:root{--ink:#233c35;--muted:#718078;--green:#285e50;--soft:#e8eee7;--paper:#f7f8f3;--line:#dfe5da;--gold:#b9904d;--serif:"Noto Serif SC","Songti SC","SimSun",serif;--sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:95px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.7 var(--sans);padding-bottom:100px}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #bb9b5c;outline-offset:4px}a{color:inherit}button{border:0}button:disabled{opacity:.3;cursor:default}.masthead{height:80px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 44px;background:#f7f8f3f5;position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font:700 23px var(--serif);letter-spacing:2px}.brandmark{background:var(--green);color:#f0e7c9;border-radius:13px 13px 13px 2px;font:30px/44px var(--serif);width:44px;text-align:center}.brand-sub{font:400 12px var(--sans);letter-spacing:2px;border-left:1px solid #cbd3c7;margin-left:16px;padding-left:16px;color:var(--muted)}.mast-right{display:flex;align-items:center;gap:28px}.world{font-size:10px;letter-spacing:2px;color:#8a948a}.quiet{background:transparent;border:1px solid var(--line);border-radius:8px;min-height:38px;min-width:40px}.quiet span{font-size:11px}.shell{display:grid;grid-template-columns:248px minmax(0,1060px);max-width:1440px;margin:auto;gap:44px;padding:0 44px}.sidebar{position:sticky;top:80px;height:calc(100dvh - 175px);overflow:auto;scrollbar-width:thin;padding:32px 18px 20px 0;border-right:1px solid var(--line)}.side-intro{padding:0 12px 24px}.eyebrow{font-size:9px;letter-spacing:2.2px;font-weight:600;color:var(--gold)}.side-intro h2{font:600 20px var(--serif);margin:10px 0 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8px;font-size:10px}.branch-links{gap:7px;grid-template-columns:repeat(2,1fr)}.branch-link{font-size:11px;padding:10px}.viewer-tip{font-size:9px}.close{width:34px;height:34px}.large-type .step p{font-size:16px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
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/* Layout refinement: shared alignment, consistent cards and readable typography. */
:root{--line:#dce4da;--muted:#6c7d70}body{background:#f5f7f1}.masthead{background:#f9faf6f5}.mast-right{gap:22px}.quiet{display:inline-flex;justify-content:center;align-items:center;gap:3px;min-width:42px;min-height:42px}.sidebar{scrollbar-color:#cbd5c6 transparent}.nav-item{min-height:42px;line-height:22px}.side-intro h2{line-height:1.5}.stage-heading{margin-top:27px;margin-bottom:22px}.stage-desc{line-height:1.8}.tags{align-items:center;gap:8px}.tag{display:inline-flex;align-items:center;min-height:27px;line-height:18px;padding:3px 9px;background:#f9fbf6}.goal{align-items:baseline;padding:14px 17px;gap:14px}.goal-label{white-space:nowrap;line-height:22px;margin:0}.goal p{line-height:22px}.content-grid{align-items:start;gap:22px}.map-panel{box-shadow:0 4px 18px #304a3510}.panel-top{height:56px;padding:10px 16px;gap:12px}.panel-top b{font-size:13px;line-height:22px}.panel-top button{min-height:36px;padding:6px 10px;white-space:nowrap;line-height:20px}.map-open{padding:12px}.map-caption{min-height:38px;padding:6px 16px;font-size:11px;line-height:18px}.map-caption span:first-child{min-width:0}.thumbs{padding:4px 14px 15px;gap:9px}.thumb{flex-basis:86px;min-height:74px;padding:6px}.thumb img{height:43px}.thumb span{font-size:10px;line-height:18px}.instructions{background:#fff;border:1px solid var(--line);border-radius:12px;padding:17px 18px 18px;box-shadow:0 4px 18px #304a3508}.section-title{font-size:14px;line-height:22px;min-height:22px;margin-bottom:23px}.step{grid-template-columns:25px minmax(0,1fr);gap:11px;margin-bottom:22px}.step-number{width:25px;height:25px;line-height:23px;margin-top:0;font-size:11px}.step h3{font-size:14px;line-height:25px;margin:0 0 6px}.step p{font-size:13px;line-height:1.9;color:#687568;overflow-wrap:anywhere}.step:last-of-type{margin-bottom:0}.note{margin-top:21px;padding:13px 14px}.note p{font-size:12px;line-height:1.9}.note b{font-size:12px;line-height:20px}.attribution{line-height:1.9}.bottom-inner{max-width:1440px;padding:0 44px 0 336px;gap:20px;height:80px}.page-nav{height:58px;padding:8px 12px;line-height:20px}.page-nav small{line-height:17px}.page-nav b{font-size:13px;line-height:22px}.directory{min-height:44px;justify-content:center;line-height:20px}.mobile-only{display:none}.large-type .step h3{font-size:17px;line-height:1.5}.large-type .step p{font-size:16px}.large-type .goal p{font-size:16px}
