/* Prep9ja Exam Hall — light CBT theme. Vanilla CSS, no build. */
:root {
  --bg:#f1f5f4; --card:#ffffff; --border:#e2e8f0; --border-2:#cbd5e1;
  --text:#0f172a; --muted:#64748b; --faint:#94a3b8;
  --accent:#059669; --accent-dark:#047857; --accent-soft:#ecfdf5;
  --danger:#dc2626; --danger-soft:#fef2f2;
  --warn:#d97706; --warn-soft:#fffbeb;
  --info:#2563eb; --info-soft:#eff6ff;
  --radius:14px;
  --shadow:0 1px 2px rgba(15,23,42,.06), 0 8px 24px -12px rgba(15,23,42,.18);
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --mono:ui-monospace,'SF Mono',Menlo,Consolas,monospace;
}
* { box-sizing:border-box; }
html { -webkit-text-size-adjust:100%; }
body { margin:0; background:var(--bg); color:var(--text); font-family:var(--font);
  font-size:15px; line-height:1.5; }
.hidden { display:none !important; }
.view { min-height:100vh; }
.muted { color:var(--muted); font-size:13px; }
.center { text-align:center; }
button { font-family:var(--font); }

/* ---------- buttons / inputs ---------- */
.btn-primary { padding:12px 22px; border-radius:10px; border:1px solid var(--accent-dark);
  background:var(--accent); color:#fff; font-weight:700; font-size:14px; cursor:pointer;
  white-space:nowrap; box-shadow:0 1px 2px rgba(5,150,105,.4); }
.btn-primary:hover:not(:disabled) { background:var(--accent-dark); }
.btn-primary:disabled { opacity:.55; cursor:wait; }
.btn-ghost { padding:12px 18px; border-radius:10px; border:1px solid var(--border-2);
  background:var(--card); color:var(--text); font-weight:600; font-size:14px; cursor:pointer; }
.btn-ghost:hover { border-color:var(--faint); }
.btn-block { width:100%; margin-top:14px; font-size:15px; padding:13px; }
.grow { flex:1; }
.row { display:flex; gap:10px; margin-top:16px; }
input[type=text], input[type=email], input[type=number], input[type=tel], textarea, select {
  width:100%; padding:12px 14px; border-radius:10px; border:1.5px solid var(--border-2);
  background:#fff; color:var(--text); font-size:15px; font-family:var(--font); outline:none;
  transition:border-color .15s, box-shadow .15s; }
input:focus, textarea:focus, select:focus { border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(5,150,105,.15); }
.err { color:var(--danger); font-size:13px; font-weight:600; min-height:20px; margin-top:10px; }
.ts-wrap { margin-top:14px; display:flex; flex-direction:column; align-items:center; gap:6px; }
.ts-wrap.hidden { display:none; }
.ts-note { font-size:12px; color:var(--faint); text-align:center; }
.ts-note.hidden { display:none; }
.fld { display:block; text-align:left; font-size:13px; font-weight:700; color:var(--text); margin-top:14px; }
.fld input, .fld textarea, .fld select { margin-top:6px; font-weight:400; }
.opt-tag { font-weight:600; color:var(--faint); font-size:11px; }

/* ---------- entry views (code + form + done) ---------- */
.entry { background:
  linear-gradient(rgba(241,245,244,.93), rgba(241,245,244,.90)),
  url('https://prep9ja.com.ng/assets/phead-bg.jpg') center 30%/cover no-repeat,
  radial-gradient(900px 320px at 50% -80px, rgba(5,150,105,.14), transparent 70%),
  var(--bg); }
.entry-wrap { max-width:560px; margin:0 auto; padding:36px 16px 48px; }
.brand { display:flex; align-items:center; justify-content:center; gap:10px; margin-bottom:22px; }
.brand-mark { width:38px; height:38px; border-radius:11px; object-fit:cover; }
.brand-name { font-weight:800; font-size:18px; letter-spacing:-.02em; }
.brand-name em { font-style:normal; color:var(--accent-dark); }
.card { background:var(--card); border:1px solid var(--border); border-radius:18px;
  padding:28px; box-shadow:var(--shadow); }
.card h1 { margin:0 0 6px; font-size:24px; letter-spacing:-.02em; }
.card h2 { margin:0 0 4px; font-size:21px; letter-spacing:-.02em; }
.hero { text-align:center; }
.foot { text-align:center; color:var(--faint); font-size:12px; margin-top:18px; }
a.support-link { color:var(--accent-dark); font-weight:700; text-decoration:none; border-bottom:1px solid rgba(5,150,105,.35); }
a.support-link:hover { border-bottom-color:var(--accent-dark); }

