:root{--paper:#fffaf0;--ink:#233f3a;--muted:#5d7169;--line:#e5e5d6;--leaf:#347461;--sun:#f3c768;--pink:#d97767;font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);line-height:1.75}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-underline-offset:4px}button,textarea{font:inherit}button{cursor:pointer;border:1px solid var(--line);background:white;color:var(--ink);border-radius:14px;padding:12px 20px;min-height:48px;line-height:1.5}button:hover,a.button:hover{border-color:var(--leaf)}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid var(--pink);outline-offset:4px}[hidden]{display:none!important}.top{max-width:1280px;margin:auto;padding:25px 32px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:14px}.top a{text-decoration:none;font-weight:650}.top span{color:var(--muted)}main{max-width:1280px;padding:55px 32px 35px;margin:auto}.intro{max-width:850px}.eyebrow{font-size:13px;font-weight:750;letter-spacing:2px;color:var(--leaf);margin:0 0 15px}h1{font-size:clamp(36px,4.8vw,64px);line-height:1.3;letter-spacing:.01em;margin:0 0 25px}h2,h3{line-height:1.45;margin:0 0 15px}.lead{font-size:20px;color:var(--muted);max-width:740px}.goal{display:flex;gap:28px;align-items:center;background:#edf3e8;border:1px solid #d9e6d3;border-radius:22px;padding:26px 30px;margin:30px 0;max-width:740px}.goal span{font-size:14px;color:var(--leaf);flex:0 0 150px}.goal strong{font-size:26px;line-height:1.6}.guide{font-size:17px;color:var(--muted);margin:0 0 50px}.filter{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:25px}.filter button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:white}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.card{background:#fff;border:1px solid var(--line);border-radius:23px;overflow:hidden;display:flex;flex-direction:column;min-width:0;box-shadow:0 8px 24px #304c3910}.card.selected{box-shadow:0 0 0 3px var(--leaf)}.shot{display:block;aspect-ratio:4/3;overflow:hidden;background:#e9f0e6;border-bottom:1px solid var(--line)}.shot img{display:block;width:100%;height:100%;object-fit:cover;object-position:top}.card-body{padding:23px 25px 18px;flex:1}.card-code{display:flex;align-items:center;gap:9px;font-size:12px;font-weight:700;color:var(--muted);margin:0 0 10px}.card-code strong{font-size:20px;line-height:1;color:var(--leaf)}.card.opus .card-code strong{color:#9d6255}.card h3{font-size:25px}.card p{font-size:15px;color:var(--muted);margin:0 0 12px}.card .mechanism{font-size:16px;color:var(--ink)}.card-actions{padding:0 25px 25px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}.card-actions a{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;min-height:48px;border:1px solid var(--ink);background:var(--ink);color:#fff;border-radius:13px;padding:10px 17px;font-size:15px}.card-actions button{font-size:15px;padding:10px 17px}.decision{margin-top:45px;border:2px solid var(--leaf);background:#edf5e9;border-radius:23px;padding:30px}.decision h2{font-size:30px}.decision p{margin:0 0 15px}.decision-actions{display:flex;gap:16px;align-items:center;flex-wrap:wrap}.decision-actions button:first-child{background:var(--leaf);color:white;border-color:var(--leaf)}.quiet{background:transparent}.decision-actions a{font-size:15px}#copy-status{font-size:14px;color:var(--muted);margin-top:14px;margin-bottom:0}textarea{width:100%;padding:12px;border:1px solid var(--leaf);border-radius:10px;margin-top:10px;color:var(--ink);background:white}.how{border-top:1px solid var(--line);margin-top:55px;padding-top:35px;max-width:850px}.how h2{font-size:26px}.how ol{font-size:18px;padding-left:25px}.how li{margin:8px 0}.how p{color:var(--muted);font-size:16px}footer{max-width:1280px;margin:auto;border-top:1px solid var(--line);padding:25px 32px 35px;color:var(--muted);font-size:13px}@media(max-width:980px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:580px){.top{padding:20px;gap:12px;font-size:12px}.top span{max-width:145px;text-align:right}main{padding:38px 20px 25px}.lead{font-size:18px}.goal{display:block;padding:21px;margin:25px 0}.goal span{display:block;margin-bottom:10px}.goal strong{font-size:24px}.guide{font-size:16px;margin-bottom:35px}.filter{gap:7px}.filter button{padding:11px 13px;font-size:13px}.cards{grid-template-columns:minmax(0,1fr);gap:24px}.card-body{padding:20px}.card-actions{padding:0 20px 22px}.decision{padding:23px}.decision h2{font-size:25px}.how h2{font-size:24px}.how ol{font-size:17px}footer{padding:22px 20px 30px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}

/* O3 second-topic comparison entry. */
.new-topic{margin:0 0 38px;padding:26px 30px;background:#eaf2e7;border:1px solid #cbddc5;border-radius:22px;display:flex;align-items:center;justify-content:space-between;gap:24px}.new-topic h2{font-size:26px;line-height:1.4;margin:0 0 8px}.new-topic p{margin:0 0 8px}.new-topic .eyebrow{font-size:13px}.new-topic-links{display:flex;flex-direction:column;gap:10px;flex-shrink:0}.new-topic-links a{display:flex;align-items:center;justify-content:center;min-height:48px;padding:10px 16px;border-radius:12px;background:#fff;color:#234c3e;text-decoration:none;border:1px solid #bcd1b7;font-weight:700}.new-topic-links a:first-child{background:#2f7d4f;color:white;border-color:#2f7d4f}@media(max-width:720px){.new-topic{padding:22px;display:block}.new-topic-links{margin-top:18px}.new-topic h2{font-size:24px}}