:root{--ink:#19313a;--teal:#247c78;--muted:#71807d;--border:#dce5df;--background:#edf2ee;--side:#f8faf6}*{box-sizing:border-box}html,body{margin:0;height:100%;color:var(--ink);font:14px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}body{display:grid;grid-template-columns:252px minmax(0,1fr);overflow:hidden;background:var(--background)}button,select{font:inherit;color:inherit;cursor:pointer}button:focus-visible,select:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #247c7860;outline-offset:3px}#sidebar{background:var(--side);border-right:1px solid var(--border);height:100dvh;padding:24px 19px 18px;overflow:auto}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-size:29px;font-weight:750;letter-spacing:-.06em;line-height:1}.brand svg{width:35px;height:35px;fill:none;stroke:var(--teal);stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.brand small{display:block;letter-spacing:.15em;font-size:7px;font-weight:700;margin-top:8px;color:var(--muted)}.brand-dot{color:#c25e3f}.menu-intro{font-size:13px;color:var(--muted);margin:28px 0 23px;line-height:1.65}.menu-step{display:flex;align-items:center;gap:8px;margin:0 0 8px}.menu-step span{font-size:10px;font-weight:750;color:var(--teal);border:1px solid #d4e3db;border-radius:50%;width:23px;height:23px;display:grid;place-items:center}.menu-step label{font-size:12px;font-weight:650}.menu-step.second{margin-top:22px}select{width:100%;border:1px solid var(--border);border-radius:9px;padding:10px 8px;background:white;font-size:12px}#variantCards{display:grid;gap:9px;margin-top:20px}.variant-card{text-align:left;display:flex;flex-direction:column;background:transparent;border:1px solid var(--border);border-radius:11px;padding:12px 13px;transition:background .15s,border-color .15s,transform .15s}.variant-card:hover{background:white;transform:translateY(-1px)}.variant-card[aria-current="page"]{border-color:var(--teal);background:#edf5ec;box-shadow:inset 3px 0 var(--teal)}.card-top{display:flex;justify-content:space-between;align-items:center;width:100%;margin-bottom:6px}.variant-number{font-size:11px;letter-spacing:.1em;color:var(--muted);font-weight:750}.status-dot{width:5px;height:5px;border-radius:50%;background:#b2c4b8}.variant-card[aria-current="page"] .status-dot{background:var(--teal)}.variant-card b{font-size:15px;font-weight:650;letter-spacing:-.015em}.variant-card>span:not(.card-top){font-size:11px;color:var(--muted);margin-top:3px}.variant-card small{font-size:10px;font-weight:650;color:var(--teal);margin-top:9px}.menu-bottom{margin-top:25px;font-size:11px;color:var(--muted)}.small-badge{display:inline-block;border:1px solid #dce5da;border-radius:30px;padding:4px 8px;font-size:10px;color:#58745e}.menu-bottom p{line-height:1.6;margin:12px 0}.menu-bottom details{border-top:1px solid var(--border);margin-top:18px;padding-top:12px}.menu-bottom summary{cursor:pointer;font-size:11px}.workspace{min-width:0;display:flex;flex-direction:column;height:100dvh}.appbar{height:59px;flex:none;background:#ffffffb8;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:16px;justify-content:space-between;padding:0 25px}.breadcrumb{display:flex;gap:12px;align-items:center;min-width:0;font-size:12px}.breadcrumb>span:first-child{color:var(--muted)}.breadcrumb>span:nth-child(2){color:#adbbb5}.breadcrumb strong{font-weight:650}.type-badge{font-size:10px;color:var(--teal);border:1px solid #d2e2d7;border-radius:30px;padding:3px 9px;background:#f5faf3}.appbar-note{font-size:11px;color:var(--muted)}#lessonArea{flex:1;min-height:0;position:relative}#lessonFrame{display:block;border:0;width:100%;height:100%;background:var(--background)}#menuToggle{display:none;background:white;border:1px solid var(--border);border-radius:8px;padding:7px 10px;font-size:12px}#routeNotice{padding:8px 20px;background:#fff3dc;color:#77572f;font-size:12px}#shade{position:fixed;inset:59px 0 0;background:#19313a55;z-index:19}[hidden]{display:none!important}@media(max-width:760px){body{display:block}#sidebar{position:fixed;top:59px;left:0;height:calc(100dvh - 59px);width:min(300px,86vw);z-index:20;transform:translateX(-102%);transition:transform .2s;box-shadow:10px 0 25px #1a302416}body.menu-open #sidebar{transform:translateX(0)}.brand{font-size:26px}.menu-intro{margin:22px 0 18px}.appbar{padding:0 12px;gap:9px;justify-content:flex-start}#menuToggle{display:block;flex:none}.breadcrumb{font-size:11px;gap:7px}.appbar-note{display:none}.type-badge{padding:3px 6px;font-size:9px}.workspace{height:100dvh}}@media(max-width:390px){.breadcrumb .type-badge{display:none}}

.variant-group h2{font-size:13px;font-weight:650;margin:0;color:var(--ink)}.variant-group p{font-size:10px;color:var(--muted);margin:3px 0 9px}.variant-group+.variant-group{margin-top:10px}.variant-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:5px}.variant-grid button{border:1px solid var(--border);border-radius:7px;background:white;padding:8px 0;font-size:12px;font-weight:650;min-height:36px}.variant-grid button:hover{border-color:var(--teal);background:#f0f7ef}.variant-grid button[aria-current="page"]{background:var(--teal);border-color:var(--teal);color:white;box-shadow:0 2px 7px #247c7820}

.textbook-link{display:flex;flex-direction:column;gap:4px;padding:11px 10px;margin-top:12px;background:white;border:1px solid var(--border);border-radius:8px;color:var(--teal);text-decoration:none}.textbook-link:hover{border-color:var(--teal)}.textbook-link strong{font-size:12px;font-weight:650}.textbook-link span{font-size:10px;line-height:1.5;color:var(--ink)}.textbook-link small{font-size:10px;color:var(--muted)}