:root {
    --paper: #f8f8f2;
    --surface: #fffefa;
    --tint: #eef1e8;
    --ink: #263e3c;
    --muted: #5e726b;
    --green: #315f50;
    --line: #dce2d8;
    font-family: -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.85;
    -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
body { margin: 0; }
html { scroll-behavior: smooth; }
a { color: var(--green); text-underline-offset: .25em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid #bc7d3c; outline-offset: 4px; }
svg { flex-shrink: 0; vertical-align: middle; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-weight: 600; overflow-wrap: anywhere; }
h2 { font-size: 26px; line-height: 1.65; }
h3 { font-size: 18px; line-height: 1.65; }
p { font-size: 14px; }
.container { width: 100%; max-width: 1160px; margin-inline: auto; padding-inline: 40px; }
section { padding-block: 64px; }
.skip-link { position: absolute; left: 16px; top: -100px; background: var(--green); color: white; padding: 10px 16px; z-index: 10; }
.skip-link:focus { top: 12px; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-block: 26px; }
.brand { font-size: 18px; font-weight: 650; line-height: 1.6; text-decoration: none; color: var(--ink); }
.brand span { display: block; font-size: 10px; letter-spacing: .16em; font-weight: 500; color: var(--muted); }
.site-header nav, .footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.site-header nav a { color: var(--muted); text-decoration: none; font-size: 12px; }
.site-header nav a:hover { color: var(--green); text-decoration: underline; }
.hero { padding-block: 64px 80px; }
.hero-content { display: grid; grid-template-columns: 1.4fr 1fr; align-items: center; gap: 64px; }
.hero-content > *, .academy-content > * { min-width: 0; }
.hero-badge { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; font-size: 12px; color: var(--muted); }
.section-label { display: block; color: #527c6c; font-size: 11px; font-weight: 650; letter-spacing: .13em; }
.hero-title { font-size: clamp(30px, 3.3vw, 43px); line-height: 1.65; letter-spacing: .02em; margin-block: 20px; }
.hero-name { font-weight: 600; font-size: 16px; margin-top: 24px; }
.hero-lead { color: var(--muted); margin-top: 12px; }
.hero-cta { display: flex; align-items: flex-start; flex-direction: column; gap: 12px; margin-top: 28px; }
.cta-note { color: var(--muted); font-size: 12px; }
.btn { display: inline-flex; justify-content: center; align-items: center; gap: 14px; min-height: 48px; padding: 13px 20px; border: 1px solid #aabbb1; border-radius: 6px; color: var(--green); font-size: 14px; font-weight: 600; line-height: 1.6; text-decoration: none; transition: background-color .15s; }
.btn-primary { background: var(--green); border-color: var(--green); color: white; }
.btn:hover { background: #e5ebe1; text-decoration: none; }
.btn-primary:hover { background: #244a3d; }
.hero-aside { background: var(--tint); border: 1px solid var(--line); border-radius: 10px; padding: 32px; }
.community-path { list-style: none; margin: 24px 0 0; padding: 0; }
.community-path li { display: flex; gap: 20px; padding: 22px 0; border-top: 1px solid #d0dacb; }
.community-path li:last-child { padding-bottom: 0; }
.community-path li > span { color: #527c6c; font-size: 12px; padding-top: 7px; }
.community-path h2 { font-size: 21px; }
.community-path p { color: var(--muted); margin-top: 6px; font-size: 13px; }
.section-header { margin-bottom: 32px; }
.section-title { margin-top: 12px; }
.concept { border-top: 1px solid var(--line); }
.concept-grid, .features-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.concept-card { padding-right: 20px; }
.concept-icon { margin-bottom: 18px; }
.concept-icon svg { width: 36px; height: 36px; }
.concept-title { margin-bottom: 12px; }
.concept-description, .feature-description { color: var(--muted); }
.features { background: var(--tint); }
.feature-card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 26px; }
.feature-number { font-size: 12px; color: #527c6c; letter-spacing: .1em; margin-bottom: 14px; }
.feature-title { margin-bottom: 14px; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 22px; }
.tag { font-size: 11px; color: var(--muted); padding: 3px 9px; background: var(--tint); border-radius: 4px; }
.learn-examples { margin-top: 22px; border-top: 1px solid var(--line); padding-top: 16px; }
.learn-examples-label { color: var(--muted); font-size: 11px; }
