 64px; }
.contact a { font-size: 1.05rem; word-break: break-all; }
.copy {
  font: inherit; font-size: .8rem; color: var(--ink-soft); background: none;
  border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; cursor: pointer;
}
.copy:hover { border-color: var(--ink-soft); color: var(--ink); }
.copy.done { color: var(--link); border-color: var(--link); }
.join .small { font-size: .86rem; color: var(--ink-soft); margin: 0; }

footer { max-width: 760px; margin: 0 auto; padding: 0 20px 48px; color: var(--ink-faint); font-size: .86rem; }
footer p { margin: 0; }
footer .tiny { font-size: .78rem; margin-top: 4px; }

@media (max-width: 720px) {
  body { font-size: 15.5px; }
  .top { padding: 12px 16px 10px; gap: 10px; }
  .top-note { order: 3; width: 100%; }
  .menu-label { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 34px; margin-bottom: 72px; }
  .pc { display: none; }
  .hero-pic { height: 210px; margin-top: 8px; }
  .hero-pic .p1 { height: 200px; left: 4%; }
  .hero-pic .p2 { height: 195px; left: 36%; }
  .hero-pic .p3 { height: 170px; right: 0; }
  .how dl > div { grid-template-columns: 72px 1fr; }
  .who-pics { position: static; justify-content: flex-end; margin-top: 8px; }
  .who-pics img { height: 130px; }
  .join { padding: 28px 20px 24px; transform: none; }
  .join > * { transform: none; }
  section { margin-bottom: 64px; scroll-margin-top: 70px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .go { transition: none; }
}