:root {
  color-scheme: light;
  --washi: #f5efdf;
  --washi-light: #fffaf2;
  --ink: #1e1a16;
  --ink-soft: #514a40;
  --ink-muted: #6d6253;
  --line: rgba(30, 26, 22, 0.22);
  --line-strong: rgba(30, 26, 22, 0.52);
  --vermilion: #b63b2a;
  --vermilion-deep: #8f281d;
  --indigo: #183a60;
  --serif: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--washi);
}

body {
  margin: 0;
  background-color: var(--washi);
  background-image: url("/assets/washi-paper-v1.jpg");
  background-position: center top;
  background-size: 1024px auto;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--indigo);
}

img {
  display: block;
  max-width: 100%;
}

:focus-visible {
  outline: 3px solid var(--indigo);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 20;
  padding: 10px 14px;
  border: 1px solid var(--ink);
  background: var(--washi-light);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.utility-shell {
  width: min(100% - 36px, 820px);
  margin-inline: auto;
}

.utility-header {
  border-bottom: 1px solid var(--line);
  background: rgba(245, 239, 223, 0.94);
  backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
}

.utility-brand {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.16rem;
  font-weight: 800;
  gap: 10px;
  text-decoration: none;
}

.utility-brand img {
  width: 38px;
  height: 38px;
  border-radius: 9px;
}

.header-link {
  color: var(--vermilion-deep);
  font-size: 0.8rem;
  font-weight: 700;
  text-underline-offset: 4px;
}

.support-main {
  padding-block: 66px 86px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--vermilion-deep);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  font-family: var(--serif);
  line-height: 1.32;
}

h1 {
  font-size: clamp(2.8rem, 13vw, 5rem);
}

.lead {
  max-width: 40rem;
  margin: 22px 0 58px;
  color: var(--ink-soft);
}

.support-section {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  padding-block: 30px 34px;
  border-top: 1px solid var(--line-strong);
  gap: 10px;
}

.support-section:last-of-type {
  border-bottom: 1px solid var(--line-strong);
}

.section-number {
  margin: 0;
  color: var(--vermilion);
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 800;
}

.support-section h2,
.english-support h2 {
  font-size: clamp(1.45rem, 6vw, 2.2rem);
}

.support-section p,
.english-support p {
  color: var(--ink-soft);
}

.utility-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  margin-top: 16px;
  padding: 0 22px 1px;
  border: 1px solid var(--vermilion-deep);
  border-radius: 6px;
  background: var(--vermilion);
  color: #fff;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  box-shadow: 4px 4px 0 rgba(143, 40, 29, 0.2);
}

.utility-button:hover {
  background: var(--vermilion-deep);
}

.link-list {
  margin: 14px 0 0;
  padding-left: 1.25rem;
}

.link-list a,
.support-section a,
.english-support a {
  text-underline-offset: 4px;
}

.english-support {
  margin-top: 72px;
  padding: 36px 0;
  border-top: 6px solid var(--indigo);
}

.utility-footer {
  border-top: 1px solid var(--line-strong);
  background: var(--ink);
  color: var(--washi-light);
}

.utility-footer .utility-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  gap: 20px;
}

.utility-footer a {
  color: var(--washi-light);
}

.utility-footer p {
  margin: 0;
  color: #c6bdaf;
  font-size: 0.76rem;
}

.error-page {
  min-height: 100svh;
}

.error-main {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 100svh;
  padding-block: 72px;
  flex-direction: column;
}

.error-main > img {
  width: 76px;
  height: 76px;
  margin-bottom: 30px;
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(30, 26, 22, 0.18);
}

.error-code {
  margin: 0 0 8px;
  color: var(--vermilion-deep);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.error-main h1 {
  max-width: 10em;
  font-size: clamp(2.4rem, 11vw, 4.6rem);
}

.error-main > p:not(.error-code) {
  margin: 22px 0 0;
  color: var(--ink-soft);
}

.error-main nav {
  display: flex;
  align-items: flex-start;
  margin-top: 24px;
  flex-direction: column;
  gap: 18px;
}

.error-main .text-link {
  font-weight: 700;
}

@media (min-width: 640px) {
  .utility-shell {
    width: min(100% - 64px, 820px);
  }

  .support-main {
    padding-block: 92px 116px;
  }

  .support-section {
    grid-template-columns: 72px minmax(0, 1fr);
    padding-block: 42px 48px;
    gap: 18px;
  }

  .error-main nav {
    align-items: center;
    flex-direction: row;
    gap: 24px;
  }
}

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

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