/* steps */
.steps { display:flex; list-style:none; margin:0 0 16px; padding:0; gap:4px; }
.steps li { flex:1; display:flex; align-items:center; gap:7px; font-size:12px; font-weight:700;
  color:var(--faint); }
.steps li span { width:24px; height:24px; border-radius:50%; background:#e2e8f0; color:var(--muted);
  display:grid; place-items:center; font-size:12px; flex:none; }
.steps li.done { color:var(--accent-dark); }
.steps li.done span { background:var(--accent); color:#fff; }
.steps li.now { color:var(--text); }
.steps li.now span { background:var(--text); color:#fff; }

/* segmented code boxes */
#codeboxes { display:flex; gap:8px; justify-content:center; margin:20px 0 4px; }
.cbox { width:48px; height:58px; text-align:center; font-size:24px; font-weight:800;
  font-family:var(--mono); text-transform:uppercase; padding:0; border-radius:12px; }
.cbox.filled { border-color:var(--accent); background:var(--accent-soft); }

/* hall preview card */
.hallprev { margin-top:18px; border:1px solid var(--border); border-radius:var(--radius);
  overflow:hidden; text-align:left; }
.hallprev .hp-top { background:linear-gradient(135deg,#064e3b,#059669); color:#fff; padding:16px 18px; }
.hallprev .hp-top b { font-size:17px; letter-spacing:-.01em; display:block; }
.hallprev .hp-top span { font-size:12px; opacity:.85; }
.hp-stats { display:grid; grid-template-columns:repeat(3,1fr); }
.hp-stats div { padding:12px 8px; text-align:center; border-top:1px solid var(--border); }
.hp-stats div + div { border-left:1px solid var(--border); }
.hp-stats b { display:block; font-size:17px; }
.hp-stats span { font-size:11px; color:var(--muted); font-weight:600; text-transform:uppercase; }
.hp-subjects { display:flex; flex-wrap:wrap; gap:6px; padding:12px 14px; }
.chip { background:var(--accent-soft); border:1px solid #a7f3d0; color:#065f46;
  font-size:12px; font-weight:700; border-radius:999px; padding:4px 11px; }
.hallline { background:var(--accent-soft); border:1px solid #a7f3d0; border-radius:10px;
  padding:10px 14px; font-size:13px; margin:12px 0 4px; color:#065f46; }

/* ---------- exam view ---------- */
#exam-top { position:sticky; top:0; z-index:20; display:flex; justify-content:space-between;
  align-items:center; gap:14px; background:var(--card); border-bottom:1px solid var(--border);
  padding:10px 20px; box-shadow:0 1px 8px rgba(15,23,42,.06); }
.et-left { min-width:0; flex:1; }
#exam-title { font-weight:800; font-size:15px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
#exam-sub { font-size:12px; }
.progress { height:5px; background:#e2e8f0; border-radius:99px; margin-top:7px; overflow:hidden; max-width:420px; }
#exam-progress { height:100%; width:0; background:linear-gradient(90deg,#059669,#10b981);
  border-radius:99px; transition:width .3s; }
.et-right { display:flex; align-items:center; gap:10px; flex:none; }
.save { display:flex; align-items:center; gap:6px; font-size:12px; font-weight:600; color:var(--muted); }
.save i { width:8px; height:8px; border-radius:50%; background:var(--accent); display:block; }
.save b { font-weight:600; }
.save.busy i { background:var(--warn); animation:blink 1s infinite; }
.save.off i { background:var(--danger); }
.save.off { color:var(--danger); }
@keyframes blink { 50% { opacity:.3; } }
#timer { display:flex; align-items:center; gap:7px; font-family:var(--mono); font-weight:800;
  font-size:16px; background:#0f172a; color:#fff; padding:8px 14px; border-radius:10px; }
#timer.warn { background:#92400e; }
#timer.low { background:var(--danger); animation:pulse 1.2s infinite; }
@keyframes pulse { 50% { opacity:.75; } }
#btn-submit { padding:10px 20px; }

/* exam tools (calculator / rough work / comfort) */
.et-tools { display:flex; gap:6px; }
.tool { display:flex; align-items:center; gap:6px; padding:8px 11px; border-radius:10px;
  border:1px solid var(--border-2); background:var(--bg-soft, #f8fafc); color:var(--ink);
  font-size:13px; font-weight:700; cursor:pointer; }
.tool:hover { border-color:var(--accent); color:var(--accent-dark); }
.tool.on { background:var(--accent-soft); border-color:var(--accent); color:var(--accent-dark); }
.tool-lbl { display:none; }
@media (min-width:900px) { .tool-lbl { display:inline; } }
#exam-tools { max-width:1140px; margin:0 auto; padding:0 16px; }
.tool-panel { background:var(--card); border:1px solid var(--border); border-radius:14px;
  padding:14px 16px; margin-top:12px; box-shadow:0 6px 20px rgba(15,23,42,.06); }
.tool-panel.hidden { display:none; }

