:root{color-scheme:light;--ink:#152b3a;--muted:#526571;--line:#dbe2e5;--paper:#f5f7f7;--teal:#087369;--gold:#9b5d08;--navy:#173e4b;font-family:Inter,"Segoe UI","Microsoft YaHei",system-ui,sans-serif;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;color:var(--ink);background:var(--paper);font-size:16px;line-height:1.65}a{color:var(--teal);text-underline-offset:4px}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible{outline:3px solid #d29525;outline-offset:5px}.skip-link{position:absolute;left:20px;top:-80px;background:white;padding:10px;z-index:5}.skip-link:focus{top:10px}
.site-header{height:92px;display:flex;align-items:center;justify-content:space-between;max-width:1380px;margin:auto;padding:0 52px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);font-weight:750;font-size:21px;text-decoration:none;letter-spacing:-.5px}.brand-mark{width:34px;height:34px;display:grid;place-items:center;background:var(--navy);color:#fff;font-size:23px;border-radius:7px}.brand-sub{font-size:14px;letter-spacing:0;font-weight:450;color:var(--muted);margin-left:4px}.quiet-link{text-decoration:none;color:var(--muted);font-size:14px}main{max-width:1380px;margin:auto;padding:0 52px}
.hero{padding:38px 0 30px}.eyebrow{display:flex;align-items:center;gap:9px;font-size:14px;font-weight:650;letter-spacing:1.4px;color:var(--teal)}.live-dot{height:7px;width:7px;background:var(--teal);border-radius:50%}h1{font-size:clamp(32px,3.8vw,52px);line-height:1.22;letter-spacing:-2px;margin:21px 0;color:#17333f;font-weight:680}.hero-copy{font-size:17px;color:var(--muted);margin:0;line-height:1.9}.hero-meta{display:flex;flex-wrap:wrap;gap:9px 24px;color:var(--muted);font-size:14px;margin-top:25px}.input-strip{display:grid;grid-template-columns:1.2fr 1fr 1.2fr 1fr;gap:24px;padding:25px 0 31px;border-top:1px solid var(--line);margin-top:7px}.input-strip div{display:grid;gap:7px}.input-strip span{font-size:14px;color:var(--muted)}.input-strip strong{font-size:14px;font-weight:620}.input-strip small{font-size:14px;color:var(--muted)}
.results-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:36px;align-items:start}.visual-card{border:1px solid var(--line);border-radius:13px;background:#fff;overflow:hidden}.card-top{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 27px 17px}.section-number{display:block;color:var(--muted);font-size:12px;letter-spacing:1px;font-weight:650}h2{font-size:21px;line-height:1.5;margin:8px 0;font-weight:650;letter-spacing:-.4px}.tag{font-size:12px;border:1px solid var(--line);border-radius:20px;padding:4px 8px;white-space:nowrap;color:var(--muted)}.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);padding:0 23px}.tabs button{font:inherit;font-size:14px;color:var(--muted);border:0;border-bottom:3px solid transparent;padding:12px 16px;background:transparent;cursor:pointer}.tabs button[aria-pressed=true]{border-bottom-color:var(--teal);color:var(--teal);font-weight:700}.tabs button:hover{background:#f1f7f5}figure{margin:0;padding:12px 10px 20px}figure img{display:block;width:100%;height:auto;aspect-ratio:8/5;object-fit:contain;background:#fff}figcaption{border-top:1px solid #edf0f1;padding:14px 15px 0;font-size:12px;color:var(--muted);min-height:75px}figcaption small{display:block;margin-top:4px;font-size:12px}