/* Sealed room companion. */
.seal-tool{background:#edf3eb;border:1px solid #d2dfce;border-radius:14px;padding:23px;margin-bottom:30px;scroll-margin-top:100px}.solver-heading{display:flex;justify-content:space-between;align-items:center;gap:14px}.solver-heading .eyebrow{color:#71896b;font-size:9px;letter-spacing:2px}.solver-heading h2{font-size:21px;line-height:30px;font-weight:700;margin:4px 0}.solver-heading h2>span{font-size:10px;color:#688062;line-height:20px;display:inline-block;padding:0 7px;border:1px solid #cddbc5;border-radius:4px;vertical-align:middle;margin-left:7px;font-family:var(--sans);font-weight:500}.guide-shortcut{font-size:11px;text-decoration:none;color:var(--green);white-space:nowrap;align-self:center;min-height:40px;display:flex;align-items:center}.solver-lead{font-size:12px;color:#7a8972;margin:6px 0 20px;line-height:1.9}.solver-grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,1fr);gap:16px}.trial-card,.feedback-card{background:#fff;border:1px solid #dae3d4;border-radius:11px;min-width:0;padding:18px}.trial-top{display:flex;justify-content:space-between;align-items:center;gap:10px;min-height:28px}.trial-top h3{font-size:15px;line-height:24px;margin:0;font-weight:650}.attempt-badge{font-size:10px;white-space:nowrap;background:#f1f5ee;color:#829177;padding:4px 7px;border-radius:4px;line-height:18px;flex-shrink:0}.platform-order{font-size:11px;color:#8b9880;margin:7px 0 18px}.platforms{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.platform{position:relative;background:#f5f7f2;border:1px solid #e6ecdf;border-radius:8px;text-align:center;padding:12px 5px 17px;display:flex;flex-direction:column;align-items:center;min-height:137px}.platform.occupied{background:#edf4e9;border-color:#d5e2ca}.platform-name{font-size:11px;line-height:20px;color:#78876d;white-space:nowrap}.platform-value{font-size:35px;font-weight:650;line-height:46px;color:var(--green);font-variant-numeric:tabular-nums;display:flex;gap:4px;align-items:baseline;justify-content:center}.platform-value small{font-size:11px;font-weight:400;color:#86947b;line-height:20px}.people{display:flex;justify-content:center;gap:2px;height:17px;margin-top:3px;width:100%}.people svg{width:11px;height:15px;fill:#73966b;flex-shrink:0}.platform-floor{position:absolute;bottom:7px;left:7px;right:7px;border-radius:4px;height:4px;background:#d8e4d0}.occupied .platform-floor{background:#b2caaa}.trial-copy{border-top:1px solid #e9ede4;margin-top:15px;padding-top:13px;display:flex;align-items:center;justify-content:space-between;gap:12px}.trial-copy small{font-size:10px;color:#8e9c82;display:block;line-height:17px}.trial-copy strong{font:600 23px/32px ui-monospace,monospace;letter-spacing:2px}.copy-trial{background:var(--green);color:#fff;border-radius:6px;min-height:40px;padding:8px 13px;font-size:11px;white-space:nowrap}.movement{font-size:11px;color:#718469;line-height:1.9;margin-top:12px;min-height:22px}.movement.finished{color:var(--green);font-weight:500}.feedback-title{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:28px}.feedback-title h3{font-size:14px;line-height:24px;margin:0}.feedback-title>span{font-size:9px;color:#8e9b83;white-space:nowrap}.feedback-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:15px}.feedback-options button{display:flex;flex-direction:column;align-items:center;justify-content:center;border:1px solid #dce4d7;border-radius:7px;background:#f6f8f3;min-height:87px;padding:8px 3px;gap:4px;transition:background .15s,transform .15s}.feedback-options button:not(:disabled):hover{background:#e9f1e2;border-color:#a7c29b;transform:translateY(-1px)}.feedback-options strong{font:600 26px/32px var(--sans);color:#44613d}.feedback-options