.learn-link { display: flex; gap: 8px; align-items: flex-start; font-size: 12px; margin-top: 12px; }
.learn-link svg { margin-top: 5px; }
.learn-link .link-arrow { margin-left: auto; }
.academy-content { display: grid; grid-template-columns: 1.5fr 1fr; gap: 64px; align-items: start; }
.academy-description { color: var(--muted); margin-top: 20px; }
.academy-levels { margin-block: 24px; }
.level-item { padding-block: 16px; border-top: 1px solid var(--line); }
.level-badge { font-size: 11px; font-weight: 650; letter-spacing: .06em; color: var(--green); }
.level-item p { margin-top: 6px; }
.academy-wip-note { display: flex; gap: 8px; color: var(--muted); font-size: 12px; margin-top: 14px; }
.academy-note { border-left: 3px solid #a6bba1; background: var(--tint); padding: 18px 22px; margin-top: 28px; }
.academy-note p { font-size: 13px; }
.academy-visual { padding: 30px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.visual-card { display: flex; gap: 16px; align-items: center; border-top: 1px solid var(--line); padding-block: 22px; }
.visual-card:first-of-type { margin-top: 24px; }
.visual-card:last-child { padding-bottom: 0; }
.card-icon { font-size: 12px; color: #527c6c; }
.card-text { font-size: 15px; }
.content-section { border-top: 1px solid var(--line); }
.content-box { display: flex; align-items: center; gap: 24px; padding: 30px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; }
.content-box:hover { border-color: #8fa798; }
.content-icon { background: var(--green); padding: 12px; border-radius: 8px; flex-shrink: 0; }
.content-text { flex: 1; }
.content-text p { color: var(--muted); margin-top: 12px; }
.content-note-label { color: var(--muted); font-size: 11px; }
.btn-note { flex-shrink: 0; }
.cta-section { background: var(--tint); }
.cta-content { display: grid; grid-template-columns: 1fr 1fr; column-gap: 64px; align-items: start; }
.cta-title { font-size: 28px; line-height: 1.7; }
.gradient-text { color: var(--green); }
.cta-description { color: var(--muted); margin-top: 20px; grid-column: 1; }
.cta-description br { display: none; }
.cta-box { grid-column: 2; grid-row: 1 / 3; border: 1px solid #d0dacb; border-radius: 10px; padding: 28px; background: var(--surface); }
.cta-box-content > p { margin-top: 12px; }
.cta-box .btn { margin-top: 24px; }
.footer { padding-block: 40px 24px; }
.footer-brand h3 { font-size: 16px; }
.footer-brand p { font-size: 12px; color: var(--muted); margin-top: 8px; }
.footer-links { margin-top: 22px; }
.footer-links a { font-size: 12px; }
.footer-bottom { border-top: 1px solid var(--line); padding-top: 20px; margin-top: 28px; color: var(--muted); }
.footer-bottom p { font-size: 11px; }
@media (max-width: 960px) {
    .hero-content { gap: 32px; }
    .concept-grid, .features-grid { gap: 16px; }
    .feature-card { padding: 20px; }
    .academy-content, .cta-content { column-gap: 32px; }
    .content-box { flex-wrap: wrap; }
    .content-text { flex-basis: 70%; }
    .btn-note { margin-left: 84px; }
}
@media (max-width: 720px) {
    .container { padding-inline: 24px; }
    section { padding-block: 44px; }
    .site-header { flex-direction: column; align-items: flex-start; gap: 16px; padding-block: 22px; }
    .site-header nav { gap: 20px; }
    .hero { padding-block: 28px 44px; }
    .hero-content, .academy-content, .cta-content { grid-template-columns: minmax(0, 1fr); gap: 32px; }
    .hero-title { font-size: clamp(28px, 6.8vw, 40px); }
    .hero-lead br { display: none; }
    .hero-aside { padding: 24px; }
    .community-path li { padding-block: 16px; }
    .concept-grid, .features-grid { grid-template-columns: minmax(0, 1fr); gap: 24px; }
    .concept-card { padding: 0 0 24px; border-bottom: 1px solid var(--line); }
    .concept-card:last-child { border-bottom: 0; padding-bottom: 0; }
    .concept-icon { margin-bottom: 12px; }
    .feature-card { padding: 24px; }
    h2 { font-size: 23px; }
    .academy-visual { padding: 24px; }
    .content-box { padding: 24px; gap: 16px; }
    .content-icon { display: none; }
    .content-text { flex-basis: 100%; }
    .btn-note { margin-left: 0; }
    .cta-title { font-size: 25px; }
    .cta-description { margin-top: -16px; }
    .cta-box { grid-column: 1; grid-row: auto; padding: 24px; }
    .footer-links { gap: 14px 20px; }
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .btn { transition: none; }
}