/* ============================================================
   Captain Reef Classroom — teacher portal
   Bubble Bay identity, professional register. Deep lagoon navy,
   ocean blue, turquoise, pearl ivory, restrained gold and coral.
   No cartoon furniture; the mascot appears once, small, at sign-in.
   ============================================================ */

:root{
  --navy:#0a2b47; --navy-2:#0e3a5e; --ocean:#1668a4; --turq:#2fa5bd;
  --ivory:#f7f4ea; --paper:#ffffff; --mist:#eef4f8; --line:#d9e5ee;
  --gold:#c3953b; --gold-soft:#f0e0bd;
  --coral:#c9573a; --green:#2c7a52; --amber:#b7841f;
  --ink:#12293d; --ink-2:#4a6a83; --ink-3:#7a94a8;
  --r-lg:18px; --r-md:12px; --r-sm:8px;
  --shadow:0 1px 2px rgba(10,43,71,.06), 0 8px 24px rgba(10,43,71,.08);
  --font-ui:"Nunito",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-head:"Fredoka","Nunito",system-ui,sans-serif;
}

*{ box-sizing:border-box; }
html,body{ margin:0; padding:0; }
body{
  font-family:var(--font-ui); color:var(--ink); background:var(--mist);
  font-size:16px; line-height:1.5; -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{ font-family:var(--font-head); font-weight:600; color:var(--navy); margin:0 0 .4em; line-height:1.25; }
h1{ font-size:clamp(22px,2.4vw,30px); }
h2{ font-size:clamp(19px,2vw,24px); }
h3{ font-size:17px; }
p{ margin:0 0 .8em; }
a{ color:var(--ocean); }

:focus-visible{ outline:3px solid var(--gold); outline-offset:2px; border-radius:4px; }
.sr-only{ position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; border:0; }

/* ---------- app frame ---------- */
.tapp{ display:flex; min-height:100vh; }
.tnav{
  width:232px; flex:0 0 232px; background:var(--navy); color:#dceaf3;
  display:flex; flex-direction:column; padding:20px 14px; gap:4px;
}
/* logo.webp is 1672x941 (16:9). Never crop it into a square -- give it a
   width and let the height follow, or the wordmark becomes unreadable. */
.tbrand{ display:flex; flex-direction:column; align-items:flex-start; gap:4px; padding:2px 6px 18px; }
.tbrand img{ width:100%; max-width:176px; height:auto; display:block; }
.tbrand-sub{ font-family:var(--font-head); font-weight:600; font-size:12px; color:#8fb4cd;
  letter-spacing:.16em; text-transform:uppercase; padding-left:2px; }

.tnav-btn{
  display:flex; align-items:center; gap:10px; width:100%; text-align:left;
  background:transparent; border:0; color:#c2dcec; font:inherit; font-size:15px;
  padding:10px 12px; border-radius:var(--r-md); cursor:pointer;
}
.tnav-btn:hover{ background:rgba(255,255,255,.07); color:#fff; }
.tnav-btn[aria-current="page"]{ background:var(--ocean); color:#fff; font-weight:700; }
.tnav-spacer{ flex:1; }
.tnav-foot{ border-top:1px solid rgba(255,255,255,.12); padding-top:12px; margin-top:8px; font-size:12.5px; color:#8fb4cd; }
.tnav-user{ color:#fff; font-weight:700; font-size:13.5px; margin-bottom:2px; word-break:break-word; }

.tmain{ flex:1; min-width:0; display:flex; flex-direction:column; }
.ttop{
  display:flex; align-items:center; gap:14px; flex-wrap:wrap;
  padding:16px 26px; background:var(--paper); border-bottom:1px solid var(--line);
}
.ttop h1{ margin:0; flex:1; min-width:200px; }
.tcontent{ padding:24px 26px 60px; max-width:1240px; width:100%; }

/* ---------- sync status ---------- */
.tsync{ display:inline-flex; align-items:center; gap:7px; font-size:13px; color:var(--ink-2); }
.tsync .dot{ width:9px; height:9px; border-radius:50%; background:var(--ink-3); flex:0 0 auto; }
.tsync.ok .dot{ background:var(--green); }
.tsync.warn .dot{ background:var(--amber); }
.tsync.bad .dot{ background:var(--coral); }

