/* Layout: sticky top bar · three views (Library / Student portal / Tutor desk) · graph-paper motif from the maths classroom */
:root{
  --bg:#f5f6f9; --surface:#ffffff; --ink:#16203a; --muted:#5d6681; --line:#dde1ea;
  --accent:#d8891f; --accent-ink:#ffffff; --accent-soft:#fbefdc; --navy:#1d2c54;
  --good:#1f8a5b; --good-soft:#e2f4ea; --grid:rgba(29,44,84,.06);
  --f-display:"Bricolage Grotesque",ui-sans-serif,system-ui,sans-serif;
  --f-body:"Atkinson Hyperlegible",ui-sans-serif,system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0f1424; --surface:#171e33; --ink:#e8ebf3; --muted:#9aa3bd; --line:#2a3350;
  --accent:#f0a23b; --accent-ink:#1a1206; --accent-soft:#3a2b14; --navy:#c9d3f2;
  --good:#4cc68d; --good-soft:#163428; --grid:rgba(201,211,242,.05); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0f1424; --surface:#171e33; --ink:#e8ebf3; --muted:#9aa3bd; --line:#2a3350;
  --accent:#f0a23b; --accent-ink:#1a1206; --accent-soft:#3a2b14; --navy:#c9d3f2;
  --good:#4cc68d; --good-soft:#163428; --grid:rgba(201,211,242,.05); color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font:16px/1.55 var(--f-body);margin:0}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.wrap{max-width:1080px;margin:0 auto;padding-inline:16px}

/* top bar */
.bar{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:var(--surface);border-bottom:1px solid var(--line)}
.bar .wrap{display:flex;align-items:center;gap:16px;padding-block:12px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);margin-right:auto}
.mark{width:36px;height:36px;border-radius:8px;background:var(--navy);display:grid;place-items:center}
.mark svg{display:block}
.logo b{font:800 19px/1 var(--f-display);letter-spacing:-.01em}
.logo small{display:block;font-size:11px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin-top:3px}
nav{display:flex;gap:4px;flex-wrap:wrap}
nav a{padding:8px 12px;border-radius:8px;text-decoration:none;color:var(--muted);font-weight:700;font-size:15px}
nav a[aria-current="page"]{color:var(--ink);background:var(--accent-soft)}
nav a:hover{color:var(--ink)}

/* hero */
.hero{background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:22px 22px;border-bottom:1px solid var(--line)}
.hero .wrap{padding-block:36px 28px}
.crumbs{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:14px;color:var(--muted);margin-bottom:10px}
.crumbs b{color:var(--ink)}
h1{font:800 clamp(30px,5vw,46px)/1.05 var(--f-display);letter-spacing:-.02em;margin:0 0 10px;text-wrap:balance}
h1 em{font-style:normal;color:var(--accent)}
.lede{color:var(--muted);max-width:60ch;margin:0}
h2{font:700 22px/1.2 var(--f-display);margin:0 0 4px}
h3{font:700 17px/1.3 var(--f-display);margin:0}
.eyebrow{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:700}

/* filters */
.filters{display:grid;gap:14px;padding-block:22px}
.frow{display:flex;gap:10px;align-items:baseline;flex-wrap:wrap}
.frow .eyebrow{width:110px;flex:none}
.chips{display:flex;gap:6px;flex-wrap:wrap;flex:1;min-width:0}
.chip{border:1px solid var(--line);background:var(--surface);padding:6px 12px;border-radius:999px;cursor:pointer;font-size:14px}
.chip[aria-pressed="true"]{background:var(--navy);border-color:var(--navy);color:var(--bg);font-weight:700}
.tools{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.search{flex:1;min-width:200px;padding:10px 14px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.toggle{display:flex;gap:6px;align-items:center;font-size:14px;color:var(--muted);cursor:pointer;padding:8px 10px;border-radius:8px;border:1px solid var(--line);background:var(--surface)}
.toggle input{accent-color:var(--accent)}

