:root { --ink:#1c1c1c; --muted:#5b5b5b; --line:#e3e0da; --bg:#fbfaf7; --accent:#0b5d7a; --warn:#fff4d6; --warn-line:#e0b84c; --ok:#e6f4ea; --bad:#fdecea; }
* { box-sizing: border-box; }
body { margin:0; font:17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color:var(--ink); background:var(--bg); }
main { max-width: 44rem; margin: 0 auto; padding: 1rem; }
.top { display:flex; flex-wrap:wrap; gap:.5rem 1rem; align-items:center; justify-content:space-between; padding:.75rem 1rem; border-bottom:1px solid var(--line); background:#fff; }
.top nav { display:flex; flex-wrap:wrap; gap:.25rem 1rem; align-items:center; }
.brand { font-weight:700; color:var(--accent); text-decoration:none; }
a { color: var(--accent); }
h1 { font-size:1.6rem; line-height:1.25; } h2 { font-size:1.25rem; margin-top:2rem; }
.inline { display:inline; margin:0; } button.link { background:none; border:0; color:var(--accent); padding:0; font:inherit; cursor:pointer; text-decoration:underline; }
button, .button { font:inherit; padding:.6rem 1rem; border-radius:.5rem; border:1px solid var(--accent); background:var(--accent); color:#fff; cursor:pointer; }
textarea, input[type=text], input[type=email], input[type=password] { width:100%; font:inherit; padding:.6rem; border:1px solid var(--line); border-radius:.5rem; }
.messages { list-style:none; padding:0; } .messages li { padding:.6rem .8rem; border-radius:.5rem; background:var(--ok); margin-bottom:.5rem; } .messages li.error { background:var(--bad); }
.why { background:#fff; border-left:4px solid var(--accent); padding:.6rem .8rem; }
.meta { color:var(--muted); font-size:.9rem; }
.notice { background:var(--warn); border:1px solid var(--warn-line); padding:.6rem .8rem; border-radius:.5rem; }
aside.remember { background:var(--warn); border:1px solid var(--warn-line); border-radius:.6rem; padding:.2rem 1rem; margin:1.25rem 0; }
.remember-title { font-weight:700; }
aside.case { background:#fff; border:1px dashed var(--line); border-radius:.6rem; padding:.2rem 1rem; }
.term { border-bottom:2px dotted var(--accent); cursor:help; position:relative; outline:none; }
.term-pop { display:none; position:absolute; left:0; top:1.6em; z-index:5; width:min(22rem, 85vw); background:#fff; color:var(--ink); border:1px solid var(--line); border-radius:.5rem; padding:.6rem .8rem; box-shadow:0 6px 20px rgba(0,0,0,.12); font-size:.92rem; line-height:1.45; }
.term:hover .term-pop, .term:focus .term-pop, .term:focus-within .term-pop { display:block; }
.term-line { display:block; margin-bottom:.4rem; }
.broken-link { color:#a33; }
.status { font-size:.75rem; padding:.05rem .4rem; border-radius:.3rem; background:#eee; margin-left:.3rem; }
.status-unverified, .status-conflict { background:var(--warn); border:1px solid var(--warn-line); }
.status-single-source { background:#eef3f7; }
.video-load { width:100%; text-align:left; background:#fff; color:var(--accent); } .video-frame { width:100%; aspect-ratio:16/9; border:0; }
.prompt pre { white-space:pre-wrap; background:#fff; border:1px solid var(--line); padding:.8rem; border-radius:.5rem; font-size:.9rem; }
.quiz fieldset { border:1px solid var(--line); border-radius:.6rem; margin:0 0 1rem; background:#fff; }
.quiz label { display:block; padding:.35rem 0; }
.result.ok { background:var(--ok); } .result.bad { background:var(--bad); } .result { padding:.6rem .8rem; border-radius:.5rem; margin-bottom:.8rem; }
.modules { padding-left:1.2rem; } .modules li { margin-bottom:.9rem; } .modules li.done::marker { content:"✓ "; }
.pager { display:flex; justify-content:space-between; gap:1rem; margin:2rem 0; }
.crumbs { font-size:.9rem; }
table { border-collapse:collapse; width:100%; display:block; overflow-x:auto; } th, td { border:1px solid var(--line); padding:.4rem .5rem; text-align:left; }
@media (min-width: 760px) { body { font-size:18px; } main { padding:1.5rem 1rem; } }