/* calculator */
.calc-head { display:flex; justify-content:space-between; align-items:center; margin-bottom:10px; }
.calc-title { font-size:12px; font-weight:800; letter-spacing:.06em; text-transform:uppercase; color:var(--muted); }
.calc-tools { display:flex; gap:6px; align-items:center; }
.calc-chip { padding:4px 9px; border-radius:8px; border:1px solid var(--border-2); background:transparent;
  color:var(--muted); font-size:11px; font-weight:800; cursor:pointer; }
.calc-chip:hover { border-color:var(--accent); color:var(--accent-dark); }
.calc-x { border:none; background:transparent; color:var(--muted); font-size:15px; cursor:pointer; }
.calc-input { width:100%; box-sizing:border-box; padding:12px 14px; border-radius:10px;
  border:1px solid var(--border-2); background:var(--bg-soft, #f8fafc); color:var(--ink);
  font-size:20px; font-weight:800; text-align:right; font-family:var(--mono); outline:none; }
.calc-row { display:grid; grid-template-columns:repeat(5,1fr); gap:6px; margin-top:6px; }
.calc-key { padding:11px 0; border-radius:10px; border:1px solid var(--border);
  background:var(--card); color:var(--ink); font-size:15px; font-weight:700; cursor:pointer; }
.calc-key:hover { border-color:var(--accent); }
.calc-key.op { background:var(--accent-soft); color:var(--accent-dark); }
.calc-key.eq { background:var(--accent); border-color:var(--accent-dark); color:#fff; }
.calc-tape { margin-top:8px; border-top:1px solid var(--border); padding-top:6px; }
.tape-row { display:flex; justify-content:space-between; font-size:12px; color:var(--muted); padding:2px 0; }
.tape-row b { color:var(--ink); }
.calc-note { font-size:11px; color:var(--muted); margin:8px 0 0; }

/* scratch pad */
.scratch-tools { display:flex; gap:8px; align-items:center; flex-wrap:wrap; margin-bottom:8px; }
.scratch-tools .sw { width:20px; height:20px; border-radius:50%; border:1px solid var(--border-2); cursor:pointer; }
.grow { flex:1; }
#scratch-canvas { width:100%; height:180px; border-radius:12px; border:1px solid var(--border);
  background:var(--bg-soft, #f8fafc); touch-action:none; display:block; }
#scratch-note { width:100%; box-sizing:border-box; margin-top:8px; padding:10px 12px; border-radius:12px;
  border:1px solid var(--border-2); background:var(--bg-soft, #f8fafc); color:var(--ink);
  font-family:var(--mono); font-size:14px; line-height:1.7; resize:vertical; outline:none; }
.comfort-row { display:flex; align-items:center; gap:8px; font-size:13px; font-weight:700; padding:4px 0; }
.comfort-row.toggle { cursor:pointer; }
kbd { padding:2px 7px; border-radius:6px; border:1px solid var(--border-2);
  background:var(--bg-soft, #f8fafc); font-family:var(--mono); font-size:12px; font-weight:800; color:var(--ink); }
.shortcut-grid { display:grid; grid-template-columns:auto 1fr; gap:7px 14px; align-items:center;
  font-size:13px; color:var(--muted); }

/* secure exam: no selecting, copying, dragging or long-press menu on the
   paper; answer inputs stay editable. Screenshots cannot be blocked from a
   browser - that needs the Prep9ja app (FLAG_SECURE). */
#v-exam, #v-done { -webkit-user-select:none; user-select:none; -webkit-touch-callout:none; }
#v-exam input, #v-exam textarea { -webkit-user-select:text; user-select:text; }
#v-exam img { -webkit-user-drag:none; user-drag:none; }

/* announcements */
#announce { max-width:1140px; margin:0 auto; padding:10px 16px 0; display:flex;
  flex-direction:column; gap:8px; }
#announce:empty { display:none; }
.ann { background:var(--info-soft); border:1px solid #bfdbfe; color:#1e40af; border-radius:10px;
  padding:10px 14px; font-size:13px; display:flex; gap:10px; align-items:flex-start; }
.ann button { margin-left:auto; border:none; background:none; color:inherit; cursor:pointer;
  font-size:14px; padding:0 0 0 8px; }

