:root{--white:#ffffff;--off:#f7f6f3;--line:#e5e2dc;--ink:#1a1714;--muted:#5f5a54;--faint:#b0aba3;
--on-navy:#ffffff;--navy:#1E3A8A;--navy-l:#E4E9F7;--navy-d:#172554;--sky:#0284C7;--sky-l:#DDF1FB;--amber:#D97706;--amber-l:#fff0e8;--red:#b42318;--red-l:#fdecea;--r:8px;
--font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
@media (prefers-color-scheme:dark){:root{--white:#10131c;--off:#171b27;--line:#2a3042;--ink:#eceef5;--muted:#a3a9bd;--faint:#6b7288;
--on-navy:#0b1020;--navy:#7d9bf0;--navy-l:#1d2744;--navy-d:#a9bcf6;--sky:#5cb8e6;--sky-l:#15303f;--amber:#f0a24a;--amber-l:#3a2a17;--red:#ff8a80;--red-l:#3b1d1b}}
*{box-sizing:border-box}
[hidden]{display:none !important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--white);color:var(--ink);font:16px/1.6 var(--font);min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden}
a{color:var(--navy)}
.top{display:flex;align-items:center;justify-content:space-between;gap:.75rem;padding:.6rem max(16px,env(safe-area-inset-left));border-bottom:1px solid var(--line);background:var(--white);position:sticky;top:0;z-index:5}
.brand{white-space:nowrap;display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--ink);font-weight:700;font-size:1rem}
.mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--navy);color:var(--on-navy);font-weight:700}
#nav{display:flex;gap:.25rem;flex-wrap:wrap}
#nav a,#nav button{font:600 .92rem var(--font);color:var(--ink);background:none;border:0;padding:.55rem .7rem;min-height:44px;border-radius:var(--r);cursor:pointer;text-decoration:none;display:inline-flex;align-items:center}
#nav a:hover,#nav button:hover,#nav a[aria-current]{background:var(--navy-l);color:var(--navy-d)}
main{flex:1;width:100%;max-width:860px;margin:0 auto;padding:1.25rem 16px 3rem;outline:none}
.pad{padding:1rem 0}
h1{font-size:1.6rem;line-height:1.25;margin:.2rem 0 .8rem}
h2{font-size:1.2rem;margin:1.6rem 0 .6rem}
h3{font-size:1.02rem;margin:0 0 .3rem}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.card{border:1px solid var(--line);border-radius:var(--r);background:var(--off);padding:1rem 1.1rem;margin:.7rem 0}
.card.pinned{border-left:4px solid var(--navy)}
.grid{display:grid;gap:.8rem;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
a.course{display:block;text-decoration:none;color:inherit;border:1px solid var(--line);border-radius:var(--r);padding:1rem 1.1rem;background:var(--off);min-height:44px}
a.course:hover{border-color:var(--navy)}
a.course .code{font:600 .8rem ui-monospace,Menlo,Consolas,monospace;letter-spacing:.08em;color:var(--navy);text-transform:uppercase}
form.stack{display:grid;gap:.8rem;max-width:480px}
form.wide{max-width:none}
label{display:grid;gap:.25rem;font-weight:600;font-size:.92rem}
input,select,textarea{font:16px var(--font);padding:.65rem .75rem;border:1px solid var(--faint);border-radius:var(--r);background:var(--white);color:var(--ink);min-height:44px;width:100%}
textarea{min-height:110px;resize:vertical}
input:focus-visible,select:focus-visible,textarea:focus-visible,button:focus-visible,a:focus-visible{outline:3px solid var(--sky);outline-offset:2px}
label .pw{position:relative;display:block}.pw input{padding-right:3rem}.eye{position:absolute;right:2px;top:0;height:100%;min-width:44px;display:grid;place-items:center;background:none;border:0;color:var(--muted);cursor:pointer;border-radius:var(--r)}.eye:hover{color:var(--navy-d)}
input[type=checkbox],input[type=radio]{width:auto;min-height:0;flex:none;margin:0;accent-color:var(--navy);transform:scale(1.25)}
.check{display:flex;gap:.5rem;align-items:center;font-weight:500}
.btn{font:600 .95rem var(--font);padding:.7rem 1.2rem;min-height:44px;border-radius:var(--r);border:1px solid var(--navy);background:var(--navy);color:var(--on-navy);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:.4rem;text-decoration:none}
