:root{background:#f4f7f7;color:#18332f;--accent:#0d675f;--muted:#768983}
body[data-view="library"] .trainer{display:none}
body[data-view="practice"] .library,body[data-view="practice"] .case-section,body[data-view="practice"] .selection-intro,body[data-view="practice"] .launch-dock{display:none}
.topbar{height:68px;border-bottom:0;background:#142e2a;padding-inline:max(24px,calc((100vw - 1240px)/2))}
.brand{font-size:1.18rem}.top-meta{font-size:.78rem}.preview-badge{border:1px solid #506d64;background:#24433b;color:#d1e9df;border-radius:5px;padding:4px 8px;font-size:.69rem}
.workspace{display:grid;grid-template-columns:224px minmax(0,1fr);max-width:1280px;min-height:calc(100vh - 68px);gap:0;padding:30px 20px 160px}
.selection-intro{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center;margin-bottom:28px;padding:4px 0}
.selection-intro .eyebrow{color:#4b8d79;font-size:.67rem}.selection-intro h1{font-size:1.9rem;letter-spacing:-.045em;margin:0}.selection-intro p:last-child{font-size:.88rem;color:var(--muted);margin:10px 0 0}.selection-step{font-size:.78rem;color:#5e776d;background:#e8efec;border:1px solid #dce5e0;border-radius:999px;padding:10px 17px}.selection-step span{padding:0 12px;color:#94aaa0}
.library{grid-column:1;grid-row:2;align-self:start;border:1px solid #e0e8e3;border-radius:16px;padding:22px 16px;box-shadow:none}
.side-heading h1{font-size:1.16rem}.side-heading .eyebrow{display:none}.side-note{margin:14px 0 22px;font-size:.78rem}.count-pill{font-size:.65rem}.page-heading{font-size:.72rem}.side-actions{gap:7px}.side-actions a{display:none}
.case-section{grid-column:2;grid-row:2;padding:4px 0 24px 28px}.section-header{flex-direction:row;align-items:center;margin-bottom:18px;gap:12px}.section-header .eyebrow{display:none}.section-header h2{font-size:1.23rem}.section-subtitle{font-size:.75rem;margin-top:6px}.section-actions{gap:6px}.outline-button{font-size:.73rem;padding:8px 9px}.case-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.case-card{min-height:0;border-radius:13px;box-shadow:none}.case-card-inner{padding:20px 12px 10px}.case-card img{height:120px;width:100%;object-fit:contain}.case-card.current{box-shadow:none;border-color:#b8ddd4}.case-card.selected{background:#fff}.card-bottom{font-size:.75rem;padding-top:12px}.selection-mark{width:22px;height:22px;top:9px;right:9px;font-size:.8rem}.case-view-button{padding:9px;font-size:.71rem;color:#6b8a7e}.source-note{font-size:.72rem}
.launch-dock{position:static;display:block;width:100%;margin:0 0 26px;padding:20px;border:1px solid #dce7e1;background:#fff;border-radius:14px;box-shadow:none}
.launch-summary{flex:0 0 275px;display:flex;align-items:center;justify-content:space-between;gap:15px}.launch-summary strong{display:block;font-size:1.02rem}.launch-summary #launchNote{display:block;margin-top:5px;font-size:.71rem;color:var(--muted)}.favorites-tools{margin:0}.favorites-tools button{white-space:nowrap;width:auto;min-height:34px;font-size:.72rem;padding:6px 10px;border-color:#e6d9b6;background:#fffaf0;border-radius:8px}
.launch-dock .mode-switch{flex:1;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));background:none;padding:0;margin:0;gap:10px}.launch-dock .mode-button{display:flex;gap:10px;align-items:center;justify-content:center;text-align:left;min-height:66px;border:1px solid #d2e4dc;background:#edf6f1;color:#23664f;border-radius:11px;padding:11px 12px;box-shadow:none}.launch-dock .mode-button.active{background:#0d675f;color:white;border-color:#0d675f}.launch-dock .mode-button:hover:not(:disabled){background:#1a7666;color:#fff;border-color:#1a7666;transform:translateY(-1px)}.mode-button strong{font-size:.89rem;display:block}.mode-button small{font-size:.66rem;display:block;margin-top:4px;opacity:.75}.launch-icon{font-size:1.3rem}.launch-arrow{font-size:1rem;margin-left:auto}