span{font-size:10px;white-space:nowrap;line-height:18px;color:#7b8b70}.feedback-options .success-choice{background:#edf5e9;border-color:#cfdfc5}.success-choice strong,.success-choice span{color:#4a7840}.feedback-help{font-size:10px;line-height:1.9;color:#8a977e;margin:11px 0 15px}.feedback-help b{font-weight:500;color:#7a866b}.solver-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}.solver-actions button{min-height:39px;border:1px solid #dce4d6;border-radius:6px;background:#fff;font-size:11px;color:#748669}.solver-actions button:not(:disabled):hover{background:#eff4e9}.round-warning{font-size:10px;color:#939f87;line-height:1.9;margin:10px 0 13px}.solver-status{display:flex;align-items:center;gap:8px;border-top:1px solid #e7eddf;padding-top:11px;font-size:11px;color:#7c8f70;line-height:20px}.status-dot{height:6px;width:6px;background:#9ab48b;border-radius:50%;flex-shrink:0}.solver-status b{color:var(--green)}.solver-status.is-solved{color:var(--green)}.solver-error{color:#a24c3b;background:#fff2ed;border:1px solid #edcfc3;border-radius:6px;padding:10px;font-size:11px;line-height:1.9;margin:10px 0}.reset-confirm{background:#fff7e8;border:1px solid #e3d7b8;border-radius:6px;padding:10px;display:flex;gap:9px;align-items:center;flex-wrap:wrap;margin-top:10px;font-size:10px}.reset-confirm span{flex-basis:100%}.reset-confirm button{border-radius:4px;background:#fff;border:1px solid #dbcfb1;min-height:32px;font-size:10px;padding:4px 10px}.solver-record{background:#ffffffb8;border:1px solid #dbe4d3;border-radius:8px;margin-top:15px;overflow:hidden}.record-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;background:transparent;width:100%;padding:12px 14px;text-align:left;font-size:12px;min-height:46px}.record-heading>span:last-child{font-size:10px;color:#839477}.record-heading b{font-weight:500;display:inline-block;border-radius:4px;background:#edf3e7;margin-left:5px;padding:0 6px;color:#7d916e;font-size:10px}.history-list{border-top:1px solid #e5ebde;padding:0 14px}.history-row{display:grid;grid-template-columns:28px 1fr auto;align-items:center;gap:10px;padding:10px 0;min-height:44px;border-bottom:1px solid #e7ecdf}.history-row:last-child{border-bottom:0}.history-no{font:10px ui-monospace,monospace;color:#a0ab95}.history-row strong{font:500 13px ui-monospace,monospace;letter-spacing:1px}.feedback-tag{font-size:10px;color:#8a917c;background:#f0f2e9;padding:3px 8px;border-radius:4px}.feedback-tag.f1{background:#e9f1e1;color:#6c8957}.feedback-tag.f3{background:#dfedda;color:#47743a}.history-empty{font-size:11px;color:#909d83;padding:8px 0}.candidate-details{margin-top:12px;font-size:11px;color:#8a997d}.candidate-details summary{cursor:pointer;min-height:37px;line-height:21px;padding:8px 0;list-style-position:inside}.candidate-details summary span{float:right;font-size:10px;color:#8fa17e}.candidate-details>p{font-size:10px;margin:6px 0 12px}.candidate-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:7px}.candidate-grid button{font:11px/20px ui-monospace,monospace;min-height:38px;background:#f8fbf4;border:1px solid #d6e1cb;border-radius:5px;white-space:nowrap;padding:6px 1px;color:#638255}.candidate-grid button.eliminated{background:#edf0e8;border-color:#e0e5d8;color:#a9b0a0}.candidate-grid button.chosen{border-color:var(--green);color:var(--green);box-shadow:inset 0 0 0 1px var(--green);background:#e4f0dc}.candidate-grid button.eliminated.chosen{border-color:#ae8766;background:#fff1df;color:#97734d}.large-type .solver-lead,.large-type .platform-order,.large-type .feedback-help{font-size:14px}.large-type .trial-top h3{font-size:17px}.large-type .platform-name{font-size:13px}
@media(max-width:1150px){.bottom-inner{padding-left:261px;padding-right:25px}.content-grid{grid-template-columns:minmax(0,1fr)}.instructions{margin-top:0}.solver-grid{grid-template-columns:1fr}.seal-tool{padding:20px}.trial-card,.feedback-card{padding:18px}.candidate-grid{grid-template-columns:repeat(5,minmax(0,1fr))}}
