:root { --ink:#1e293b; --accent:#1d4ed8; --surface:#f8fafc; --line:#dbeafe; }
* { box-sizing:border-box; }
body { margin:0; color:var(--ink); background:var(--surface); font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",sans-serif; line-height:1.8; }
a { color:inherit; }
.site-header { background:#fff; border-bottom:1px solid var(--line); }
.site-header-inner, main { width:min(1080px, calc(100% - 32px)); margin:0 auto; }
.site-header-inner { display:flex; align-items:center; justify-content:space-between; min-height:64px; }
.brand { color:var(--accent); font-weight:800; text-decoration:none; }
.home-link { color:#52616b; font-size:.92rem; }
main { padding:44px 0 64px; }
.hero { display:grid; grid-template-columns:minmax(0,1.1fr) minmax(260px,.9fr); gap:36px; align-items:center; background:#fff; border:1px solid var(--line); border-radius:20px; padding:32px; box-shadow:0 10px 30px rgba(15,118,110,.08); }
.hero-simple { grid-template-columns:1fr; }
.eyebrow { margin:0 0 8px; color:var(--accent); font-weight:800; font-size:.88rem; letter-spacing:.06em; }
h1 { margin:0 0 12px; font-size:clamp(2rem,4vw,3.2rem); line-height:1.25; }
h2 { margin:36px 0 12px; font-size:1.35rem; }
.lead { margin:0; font-size:1.08rem; }
.animation { width:100%; aspect-ratio:1; object-fit:contain; border:1px solid var(--line); border-radius:14px; background:#fff; }
.actions { display:flex; gap:12px; flex-wrap:wrap; margin-top:24px; }
.button { display:inline-block; padding:10px 18px; border-radius:999px; text-decoration:none; font-weight:800; background:var(--accent); color:#fff; }
.button.secondary { background:#e7f2f0; color:#075f58; }
.x-share-button { background:#111827; color:#fff; }
.x-share-button:hover { background:#000; }
.content { margin-top:26px; padding:8px 28px 28px; background:#fff; border:1px solid var(--line); border-radius:20px; }
.content li { margin:.45em 0; }
.notice { font-size:.9rem; color:#5b6870; }
.index-intro { max-width:760px; margin-bottom:28px; }
.grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:18px; }
.card { display:flex; flex-direction:column; min-height:190px; overflow:hidden; background:#fff; border:1px solid var(--line); border-radius:16px; text-decoration:none; transition:transform .15s, box-shadow .15s; }
.card:hover { transform:translateY(-3px); box-shadow:0 12px 24px rgba(15,118,110,.12); }
.card img { width:100%; aspect-ratio:1; object-fit:cover; border-bottom:1px solid var(--line); }
.card div { padding:16px; }
.card-number { margin:0 0 6px; color:var(--accent) !important; font-size:.75rem !important; font-weight:800; letter-spacing:.06em; }
.card h2 { margin:0 0 5px; font-size:1.25rem; }
.card p { margin:0; color:#53616a; font-size:.94rem; line-height:1.65; }
footer { padding:24px 0 36px; text-align:center; color:#64748b; font-size:.85rem; }
@media (max-width:700px) { .hero { grid-template-columns:1fr; padding:22px; gap:22px; } .site-header-inner, main { width:min(100% - 24px, 1080px); } }
.breadcrumb { color:#475569; margin-bottom:20px; font-size:.9rem; }
.site-header-inner { gap:16px; flex-wrap:wrap; padding:12px 0; }
.lesson-links, .page-nav { display:flex; flex-wrap:wrap; gap:12px; margin:24px 0; }
.lesson-links a { color:#1e40af; background:#eff6ff; border-radius:6px; padding:6px 10px; }
.page-nav { justify-content:space-between; }
.action-names { display:flex; gap:8px 28px; flex-wrap:wrap; }
.content a, .index-intro a { color:#1d4ed8; }
:focus-visible { outline:3px solid #ea580c; outline-offset:4px; }
body { overflow-wrap:anywhere; }
.sign-preview { margin:28px 0; padding:24px; border:1px solid var(--line); border-radius:16px; background:white; display:grid; grid-template-columns:minmax(0,448px) minmax(0,1fr); gap:28px; align-items:center; }
.sign-preview figure { margin:0; }
.sign-preview img { display:block; width:100%; height:auto; }
.sign-preview figcaption { margin-top:12px; color:#334155; font-weight:700; }
@media(max-width:760px) { .sign-preview { grid-template-columns:1fr; padding:16px; } }