.numbers{padding-top:24px}.numbers h2{font-size:25px;margin-bottom:27px}.metric{border-top:1px solid var(--line);padding:17px 0}.metric>span{font-size:14px;color:var(--muted)}.metric strong{display:block;font-variant-numeric:tabular-nums;font-size:29px;font-weight:600;letter-spacing:-1px;margin:3px 0;white-space:nowrap}.metric small{font-size:12px;color:var(--muted);display:block}.mesh-meta{display:flex;gap:20px;font-size:12px;padding:13px 0 18px}.mesh-meta b{font-size:16px;color:var(--ink);font-weight:650}.text-link{font-size:12px;font-weight:600}.verdict{display:grid;grid-template-columns:1fr 1fr;gap:36px;border-bottom:1px solid var(--line);padding:27px 0 29px}.verdict p{font-size:14px;color:var(--muted);margin:7px 0 0}.status-pass,.status-warn{font-size:12px;font-weight:700;letter-spacing:.2px}.status-pass{color:var(--teal)}.status-warn{color:var(--gold)}
.workflow{padding:45px 0}.section-heading p{font-size:14px;color:var(--muted);margin:10px 0 25px}.steps{display:grid;grid-template-columns:1fr 1.3fr 1fr;gap:28px}.steps article{padding:22px;border:1px solid var(--line);border-radius:9px;background:#fff}.step-id{font-size:12px;color:var(--teal);font-weight:700}.steps h3{font-size:16px;line-height:1.5;margin:10px 0}.steps p{font-size:14px;color:var(--muted);line-height:1.8}.steps a{display:block;font-size:14px;margin:10px 0}.steps small{display:block;font-size:12px;color:var(--muted);line-height:1.8}.steps pre{font-size:12px;background:#eef3f3;color:#214e57;padding:12px;line-height:1.8;border-radius:5px;white-space:pre-wrap;overflow-wrap:anywhere}.evidence-note{border-top:1px solid var(--line);padding:20px 0 48px;max-width:900px}.evidence-note h2{font-size:17px}.evidence-note p{font-size:14px;color:var(--muted);line-height:1.9}.evidence-note a{font-size:14px}footer{border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;max-width:1380px;padding:24px 52px;margin:auto;font-size:12px;color:var(--muted)}.noscript{padding:20px;background:#fff5df;font-size:14px}
@media(min-width:1450px){.hero{padding-top:68px}.results-layout{grid-template-columns:minmax(0,1fr) 290px;gap:45px}}
@media(max-width:1000px){main,.site-header{padding-left:28px;padding-right:28px}.results-layout{grid-template-columns:minmax(0,1fr) 230px;gap:24px}.metric strong{font-size:25px}.input-strip{gap:15px}.input-strip strong{font-size:14px}.steps{gap:15px;grid-template-columns:repeat(3,minmax(0,1fr))}.steps article{padding:17px}.brand-sub{display:none}}
@media(max-width:720px){.site-header{height:72px;padding:0 20px}.brand{font-size:18px}.quiet-link{font-size:12px}main{padding:0 20px}.hero{padding:36px 0 25px}h1{letter-spacing:-1px;font-size:37px}.hero-copy{font-size:14px}.desktop-break{display:none}.hero-meta{font-size:12px;gap:7px 15px}.input-strip{grid-template-columns:1fr 1fr;gap:20px;padding:23px 0}.results-layout{display:block}.card-top{padding:19px 18px 12px;gap:10px}.card-top h2{font-size:17px}.tabs{padding:0 12px}.tabs button{padding:10px 15px}.numbers{padding:25px 0 0;display:grid;grid-template-columns:1fr;gap:0 20px}.numbers>.section-number,.numbers>h2,.numbers>.text-link,.mesh-meta{grid-column:1/-1}.numbers h2{font-size:22px;margin:7px 0 15px}.numbers h2 br{display:none}.metric strong{font-size:24px}.metric small{font-size:12px}.verdict{gap:18px;padding:22px 0}.verdict p{font-size:12px}.workflow{padding:30px 0}.steps{grid-template-columns:1fr;gap:13px}.steps article{padding:20px}.steps p{font-size:14px}.steps pre{font-size:14px}.steps small{font-size:12px}.section-heading h2{font-size:21px}footer{padding:22px 20px;flex-wrap:wrap;gap:9px 20px}figcaption{font-size:12px;min-height:83px}.evidence-note{padding-bottom:27px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media(max-width:720px){h1{font-size:clamp(24px,8vw,32px);letter-spacing:-.8px}}
@media print{.site-header,.tabs,.workflow,footer{display:none}body{background:#fff}main{max-width:none;padding:0}h1{font-size:32px}.hero{padding-top:0}.results-layout{grid-template-columns:1fr 230px}.visual-card,.verdict{break-inside:avoid}.evidence-note{padding-bottom:0}.hero-meta{margin-top:10px}}

