/* Teachers' Hub: matches the public website's colours and fonts (BRD 10.1) */
:root{
  --ground:#F3F5F9; --surface:#FFFFFF; --ink:#141C2B; --muted:#525D70; --line:#D8DEE8;
  --brand:#0B2E66; --brand-ink:#FFFFFF; --gold:#A9851C; --gold-bright:#CAA52D; --tint:#E6ECF5;
  --accent:#003B91; --danger:#B42318; --danger-tint:#FDECEA; --ok:#1E7B4A; --ok-tint:#E5F4E4;
  --display:"Marcellus",Georgia,serif;
  --body:"Source Sans 3","Segoe UI",system-ui,sans-serif;
  --nav-h:64px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --ground:#0D1320; --surface:#151D2D; --ink:#E8ECF3; --muted:#A2ACBD; --line:#2A3548;
    --brand:#0A2350; --brand-ink:#F2F5FA; --gold:#D9B64A; --gold-bright:#D9B64A; --tint:#1B2740;
    --accent:#D9B64A; --danger:#F97066; --danger-tint:#3A1D1D; --ok:#6CCB8F; --ok-tint:#173225;
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --ground:#0D1320; --surface:#151D2D; --ink:#E8ECF3; --muted:#A2ACBD; --line:#2A3548;
  --brand:#0A2350; --brand-ink:#F2F5FA; --gold:#D9B64A; --gold-bright:#D9B64A; --tint:#1B2740;
  --accent:#D9B64A; --danger:#F97066; --danger-tint:#3A1D1D; --ok:#6CCB8F; --ok-tint:#173225;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--ground);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.5;-webkit-text-size-adjust:100%}
h1,h2{font-family:var(--display);font-weight:400;line-height:1.2;margin:0 0 12px}
h1{font-size:clamp(1.6rem,4vw,2.1rem)}
h2{font-size:1.25rem}
p{margin:0 0 12px}
a{color:var(--accent)}
.muted{color:var(--muted)}
.small{font-size:.85rem}
.mono{font-family:ui-monospace,Menlo,Consolas,monospace;word-break:break-all}
.error{color:var(--danger)}
.eyebrow{font-size:.75rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--gold);margin:0 0 6px}
:focus-visible{outline:3px solid var(--gold-bright);outline-offset:2px}

/* boot */
.boot{display:flex;gap:12px;align-items:center;justify-content:center;min-height:60vh;color:var(--muted)}
.spinner{width:20px;height:20px;border:3px solid var(--line);border-top-color:var(--brand);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spinner{animation:none}}

/* controls */
.btn{font:inherit;font-weight:700;border-radius:6px;padding:12px 18px;min-height:44px;cursor:pointer;border:2px solid transparent}
.btn:disabled{opacity:.6;cursor:progress}
.btn-primary{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}
.btn-primary:hover{filter:brightness(1.12)}
.btn-secondary{background:var(--surface);color:var(--ink);border-color:var(--line)}
.btn-ghost{background:transparent;color:var(--brand-ink);border-color:rgba(255,255,255,.35);padding:6px 12px;min-height:36px;font-size:.9rem}
.btn-link{background:none;border:none;color:var(--accent);padding:8px 0;min-height:44px;font-weight:600;text-decoration:underline;text-underline-offset:3px}
.field{display:grid;gap:6px;font-weight:600;font-size:.95rem}
.field-hint{font-weight:400;color:var(--muted);font-size:.85rem}
input,select,textarea{font:inherit;font-weight:400;padding:11px 12px;min-height:44px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--ink);width:100%}
input[type=search]{margin:0 0 12px}

/* sign in */
.auth{min-height:100vh;display:grid;place-items:center;padding:24px 16px;
  background:var(--brand) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Cg fill='none' stroke='white' stroke-opacity='.07' stroke-width='1.2'%3E%3Crect x='22' y='22' width='36' height='36'/%3E%3Crect x='22' y='22' width='36' height='36' transform='rotate(45 40 40)'/%3E%3Ccircle cx='40' cy='40' r='8'/%3E%3C/g%3E%3C/svg%3E")}
.card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:20px;margin:0 0 16px}
.auth-card{width:min(420px,100%);display:grid;gap:14px;padding:28px;border-top:4px solid var(--gold-bright)}
.auth-brand h1{margin:0}
.auth-links{display:flex;justify-content:space-between;flex-wrap:wrap;gap:0 16px}
.form-note{background:var(--tint);border-radius:6px;padding:10px 12px;margin:0;font-size:.95rem}
.steps{margin:0;padding-left:20px;display:grid;gap:4px}
.qr{justify-self:center;background:#fff;border-radius:8px;padding:8px}