.btn:hover{background:var(--navy-d)}
.btn.ghost{background:transparent;color:var(--navy)}
.btn.ghost:hover{background:var(--navy-l)}
.btn.danger{border-color:var(--red);background:transparent;color:var(--red)}
.btn.small{padding:.4rem .75rem;font-size:.85rem}
.btn[disabled]{opacity:.55;cursor:wait}
.row{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}
.tabs{display:flex;flex-wrap:wrap;gap:0 .15rem;border-bottom:1px solid var(--line);margin:.5rem 0 1rem}
.tabs button{font:600 .95rem var(--font);background:none;border:0;border-bottom:3px solid transparent;padding:.7rem .9rem;min-height:44px;color:var(--muted);cursor:pointer;white-space:nowrap}
.tabs button[aria-selected=true]{color:var(--navy-d);border-bottom-color:var(--navy)}
.msg{padding:.7rem .9rem;border-radius:var(--r);margin:.6rem 0;font-size:.95rem}
.msg.err{background:var(--red-l);color:var(--red)}
.msg.ok{background:var(--sky-l);color:var(--navy-d)}
.msg.note{background:var(--amber-l);color:var(--ink)}
.file{display:flex;justify-content:space-between;align-items:center;gap:.6rem;padding:.7rem 0;border-bottom:1px solid var(--line)}
.file:last-child{border-bottom:0}
.week{font:700 .8rem ui-monospace,Menlo,Consolas,monospace;letter-spacing:.1em;text-transform:uppercase;color:var(--navy);margin:1.2rem 0 .2rem}
.tag{display:inline-block;font:600 .75rem var(--font);padding:.1rem .5rem;border-radius:99px;background:var(--navy-l);color:var(--navy-d)}
.tag.warn{background:var(--amber-l);color:var(--ink)}
.codebox{font:700 1.15rem ui-monospace,Menlo,Consolas,monospace;letter-spacing:.15em;background:var(--white);border:1px dashed var(--navy);border-radius:var(--r);padding:.3rem .7rem;display:inline-block}
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{text-align:left;padding:.5rem .4rem;border-bottom:1px solid var(--line);vertical-align:middle}
.tablewrap{overflow-x:auto}
.body-text{white-space:pre-wrap;overflow-wrap:anywhere}
.foot{border-top:1px solid var(--line);padding:1rem 16px;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.86rem;color:var(--muted)}
details{margin:.6rem 0}
summary{cursor:pointer;font-weight:600;min-height:44px;display:flex;align-items:center}
@media (max-width:520px){#nav{gap:0}#nav a,#nav button{font-size:.85rem;padding:.5rem .4rem}.tabs button{padding:.6rem .6rem;font-size:.9rem}.brand span:not(.mark){position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}h1{font-size:1.35rem}#nav a,#nav button{padding:.5rem .55rem}}

.tabs.sub{margin:.2rem 0 1rem;border-bottom:0}.tabs.sub button{border:1px solid var(--line);border-radius:99px;margin:0 .35rem .35rem 0;padding:.35rem .9rem;min-height:40px;font-size:.9rem}
.tabs.sub button[aria-selected=true]{background:var(--navy-l);border-color:var(--navy);color:var(--navy-d)}
.chip{font:600 .85rem var(--font);border:1px solid var(--line);border-radius:99px;background:var(--white);color:var(--ink);padding:.35rem .9rem;min-height:40px;cursor:pointer}
.chip[aria-pressed=true]{background:var(--navy);border-color:var(--navy);color:var(--on-navy)}
.cat{font:600 .8rem var(--font);letter-spacing:.04em;text-transform:uppercase;color:var(--muted);margin:.8rem 0 .1rem}
details>summary{list-style:none}details>summary::-webkit-details-marker{display:none}details>summary::before{content:'▸';display:inline-block;width:1.1rem;color:var(--navy)}details[open]>summary::before{content:'▾'}
input[type=search]{-webkit-appearance:none;appearance:none}

.bubbles{display:grid;gap:.5rem;margin:.8rem 0}.bubble{max-width:92%;padding:.6rem .8rem;border-radius:12px;border:1px solid var(--line);background:var(--off)}
.bubble.me{justify-self:end;background:var(--navy-l);border-color:var(--navy)}.bubble.them{justify-self:start}