/* layout */
#exam-body { display:flex; gap:16px; padding:14px 16px 40px; max-width:1140px; margin:0 auto;
  align-items:flex-start; }
#side { width:220px; flex:none; position:sticky; top:86px; background:var(--card);
  border:1px solid var(--border); border-radius:var(--radius); padding:14px; box-shadow:var(--shadow); }
.side-head { font-size:12px; font-weight:800; text-transform:uppercase; color:var(--muted);
  margin-bottom:10px; display:flex; justify-content:space-between; }
#palette { display:grid; grid-template-columns:repeat(5,1fr); gap:7px; }
#palette button { aspect-ratio:1; border-radius:9px; border:1.5px solid var(--border-2);
  background:#fff; color:var(--text); font-weight:700; font-size:12px; cursor:pointer; padding:0; }
#palette button:hover { border-color:var(--accent); }
#palette button.ans { background:var(--accent); border-color:var(--accent-dark); color:#fff; }
#palette button.cur { border-color:var(--text); box-shadow:0 0 0 2px rgba(15,23,42,.2); }
#palette button.ans.cur { box-shadow:0 0 0 2px rgba(5,150,105,.45); }
#palette button.flag::after { content:''; position:absolute; }
#palette button.flag { border-color:var(--warn); color:var(--warn); }
#palette button.ans.flag { background:var(--warn); border-color:var(--warn); color:#fff; }
#palette button { position:relative; }
.legend { display:flex; flex-wrap:wrap; gap:8px 12px; margin-top:12px; font-size:11px; color:var(--muted); }
.dot { width:10px; height:10px; border-radius:3px; display:inline-block; margin-right:4px;
  border:1.5px solid var(--border-2); vertical-align:baseline; }
.dot.ans { background:var(--accent); border-color:var(--accent); }
.dot.cur { border-color:var(--text); }
.dot.flag { background:var(--warn); border-color:var(--warn); }

/* question card */
#paper { flex:1; min-width:0; }
.q { background:var(--card); border:1px solid var(--border); border-radius:16px;
  padding:22px; box-shadow:var(--shadow); }
.q-top { display:flex; align-items:center; gap:8px; margin-bottom:6px; flex-wrap:wrap; }
.q-num { background:#0f172a; color:#fff; font-size:12px; font-weight:800; border-radius:8px;
  padding:3px 10px; }
.q-subj { font-size:12px; font-weight:700; color:var(--accent-dark); background:var(--accent-soft);
  border-radius:8px; padding:3px 10px; }
.q-topic { font-size:12px; color:var(--muted); }
.q h3 { margin:8px 0 4px; font-size:17px; line-height:1.55; font-weight:600; }
.q .marks { font-size:12px; color:var(--muted); margin-bottom:14px; }
.q label.opt { display:flex; gap:12px; align-items:flex-start; background:#f8fafc;
  border:1.5px solid var(--border); border-radius:12px; padding:13px 15px; margin-top:9px;
  cursor:pointer; font-size:14.5px; transition:border-color .12s, background .12s; }
.q label.opt:hover { border-color:var(--faint); background:#fff; }
.q label.opt.sel { border-color:var(--accent); background:var(--accent-soft); }
.q label.opt input { margin-top:3px; accent-color:var(--accent); width:16px; height:16px; flex:none; }
.q label.opt .k { font-weight:800; color:var(--muted); flex:none; width:20px; }
.q label.opt.sel .k { color:var(--accent-dark); }
.q input[type=text], .q textarea { margin-top:10px; }
.q textarea { min-height:130px; resize:vertical; }
.q-nav { display:flex; gap:10px; margin-top:18px; }
.q-tools { display:flex; gap:10px; margin-top:12px; }
.linkbtn { border:none; background:none; color:var(--muted); font-size:13px; font-weight:600;
  cursor:pointer; padding:6px 4px; display:inline-flex; align-items:center; gap:6px; }
.linkbtn:hover { color:var(--text); }
.linkbtn.on { color:var(--warn); font-weight:800; }
.linkbtn.danger:hover { color:var(--danger); }

/* ---------- modal ---------- */
.modal { position:fixed; inset:0; background:rgba(15,23,42,.55); display:grid; place-items:center;
  z-index:100; padding:16px; }
.modal-card { background:#fff; border-radius:18px; padding:26px; max-width:440px; width:100%;
  box-shadow:0 24px 64px -12px rgba(15,23,42,.4); }
.modal-card h3 { margin:0 0 4px; font-size:19px; }
.statgrid { display:grid; grid-template-columns:repeat(3,1fr); gap:10px; margin:16px 0; }
.statgrid.two { grid-template-columns:repeat(2,1fr); }
.stat { background:#f8fafc; border:1px solid var(--border); border-radius:12px; padding:12px 8px;
  text-align:center; }
.stat b { display:block; font-size:21px; }
.stat span { font-size:11px; color:var(--muted); font-weight:700; text-transform:uppercase; }
.stat.good b { color:var(--accent-dark); }
.stat.bad b { color:var(--danger); }
.stat.idle b { color:var(--faint); }
.warnline { background:var(--warn-soft); border:1px solid #fcd34d; color:#92400e; font-size:13px;
  font-weight:600; border-radius:10px; padding:10px 12px; margin-bottom:6px; }