/* shell */
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  background:var(--brand);color:var(--brand-ink);padding:10px 16px;border-bottom:3px solid var(--gold-bright)}
.brand{display:grid;line-height:1.15;margin-right:auto}
.brand-name{font-family:var(--display);font-size:1.2rem}
.brand-sub{font-size:.75rem;opacity:.8;letter-spacing:.04em}
.class-picker{width:auto;min-width:150px;background:var(--surface);font-weight:600}
.class-badge{font-weight:700;background:rgba(255,255,255,.12);padding:6px 12px;border-radius:999px}
.user{display:flex;align-items:center;gap:10px}
.user-name{font-weight:600}
.role-tag{font-size:.7rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;background:var(--gold-bright);color:#1A1405;padding:2px 8px;border-radius:999px}

.nav{position:fixed;top:64px;left:0;bottom:0;width:210px;padding:16px 10px;border-right:1px solid var(--line);background:var(--surface);display:flex;flex-direction:column;gap:4px}
.nav-item{display:flex;align-items:center;gap:10px;padding:12px;border-radius:8px;text-decoration:none;color:var(--ink);font-weight:600;min-height:44px}
.nav-item:hover{background:var(--tint)}
.nav-item[aria-current=page]{background:var(--tint);color:var(--accent);box-shadow:inset 3px 0 0 var(--gold-bright)}
.nav-icon{width:20px;text-align:center}
.content{margin-left:210px;padding:24px;max-width:1100px}

/* content pieces */
.page-head{display:flex;align-items:baseline;gap:12px;justify-content:space-between}
.count{color:var(--muted);font-weight:600}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:0 0 16px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:16px;display:grid}
.stat-value{font-family:var(--display);font-size:2rem;color:var(--accent);font-variant-numeric:tabular-nums}
.stat-label{color:var(--muted);font-weight:600}
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
th{font-size:.85rem;color:var(--muted);font-weight:700}
td.num,th.num{text-align:right}
@media (max-width:760px){th,td{padding:10px 8px}}
tr.over td{background:var(--danger-tint)}
tr.inactive td{color:var(--muted)}
.list{list-style:none;margin:0;padding:0;background:var(--surface);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.list li+li{border-top:1px solid var(--line)}
.list-row{display:grid;gap:2px;padding:12px 16px;text-decoration:none;color:var(--ink);min-height:56px}
.list-row:hover{background:var(--tint)}
.list-main{font-weight:600}
.list-meta{color:var(--muted);font-size:.9rem}
.empty{padding:28px 16px;text-align:center;color:var(--muted)}
.empty-title{font-weight:700;color:var(--ink)}
.coming{display:flex;gap:12px;align-items:flex-start;background:var(--tint);border-radius:10px;padding:16px;margin:16px 0}
.coming p{margin:0}
.tag{flex:none;font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;background:var(--brand);color:var(--brand-ink);padding:4px 10px;border-radius:999px}
.back{display:inline-block;margin:0 0 12px;font-weight:600;text-decoration:none;min-height:44px;padding-top:10px}
.tabs{display:flex;gap:4px;overflow-x:auto;border-bottom:1px solid var(--line);margin:8px 0 0}
.tab{padding:10px 14px;font-weight:600;color:var(--muted);white-space:nowrap}
.tab[aria-selected=true]{color:var(--accent);border-bottom:3px solid var(--gold-bright)}

/* toasts */
#toasts{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(var(--nav-h) + 16px);display:grid;gap:8px;z-index:50;width:min(420px,calc(100% - 32px))}
.toast{background:var(--ink);color:var(--ground);padding:12px 16px;border-radius:8px;font-weight:600}
.toast-success{background:var(--ok);color:#fff}
.toast-error{background:var(--danger);color:#fff}

/* phones: bottom menu for one handed use (BRD 6) */
@media (max-width:760px){
  body{font-size:16px}
  .topbar{padding:8px 16px;gap:8px}
  .brand-sub,.user-name{display:none}
  .class-picker{min-width:0;flex:1 1 120px}
  .nav{top:auto;bottom:0;right:0;width:auto;height:calc(var(--nav-h) + env(safe-area-inset-bottom,0px));padding:4px 4px env(safe-area-inset-bottom,0px);flex-direction:row;border-right:none;border-top:1px solid var(--line);z-index:30}
  .nav-item{flex:1;flex-direction:column;gap:2px;padding:6px 2px;font-size:.72rem;justify-content:center;text-align:center;min-height:56px}
  .nav-item[aria-current=page]{box-shadow:inset 0 3px 0 var(--gold-bright)}
  .nav-icon{font-size:1.15rem}
  .content{margin-left:0;padding:16px 16px calc(var(--nav-h) + 24px)}
  .stats{grid-template-columns:repeat(3,1fr);gap:8px}
  .stat{padding:12px}
  .stat-value{font-size:1.6rem}
}
@media (min-width:761px){ #toasts{bottom:24px} }