body[data-view="practice"] .workspace{display:block;max-width:1140px;padding:24px 24px 30px}
.trainer{border:0;background:none;padding:0;box-shadow:none;outline:none}.trainer-top{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:18px}.back-library{font-size:.79rem;background:none;border:0;color:#598477;padding:3px 0;margin-bottom:10px}.back-library:hover{color:var(--accent)}.practice-title-line{display:flex;gap:12px;align-items:center}.trainer-top h2{font-size:1.45rem}.mode-pill{font-size:.71rem;background:#e0f0e8;color:#1b7659;padding:6px 10px;border-radius:6px;font-weight:700}
.practice-stats{display:flex;margin:0;gap:22px}.practice-stats>div{flex-direction:row;gap:6px;border:0;background:none;padding:0}.practice-stats strong{font-size:1.25rem;color:#254e42}.practice-stats span{font-size:.73rem;color:#7f958b}
.practice-stage{display:grid;grid-template-columns:1.1fr 1fr;min-height:405px;border:1px solid #dfe8e1;background:white;border-radius:22px;overflow:hidden;box-shadow:0 8px 24px #27433504}.practice-visual{padding:24px 32px 26px}.case-ident{margin:0;font-size:.78rem;color:#496c5d;gap:12px}.case-progress{font-size:.69rem;color:#8c9c94}.trainer-cube{height:218px}.cube-figure{width:240px;max-width:calc(100% - 64px)}.trainer-cube img{width:222px;height:208px}.favorite-button{top:0;right:-38px;width:38px;height:38px;font-size:1.45rem;box-shadow:0 3px 10px #27433509}.setup-box{border-color:#e4ece7;background:#f6f9f7;padding:13px 15px;border-radius:11px}.setup-label{font-size:.64rem;color:#5c8370}.setup-label span:last-child{font-size:.65rem;color:#8ca292}.setup-box .algorithm-text{font-size:.9rem;color:#315044;line-height:1.65;font-weight:600;margin-top:5px}
.practice-timing{padding:38px 36px 28px;border-left:1px solid #e8eeea;display:flex;flex-direction:column;justify-content:center;text-align:center;background:linear-gradient(160deg,#fff,#f8fbf8)}.timing-eyebrow{font-size:.74rem;color:#8ca295;margin:0 0 9px}.timer-row{display:flex;flex-direction:column;padding:0;border:0;gap:16px}.timer-label{display:none}.timer{font-size:4.3rem;font-weight:650;letter-spacing:-.055em;line-height:1.18;color:#14372b}.timer-button{width:100%;min-height:54px;background:#0d675f;color:#fff;border:1px solid #0d675f;font-size:1rem;border-radius:11px}.timer-button:hover:not(:disabled){background:#168078}.timer-button.running{background:#d66347;color:white;border-color:#d66347}.timer-instruction{font-size:.71rem;color:#849a8e;margin:11px 0 0}.last-solve-time{font-size:.76rem;background:none;padding:0;color:#2d8467;margin:10px 0 0;min-height:18px}.practice-navigation{display:grid;grid-template-columns:1fr 1.35fr;gap:10px;margin-top:23px}.practice-navigation button{min-height:45px;border-radius:9px;font-size:.81rem}.practice-navigation #previousButton{border:1px solid #dce6df;background:white;color:#6b8476}.practice-navigation #nextButton{background:#e4f0e9;border-color:#d2e6d9;color:#26694d}.practice-navigation #nextButton:hover{background:#d5e8dd}.practice-timing #currentButton{background:none;border:0;color:#6f9080;min-height:28px;font-size:.7rem;margin-top:9px;padding:4px}.practice-timing #currentButton:disabled{opacity:.3}
