:root{--bg:#f5efe4;--paper:#fffaf2;--ink:#241b14;--muted:#75685d;--line:#deccb3;--green:#2f8f6b;--blue:#315f9d;--orange:#ee9b21;--red:#c95b52;--shadow:0 24px 70px rgba(62,45,25,.11);--radius:24px}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 0 0,#fff7e5 0,#f5efe4 38%,#ebdbc4 100%);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans SC","PingFang SC",Arial,sans-serif;color:var(--ink);line-height:1.68}.top{position:sticky;top:0;z-index:40;background:rgba(255,250,242,.9);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.top-inner{max-width:1320px;margin:auto;padding:12px 22px;display:flex;justify-content:space-between;gap:16px;align-items:center}.brand{font-weight:900}.brand span{color:var(--green)}.nav{display:flex;gap:8px;flex-wrap:wrap}.pill{border:1px solid var(--line);background:#fffaf2;border-radius:999px;padding:7px 11px;text-decoration:none;color:var(--muted);font-size:13px}.pill:hover{color:var(--ink);border-color:var(--orange)}.shell{max-width:1320px;margin:0 auto;padding:28px 22px 90px}.hero{display:grid;grid-template-columns:minmax(0,1.2fr) 350px;gap:20px;margin-bottom:20px}.panel{background:rgba(255,250,242,.94);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.hero-main{padding:40px}.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:900;color:var(--green)}h1{font-size:clamp(34px,5vw,62px);line-height:1;margin:10px 0 16px;letter-spacing:-.05em}.lead{font-size:18px;color:var(--muted)}.layout{display:grid;grid-template-columns:minmax(0,1fr) 315px;gap:22px}.side{position:sticky;top:78px;display:grid;gap:14px;align-self:start}.section{padding:26px}.content{padding:32px}.content h1{font-size:38px}.content h2{font-size:27px;margin-top:34px;border-top:1px solid var(--line);padding-top:24px}.content h3{font-size:21px;margin-top:24px}.content p,.content li{font-size:16px}.content blockquote{border-left:5px solid var(--orange);background:#fff0d0;margin:16px 0;padding:12px 18px;border-radius:14px}.content pre{background:#211b16;color:#ffefd7;border-radius:16px;padding:16px;overflow:auto;white-space:pre-wrap}.content code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}.content table{width:100%;border-collapse:separate;border-spacing:0;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:white;margin:14px 0}.content th,.content td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}.content tr:last-child td{border-bottom:0}.content th{background:#f3e8d7;text-align:left}.contract{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.contract div{background:white;border:1px solid var(--line);border-radius:14px;padding:10px}.ok{color:var(--green);font-weight:900}.warn{color:var(--red);font-weight:900}.btn{display:inline-flex;padding:11px 16px;border-radius:999px;background:var(--ink);color:white;text-decoration:none;border:0;font-weight:850;cursor:pointer}.btn.secondary{background:white;color:var(--ink);border:1px solid var(--line)}.btn.green{background:var(--green)}.toc{display:grid;gap:6px}.toc a{text-decoration:none;color:var(--muted);padding:7px 9px;border-radius:12px}.toc a:hover{background:white;color:var(--ink)}.small{font-size:13px;color:var(--muted)}.artifact-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.field label{display:block;font-weight:800;font-size:13px;margin-bottom:5px}.field textarea{width:100%;min-height:95px;border:2px dashed #d2bfa4;background:#fffdf8;border-radius:16px;padding:12px;font:14px/1.55 inherit;resize:vertical}.field.full{grid-column:1/-1}.feedback{display:none;margin-top:12px;background:#eaf7f0;border:1px solid #b8ddcd;border-radius:14px;padding:12px}.details-grid{display:grid;gap:10px}.content details{background:#fffdf8;border:1px solid var(--line);border-radius:16px;padding:12px 14px;margin:10px 0}.content summary{font-weight:900;cursor:pointer}.badge{display:inline-flex;margin:3px;padding:5px 9px;border-radius:999px;border:1px solid var(--line);background:white;color:var(--muted);font-size:12px}@media(max-width:980px){.hero,.layout,.artifact-form,.contract{grid-template-columns:1fr}.side{position:static}}

/* Student repair 2026-05-26: prevent mobile/right-column squeeze and long-token overflow. */
html,body{max-width:100%;overflow-x:hidden}.shell,.layout,.hero,.panel,.content,.studentProgressMap,.contract,.nav{min-width:0;max-width:100%}.content,.panel,.card,.sourceBox,.caseBox,.railbox,.contract div{overflow-wrap:anywhere;word-break:break-word}.content pre,.builder pre,.reportBox pre{max-width:100%;overflow:auto}.nav{min-width:0}.pill{white-space:normal}@media(max-width:560px){h1{font-size:clamp(28px,9vw,40px);line-height:1.08;letter-spacing:-.035em}.hero-main{padding:24px}.shell{padding-left:14px;padding-right:14px}.content{padding:22px}.top-inner{padding-left:12px;padding-right:12px}.studentProgressMap .days{max-width:100%}}
/* Student repair 2026-05-26 v2: mobile nav/chip overflow containment. */
@media(max-width:560px){.top-inner{display:flex;flex-direction:column;align-items:stretch}.brand{max-width:100%;overflow-wrap:anywhere}.nav{width:100%;display:flex;flex-wrap:wrap;align-items:flex-start;overflow-x:visible}.pill{max-width:100%;overflow-wrap:anywhere;word-break:break-word}.studentProgressMap{max-width:100%;overflow:hidden}.studentProgressMap .days{display:flex;flex-wrap:wrap;width:100%;overflow:visible}.studentProgressMap .studentDay{min-width:0;max-width:100%;overflow-wrap:anywhere}.contract{grid-template-columns:1fr!important}.contract div{min-width:0}.practiceGrid,.fieldGrid{grid-template-columns:1fr!important}.rail{position:static!important;width:100%;max-width:100%;grid-column:1/-1}.layout{grid-template-columns:1fr!important}}
/* Student repair 2026-05-26 v3: force mobile chip grids to stay inside viewport. */
@media(max-width:560px){.top .nav{display:grid!important;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;width:100%}.top .nav .pill{display:block;text-align:center;padding-left:6px;padding-right:6px}.studentProgressMap .days{display:grid!important;grid-template-columns:repeat(5,minmax(0,1fr));gap:5px;width:100%}.studentProgressMap .studentDay{display:block;text-align:center;padding-left:3px;padding-right:3px;font-size:11px}}

/* Student repair final polish 2026-05-26: density + repair packet scanning. */
.repairGrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px;margin:10px 0}.sourceRepairPacket pre{background:#fff!important;color:#1f2937!important;border:1px solid #d9e2ef;border-radius:10px;padding:12px;white-space:pre-wrap;overflow-wrap:anywhere}.lateSequenceRecap{border-left:4px solid #0ea5e9;background:#f0f9ff;border-radius:12px;padding:12px;margin:12px 0}.trackOptionPacket{border-left-color:#8b5cf6;background:#f7f3ff}@media(max-width:560px){.hero{gap:12px}.hero-main{padding:18px}.lead{font-size:15px}.content h2{font-size:22px;margin-top:26px;padding-top:18px}.beginnerGuide{font-size:.9em;padding:8px 10px}.studentProgressMap{padding:8px}.studentProgressMap b{display:block;margin-bottom:4px}.contract div,.card,.sourceBox,.caseBox{padding:10px}.reportBox code,code{overflow-wrap:anywhere;word-break:break-word}}