/* resource list */
.list{background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.row{display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;padding:14px 16px;border-top:1px solid var(--line)}
.row:first-child{border-top:0}
.row.done .rtitle{color:var(--muted)}
.rtitle{font-weight:700;min-width:0}
.meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:4px;font-size:13px;color:var(--muted)}
.tag{font:500 12px/1 var(--f-mono);padding:4px 7px;border-radius:5px;background:var(--bg);border:1px solid var(--line);color:var(--muted)}
.tag.sol{background:var(--good-soft);color:var(--good);border-color:transparent}
.tag.new{background:var(--accent-soft);color:var(--accent);border-color:transparent}
.icon-btn{width:34px;height:34px;border-radius:8px;border:1px solid var(--line);background:var(--surface);display:grid;place-items:center;cursor:pointer;color:var(--muted)}
.icon-btn[aria-pressed="true"]{color:var(--accent);border-color:var(--accent)}
.icon-btn.tick[aria-pressed="true"]{color:var(--good);border-color:var(--good);background:var(--good-soft)}
.ractions{display:flex;gap:6px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.btn{border:1px solid var(--line);background:var(--surface);padding:8px 14px;border-radius:8px;cursor:pointer;font-weight:700;font-size:14px;white-space:nowrap}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.dark{background:var(--navy);border-color:var(--navy);color:var(--bg)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.pager{display:flex;justify-content:center;gap:6px;align-items:center;padding-block:18px;font-variant-numeric:tabular-nums;color:var(--muted)}
.empty{padding:40px 16px;text-align:center;color:var(--muted)}
@media (max-width:640px){.row{grid-template-columns:auto 1fr}.ractions{grid-column:1/-1;justify-content:flex-start}.frow .eyebrow{width:100%}}

/* panels / forms */
.section{padding-block:28px 48px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:20px}
.grid2{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:20px;align-items:start}
@media (max-width:820px){.grid2{grid-template-columns:minmax(0,1fr)}}
label.f{display:grid;gap:4px;font-size:14px;font-weight:700;min-width:0}
label.f input,label.f select,label.f textarea{width:100%;min-width:0;max-width:100%;box-sizing:border-box;font-weight:400;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--bg)}
.form{display:grid;gap:12px}
.hint{font-size:13px;color:var(--muted)}
.login{max-width:420px;margin:0 auto}
.demo{background:var(--accent-soft);border-radius:8px;padding:10px 12px;font-size:14px}
.demo code,.cred code{font-family:var(--f-mono);font-size:13px}
.err{color:#c0392b;font-size:14px;min-height:1.2em}

/* timeline */
.lesson{display:grid;grid-template-columns:72px 1fr;gap:16px;padding-block:18px;border-top:1px solid var(--line)}
.lesson:first-of-type{border-top:0}
.date{font-family:var(--f-mono);font-size:13px;color:var(--muted);line-height:1.3}
.date b{display:block;font:800 26px/1 var(--f-display);color:var(--ink)}
.mats{display:grid;gap:8px;margin-top:10px}
.mat{display:flex;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);flex-wrap:wrap}
.mat .rtitle{flex:1;min-width:160px;font-size:15px}
.note{margin:6px 0 0;color:var(--muted);max-width:62ch}
.progress{height:8px;border-radius:99px;background:var(--line);overflow:hidden;margin-block:8px 4px}
.progress i{display:block;height:100%;background:var(--good)}
.stat{font:800 32px/1 var(--f-display);font-variant-numeric:tabular-nums}

/* tutor table */
.tbl-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums}
th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);padding:8px 10px;border-bottom:1px solid var(--line)}
td{padding:10px;border-bottom:1px solid var(--line);vertical-align:top}
tr.sel td{background:var(--accent-soft)}
tr[data-sid]{cursor:pointer}
.cred{border:1px dashed var(--accent);border-radius:10px;padding:12px;background:var(--accent-soft);display:grid;gap:6px}
.picker{max-height:260px;overflow:auto;border:1px solid var(--line);border-radius:8px;background:var(--bg)}
.picker label{display:flex;gap:10px;padding:8px 10px;border-bottom:1px solid var(--line);font-size:14px;cursor:pointer;align-items:flex-start}
.picker input{accent-color:var(--accent);margin-top:4px}
.stack{display:grid;gap:20px}
.pill{display:inline-block;font-size:12px;font-weight:700;padding:2px 8px;border-radius:99px;background:var(--bg);border:1px solid var(--line)}