/* ---------- buttons ---------- */
.btn{
  font:inherit; font-weight:700; font-size:14.5px; cursor:pointer;
  padding:.6em 1.15em; border-radius:999px; border:1.5px solid transparent;
  background:var(--ocean); color:#fff; transition:filter .12s ease;
  display:inline-flex; align-items:center; gap:7px; text-decoration:none;
}
.btn:hover{ filter:brightness(1.07); }
.btn[disabled]{ opacity:.55; cursor:default; filter:none; }
.btn.secondary{ background:var(--paper); color:var(--navy); border-color:var(--line); }
.btn.secondary:hover{ background:var(--mist); }
.btn.gold{ background:var(--gold); color:#22180a; }
.btn.danger{ background:var(--paper); color:var(--coral); border-color:#eccec6; }
.btn.small{ font-size:13px; padding:.42em .85em; }
.btn.link{ background:none; border:0; color:var(--ocean); text-decoration:underline; padding:.2em; font-weight:600; }

/* ---------- cards & panels ---------- */
.panel{
  background:var(--paper); border:1px solid var(--line); border-radius:var(--r-lg);
  padding:20px 22px; box-shadow:var(--shadow); margin-bottom:20px;
}
.panel-head{ display:flex; align-items:center; gap:12px; flex-wrap:wrap; margin-bottom:14px; }
.panel-head h2, .panel-head h3{ margin:0; flex:1; min-width:160px; }

.stat-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:14px; margin-bottom:20px; }
.stat{
  background:var(--paper); border:1px solid var(--line); border-radius:var(--r-lg);
  padding:16px 18px; box-shadow:var(--shadow);
}
.stat .v{ font-family:var(--font-head); font-size:30px; font-weight:600; color:var(--navy); line-height:1.1; }
.stat .l{ font-size:13px; color:var(--ink-2); margin-top:3px; }
.stat.accent{ background:linear-gradient(180deg,#fff,var(--gold-soft)); border-color:#e6d3a8; }

.class-cards{ display:grid; grid-template-columns:repeat(auto-fill,minmax(268px,1fr)); gap:16px; }
.class-card{
  text-align:left; background:var(--paper); border:1px solid var(--line);
  border-radius:var(--r-lg); padding:18px; cursor:pointer; font:inherit;
  box-shadow:var(--shadow); display:flex; flex-direction:column; gap:6px;
}
.class-card:hover{ border-color:var(--turq); }
.class-card .cc-name{ font-family:var(--font-head); font-size:19px; font-weight:600; color:var(--navy); }
.class-card .cc-meta{ font-size:13px; color:var(--ink-2); }
.class-card .cc-code{ font-size:12.5px; color:var(--ink-3); letter-spacing:.06em; }

/* ---------- tables ---------- */
.table-wrap{ overflow-x:auto; }
table.roster{ width:100%; border-collapse:collapse; font-size:14.5px; }
table.roster caption{ text-align:left; font-size:13px; color:var(--ink-2); padding-bottom:8px; }
table.roster th, table.roster td{ padding:10px 12px; text-align:left; border-bottom:1px solid var(--line); }
table.roster th{
  font-size:12.5px; text-transform:uppercase; letter-spacing:.05em;
  color:var(--ink-2); font-weight:700; white-space:nowrap; background:var(--mist);
}
table.roster th button{ background:none; border:0; font:inherit; color:inherit; cursor:pointer; padding:0; }
table.roster td.num, table.roster th.num{ text-align:right; }
table.roster tbody tr:hover{ background:var(--mist); }
table.roster .learner-link{ background:none; border:0; font:inherit; font-weight:700; color:var(--ocean); cursor:pointer; padding:0; text-align:left; }

/* ---------- mastery bars ---------- */
.bar-row{ display:grid; grid-template-columns:minmax(120px,1.1fr) 3fr auto; gap:12px; align-items:center; margin-bottom:11px; font-size:14px; }
.bar-label{ color:var(--ink); }
.bar-track{ height:11px; border-radius:999px; background:var(--mist); overflow:hidden; border:1px solid var(--line); }
.bar-fill{ height:100%; border-radius:999px; background:linear-gradient(90deg,var(--turq),var(--ocean)); }
.bar-fill.low{ background:linear-gradient(90deg,#e8a87c,var(--coral)); }
.bar-fill.mid{ background:linear-gradient(90deg,var(--gold),#d9a94a); }
.bar-val{ font-variant-numeric:tabular-nums; color:var(--ink-2); font-size:13px; min-width:52px; text-align:right; }