.formula-details{margin-top:16px;border:1px solid #e0e8e3;background:white;border-radius:13px;padding:0 19px}.formula-details summary{display:flex;align-items:center;gap:10px;list-style:none;cursor:pointer;padding:15px 0;font-size:.83rem;color:#365e4b;font-weight:700}.formula-details summary::-webkit-details-marker{display:none}.formula-details summary:after{content:'+';margin-left:auto;font-size:1.25rem;font-weight:400}.formula-details[open] summary:after{content:'−'}.formula-hint{font-size:.7rem;color:#95a399;font-weight:400}.formula-panel{margin:0 0 16px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.formula-panel>div{background:#f5f8f6}.formula-panel p{font-size:.89rem;font-weight:600;line-height:1.7}.formula-kicker.secondary{color:#527bb0}.practice-utilities{display:flex;align-items:center;justify-content:center;gap:22px;margin-top:15px}.practice-utilities button{background:none;border:0;padding:4px 0;font-size:.73rem;font-weight:500;color:#779082}.practice-utilities #clearPracticeButton{color:#b4847a}.practice-utilities button:hover:not(:disabled){text-decoration:underline}.keyboard-tip{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;font-size:.68rem;margin-top:18px;color:#8ea095}.keyboard-tip kbd{font:inherit;border:1px solid #d7e2da;border-bottom-width:2px;border-radius:4px;padding:2px 5px;background:#fff;margin-right:3px;color:#597664}.completion-state,.trainer-empty{background:white;border:1px solid #dfe8e1;border-radius:20px;padding:65px 20px}.case-preview{width:min(520px,calc(100% - 28px));max-height:calc(100dvh - 40px);overflow:auto;padding:22px;border:1px solid #dfe8e1;border-radius:18px;color:#264b3c;box-shadow:0 15px 70px #162e292e}.case-preview::backdrop{background:#12342973;backdrop-filter:blur(4px)}.preview-dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:15px}.preview-dialog-heading h2{font-size:1.05rem;margin:0}.preview-dialog-heading button{width:32px;height:32px;border:0;background:#edf2ee;border-radius:50%;font-size:1.3rem;color:#476b56}.case-preview img{display:block;width:190px;height:190px;object-fit:contain;margin:12px auto}.preview-setup,.preview-algorithms>div{border-radius:10px;padding:12px 14px;background:#f4f8f5;margin-top:10px}.case-preview span{font-size:.69rem;color:#668572;font-weight:700}.case-preview p{font-size:.88rem;font-weight:600;line-height:1.7;margin:6px 0 0;overflow-wrap:anywhere}.case-preview #previewSelect{display:block;width:100%;margin-top:18px}
@media(min-width:681px) and (max-width:1050px){.case-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.workspace{grid-template-columns:190px minmax(0,1fr)}.case-section .section-header{flex-direction:column;align-items:start}.launch-summary{flex:0 0 215px}.launch-summary .favorites-tools{display:none}.practice-visual{padding:22px}.practice-timing{padding:28px 24px}.timer{font-size:3.5rem}}