/* modal */
.scrim{position:fixed;inset:0;background:rgba(10,14,28,.55);display:grid;place-items:center;padding:16px;z-index:50}
.modal{background:var(--surface);border-radius:14px;max-width:560px;width:100%;padding:22px;border:1px solid var(--line)}
.paper{margin-block:14px;aspect-ratio:1/1.3;max-height:50vh;width:100%;border:1px solid var(--line);border-radius:8px;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:18px 18px;display:grid;place-items:center;color:var(--muted);text-align:center;padding:16px}
.modal{max-height:90vh;overflow:auto}
.scan{display:grid;gap:10px;margin-block:12px}.scan img{width:100%;border:1px solid var(--line);border-radius:8px}
.score{font:800 40px/1 var(--f-display);font-variant-numeric:tabular-nums}
.tour-hole{position:fixed;z-index:70;border-radius:10px;box-shadow:0 0 0 9999px rgba(10,14,28,.6);outline:2px solid var(--accent);pointer-events:none;transition:all .25s ease}
.tour-card{position:fixed;z-index:71;width:min(360px,calc(100vw - 32px));background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:0 12px 40px rgba(0,0,0,.25);display:grid;gap:10px}
.tour-card p{margin:0;color:var(--muted)}
.tour-foot{display:flex;gap:8px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.tour-dots{display:flex;gap:5px}.tour-dots i{width:7px;height:7px;border-radius:50%;background:var(--line)}.tour-dots i.on{background:var(--accent)}
.tour-scrim{position:fixed;inset:0;z-index:70;background:rgba(10,14,28,.6)}
.linkbtn{background:none;border:0;color:var(--muted);cursor:pointer;font-weight:700;padding:8px 4px;text-decoration:underline}
.roles{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.tt-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.tt{display:grid;grid-template-columns:56px repeat(7,minmax(96px,1fr));min-width:760px}
.tt-h{padding:8px 6px;font-size:12px;font-weight:700;text-align:center;border-bottom:1px solid var(--line);color:var(--muted);font-variant-numeric:tabular-nums}
.tt-h.today{color:var(--accent)}
.tt-col{position:relative;cursor:copy;border-left:1px solid var(--line);background-image:linear-gradient(var(--line) 1px,transparent 1px);background-size:100% var(--hr)}
.tt-time{position:relative}.tt-time span{position:absolute;right:6px;font:500 11px/1 var(--f-mono);color:var(--muted);transform:translateY(-50%)}
.blk{position:absolute;left:3px;right:3px;border-radius:7px;padding:4px 6px;font-size:12px;line-height:1.25;overflow:hidden;cursor:pointer;border:0;text-align:left;color:var(--ink);background:var(--accent-soft);border-left:3px solid var(--accent)}
.blk b{display:block;font-size:12.5px}.blk.c1{background:var(--good-soft);border-left-color:var(--good)}.blk.c2{background:rgba(120,110,230,.14);border-left-color:#7a6ff0}.blk.c3{background:rgba(220,90,120,.13);border-left-color:#d6587a}
.blk.cx{opacity:.55;text-decoration:line-through}.blk.clash{outline:2px solid #c0392b}
.blk.extra{border-left-style:dashed}
.agenda{display:grid;gap:8px}.ag{display:grid;grid-template-columns:86px 1fr auto;gap:12px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg)}
.ag.cx{opacity:.6}.ag .when{font:500 13px/1.3 var(--f-mono);color:var(--muted)}.ag .when b{display:block;color:var(--ink);font:800 15px/1.2 var(--f-display)}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--navy);color:var(--bg);padding:10px 16px;border-radius:10px;font-weight:700;z-index:60}
footer{border-top:1px solid var(--line);background:var(--surface)}
footer .wrap{padding-block:24px;display:flex;gap:24px;flex-wrap:wrap;justify-content:space-between;font-size:14px;color:var(--muted)}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* live-site additions */
html{height:auto}
.loading{padding:48px 16px;text-align:center;color:var(--muted)}
.qtable{width:100%;font-size:14px}
.qtable td{padding:6px 8px}
.v-correct{color:var(--good);font-weight:700}.v-partial{color:var(--accent);font-weight:700}.v-wrong{color:#c0392b;font-weight:700}
.row-actions{display:flex;gap:6px;flex-wrap:wrap}
.mini{padding:5px 10px;font-size:13px}
.danger{color:#c0392b;border-color:#e6b8b2}
.setup{max-width:640px;margin:48px auto;padding-inline:16px}
.setup code{font-family:var(--f-mono);font-size:13px;background:var(--accent-soft);padding:2px 5px;border-radius:4px}

/* keep form fields inside their columns */
.form > div[style*="grid"], .modal div[style*="grid"]{min-width:0}
input[type="file"]{overflow:hidden;text-overflow:ellipsis}
input[type="date"],input[type="time"]{min-height:42px}
@media (max-width:560px){ .form div[style*="grid-template-columns"]{grid-template-columns:minmax(0,1fr)!important} }
.stack>*,.grid2>*{min-width:0}