:root {
  color-scheme: light;
  --ink: #14212b;
  --muted: #51616d;
  --paper: #f4f3ee;
  --white: #fff;
  --dark: #101c29;
  --line: #d5dcd9;
  --accent: #f3d463;
  --focus: #b75500;
  font-family: -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
  line-height: 1.65;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); }
button, input { font: inherit; }
button { cursor: pointer; }
a { color: inherit; }
img { display: block; max-width: 100%; }
fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
legend { padding: 0; font-weight: 700; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.shell { width: min(100% - 40px, 1160px); margin-inline: auto; }
.skip-link { position: absolute; inset-block-start: -100px; inset-inline-start: 16px; z-index: 100; background: #fff; padding: 8px 12px; }
.skip-link:focus { inset-block-start: 12px; }

.site-header { background: var(--dark); color: #fff; border-bottom: 1px solid #31404b; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 76px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 19px; font-weight: 700; letter-spacing: -.035em; text-decoration: none; white-space: nowrap; }
.brand img { border-radius: 9px; }
.site-header nav { display: flex; align-items: center; gap: clamp(15px, 3vw, 38px); font-size: 13px; font-weight: 700; }
.site-header nav a { text-decoration: none; }
.site-header nav a:hover, .text-link:hover { text-decoration: underline; text-underline-offset: 5px; }
.nav-download { display: inline-flex; align-items: center; min-height: 44px; gap: 9px; color: var(--accent); }

.hero { overflow: clip; background: var(--dark); color: #fff; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr); gap: 5%; align-items: center; min-height: 625px; padding-block: 75px 100px; }
.eyebrow, .section-index { margin: 0 0 32px; font-size: 12px; line-height: 1.4; letter-spacing: .17em; font-weight: 700; }
.eyebrow { color: var(--accent); display: flex; align-items: center; gap: 15px; }
.eyebrow-line { width: 34px; height: 1px; background: currentColor; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1, h2 { margin: 0; letter-spacing: -.07em; line-height: 1.23; font-weight: 700; }
h1 { font-size: clamp(39px, 5.2vw, 72px); }
h1 em { font-style: normal; color: var(--accent); }
.hero-lead { max-width: 580px; margin: 30px 0 0; color: #c7d0d3; font-size: clamp(14px, 1.25vw, 16px); line-height: 2; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 25px; align-items: center; margin-block-start: 38px; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 22px; min-height: 52px; border: 0; border-radius: 4px; padding: 12px 24px; font-size: 14px; font-weight: 700; text-decoration: none; transition: transform .18s ease, background-color .18s ease; }
.button:hover:not(:disabled) { transform: translateY(-2px); }
.button-light { background: #fff; color: var(--dark); }
.button-light:hover { background: var(--accent); }
.text-link { font-size: 14px; font-weight: 700; text-decoration: none; }
.text-link span { padding-inline-start: 8px; }

.visual { min-height: 420px; position: relative; display: grid; place-items: center; isolation: isolate; }
.visual::before { content: ''; position: absolute; width: min(78%, 380px); aspect-ratio: 1; background: conic-gradient(from -36deg, #0dd0dc, #087ec9, #6b3ed5, #eb378c, #f8b83f, #0dd0dc); border-radius: 50%; filter: blur(42px); opacity: .34; z-index: -1; }
.color-orbit { position: absolute; border: 1px solid #52616a; border-radius: 50%; transform: rotate(-25deg) scaleY(.71); }
.color-orbit-outer { width: min(98%, 470px); aspect-ratio: 1; }
.color-orbit-inner { width: min(76%, 360px); aspect-ratio: 1; }
.visual-core { width: min(59%, 276px); aspect-ratio: 1; border-radius: 50%; background: conic-gradient(#00afd3 0 25%, #df358c 25% 50%, #f3ce45 50% 75%, #18232e 75% 100%); display: grid; grid-template-columns: 1fr 1fr; place-items: center; transform: rotate(-20deg); box-shadow: 0 0 70px #253944; font-size: clamp(24px, 3vw, 44px); font-weight: 700; }
.visual-core span { transform: rotate(20deg); text-shadow: 0 2px 10px #121c29aa; }
.visual-label { position: absolute; display: flex; flex-direction: column; font-size: 10px; letter-spacing: .18em; line-height: 1.5; color: #9aadb5; }
.visual-label strong { font-size: 20px; letter-spacing: 0; color: #fff; }
.visual-label-top { top: 10%; left: 5%; }
.visual-label-bottom { right: 3%; bottom: 7%; }

.section { padding-block: clamp(75px, 10vw, 145px); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12%; }
.section-index { color: #297781; }
h2 { font-size: clamp(32px, 4vw, 54px); }
.about-body { padding-block-start: 57px; color: #3b4b56; font-size: 16px; line-height: 2.05; }
.about-body p { margin-block: 0 22px; }
.about-note { font-size: 13px; color: var(--muted); }