@media(max-width:680px){.topbar{height:58px;padding:0 17px}.brand{font-size:1rem;gap:9px}.brand-mark{width:24px;height:24px}.top-meta{gap:8px}.top-meta .preview-badge{display:inline-block;font-size:.61rem;padding:3px 6px}.top-meta .meta-dot,.top-meta>span:last-child{display:none}.top-meta .home-link{font-size:.7rem}.workspace{display:flex;flex-direction:column;padding:22px 16px 160px;min-height:calc(100vh - 58px)}.selection-intro{margin-bottom:18px;padding:0;display:block}.selection-intro h1{font-size:1.5rem}.selection-intro p:last-child{font-size:.76rem;margin-top:8px;line-height:1.6}.selection-step{display:none}.library{order:0;padding:16px 14px;margin-bottom:21px;border-radius:13px}.side-heading h1{font-size:1rem}.side-note{font-size:.72rem;line-height:1.5;margin:9px 0 15px}.group-list{display:flex}.group-button{flex:0 0 59px;min-height:36px;font-size:.78rem}.group-actions button{font-size:.66rem;min-height:30px}.page-list{display:flex}.page-button{flex:0 0 42px;min-height:35px;padding:6px}.side-actions{gap:18px;margin-top:7px}.text-button{font-size:.74rem}.page-heading-secondary{margin-top:12px}.case-section{order:1;padding:0}.section-header{align-items:start;gap:11px;flex-direction:column;margin-bottom:14px}.section-header h2{font-size:1.13rem}.section-subtitle{font-size:.7rem}.section-actions{width:100%}.section-actions button{flex:1;font-size:.7rem;padding:7px}.case-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.case-card img{height:111px}.case-card-inner{padding:17px 11px 9px}.card-bottom{font-size:.73rem}.case-view-button{font-size:.69rem;padding:8px}.launch-dock{width:100%;left:0;transform:none;bottom:0;border-radius:16px 16px 0 0;padding:12px 15px max(14px,env(safe-area-inset-bottom));gap:10px;flex-direction:column}.launch-summary{width:100%;flex:0 0 auto;gap:10px}.launch-summary>div:first-child{display:flex;align-items:center;gap:9px}.launch-summary strong{font-size:.8rem}.launch-summary #launchNote{font-size:.62rem;margin:0}.favorites-tools button{font-size:.64rem;min-height:28px;padding:5px 7px}.launch-dock .mode-switch{width:100%;gap:7px}.launch-dock .mode-button{min-height:59px;justify-content:center;padding:8px 3px;gap:0}.mode-button strong{font-size:.78rem}.mode-button small{font-size:.58rem}.launch-icon,.launch-arrow{display:none}body[data-view="practice"] .workspace{padding:17px 14px 22px}.trainer-top{margin-bottom:14px;gap:10px}.back-library{font-size:.72rem;margin-bottom:8px}.trainer-top h2{font-size:1.2rem}.practice-title-line{gap:7px}.mode-pill{font-size:.62rem;padding:5px 7px}.practice-stats{gap:10px}.practice-stats>div{flex-direction:column-reverse;gap:1px}.practice-stats strong{font-size:1.05rem}.practice-stats span{font-size:.61rem}.practice-stage{display:flex;flex-direction:column;border-radius:17px;min-height:0}.practice-visual{padding:16px 18px 13px}.case-ident{font-size:.71rem;gap:6px}.case-progress{font-size:.6rem}.trainer-cube{height:160px}.cube-figure{width:170px;max-width:calc(100% - 70px)}.trainer-cube img{width:165px;height:150px}.favorite-button{width:32px;height:32px;font-size:1.2rem;right:-37px;top:6px}.setup-box{padding:9px 12px;border-radius:8px}.setup-label{font-size:.6rem}.setup-label span:last-child{font-size:.61rem}.setup-box .algorithm-text{font-size:.77rem;line-height:1.6;margin-top:3px}.practice-timing{padding:15px 18px 12px;border-left:0;border-top:1px solid #e8eeea}.timing-eyebrow{display:none}.timer-row{gap:9px}.timer{font-size:2.9rem;line-height:1.1}.timer-button{min-height:44px;border-radius:9px;font-size:.87rem}.timer-instruction{font-size:.64rem;margin-top:7px}.last-solve-time{font-size:.68rem;margin-top:5px;min-height:14px}.practice-navigation{margin-top:12px;gap:8px}.practice-navigation button{min-height:38px;padding:8px;font-size:.76rem}.practice-timing #currentButton{font-size:.63rem;margin-top:5px;min-height:24px}.formula-details{margin-top:12px;padding:0 14px;border-radius:10px}.formula-details summary{font-size:.76rem;padding:12px 0}.formula-hint{font-size:.61rem}.formula-panel{grid-template-columns:1fr}.practice-utilities{margin-top:10px;gap:18px}.practice-utilities button{font-size:.66rem}.keyboard-tip{gap:10px;margin-top:12px;font-size:.58rem}}
