/* TMUA Practice — interface styled after the official UAT-UK / TMUA look
   (Poppins typeface, deep navy #293D56, TMUA magenta accent). */
:root {
  --navy: #293d56;
  --navy-dark: #213145;
  --navy-soft: #eef2f7;
  --accent: #95268f;
  --accent-dark: #7b1f76;
  --accent-soft: #f7eef6;
  --slate: #61778f;
  --slate-light: #a0bbcc;
  --success: #20a86a;
  --success-soft: #e9f7f0;
  --danger: #dc3545;
  --danger-soft: #fdecec;
  --warn: #ff6200;
  --warn-soft: #fff2e8;
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #293d56;
  --muted: #61778f;
  --border: #e6ebf1;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(33, 49, 69, 0.08);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { font-size: 16px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: "Poppins", -apple-system, "Segoe UI", system-ui, sans-serif;
  line-height: 1.6;
}
main { max-width: 880px; margin: 0 auto; padding: 16px 14px 90px; }
a { color: var(--accent); }

/* ---------- Header ---------- */
header.appbar {
  background: var(--navy); color: #fff; padding: 14px 18px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  position: sticky; top: 0; z-index: 20; box-shadow: var(--shadow);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-badge {
  flex: 0 0 auto; display: flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  font-weight: 700; font-size: .72rem; letter-spacing: .5px; color: #fff;
}
.brand .title { font-size: 1.02rem; font-weight: 600; line-height: 1.2; }
.brand .sub { font-size: .74rem; opacity: .78; line-height: 1.2; }
header.appbar .actions { display: flex; align-items: center; gap: 12px; }
header.appbar a {
  color: #fff; text-decoration: none; font-size: .85rem; opacity: .9;
  padding: 6px 12px; border: 1px solid rgba(255,255,255,.35); border-radius: 8px;
}
header.appbar a:hover { background: rgba(255,255,255,.12); opacity: 1; }
.timer {
  font-variant-numeric: tabular-nums; font-weight: 700; font-size: .95rem;
  background: rgba(255,255,255,.12); padding: 5px 12px; border-radius: 8px;
  white-space: nowrap;
}
.timer.low { background: var(--danger); }

/* ---------- Cards ---------- */
.card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 20px 18px; margin-bottom: 14px; border: 1px solid var(--border);
}
h2.card-title { margin: 0 0 12px; font-size: 1.04rem; font-weight: 600; color: var(--navy); }
.muted { color: var(--muted); font-size: .85rem; }

/* ---------- Login ---------- */
.login-wrap {
  min-height: calc(100vh - 60px); display: flex; align-items: center;
  justify-content: center; padding: 24px 16px;
}
.login-card { width: 100%; max-width: 420px; }
.login-card .brand { justify-content: center; text-align: center; flex-direction: column; gap: 8px; margin-bottom: 6px; }
.login-card .brand .sub { color: var(--slate); font-size: .8rem; }
.login-rule { text-align: center; }
.login-rule h1 { font-size: 1.25rem; font-weight: 700; margin: 4px 0 2px; color: var(--navy); }
.login-rule p { margin: 0; color: var(--muted); font-size: .86rem; }
.error-msg {
  display: none; margin: 12px 0 0; padding: 10px 12px; border-radius: 8px;
  background: var(--danger-soft); color: var(--danger); font-size: .86rem;
}
.error-msg.show { display: block; }

/* ---------- Forms ---------- */
input[type=text], input[type=password], select {
  width: 100%; padding: 11px 13px; border: 1px solid var(--border); border-radius: 8px;
  font-size: .95rem; background: #fff; color: var(--text); outline: none;
  font-family: inherit;
}
input:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: .83rem; font-weight: 600; color: var(--slate); margin-bottom: 6px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--navy); color: #fff; border: none; border-radius: 8px;
  padding: 11px 20px; font-size: .95rem; font-weight: 600; cursor: pointer;
  text-decoration: none; font-family: inherit; transition: background .15s;
}
.btn:hover { background: var(--navy-dark); }
.btn:disabled { background: #b9c4d3; cursor: not-allowed; }
.btn.secondary { background: #fff; color: var(--navy); border: 1.5px solid var(--navy); }
.btn.secondary:hover { background: var(--navy-soft); }
.btn.accent { background: var(--accent); }
.btn.accent:hover { background: var(--accent-dark); }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #b02a37; }
.btn.small { padding: 6px 12px; font-size: .82rem; }
.btn.block { width: 100%; }

/* ---------- Paper selection ---------- */
.paper-item {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  border: 1px solid var(--border); border-radius: 10px; padding: 16px; margin-bottom: 10px;
  background: #fff; transition: border-color .12s;
}
.paper-item:hover { border-color: var(--slate-light); }
.paper-item .p-name { font-weight: 600; color: var(--navy); }
.paper-item .p-meta { font-size: .8rem; color: var(--muted); margin-top: 2px; }
.welcome { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.welcome .hello { color: var(--muted); font-size: .88rem; }
.welcome .who { font-weight: 700; color: var(--navy); }

/* ---------- Quiz ---------- */
.q-toolbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 10px; font-size: .88rem; color: var(--muted); gap: 10px;
}
.q-toolbar .spacer { flex: 1; }
.q-num { font-weight: 700; color: var(--accent); }
.statement { font-size: 1.02rem; margin: 4px 0 12px; overflow-x: auto; }
.figure { text-align: center; margin: 8px 0 14px; overflow-x: auto; }
.figure img { max-width: 100%; height: auto; }
.figure img.wide { width: 560px; max-width: none; }
.fig-note { font-size: .78rem; color: var(--muted); margin-top: 4px; }