.support { background: #e8edeb; }
.support-intro { max-width: 780px; margin-block-end: 52px; }
.support-intro p:last-child { color: #42525b; line-height: 2; margin: 25px 0 0; max-width: 640px; }
.support-form { max-width: 920px; background: #fff; padding: clamp(24px, 5vw, 58px); box-shadow: 0 24px 60px #11232c12; border-radius: 6px; }
.support-form fieldset + fieldset { margin-block-start: 35px; }
.support-form legend { margin-block-end: 15px; }
.choice-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.kind-choice, .amount-choice { position: relative; display: block; cursor: pointer; }
.kind-choice input, .amount-choice input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.kind-choice span, .amount-choice span { display: flex; align-items: center; justify-content: center; min-height: 56px; border: 1.5px solid #c9d4d3; border-radius: 4px; transition: border-color .15s, background-color .15s; }
.kind-choice span { min-height: 91px; align-items: flex-start; flex-direction: column; padding: 15px 20px; font-weight: 700; font-size: 17px; }
.kind-choice small { font-size: 12px; font-weight: 500; color: var(--muted); }
.kind-choice input:checked + span, .amount-choice input:checked + span { background: #e6f5f1; border-color: #187a78; color: #075b5b; }
.kind-choice input:checked + span::after { content: '選択中'; position: absolute; top: 14px; right: 16px; font-size: 11px; }
.amount-choice input:checked + span::after { content: '✓'; padding-inline-start: 5px; }
.kind-choice input:focus-visible + span, .amount-choice input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 3px; }
.amount-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.amount-choice span { font-weight: 700; min-height: 55px; padding: 8px; }
.support-amount:disabled { opacity: .5; }
.custom-amount { margin: 14px 0 0; font-size: 13px; color: var(--muted); }
.custom-entry { display: block; margin-top: 16px; font-size: 14px; font-weight: 700; }
.custom-entry[hidden] { display: none; }
.custom-entry input { display: block; width: min(100%, 320px); margin-top: 8px; padding: 12px; border: 1.5px solid #c9d4d3; border-radius: 4px; font: inherit; }
.custom-entry input:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.support-terms { background: #f3f6f3; border-left: 3px solid #327f7c; padding: 0 26px; margin-block-start: 38px; font-size: 13px; }
.support-terms summary { cursor: pointer; padding-block: 21px; font-size: 15px; font-weight: 700; }
.support-terms summary::marker { color: #147574; }
.support-terms-content { padding-bottom: 21px; }
.support-terms dl { margin: 0; }
.support-terms dl > div { display: flex; gap: 20px; margin-block: 8px; }
.support-terms dt { flex: 0 0 70px; color: var(--muted); }
.support-terms dd { margin: 0; font-weight: 600; }
.support-terms p { margin: 15px 0 0; }
.support-terms a { color: #075b5b; }
.selection-summary { margin: 27px 0 10px; font-weight: 700; }
.form-error { color: #ae2f2a; font-size: 13px; }
.button-primary { min-width: min(100%, 270px); background: #147574; color: #fff; }
.button-primary:hover:not(:disabled) { background: #0d5e5d; }
.button:disabled { cursor: not-allowed; background: #b8c8c6; color: #354947; }
.payment-caption { font-size: 12px; color: var(--muted); margin: 12px 0 0; }

.site-footer { background: var(--dark); color: #fff; padding-block: 42px; }
.footer-inner { display: flex; justify-content: space-between; gap: 25px; align-items: center; }
.footer-inner strong { font-size: 19px; }
.footer-inner p { margin: 5px 0 0; font-size: 12px; color: #aebbbf; }
.footer-inner a { font-size: 12px; text-decoration: none; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px 24px; }
.information-page { padding-block: clamp(64px, 8vw, 110px); max-width: 900px; }
.information-page h1 { font-size: clamp(36px, 5vw, 56px); margin-block-end: 35px; }
.information-page h2 { font-size: 23px; margin-block: 44px 12px; }
.information-page p { line-height: 1.9; }
.information-page a { color: #075b5b; }
.contact-reveal { appearance: none; border: 0; border-bottom: 1px solid currentColor; border-radius: 0; padding: 0; background: none; color: #075b5b; font: inherit; text-align: left; cursor: pointer; }
.contact-reveal:hover, .contact-reveal:focus-visible { color: #033e3e; }
.information-list { margin-block: 38px; border-top: 1px solid #c9d4d3; }
.information-list > div { display: grid; grid-template-columns: minmax(140px, 28%) 1fr; gap: 20px; border-bottom: 1px solid #c9d4d3; padding-block: 19px; line-height: 1.75; }
.information-list dt { font-weight: 700; }
.information-list dd { margin: 0; }

@media (max-width: 800px) {
  .hero-grid { grid-template-columns: 1fr; padding-block: 68px 75px; min-height: 0; }
  .visual { min-height: 330px; max-width: 450px; width: 100%; margin-inline: auto; }
  .about-grid { grid-template-columns: 1fr; gap: 0; }
  .about-body { padding-block-start: 23px; }
}
@media (max-width: 620px) {
  .shell { width: min(100% - 32px, 1160px); }
  .header-inner { min-height: 68px; flex-wrap: wrap; padding-block: 12px; }
  .site-header nav { width: 100%; justify-content: space-between; gap: 8px; font-size: 12px; }
  .hero-grid { padding-block: 56px 60px; }
  .eyebrow { margin-block-end: 24px; font-size: 10px; }
  .hero-lead { margin-block-start: 24px; }
  .hero-actions { gap: 20px; }
  .visual { min-height: 270px; }
  .visual-label strong { font-size: 16px; }
  .section { padding-block: 72px; }
  .choice-row { grid-template-columns: 1fr; }
  .kind-choice span { min-height: 76px; }
  .amount-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .button-primary { width: 100%; }
  .support-terms { padding-inline: 18px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .information-list > div { grid-template-columns: 1fr; gap: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button, .kind-choice span, .amount-choice span { transition: none; }
}