@media(max-width:760px){.mobile-only{display:inline-flex}.masthead{height:68px}.shell{padding:0 18px}.stage-heading{margin-top:22px;padding-right:44px}.chapter-decoration{font-size:52px;top:4px}.stage-heading .eyebrow{letter-spacing:1.6px}h1{font-size:31px;line-height:1.45}.stage-desc{font-size:12px}.tags{gap:6px}.tag{font-size:10px;min-height:25px;line-height:17px;padding:3px 8px}.goal{display:block;padding:12px 14px;margin-bottom:20px}.goal-label{font-size:10px;line-height:19px;margin-bottom:4px}.goal p{font-size:12px;line-height:1.85}.panel-top{height:53px;padding:8px 13px}.panel-top b{font-size:12px}.panel-top button{font-size:10px;min-height:37px}.map-open{padding:9px}.map-open img{height:285px}.map-caption{padding:7px 13px;font-size:10px;min-height:39px}.thumbs{padding:3px 11px 13px}.thumb{flex-basis:80px}.instructions{padding:17px 15px;border-radius:11px}.section-title{margin-bottom:19px}.step{gap:10px;margin-bottom:20px}.step h3{font-size:14px;line-height:25px}.step p{font-size:13px}.note p{font-size:12px}.bottom-inner{height:77px;padding:0 10px;gap:6px}.page-nav{padding:5px 4px;gap:5px;height:58px}.page-nav b{font-size:11px;line-height:20px}.page-nav small{font-size:9px;line-height:16px}.page-nav .arrow{font-size:17px;flex-shrink:0}.directory{font-size:11px;padding:10px 12px;gap:5px}.seal-tool{padding:16px 13px;border-radius:12px;margin-bottom:24px}.solver-heading{gap:7px;align-items:flex-start}.solver-heading h2{font-size:18px;line-height:29px;margin-top:3px}.solver-heading h2>span{font-size:9px;padding:0 5px;margin-left:4px;line-height:18px}.solver-heading .eyebrow{font-size:8px;letter-spacing:1.6px}.guide-shortcut{font-size:10px;min-height:39px;align-self:flex-end;margin-bottom:2px}.solver-lead{font-size:11px;margin:7px 0 15px}.solver-grid{gap:12px}.trial-card,.feedback-card{padding:14px 12px;border-radius:9px}.trial-top{gap:6px;align-items:flex-start}.trial-top h3{font-size:14px;line-height:25px;max-width:calc(100% - 65px)}.attempt-badge{font-size:9px;padding:3px 6px;line-height:19px}.platform-order{font-size:10px;margin:7px 0 14px}.platforms{gap:7px}.platform{min-height:124px;padding:9px 3px 15px;border-radius:7px}.platform-name{font-size:10px;line-height:20px}.platform-value{font-size:34px;line-height:44px;gap:3px}.platform-value small{font-size:10px}.people{gap:1px}.people svg{width:10px;height:14px}.trial-copy{margin-top:13px;padding-top:10px}.trial-copy strong{font-size:22px;line-height:32px;letter-spacing:1px}.copy-trial{font-size:11px;padding:8px 11px;min-height:40px}.movement{font-size:11px;min-height:21px}.feedback-title h3{font-size:14px}.feedback-title>span{font-size:9px}.feedback-options{gap:6px;margin-top:12px}.feedback-options button{min-height:80px;gap:3px;border-radius:6px}.feedback-options strong{font-size:25px;line-height:30px}.feedback-options span{font-size:10px}.feedback-help{font-size:10px;margin:10px 0 13px}.solver-actions button{min-height:41px;font-size:11px}.round-warning{font-size:10px;margin:9px 0 12px}.solver-status{font-size:11px}.candidate-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}.candidate-grid button{font-size:10px;min-height:39px;line-height:20px}.candidate-details summary{font-size:10px;line-height:20px}.candidate-details summary span{font-size:9px}.record-heading{font-size:11px;min-height:46px;padding:10px 12px}.history-list{padding:0 12px}.history-row strong{font-size:12px}.feedback-tag{font-size:9px;padding:3px 6px}.history-row{gap:5px;grid-template-columns:23px 1fr auto}.solver-error{font-size:11px}.large-type .platform-name{font-size:11px}.large-type .solver-lead,.large-type .platform-order,.large-type .feedback-help{font-size:13px}.large-type .trial-top h3{font-size:15px}}
@media(max-width:355px){.solver-heading h2>span{display:none}.guide-shortcut{font-size:9px}.trial-top h3{font-size:12px}.feedback-title>span{font-size:8px}.feedback-options span{font-size:9px}.candidate-details summary span{float:none;display:block;padding-left:13px}.platform-name{font-size:9px}.people svg{width:9px}.trial-card,.feedback-card{padding:12px 10px}.seal-tool{padding:13px 10px}}
.trial-card{scroll-margin-top:82px}#seal-guide{scroll-margin-top:95px}@media(max-width:760px){.trial-card{scroll-margin-top:80px}}
.trial-card,#seal-guide{scroll-margin-top:0}