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(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}.sign{flex-direction:column;margin:0;line-height:1.1;display:inline-flex}.sign-zh{font-family:var(--font-zh);letter-spacing:.08em;font-weight:700}.sign-en{font-family:var(--font-body);font-weight:600}.sign-tag{background:var(--sign-bg);color:var(--sign-fg);border-radius:6px;flex-direction:row;align-items:baseline;gap:8px;width:fit-content;padding:5px 10px 5px 9px}.sign-tag .sign-zh{font-size:.95rem}.sign-tag .sign-en{opacity:.85;font-size:.8rem}.sign-plate{background:var(--sign-bg);color:var(--sign-fg);width:100%;box-shadow:inset 0 -4px 0 var(--sign-edge);border-radius:8px;gap:3px;padding:10px 14px 11px;position:relative}.sign-plate .sign-zh{font-size:1.45rem}.sign-plate .sign-en{opacity:.9;font-size:.9rem}.section-tight{padding-top:48px}.feature-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:16px;margin:24px 0 0;padding:0;list-style:none;display:grid}.feature{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-m);height:100%;color:var(--ink);flex-direction:column;gap:10px;padding:22px;text-decoration:none;transition:border-color .15s,transform .15s;display:flex}.feature:hover{border-color:var(--rail);color:var(--ink);transform:translateY(-2px)}.feature-title{font-family:var(--font-display);text-wrap:balance;font-size:1.3rem;font-weight:700;line-height:1.2}.feature:hover .feature-title{color:var(--rail)}.feature-desc{color:var(--muted);font-size:var(--step--1);line-height:1.5}.feature-meta{color:var(--muted);margin-top:auto;font-size:.8rem}.start-strip{border-radius:var(--radius-m);background:var(--rail-tint);color:var(--ink);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px 32px;margin-top:16px;padding:20px 24px;text-decoration:none;display:flex}.start-strip:hover{color:var(--ink)}.start-strip-text{gap:2px;max-width:64ch;display:grid}.start-strip-text strong{font-family:var(--font-display);font-size:1.15rem}.start-strip-text span{color:var(--muted);font-size:var(--step--1)}.start-strip-cta{background:var(--rail);color:var(--on-rail);border-radius:var(--radius-s);white-space:nowrap;padding:10px 18px;font-weight:700}.start-strip:hover .start-strip-cta{background:var(--rail-hover)}.topics{grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:32px 28px;margin-top:24px;display:grid}.topic-block{flex-direction:column;gap:12px;display:flex}.topic-guides{margin:0;padding:0;list-style:none}.topic-guides li+li{border-top:1px solid var(--line)}.topic-guides a{color:var(--ink);padding:8px 0;font-weight:600;line-height:1.35;text-decoration:none;display:block}.topic-guides a:hover{color:var(--rail);text-decoration:underline}.topic-next{font-size:var(--step--1);color:var(--muted)}.topic-next-label{margin-bottom:2px;font-size:.78rem;font-weight:600;display:block}.topic-next ul{margin:0;padding-left:1.1em}.topic-next li{margin:2px 0;line-height:1.4}.principles{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--card)}.principles-inner{grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:0;display:grid}.principles-inner>div{font-size:var(--step--1);gap:4px;padding:24px 24px 24px 0;display:grid}.principles-inner>div+div{border-left:1px solid var(--line);padding-left:24px}@media (width<=860px){.principles-inner>div+div{border-left:0;border-top:1px solid var(--line);padding-left:0}}.principles strong{font-family:var(--font-display);font-size:1rem}.principles span{color:var(--muted)}.head-sign{margin-bottom:16px;text-decoration:none;display:inline-block}.stub-fields{gap:12px;width:100%;margin:0;display:grid}@media (width<=759px){.stub-fields{grid-template-columns:repeat(auto-fit,minmax(120px,1fr))}}.stub-fields dt{color:var(--muted);font-size:.75rem}.stub-fields dd{margin:0;font-size:.95rem;font-weight:700}@media (prefers-reduced-motion:reduce){.feature:hover{transform:none}}