:root{--bg:#f4f7fb;--panel:#fff;--ink:#12233a;--muted:#67758b;--line:#dbe4f0;--accent:#1769d2;--accent-dark:#0d50aa;--soft:#eaf2ff;--success:#278c58;--radius:16px;--shadow:0 14px 42px rgba(18,35,58,.07)}*{box-sizing:border-box}html{color-scheme:light}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input{font:inherit}a{color:inherit}.app-shell{min-height:100vh}.topbar{height:74px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;border-bottom:1px solid var(--line);background:#fff}.brand{display:flex;align-items:center;gap:11px;text-decoration:none}.brand>span:last-child{display:flex;flex-direction:column}.brand-mark{width:40px;height:40px;display:grid;place-items:center;border-radius:13px;background:var(--accent);color:#fff;font-size:21px;font-weight:800}.brand strong{font-size:21px;line-height:1.1;letter-spacing:-.5px}.brand small{margin-top:3px;color:var(--muted);font-size:8px;letter-spacing:1.7px}.quiet-button{border:0;background:none;color:var(--muted);cursor:pointer}.content{width:min(100%,760px);margin:0 auto;padding:30px 28px 110px}.eyebrow{color:var(--accent);font-size:11px;letter-spacing:1.6px}.content>h1,.detail-heading h1{margin:5px 0 2px;font-size:31px;line-height:1.15;letter-spacing:-1px}.lead{margin:5px 0 23px;color:var(--muted)}.search{margin:25px 0 15px}.search label{display:block;margin-bottom:7px;color:var(--muted);font-size:12px}.search>div{display:flex;gap:8px}.search input,.login-form input{width:100%;min-height:50px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);outline:none}.search input:focus,.login-form input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(23,105,210,.1)}.search button,.primary{min-height:50px;padding:0 17px;border:0;border-radius:12px;background:var(--accent);color:#fff;font-weight:700;cursor:pointer}.search button:hover,.primary:hover{background:var(--accent-dark)}.list{overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow)}.exercise-row{display:flex;align-items:center;gap:14px;min-height:108px;padding:17px 19px;border-bottom:1px solid var(--line);text-decoration:none}.exercise-row:last-child{border-bottom:0}.exercise-row:hover{background:#f9fbfe}.exercise-copy{display:flex;min-width:0;flex:1;flex-direction:column}.exercise-copy strong{font-size:17px}.exercise-copy small{color:var(--muted)}.exercise-copy .station,.station{color:var(--accent)}.exercise-copy .load-hint{margin-top:5px;color:#43546b;font-size:12px}.arrow{color:var(--accent);font-size:28px}.empty{padding:35px 20px;color:var(--muted);text-align:center}.bottom-nav{position:fixed;right:0;bottom:0;left:0;z-index:4;display:grid;grid-template-columns:repeat(3,1fr);padding:8px max(12px,calc((100% - 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