.eft-hero-title{max-width:840px}.eft-article-hero h1{font-size:clamp(2rem,3.45vw,3.1rem);line-height:1.13}.eft-article-hero .efb-hero-grid{grid-template-columns:1.12fr 1fr;align-items:start}.eft-article-hero figure{margin-top:24px}.eft-definition{border-left:4px solid var(--teal);background:#e9f1ee;padding:20px 24px;border-radius:0 12px 12px 0}.eft-family-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:24px 0 36px}.eft-family-nav a{display:flex;gap:14px;align-items:center;text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;line-height:1.35}.eft-family-nav a span{font-size:1.4rem;font-weight:750;color:var(--teal)}.eft-family-nav a:hover{border-color:var(--teal);background:var(--soft)}.eft-directory{margin:40px 0}.eft-directory>h2{font-size:1.85rem;letter-spacing:-.025em}.eft-families{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.eft-family{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}.eft-family summary{list-style:none;display:grid;grid-template-columns:48px 1fr 20px;gap:14px;align-items:center;cursor:pointer;padding:22px}.eft-family summary::-webkit-details-marker{display:none}.eft-family-num{color:var(--teal);font-size:1.35rem;font-weight:750}.eft-family summary strong{display:block;font-size:1.15rem;line-height:1.35}.eft-family summary small{display:block;color:var(--muted);margin-top:7px;font-size:.82rem;line-height:1.5}.eft-plus{font-size:1.65rem}.eft-family[open] .eft-plus{transform:rotate(45deg)}.eft-family-content{border-top:1px solid var(--line);padding:20px 25px;line-height:1.8;color:var(--muted)}.eft-family-content p{margin:0 0 14px}.eft-family-content ul{padding-left:21px}.eft-family-content li{margin-bottom:7px}.eft-reading-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;margin:24px 0}.eft-reading-list a{background:#fff;border:1px solid var(--line);border-radius:12px;text-decoration:none;padding:22px;line-height:1.6}.eft-reading-list a strong{display:block;font-size:1.07rem;color:var(--ink);margin-bottom:8px}.eft-reading-list a span{color:var(--muted);font-size:.9rem}.eft-intro{max-width:840px;line-height:1.9;font-size:1.06rem}.eft-kicker{font-size:.78rem;color:var(--muted)}.eft-article-hero img{aspect-ratio:1200/760;object-fit:contain;background:#fff;border:1px solid var(--line)}.efb-body .efb-table table{min-width:580px}.efb-body figure img{aspect-ratio:1200/760;object-fit:contain}.efb-body .equation{max-width:100%;overflow:auto}.efb-body .math-inline{font-size:1em}.efb-body .math-display{display:block;max-width:100%;overflow:auto;border:1px solid var(--line);background:#fff;border-radius:9px;padding:22px;margin:24px 0}.eft-refs{font-size:.94rem}.eft-refs li{overflow-wrap:anywhere}.eft-ad-space{min-height:280px;contain:layout style}.eft-table-note{font-size:.86rem;color:var(--muted)}
@media(max-width:900px){.eft-family-nav{grid-template-columns:repeat(2,minmax(0,1fr))}.eft-article-hero .efb-hero-grid{grid-template-columns:1fr;gap:15px}.eft-article-hero figure{margin-top:0;max-width:720px}.eft-reading-list{grid-template-columns:1fr}}
.eft-expand{display:inline-block;margin-top:12px;padding:7px 0;font-weight:700}.eft-expand:focus-visible{outline:2px solid var(--teal);outline-offset:3px}
@media(max-width:620px){.eft-article-hero h1{font-size:2rem;line-height:1.17}.eft-family-nav{grid-template-columns:1fr}.eft-families{grid-template-columns:1fr}.eft-family summary{padding:18px;grid-template-columns:34px 1fr 18px}.eft-family-content{padding:18px}.eft-intro{font-size:1rem}.eft-definition{padding:17px 19px}.eft-directory>h2{font-size:1.6rem}}