/* ---------- chips, filters, forms ---------- */
.chips{ display:flex; flex-wrap:wrap; gap:8px; }
.chip{
  font:inherit; font-size:13px; padding:.35em .8em; border-radius:999px;
  border:1.5px solid var(--line); background:var(--paper); color:var(--ink-2); cursor:pointer;
}
.chip[aria-pressed="true"]{ background:var(--navy); color:#fff; border-color:var(--navy); font-weight:700; }
.tag{ display:inline-block; font-size:12px; padding:.2em .6em; border-radius:999px; background:var(--mist); color:var(--ink-2); }
.tag.good{ background:#e4f2ea; color:var(--green); }
.tag.watch{ background:#fbf0d8; color:var(--amber); }
.tag.focus{ background:#f8e6e1; color:var(--coral); }

.field{ display:block; margin-bottom:14px; }
.field > span{ display:block; font-size:13.5px; font-weight:700; color:var(--ink-2); margin-bottom:5px; }
.field input, .field select, .field textarea{
  width:100%; font:inherit; font-size:15px; padding:.6em .75em;
  border:1.5px solid var(--line); border-radius:var(--r-md); background:var(--paper); color:var(--ink);
}
.field textarea{ min-height:150px; resize:vertical; font-family:var(--font-ui); }
.field-row{ display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr)); gap:0 16px; }
.hint{ font-size:12.5px; color:var(--ink-3); margin-top:4px; }
.checkline{ display:flex; align-items:flex-start; gap:9px; margin-bottom:12px; font-size:14.5px; }
.checkline input{ margin-top:3px; }

.msg{ padding:11px 14px; border-radius:var(--r-md); font-size:14.5px; margin-bottom:14px; }
.msg.info{ background:var(--mist); color:var(--ink-2); border:1px solid var(--line); }
.msg.bad{ background:#fbeae5; color:#8d3520; border:1px solid #edc8bd; }
.msg.good{ background:#e4f2ea; color:#1d5c3c; border:1px solid #bcdccb; }

/* ---------- empty states ---------- */
.empty{ text-align:center; padding:44px 20px; color:var(--ink-2); }
.empty h3{ color:var(--navy); }
.empty p{ max-width:34em; margin:0 auto 1em; }

/* ---------- auth screen ---------- */
.auth-wrap{ min-height:100vh; display:grid; place-items:center; padding:24px;
  background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 55%,#14567f 100%); }
.auth-card{ width:min(460px,100%); background:var(--paper); border-radius:22px; padding:30px 32px;
  box-shadow:0 24px 60px rgba(3,20,38,.34); }
.auth-brand{ text-align:center; margin-bottom:20px; }
.auth-brand img{ width:min(260px,78%); height:auto; display:block; margin:0 auto; }
.auth-brand h1{ margin:14px 0 2px; font-size:23px; }
.auth-brand p{ color:var(--ink-2); font-size:14px; margin:0; }
.auth-tabs{ display:flex; gap:6px; background:var(--mist); padding:5px; border-radius:999px; margin-bottom:20px; }
.auth-tabs button{ flex:1; font:inherit; font-weight:700; font-size:14px; padding:.55em; border:0;
  border-radius:999px; background:transparent; color:var(--ink-2); cursor:pointer; }
.auth-tabs button[aria-selected="true"]{ background:var(--paper); color:var(--navy); box-shadow:var(--shadow); }
.auth-foot{ margin-top:18px; text-align:center; font-size:13px; color:var(--ink-3); }

/* ---------- learner detail ---------- */
.detail-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:20px; }
.kv{ display:flex; justify-content:space-between; gap:14px; padding:7px 0; border-bottom:1px dashed var(--line); font-size:14.5px; }
.kv:last-child{ border-bottom:0; }
.kv .k{ color:var(--ink-2); }
.kv .v{ font-weight:700; color:var(--navy); text-align:right; }
.wordlist{ display:flex; flex-wrap:wrap; gap:7px; }
.wordlist span{ font-size:13.5px; padding:.28em .7em; border-radius:999px; background:var(--mist); border:1px solid var(--line); }

