:root{color-scheme:light;--ink:#173c3d;--muted:#5c7372;--accent:#14665c;--line:#dce7e2;--paper:#f6f8f3}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:inherit}.topbar{max-width:1100px;margin:auto;padding:24px 30px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{text-decoration:none;font-size:24px;font-weight:800;letter-spacing:-1px}.brand span{font-size:13px;font-weight:500;letter-spacing:0;margin-left:14px;color:var(--muted)}.library{max-width:1000px;margin:54px auto;padding:0 30px}.eyebrow{font-size:12px;letter-spacing:.17em;font-weight:750;color:var(--accent)}h1{font-size:clamp(32px,5vw,52px);line-height:1.15;letter-spacing:-.04em;margin:14px 0}p{margin:8px 0}.intro{font-size:18px;color:var(--muted)}.summary{margin:24px 0;font-size:16px;font-weight:650;color:var(--accent)}.instructions{background:#eaf0e8;border-left:3px solid var(--accent);padding:20px 24px;margin:32px 0;color:#344e4c;font-size:14px}.instructions strong{font-size:16px}.search-label{display:block;font-size:13px;font-weight:650;margin-bottom:7px}input{font:inherit;padding:12px 14px;border:1px solid #b8ccc2;border-radius:7px;background:white;color:var(--ink);width:100%;min-width:0}input:focus-visible,button:focus-visible,a:focus-visible{outline:3px solid #79b8a2;outline-offset:3px}#search{max-width:500px}#status{font-size:14px;color:var(--muted)}.block{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:32px 0}.block-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:20px 24px;background:#f0f4ee;border-bottom:1px solid var(--line)}h2{font-size:18px;margin:0;line-height:1.4}.block-heading span{color:var(--muted);font-size:12px;white-space:nowrap}.lesson{display:flex;gap:18px;align-items:center;padding:20px 24px;border-bottom:1px solid var(--line)}.lesson:last-child{border-bottom:0}.number{color:#829b8f;font-size:16px;font-weight:700;font-variant-numeric:tabular-nums}.lesson-info{flex:1;min-width:0}h3{font-size:15px;font-weight:600;line-height:1.45;margin:0;overflow-wrap:anywhere}.lesson-info p{font-size:12px;color:var(--muted);margin:5px 0 0}.download,button{font:inherit;border:0;border-radius:6px;background:var(--accent);color:#fff;padding:10px 15px;font-size:13px;font-weight:650;white-space:nowrap;text-decoration:none;cursor:pointer}.download:hover,button:hover{background:#104e46}.quiet{background:transparent;color:var(--muted);border:1px solid var(--line)}.quiet:hover{background:#e7eee6;color:var(--ink)}footer{max-width:1000px;margin:50px auto;padding:0 30px 30px;color:var(--muted);font-size:12px}.login{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:44px;width:100%;max-width:440px;box-shadow:0 20px 60px #193c3a08}.login-card h1{font-size:40px}.login-card .intro{font-size:16px;margin-bottom:28px}.login-card label{display:block;font-size:13px;font-weight:650;margin:18px 0 7px}.login-card button{display:flex;justify-content:space-between;width:100%;margin-top:24px;font-size:15px;padding:13px 15px}.hint{font-size:12px;color:var(--muted);margin-top:22px}.error{color:#9f332c;font-size:14px;margin-top:18px}@media(max-width:620px){.topbar{padding:18px 20px}.brand span{font-size:11px;margin-left:8px}.library{padding:0 18px;margin-top:36px}.block-heading{display:block;padding:16px}.block-heading span{display:block;margin-top:4px}.lesson{padding:18px 16px;gap:12px;flex-wrap:wrap}.lesson-info{flex-basis:calc(100% - 45px)}.download{margin-left:30px}.instructions{padding:16px}.login-card{padding:30px 24px}.summary{font-size:14px}}