.opts { list-style: none; margin: 0; padding: 0; }
.opts li { margin-bottom: 8px; }
.opt {
  display: flex; gap: 10px; align-items: flex-start; padding: 12px 13px;
  border: 1.5px solid var(--border); border-radius: 10px; cursor: pointer;
  background: #fff; transition: border-color .12s, background .12s;
}
.opt:hover { border-color: var(--slate-light); }
.opt.selected { border-color: var(--accent); background: var(--accent-soft); }
.opt input { margin-top: 5px; accent-color: var(--accent); }
.opt .opt-letter { font-weight: 700; color: var(--accent); min-width: 1.4em; }
.opt .opt-body { flex: 1; overflow-x: auto; }

.flag-btn {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  border: 1.5px solid var(--border); background: #fff; color: var(--muted);
  border-radius: 8px; padding: 7px 13px; font-size: .84rem; font-weight: 600;
  font-family: inherit;
}
.flag-btn:hover { border-color: var(--warn); color: var(--warn); }
.flag-btn.flagged { background: var(--warn-soft); border-color: var(--warn); color: var(--warn); }

/* Question palette (test-player style) */
.palette-title { font-size: .8rem; font-weight: 600; color: var(--muted); margin: 4px 0 8px; }
.dots { display: flex; flex-wrap: wrap; gap: 7px; margin: 12px 0 4px; }
.dot {
  position: relative; width: 38px; height: 38px; border-radius: 8px;
  border: 1.5px solid var(--border); display: flex; align-items: center;
  justify-content: center; font-size: .8rem; font-weight: 600; cursor: pointer;
  background: #fff; color: var(--muted);
}
.dot.answered { background: var(--navy); border-color: var(--navy); color: #fff; }
.dot.current { outline: 2.5px solid var(--accent); outline-offset: 2px; }
.dot.flagged::after {
  content: ""; position: absolute; top: -4px; right: -4px; width: 10px; height: 10px;
  border-radius: 50%; background: var(--warn); border: 2px solid #fff;
}

.quiz-footer {
  position: fixed; left: 0; right: 0; bottom: 0; background: #fff;
  border-top: 1px solid var(--border); padding: 10px 14px; z-index: 30;
  display: flex; gap: 10px; align-items: center; justify-content: center;
}
.quiz-footer .btn { min-width: 100px; }

/* ---------- Result ---------- */
.score-hero { text-align: center; padding: 26px 16px; }
.score-big { font-size: 2.7rem; font-weight: 800; color: var(--navy); line-height: 1.1; }
.score-big small { font-size: 1.1rem; color: var(--muted); font-weight: 500; }
.tagbar-row { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-size: .85rem; }
.tagbar-row .tag-name { min-width: 4em; }
.tagbar-row .bar-track { flex: 1; height: 10px; border-radius: 5px; background: var(--navy-soft); overflow: hidden; }
.tagbar-row .bar-fill { height: 100%; background: var(--accent); border-radius: 5px; }
.tagbar-row .tag-val { min-width: 4.5em; text-align: right; color: var(--muted); }

.rv-q { border: 1px solid var(--border); border-radius: 10px; padding: 16px; margin-bottom: 12px; background: #fff; }
.rv-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; gap: 8px; }
.badge { font-size: .74rem; font-weight: 700; padding: 3px 11px; border-radius: 999px; white-space: nowrap; }
.badge.ok { background: var(--success-soft); color: var(--success); }
.badge.no { background: var(--danger-soft); color: var(--danger); }
.rv-opts .opt { cursor: default; }
.rv-opts .opt.right { border-color: var(--success); background: var(--success-soft); }
.rv-opts .opt.wrong-pick { border-color: var(--danger); background: var(--danger-soft); }
.solution {
  margin-top: 10px; padding: 11px 13px; background: #f8fafc; border-left: 3px solid var(--accent);
  border-radius: 6px; font-size: .9rem; overflow-x: auto;
}
.solution .sol-label { font-size: .78rem; font-weight: 700; color: var(--accent); margin-bottom: 4px; }

/* ---------- Admin ---------- */
table.grid { width: 100%; border-collapse: collapse; font-size: .85rem; }
table.grid th, table.grid td { padding: 8px 8px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
table.grid th { color: var(--muted); font-weight: 600; font-size: .78rem; }
.table-wrap { overflow-x: auto; }
.admin-toolbar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; align-items: center; }
.admin-toolbar select, .admin-toolbar input { width: auto; }

/* ---------- Modal / toast ---------- */
.modal-mask {
  position: fixed; inset: 0; background: rgba(33, 49, 69, .5); z-index: 50;
  display: none; align-items: center; justify-content: center; padding: 16px;
}
.modal-mask.show { display: flex; }
.modal {
  background: #fff; border-radius: 14px; padding: 22px; max-width: 500px; width: 100%;
  max-height: 85vh; overflow-y: auto;
}
.toast {
  position: fixed; top: 66px; left: 50%; transform: translateX(-50%);
  background: rgba(33, 49, 69, .95); color: #fff; padding: 9px 20px; border-radius: 999px;
  font-size: .85rem; z-index: 60; opacity: 0; transition: opacity .2s; pointer-events: none;
}
.toast.show { opacity: 1; }

.katex-display { margin: .4em 0; }
@media (max-width: 600px) {
  .quiz-footer .btn { min-width: 84px; padding: 10px 12px; }
  .brand .sub { display: none; }
}