/* ---------- demo banner ---------- */
.demo-banner{
  background:var(--gold-soft); border:1px solid #e2cfa4; color:#5c4715;
  padding:9px 18px; font-size:13.5px; font-weight:700; text-align:center;
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .tapp{ flex-direction:column; }
  .tnav{ width:100%; flex:0 0 auto; flex-direction:row; flex-wrap:wrap; align-items:center;
    padding:12px; gap:6px; }
  .tbrand{ flex-direction:row; align-items:center; gap:8px; padding:0 10px 0 4px; }
  .tbrand img{ max-width:118px; }
  .tbrand-sub{ font-size:11px; }
  .tnav-btn{ width:auto; font-size:14px; padding:8px 12px; }
  .tnav-spacer{ display:none; }
  .tnav-foot{ width:100%; border-top:0; padding-top:0; margin-top:4px; display:flex;
    align-items:center; gap:12px; justify-content:flex-end; }
  .tcontent{ padding:18px 14px 50px; }
  .ttop{ padding:14px 16px; }
}
/* narrow screens get cards, never a squeezed desktop table (§68) */
@media (max-width:640px){
  table.roster, table.roster tbody, table.roster tr, table.roster td{ display:block; width:100%; }
  table.roster thead{ display:none; }
  table.roster tr{ border:1px solid var(--line); border-radius:var(--r-md); margin-bottom:12px; padding:10px 12px; }
  table.roster td{ border:0; padding:4px 0; display:flex; justify-content:space-between; gap:12px; }
  table.roster td::before{ content:attr(data-label); font-size:12.5px; color:var(--ink-2); font-weight:700; }
  table.roster td.num{ text-align:right; }
}

@media (prefers-reduced-motion: reduce){ *{ transition:none !important; animation:none !important; } }

/* ============================================================
   PRINT — true A4 layouts. No screenshots, no rasterisation:
   printed text stays selectable and sharp (§41).
   ============================================================ */
@media print{
  @page{ size:A4 portrait; margin:14mm 12mm; }
  body{ background:#fff; font-size:11pt; }
  .tnav, .ttop, .no-print, .btn, .chips, .demo-banner{ display:none !important; }
  .tapp{ display:block; }
  .tcontent{ padding:0; max-width:none; }
  .panel{ box-shadow:none; border:1px solid #c9d6e0; break-inside:avoid; margin-bottom:10mm; }
  .print-only{ display:block !important; }
  table.roster{ font-size:10pt; }
  table.roster th{ background:#eef4f8 !important; -webkit-print-color-adjust:exact; print-color-adjust:exact; }
  .bar-fill{ -webkit-print-color-adjust:exact; print-color-adjust:exact; }
  h1,h2,h3{ break-after:avoid; }
}
.print-only{ display:none; }

/* ---------- join cards: 2 x 4 on one A4 sheet ---------- */
.cards-sheet{ display:grid; grid-template-columns:1fr 1fr; gap:6mm; }
.join-card{
  border:1.5px dashed #9bb6c8; border-radius:6mm; padding:6mm 5mm; text-align:center;
  background:#fff; break-inside:avoid; display:flex; flex-direction:column; align-items:center; gap:2mm;
}
.jc-brand{ font-family:var(--font-head); font-size:11pt; font-weight:600; color:var(--navy); }
.jc-alias{ font-family:var(--font-head); font-size:17pt; font-weight:600; color:var(--ocean); margin:1mm 0; }
.jc-qr{ width:34mm; height:34mm; }
.jc-qr svg{ width:100%; height:100%; display:block; }
.jc-codes{ font-size:10pt; line-height:1.5; }
.jc-codes b{ font-family:var(--font-head); letter-spacing:.14em; font-size:12pt; color:var(--navy); }
.jc-steps{ font-size:8.5pt; color:#4a6a83; line-height:1.4; text-align:left; margin:1mm 0 0; padding-left:4mm; }
@media print{
  .cards-sheet{ gap:5mm; }
  .join-card{ page-break-inside:avoid; }
}