:root{--bg: #f5f6f8;--surface: #ffffff;--ink: #1b2330;--muted: #5f6b7a;--edge: #d8dde5;--accent: #3b5bdb;--accent-deep: #2f49b0;--accent-soft: #edf1ff;--good: #1f7a45;--good-soft: #e5f4ea;--warn: #9a5b00;--warn-soft: #fff3da;--bad: #b3261e;--bad-soft: #fdecea;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.top{background:var(--ink);padding:12px 24px}.top{display:flex;align-items:center;justify-content:space-between;gap:16px}.who{display:flex;align-items:center;gap:12px;color:#fff;font-size:14px}.sign-in{margin:40px auto}input[type=email]{font:inherit;color:inherit;width:100%;padding:8px 10px;border:1px solid var(--edge);border-radius:8px;background:#fff}.brand{color:#fff;font-weight:800;font-size:17px;text-decoration:none}main{max-width:1080px;margin:0 auto;padding:20px 24px 80px}h1{font-size:24px;margin:6px 0 14px;line-height:1.25}h2{font-size:17px;margin:22px 0 10px}.card>h2:first-child{margin-top:0}p{margin:6px 0}a{color:var(--accent-deep)}.muted{color:var(--muted)}.small{font-size:13px}.crumbs{font-size:13px;color:var(--muted);margin-bottom:4px}.crumbs .sep{margin:0 6px}.head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.head.sticky{position:sticky;top:0;z-index:5;background:var(--bg);padding:8px 0;margin-bottom:6px;border-bottom:1px solid var(--edge)}.head.sticky h1{margin:0;font-size:20px}.actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.card{background:var(--surface);border:1px solid var(--edge);border-radius:12px;padding:16px 18px;margin-bottom:14px}.card.narrow{max-width:420px;display:grid;gap:10px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-bottom:14px}.tile{display:flex;flex-direction:column;gap:4px;text-decoration:none;color:inherit;margin:0}.tile:hover,.row:hover{border-color:var(--accent)}.tile 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var(--accent-deep);background:var(--accent);color:#fff;text-decoration:none;white-space:nowrap}.btn:hover:not(:disabled){background:var(--accent-deep)}.btn.ghost{background:#fff;color:var(--accent-deep);border-color:var(--edge)}.btn.ghost:hover:not(:disabled){background:var(--accent-soft)}.btn.small{padding:5px 10px;font-size:13px}.btn.danger{background:#fff;color:var(--bad);border-color:var(--bad)}.btn.danger:hover:not(:disabled){background:var(--bad-soft)}.btn:disabled,.icon-btn:disabled{opacity:.45;cursor:default}.icon-btn{font:inherit;cursor:pointer;width:28px;height:28px;border-radius:6px;border:1px solid var(--edge);background:#fff;color:var(--muted);line-height:1}.icon-btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent-deep)}.icon-btn.danger:hover:not(:disabled){border-color:var(--bad);color:var(--bad)}.row-tools{display:inline-flex;gap:4px;flex-shrink:0}.add-row{display:flex;gap:12px;align-items:flex-end;flex-wrap:wrap}.add-row .field{flex:1;min-width:180px}.add-row.inline{margin-top:10px;align-items:center}.add-row.inline input[type=text]{flex:1;min-width:160px;width:auto}.lines{display:grid;gap:6px;justify-items:start}.line{display:flex;gap:8px;align-items:center;width:100%}.unit-head,.item-head{display:flex;gap:10px;align-items:center;margin-bottom:8px}.unit-head input,.item-head input{flex:1;font-weight:700}.grow{flex:1}.lessons{list-style:none;margin:0;padding:0;counter-reset:lesson}.lessons li{counter-increment:lesson;display:flex;gap:10px;align-items:center;padding:7px 0;border-top:1px solid var(--edge)}.lessons li:before{content:counter(lesson);width:22px;color:var(--muted);font-size:13px;text-align:right}.lesson-link{flex:1;min-width:0;font-weight:600;text-decoration:none}.lesson-link:hover{text-decoration:underline}.two-col{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:16px;align-items:start}.checklist{position:sticky;top:64px}.checklist ul{list-style:none;margin:0 0 8px;padding:0;display:grid;gap:6px}.checklist .ok{color:var(--good)}.checklist .todo{color:var(--warn);font-weight:600}.item{border:1px solid var(--edge);border-radius:10px;padding:12px;margin:10px 0;display:grid;gap:10px;background:#fbfcfd}.item .item-head{margin:0}.variant{display:grid;gap:10px}.variant+.variant{border-top:1px dashed var(--edge);padding-top:10px}.note{font-size:13px;color:var(--warn);background:var(--warn-soft);border-radius:8px;padding:6px 10px;margin:0}.words{list-style:none;margin:0;padding:0}.words li{display:flex;gap:10px;justify-content:space-between;align-items:center;padding:6px 0;border-top:1px solid var(--edge)}.terms{list-style:none;margin:0;padding:0}.terms li{display:flex;gap:16px;justify-content:space-between;align-items:flex-start;margin-bottom:8px;padding:12px 16px}.problem{background:var(--bad-soft);border:1px solid var(--bad);color:var(--bad);border-radius:10px;padding:10px 14px;margin:10px 0}.problem ul{margin:6px 0 0;padding-left:20px}.danger-zone{margin-top:28px;padding-top:14px;border-top:1px solid var(--edge)}@media (max-width: 800px){main{padding:16px 16px 60px}.two-col{grid-template-columns:1fr}.checklist{position:static;order:-1}.form{grid-template-columns:1fr}.row{flex-wrap:wrap}}