/* Exam Simulator Pro — professional real-exam UI */
.exsim-app{
  --primary:#0b3d91;         /* deep exam blue */
  --primary-2:#1258c9;
  --accent:#0f766e;          /* teal */
  --danger:#b91c1c;
  --warn:#b45309;
  --ok:#166534;
  --ink:#0f172a;
  --ink-2:#334155;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#f8fafc;
  --card:#ffffff;
  --shadow: 0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.08);
  --radius:12px;
  color:var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height:1.5;
  box-sizing:border-box;
}
.exsim-app *,
.exsim-app *::before,
.exsim-app *::after{ box-sizing:border-box; }

/* HTML `hidden` attribute must always win over our `display:flex` rules. */
.exsim-app [hidden]{ display: none !important; }

.exsim-app .exsim-alert{
  background:#fff7ed;border:1px solid #fed7aa;color:#7c2d12;padding:16px 18px;border-radius:var(--radius);
}

/* ---------- Intro ---------- */
.exsim-intro{
  display:flex;justify-content:center;align-items:flex-start;
  padding:32px 0;
}
.exsim-intro-card{
  width:100%;max-width:820px;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);padding:40px;
}
.exsim-eyebrow{
  display:inline-block;letter-spacing:.14em;text-transform:uppercase;font-size:12px;font-weight:700;
  color:var(--primary);background:#e0ecff;padding:6px 12px;border-radius:999px;
}
.exsim-title{
  font-size:clamp(28px,4vw,40px);line-height:1.15;margin:16px 0 8px;color:var(--ink);
  font-weight:800;letter-spacing:-.01em;
}
.exsim-desc{ color:var(--ink-2); margin:6px 0 20px; }

.exsim-facts{
  list-style:none;padding:0;margin:24px 0;display:grid;grid-template-columns:repeat(4,1fr);gap:12px;
}
.exsim-facts li{
  background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:14px 16px;
}
.exsim-facts .k{ display:block;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600; }
.exsim-facts .v{ display:block;font-size:20px;font-weight:800;color:var(--ink);margin-top:4px; }

.exsim-rules{ margin-top:20px;padding:18px 20px;border:1px dashed #cbd5e1;border-radius:10px;background:#fbfdff; }
.exsim-rules h3{ margin:0 0 8px;font-size:14px;text-transform:uppercase;letter-spacing:.08em;color:var(--primary); }
.exsim-rules ul{ margin:0;padding-left:20px;color:var(--ink-2); }
.exsim-rules li{ margin:4px 0; }

.exsim-guest{
  margin-top:20px;padding:16px;border:1px solid var(--line);border-radius:10px;background:#f8fafc;
  display:grid;grid-template-columns:1fr 1fr;gap:12px;
}
.exsim-guest label{ display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:600;color:var(--ink-2); }
.exsim-guest input{
  border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:15px;font-family:inherit;
  background:#fff;color:var(--ink);
}
.exsim-guest input:focus{ outline:2px solid var(--primary-2);outline-offset:1px;border-color:var(--primary-2); }

/* ---------- Buttons ---------- */
.exsim-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:1px solid transparent;border-radius:8px;padding:10px 18px;font-size:15px;font-weight:600;
  cursor:pointer;font-family:inherit;transition:transform .05s ease, background .15s ease, box-shadow .15s ease;
  text-decoration:none;
}
.exsim-btn:active{ transform:translateY(1px); }
.exsim-btn.primary{ background:var(--primary);color:#fff; }
.exsim-btn.primary:hover{ background:var(--primary-2); }
.exsim-btn.secondary{ background:#0f172a;color:#fff; }
.exsim-btn.secondary:hover{ background:#1e293b; }
.exsim-btn.ghost{ background:#fff;color:var(--ink);border-color:var(--line); }
.exsim-btn.ghost:hover{ background:#f1f5f9; }
.exsim-btn.danger{ background:var(--danger);color:#fff; }
.exsim-btn.danger:hover{ background:#7f1d1d; }
.exsim-btn.xl{ padding:14px 28px;font-size:16px;margin-top:20px; }

