/* US Xplore — IELTS Practice · premium styles */
:root {
  --navy: #0a2540;
  --navy-light: #143a5c;
  --navy-dark: #071a2e;
  --green: #16a34a;
  --green-dark: #15803d;
  --green-light: #dcfce7;
  --green-accent: #4ade80;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --danger: #dc2626;
  --success: #16a34a;
  --radius: 16px;
  --shadow-sm: 0 1px 3px rgba(10,37,64,.08);
  --shadow-md: 0 4px 12px rgba(10,37,64,.08), 0 2px 4px rgba(10,37,64,.04);
  --shadow-lg: 0 12px 32px rgba(10,37,64,.12), 0 4px 8px rgba(10,37,64,.06);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  background: var(--bg);
  background-image: radial-gradient(circle at 50% 0%, rgba(22,163,74,.03) 0%, transparent 50%);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 20px 16px 60px; }
.wrap.narrow { max-width: 560px; }
.wrap.wide { max-width: 1100px; }
@media (min-width: 900px) {
  body.quiz .wrap { max-width: none; padding-left: 48px; padding-right: 48px; }
}

/* Header — premium navy gradient */
.topbar {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, var(--navy-light) 100%);
  color: #fff;
  padding: 32px 16px 28px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.topbar::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at 30% 20%, rgba(22,163,74,.12) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 80%, rgba(255,255,255,.04) 0%, transparent 50%);
  pointer-events: none;
}
.topbar h1 { margin: 0 0 6px; font-size: 1.75rem; font-weight: 800; letter-spacing: -.02em; position: relative; }
.topbar h1 .accent { color: var(--green-accent); }
.topbar p { margin: 0; opacity: .8; font-size: .95rem; font-weight: 400; position: relative; }

/* Cards — premium with depth */
.card {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  padding: 28px 26px;
  margin-top: 20px;
  transition: box-shadow .2s ease;
}
.card h2 { margin-top: 0; color: var(--navy); font-weight: 700; letter-spacing: -.01em; font-size: 1.25rem; }
.hint { color: var(--muted); font-size: .9rem; }

/* Forms */
label { display: block; font-weight: 600; margin: 14px 0 6px; color: var(--navy); }
input[type=text], input[type=tel], input[type=password], input[type=email], input[type=number], select {
  width: 100%;
  padding: 13px 16px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  background: #fff;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(22,163,74,.12);
}

/* Buttons — premium green CTA */
.btn {
  display: inline-block;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-dark) 100%);
  color: #fff;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .01em;
  padding: 14px 28px;
  border-radius: 12px;
  margin-top: 20px;
  box-shadow: 0 4px 12px rgba(22,163,74,.25);
  transition: all .2s ease;
  text-decoration: none;
  text-align: center;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(22,163,74,.35); }
.btn:active { transform: translateY(0); }
.btn.block { display: block; width: 100%; }
.btn.ghost { background: #e7eef4; color: var(--navy); box-shadow: none; }
.btn.ghost:hover { background: #d7e2ec; box-shadow: var(--shadow-sm); }
.btn.danger { background: var(--danger); box-shadow: 0 4px 12px rgba(220,38,38,.25); }
.btn.small { font-size: .85rem; padding: 8px 14px; margin-top: 0; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

/* Exam */
.exam-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--navy); color: #fff;
  padding: 10px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
}
.exam-header .timer {
  font-weight: 800; font-size: 1.15rem; background: rgba(255,255,255,.12);
  padding: 6px 14px; border-radius: 999px; white-space: nowrap;
}
.exam-header .timer.low { background: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .6; } }
.progress { height: 8px; background: #dfe7ee; border-radius: 999px; overflow: hidden; margin-top: 14px; }
.progress > div { height: 100%; background: var(--green); width: 0; transition: width .25s; }

.q-num { color: var(--green); font-weight: 800; font-size: .9rem; text-transform: uppercase; letter-spacing: 1px; }
.q-text { font-size: 1.25rem; font-weight: 600; color: var(--navy); margin: 8px 0 18px; }
.scenario { background: #f0fdf4; border-left: 4px solid var(--green); padding: 10px 14px; border-radius: 0 8px 8px 0; font-size: .95rem; font-weight: 400; color: #33475b; margin-bottom: 12px; }
.setpick { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 6px 0 18px; }
.setcard { border: 2px solid var(--border); border-radius: 12px; padding: 14px; cursor: pointer; transition: all .15s; background: #fff; }
.setcard:hover { border-color: var(--green); box-shadow: var(--shadow-sm); }
.setcard.sel { border-color: var(--green); background: var(--green-light); }
.setcard b { display: block; color: var(--navy); margin-bottom: 4px; }
.setcard small { color: var(--muted); }
.opt {
  display: block; width: 100%; text-align: left;
  border: 2px solid var(--border); background: #fff; border-radius: 14px;
  padding: 16px 18px; margin: 10px 0; font-size: 1.02rem; cursor: pointer;
  transition: all .15s ease;
  box-shadow: var(--shadow-sm);
}
.opt:hover { border-color: var(--green); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.opt.selected { border-color: var(--green); background: var(--green-light); font-weight: 600; box-shadow: 0 0 0 3px rgba(22,163,74,.12); }
.opt .letter {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  background: #e7eef4; color: var(--navy); font-weight: 800; font-size: .85rem;
  margin-right: 10px;
}
.opt.selected .letter { background: var(--green); color: #fff; }
.exam-nav { display: flex; justify-content: space-between; gap: 10px; margin-top: 24px; }
.exam-nav .btn { margin-top: 0; flex: 1; }