/* Extend the recorded-example layout for the five-solve bracket study. */
.input-strip{grid-template-columns:1.1fr 1.2fr 1.2fr 1fr;gap:20px}
.input-strip div>small{font-size:13px;line-height:1.6}
.numbers{min-width:0}.mesh-meta{flex-wrap:wrap;gap:10px 20px}
.study-section{padding:38px 0 12px;border-bottom:1px solid var(--line)}
.study-section .section-heading p{max-width:960px}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:9px;background:#fff;margin:18px 0 12px}
.table-scroll:focus-visible,summary:focus-visible{outline:3px solid #d29525;outline-offset:4px}
table{border-collapse:collapse;width:100%;font-size:14px;font-variant-numeric:tabular-nums}
caption{text-align:left;padding:15px 18px;font-weight:600;background:#edf3f3;color:var(--ink)}
th,td{padding:13px 16px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}
thead th{font-size:13px;color:var(--muted);font-weight:600}th:first-child{text-align:left}tbody th{font-weight:500}
tbody tr:last-child th,tbody tr:last-child td{border-bottom:0}
.primary-case{background:#eaf5f1}.primary-case th{color:#086257;font-weight:700}
.table-note{font-size:13px;color:var(--muted);line-height:1.8;margin:12px 0 24px}
.linearity-card{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(230px,1fr);gap:32px;background:#edf3f3;border:1px solid var(--line);border-radius:9px;padding:24px;margin-top:24px}
.linearity-card h3{font-size:20px;letter-spacing:-.4px;margin:12px 0;overflow-wrap:anywhere}
.linearity-card p{font-size:14px;line-height:1.8;color:var(--muted);margin-bottom:0}
.linearity-card dl{margin:0}.linearity-card dl>div{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding:10px 0}
.linearity-card dl>div:last-child{border-bottom:0}.linearity-card dt{font-size:13px;color:var(--muted)}
.linearity-card dd{margin:0;font-size:16px;font-weight:600;font-variant-numeric:tabular-nums;white-space:nowrap}
.status-not-run{color:var(--muted);font-weight:650}.status-fail{color:#a72724;font-weight:700}
details>summary{cursor:pointer;font-size:15px;font-weight:650;padding:16px 0}
.check-details{margin:12px 0 20px}.check-details>p,.geometry-details>p{font-size:14px;color:var(--muted)}
.checks-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}.checks-grid h3{font-size:16px}
.checks-grid dl{margin:0}.checks-grid dl>div{display:flex;gap:15px;justify-content:space-between;padding:9px 0;border-bottom:1px solid var(--line);font-size:13px}
.checks-grid dt{overflow-wrap:anywhere;min-width:0}.checks-grid dd{margin:0;white-space:nowrap}
.geometry-details{margin:22px 0;border-bottom:1px solid var(--line)}
.geometry-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:18px 0 25px}
.geometry-grid figure{background:#fff;border:1px solid var(--line);border-radius:9px;min-width:0}
.geometry-grid figcaption{min-height:0}.evidence-note a{display:inline-block;margin:6px 22px 6px 0}
@media(max-width:1000px){.input-strip{grid-template-columns:1fr 1fr}.linearity-card{gap:24px;padding:20px}}
@media(max-width:720px){.input-strip{gap:20px 14px}.input-strip div>small{font-size:12px}.input-strip strong{overflow-wrap:anywhere}.tabs{flex-wrap:wrap}.study-section{padding-top:28px}.table-scroll{margin-left:0;margin-right:0}th,td{padding:12px}.linearity-card{grid-template-columns:1fr;gap:16px;padding:18px}.linearity-card h3{font-size:18px}.checks-grid,.geometry-grid{grid-template-columns:1fr;gap:20px}.verdict{grid-template-columns:1fr}.geometry-grid figure{padding-bottom:15px}.checks-grid dd{font-size:12px}}
@media print{.geometry-details,.check-details{display:none}.table-scroll{overflow:visible}table{font-size:10px}th,td{padding:6px;white-space:normal}.linearity-card{break-inside:avoid}.study-section{break-inside:auto}}