@media(max-width:370px){.top-meta .home-link{display:none}.case-progress{max-width:160px;text-align:right}.launch-summary #launchNote{display:none}.timer{font-size:2.6rem}.practice-visual{padding:13px}.trainer-cube{height:140px}.trainer-cube img{height:134px;width:150px}}
@media(max-width:680px){.library{align-self:stretch;width:100%;min-width:0}.page-list,.group-list{max-width:100%;min-width:0}.selection-intro,.case-section{min-width:0}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.previous-case-card{display:grid;grid-template-columns:78px minmax(0,1fr);gap:14px;align-items:center;text-align:left;min-height:96px;margin-top:18px;padding:9px 12px;border:1px solid #e1e9e3;border-radius:12px;background:#fff}
.previous-case-figure{height:76px;display:grid;place-items:center;background:#f4f8f5;border-radius:9px}
.previous-case-figure img{width:70px;height:70px;object-fit:contain;display:block}
.previous-case-figure>span{color:#bdcdc3;font-size:1.6rem}
.previous-case-kicker{display:block;font-size:.66rem;color:#899b90;letter-spacing:.05em;margin-bottom:4px}
.previous-case-info strong{display:block;color:#466652;font-size:.85rem;font-weight:650}
.previous-case-info>p:not(.last-solve-time){font-size:.67rem;color:#92a296;line-height:1.5;margin:5px 0 0}
.previous-case-info .last-solve-time{font-size:.69rem;margin:5px 0 0;min-height:0;text-align:left}
.previous-case-card+.practice-navigation{margin-top:14px}
.completion-state .previous-case-card{max-width:360px;margin:20px auto 24px}
@media(max-width:680px){.previous-case-card{grid-template-columns:57px minmax(0,1fr);gap:11px;min-height:71px;margin-top:11px;padding:7px 10px;border-radius:9px}.previous-case-figure{height:55px;border-radius:6px}.previous-case-figure img{width:52px;height:52px}.previous-case-kicker{font-size:.59rem;margin-bottom:3px}.previous-case-info strong{font-size:.74rem}.previous-case-info>p:not(.last-solve-time){font-size:.6rem;margin-top:3px}.previous-case-info .last-solve-time{font-size:.62rem;margin-top:3px}.previous-case-card+.practice-navigation{margin-top:10px}}

/* Inline practice launcher: part of the case list, never a floating toolbar. */
body[data-view="library"] .workspace{padding-bottom:40px}
.launch-summary{flex:none;width:100%;margin-bottom:16px}
.launch-summary #launchNote{font-size:.73rem}
.launch-summary .favorites-tools{display:block}
.launch-dock .mode-switch{width:100%;flex:none}
.launch-dock .mode-button{min-height:70px;justify-content:flex-start;padding:14px 16px}
@media(min-width:681px) and (max-width:1050px){
  .launch-dock{padding:16px}
  .launch-dock .mode-button{gap:7px;padding:12px 10px}
  .launch-icon{font-size:1.1rem}
  .launch-arrow{display:none}
}
@media(max-width:680px){
  body[data-view="library"] .workspace{padding-bottom:28px}
  .launch-dock{position:static;left:auto;bottom:auto;transform:none;width:100%;margin-bottom:22px;padding:16px 12px;border-radius:13px}
  .launch-summary{margin-bottom:14px}
  .launch-summary>div:first-child{display:block}
  .launch-summary #launchNote{display:block;margin-top:5px;font-size:.63rem}
  .launch-dock .mode-button{min-height:62px;padding:10px 3px;justify-content:center}
}