.navigator {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
  gap: 8px; margin-top: 12px;
}
.nav-dot {
  border: 2px solid var(--border); background: #fff; border-radius: 10px;
  padding: 8px 0; text-align: center; cursor: pointer; font-weight: 700; color: var(--muted);
  transition: all .15s;
}
.nav-dot.answered { background: var(--green); border-color: var(--green); color: #fff; }
.nav-dot.current { border-color: var(--green); box-shadow: 0 0 0 3px rgba(22,163,74,.2); }

/* Result */
.score-hero { text-align: center; padding: 10px 0 6px; }
.score-ring {
  width: 150px; height: 150px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 2rem; font-weight: 800; color: #fff; margin: 10px 0;
  box-shadow: var(--shadow-lg);
}
.score-ring.pass { background: linear-gradient(135deg, var(--green), var(--green-dark)); }
.score-ring.fail { background: linear-gradient(135deg, #dc2626, #991b1b); }
.badge {
  display: inline-block; padding: 5px 16px; border-radius: 999px;
  font-weight: 800; letter-spacing: .5px; font-size: .9rem;
}
.badge.pass { background: var(--green-light); color: #146c38; }
.badge.fail { background: #fee2e2; color: #991b1b; }
.review-item { border-top: 1px solid var(--border); padding: 14px 0; }
.review-item .rq { font-weight: 700; color: var(--navy); }
.review-item .ra { margin-top: 6px; font-size: .95rem; }
.ra .ok { color: var(--success); font-weight: 700; }
.ra .bad { color: var(--danger); font-weight: 700; }

/* Admin */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-top: 18px; }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 16px; text-align: center; box-shadow: var(--shadow-md); }
.stat .n { font-size: 1.8rem; font-weight: 800; color: var(--navy); }
.stat .l { font-size: .85rem; color: var(--muted); }
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 18px; }
.toolbar input { flex: 1; min-width: 180px; margin: 0; }
table.results { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: .92rem; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); border: 1px solid var(--border); }
table.results th, table.results td { padding: 10px 12px; text-align: left; border-bottom: 1px solid #edf1f5; }
table.results th { background: var(--navy); color: #fff; font-size: .82rem; text-transform: uppercase; letter-spacing: .5px; }
table.results tr:hover td { background: #f8fafc; cursor: pointer; }
.modal-back {
  position: fixed; inset: 0; background: rgba(10,37,64,.55);
  display: none; align-items: flex-start; justify-content: center; padding: 30px 14px; z-index: 100;
  overflow-y: auto; backdrop-filter: blur(4px);
}
.modal-back.open { display: flex; }
.modal { background: #fff; border-radius: var(--radius); max-width: 720px; width: 100%; padding: 28px; box-shadow: var(--shadow-lg); }
.notice { background: #fefce8; border: 1px solid #fde68a; color: #854d0e; border-radius: 10px; padding: 12px 16px; margin-top: 16px; font-size: .92rem; }
.footer { text-align: center; color: var(--muted); font-size: .85rem; margin-top: 40px; }
@media (max-width: 560px) {
  .card { padding: 20px 16px; }
  .q-text { font-size: 1.1rem; }
  table.results th:nth-child(4), table.results td:nth-child(4) { display: none; }
}

/* ---------- printable review paper ---------- */
#printArea { display: none; }
@media print {
  body > *:not(#printArea) { display: none !important; }
  #printArea { display: block !important; color: #000; font-size: 12px; }
  #printArea .phead h1 { font-size: 18px; margin: 0 0 6px; }
  #printArea .phead p { margin: 2px 0; }
  #printArea .pq { page-break-inside: avoid; margin: 12px 0; }
  #printArea .pqtext { margin: 4px 0; }
  #printArea .pscen { background: #f0f0f0; padding: 6px 8px; margin: 4px 0; }
  #printArea .popt { margin: 1px 0 1px 16px; }
  #printArea .pok { color: #0a7d2c; }
  #printArea .pbad { color: #c00; }
}

/* Official US Xplore logo in the header */
.brand-logo { display:inline-block; background:#fff; border-radius:16px; padding:10px 14px; margin-bottom:10px; box-shadow:var(--shadow-md); }
.brand-logo img { display:block; width:150px; max-width:46vw; height:auto; border-radius:8px; }