/* ---------- Exam screen ---------- */
.exsim-topbar{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:14px 20px;background:linear-gradient(180deg,#0a1f4a,#0b3d91);color:#fff;
  border-radius:var(--radius) var(--radius) 0 0;
}
.exsim-topbar-left{ display:flex;flex-direction:column;gap:2px; }
.exsim-brand{ font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:#c7d2fe; }
.exsim-exam-title{ font-size:16px;font-weight:700; }
.exsim-topbar-right{ display:flex;gap:14px;align-items:center; }
.exsim-timer{
  display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);
  padding:8px 14px;border-radius:8px;font-variant-numeric:tabular-nums;font-weight:700;font-size:16px;
  border:1px solid rgba(255,255,255,.2);
}
.exsim-timer .dot{ width:8px;height:8px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 4px rgba(34,197,94,.2); }
.exsim-timer.warn .dot{ background:#f59e0b;box-shadow:0 0 0 4px rgba(245,158,11,.2); }
.exsim-timer.crit{ background:rgba(220,38,38,.2);border-color:rgba(248,113,113,.6); }
.exsim-timer.crit .dot{ background:#ef4444;box-shadow:0 0 0 4px rgba(239,68,68,.25);animation:exsim-pulse 1s infinite; }
@keyframes exsim-pulse{ 50%{ opacity:.5 } }

.exsim-layout{
  display:grid;grid-template-columns:1fr 320px;gap:0;
  background:var(--card);border:1px solid var(--line);border-top:0;border-radius:0 0 var(--radius) var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
}
.exsim-main{ padding:32px; }
.exsim-question-meta{
  display:flex;justify-content:space-between;align-items:center;color:var(--muted);
  font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;
  margin-bottom:14px;
}
.exsim-review-toggle{
  display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;color:var(--ink-2);
  padding:6px 12px;border-radius:999px;font-size:12px;font-weight:600;cursor:pointer;text-transform:none;letter-spacing:0;
}
.exsim-review-toggle:hover{ background:#fefce8;border-color:#fde68a;color:#854d0e; }
.exsim-review-toggle.on{ background:#fef3c7;border-color:#f59e0b;color:#78350f; }

.exsim-question{ padding:0; }
.exsim-question + .exsim-question{ margin-top:32px;padding-top:32px;border-top:1px solid var(--line); }
.exsim-q-text{ font-size:18px;font-weight:600;color:var(--ink);margin:0 0 6px;line-height:1.45; }
.exsim-q-hint{ font-size:13px;color:var(--muted);margin:0 0 18px; }

.exsim-options{ display:flex;flex-direction:column;gap:10px;list-style:none;padding:0;margin:0; }
.exsim-option{
  display:flex;align-items:flex-start;gap:12px;
  border:1.5px solid var(--line);border-radius:10px;padding:14px 16px;background:#fff;cursor:pointer;
  transition:all .12s ease;
}
.exsim-option:hover{ border-color:#93c5fd;background:#f0f7ff; }
.exsim-option input{ margin-top:3px;accent-color:var(--primary); width:16px;height:16px;flex-shrink:0; }
.exsim-option.selected{ border-color:var(--primary);background:#e6efff;box-shadow:0 0 0 3px rgba(11,61,145,.08); }
.exsim-option .letter{
  display:inline-flex;justify-content:center;align-items:center;
  width:26px;height:26px;border-radius:50%;background:#f1f5f9;color:var(--ink-2);
  font-weight:700;font-size:13px;flex-shrink:0;
}
.exsim-option.selected .letter{ background:var(--primary);color:#fff; }
.exsim-option .text{ flex:1;color:var(--ink);font-size:15px; }

.exsim-nav-buttons{ display:flex;justify-content:space-between;gap:12px;margin-top:32px; }

/* ---------- Sidebar navigator ---------- */
.exsim-sidebar{
  background:#f8fafc;border-left:1px solid var(--line);padding:24px 20px;
}
.exsim-sidebar h3{
  margin:0 0 12px;font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:700;
}
.exsim-legend{ display:flex;flex-wrap:wrap;gap:8px 12px;margin-bottom:16px;font-size:11px;color:var(--muted); }
.exsim-legend span{ display:inline-flex;align-items:center;gap:6px; }
.exsim-legend .sw{ width:12px;height:12px;border-radius:3px;display:inline-block;border:1px solid var(--line); }
.exsim-legend .sw.current{ background:var(--primary);border-color:var(--primary); }
.exsim-legend .sw.answered{ background:#dcfce7;border-color:#86efac; }
.exsim-legend .sw.review{ background:#fef3c7;border-color:#fbbf24; }
.exsim-legend .sw.unanswered{ background:#fff;border-color:#cbd5e1; }