/* ---------- result ---------- */
.ringwrap { position:relative; width:150px; margin:18px auto 4px; }
#ring-fg { stroke-dasharray:326.7; stroke-dashoffset:326.7; transition:stroke-dashoffset 1.2s ease-out; }
.ring-label { position:absolute; inset:0; display:flex; flex-direction:column; align-items:center;
  justify-content:center; }
.ring-label b { font-size:30px; letter-spacing:-.02em; }
.ring-label span { font-size:11px; color:var(--muted); text-transform:uppercase; font-weight:700; }

/* ---------- responsive ---------- */
@media (max-width:860px) {
  #exam-body { flex-direction:column; }
  #side { width:100%; position:static; padding:10px 12px; }
  #palette { grid-template-columns:repeat(10,1fr); }
  #exam-top { padding:8px 12px; gap:8px; }
  #exam-title { font-size:13px; }
  #timer { font-size:14px; padding:7px 10px; }
  #btn-submit { padding:9px 14px; font-size:13px; }
  .save b { display:none; }
  .q { padding:16px; }
  .q h3 { font-size:15.5px; }
  .card { padding:20px; }
  #codeboxes { gap:6px; }
  .cbox { width:44px; height:54px; font-size:21px; }
}
@media (max-width:420px) {
  #palette { grid-template-columns:repeat(8,1fr); }
  .cbox { width:40px; height:52px; }
  .statgrid { grid-template-columns:repeat(3,1fr); }
}

/* ---------- rich question content ---------- */
.rich { overflow-wrap:break-word; }
.rich p { margin:0 0 8px; }
.rich p:last-child { margin-bottom:0; }
.rich table { border-collapse:collapse; margin:10px 0; max-width:100%; }
.rich td, .rich th { border:1px solid var(--border-2); padding:6px 10px; font-size:14px; }
.rich img { max-width:100%; height:auto; display:block; margin:10px auto;
  border:1px solid var(--border); border-radius:10px; background:#fff;
  pointer-events:none; -webkit-user-drag:none; user-select:none; -webkit-user-select:none; }
.rich ul, .rich ol { margin:6px 0; padding-left:22px; }
.q input[type=text], .q textarea { user-select:text; -webkit-user-select:text; }
.img-retry { margin:10px auto; display:block; font-size:13px; }
#paper { -webkit-touch-callout:none; }
#paper input, #paper textarea { -webkit-touch-callout:default; }

/* ---------- identity watermark (screenshot deterrent) ---------- */
#wm { position:fixed; inset:0; z-index:5; pointer-events:none; overflow:hidden; }
#wm:empty { display:none; }
#wm span { position:absolute; font-size:22px; font-weight:800; color:#0f172a; opacity:.055;
  white-space:nowrap; transform:rotate(-18deg); user-select:none; }
#v-exam { position:relative; }

/* ---------- focus strikes ---------- */
.strikes { font-size:12px; font-weight:800; background:var(--warn-soft); color:var(--warn);
  border:1px solid #fcd34d; border-radius:999px; padding:6px 12px; white-space:nowrap; }
.strikes.hot { background:var(--danger-soft); color:var(--danger); border-color:#fca5a5; }
.ann.strike { background:var(--warn-soft); border-color:#fcd34d; color:#92400e; font-weight:600; }

/* ---------- print: never print the paper ---------- */
@media print {
  #v-exam, #modal-submit, #wm { display:none !important; }
  body::after { content:'Printing is disabled in the exam hall.'; display:block;
    text-align:center; margin-top:40px; font-weight:700; }
}

/* ---------- small-screen tightening ---------- */
@media (max-width:860px) {
  #exam-top { flex-wrap:wrap; }
  .et-left { flex:1 1 100%; order:2; }
  .et-right { order:1; width:100%; justify-content:space-between; }
  .progress { max-width:none; }
  .q-nav { flex-direction:column; }
  .q-nav .btn-primary, .q-nav .btn-ghost { width:100%; }
  .modal-card { padding:20px; }
  .hp-stats b { font-size:15px; }
}