:root {
  --ink: #3d2c24;
  --quiet: #6a5348;
  --paper: #f4ead8;
  --pencil: #7a6458;
  --mark: #e8c45a;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    repeating-linear-gradient(
      transparent 0 31px,
      rgba(61, 44, 36, 0.07) 31px 32px
    ),
    var(--paper);
  color: var(--ink);
  font-family: "Hiragino Maru Gothic ProN", "Yu Gothic", "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", sans-serif;
}

.page {
  position: relative;
  max-width: 420px;
  margin: 0 auto;
  padding: 2.4rem 1rem 2.2rem 3.4rem;
}

.margin-scribble {
  position: absolute;
  left: 0.35rem;
  top: 1.8rem;
  width: 32px;
  height: min(68vh, 28rem);
  color: var(--pencil);
  opacity: 0.55;
  pointer-events: none;
}

.mast {
  transform: rotate(-1.6deg);
  transform-origin: left center;
}

.mast-kana {
  margin: 0;
  font-size: 13px;
  color: var(--pencil);
}

.mast-kana span {
  font-size: 11px;
  text-decoration: line-through;
  opacity: 0.7;
}

.mast h1 {
  margin: 0.2rem 0 0;
  font-size: clamp(1.45rem, 7vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.25;
}

.title-underline {
  display: block;
  width: min(16rem, 88%);
  height: 16px;
  margin: 0.1rem 0 0.4rem;
  color: var(--ink);
}

.lede {
  margin: 0.2rem 0 0;
  color: var(--quiet);
  font-size: 0.98rem;
  line-height: 1.7;
}

.section-label {
  margin: 2.6rem 0 0.8rem;
  font-size: 13px;
  color: var(--pencil);
  transform: rotate(1.1deg);
}

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

.experiment {
  position: relative;
  display: grid;
  gap: 0.15rem;
  padding: 1.15rem 1.15rem 1.05rem 1.25rem;
  color: inherit;
  text-decoration: none;
  transform: rotate(0.7deg);
}

.frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  color: var(--ink);
  pointer-events: none;
}

.experiment-kind {
  position: relative;
  font-size: 12px;
  color: var(--quiet);
}

.experiment-title {
  position: relative;
  display: inline-block;
  width: fit-content;
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  background: linear-gradient(transparent 62%, var(--mark) 62% 92%, transparent 92%);
}

.experiment-note {
  position: relative;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--quiet);
}

.experiment-arrow {
  position: relative;
  margin-top: 0.15rem;
  font-size: 13px;
  color: var(--ink);
}

.experiment:hover,
.experiment:focus-visible {
  transform: rotate(-0.4deg);
}

.experiment:hover .experiment-arrow,
.experiment:focus-visible .experiment-arrow {
  transform: translateX(4px);
}

footer {
  margin-top: 2.4rem;
  transform: rotate(-0.8deg);
}

footer p {
  margin: 0;
  font-size: 13px;
  color: var(--pencil);
}

@media (max-width: 430px) {
  .page {
    padding: 1.5rem 0.85rem 1.8rem 2.5rem;
  }

  .margin-scribble {
    width: 24px;
    left: 0.15rem;
  }

  .experiment {
    padding: 0.95rem 0.85rem 0.9rem 1rem;
  }

  .experiment-title {
    font-size: 1.12rem;
  }
}