.exsim-grid{ display:grid;grid-template-columns:repeat(5,1fr);gap:8px; }
.exsim-grid button{
  aspect-ratio:1/1;border-radius:6px;border:1.5px solid var(--line);background:#fff;color:var(--ink-2);
  cursor:pointer;font-weight:700;font-size:13px;font-family:inherit;position:relative;
  transition:all .1s ease;
}
.exsim-grid button:hover{ background:#f1f5f9;border-color:#94a3b8; }
.exsim-grid button.answered{ background:#dcfce7;border-color:#86efac;color:#166534; }
.exsim-grid button.review{ background:#fef3c7;border-color:#fbbf24;color:#854d0e; }
.exsim-grid button.review.answered::after{
  content:'';position:absolute;top:3px;right:3px;width:6px;height:6px;background:#166534;border-radius:50%;
}
.exsim-grid button.current{ background:var(--primary);border-color:var(--primary);color:#fff; }
.exsim-grid button.current.answered{ background:var(--primary);color:#fff; }

.exsim-summary{
  margin-top:20px;padding-top:16px;border-top:1px solid var(--line);
  display:flex;flex-direction:column;gap:8px;font-size:13px;color:var(--ink-2);
}
.exsim-summary b{ color:var(--ink);margin-right:6px;font-size:15px; }

/* ---------- Result ---------- */
.exsim-result-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:40px;text-align:center;
}
.exsim-result-status{
  display:inline-block;padding:6px 16px;border-radius:999px;
  font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;
}
.exsim-result-status.pass{ background:#dcfce7;color:#166534; }
.exsim-result-status.fail{ background:#fee2e2;color:#991b1b; }
.exsim-result-title{ font-size:32px;font-weight:800;margin:14px 0 20px;color:var(--ink); }
.exsim-score-ring{ position:relative;width:180px;height:180px;margin:20px auto; }
.exsim-score-ring svg{ width:100%;height:100%;transform:rotate(-90deg); }
.ring-track{ fill:none;stroke:#e2e8f0;stroke-width:10; }
.ring-progress{ fill:none;stroke:var(--primary);stroke-width:10;stroke-linecap:round;
  stroke-dasharray:326.72;stroke-dashoffset:326.72;transition:stroke-dashoffset 1s ease-out; }
.pass .ring-progress, .exsim-result-card.pass .ring-progress{ stroke:#16a34a; }
.fail .ring-progress, .exsim-result-card.fail .ring-progress{ stroke:#dc2626; }
.exsim-score-text{
  position:absolute;inset:0;display:flex;justify-content:center;align-items:center;flex-direction:column;
  font-size:44px;font-weight:800;color:var(--ink);
}
.exsim-score-text small{ font-size:16px;color:var(--muted);font-weight:600; }

.exsim-result-stats{
  list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:24px 0;padding:0;
}
.exsim-result-stats li{
  background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:14px 8px;
}
.exsim-result-stats b{ display:block;font-size:22px;color:var(--ink);font-weight:800; }
.exsim-result-stats span{ display:block;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-top:4px; }
.exsim-result-actions{ display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:16px; }

/* Review */
.exsim-review{ margin-top:24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px; }
.exsim-review h3{ margin:0 0 20px;font-size:18px;color:var(--ink); }
.exsim-review-item{ padding:20px 0;border-top:1px solid var(--line); }
.exsim-review-item:first-of-type{ border-top:0;padding-top:0; }
.exsim-review-item .badge{
  display:inline-block;padding:3px 10px;border-radius:999px;font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
}
.exsim-review-item .badge.ok{ background:#dcfce7;color:#166534; }
.exsim-review-item .badge.no{ background:#fee2e2;color:#991b1b; }
.exsim-review-item .q{ font-weight:600;margin:8px 0 12px;color:var(--ink); }
.exsim-review-opts{ list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px; }
.exsim-review-opts li{
  padding:10px 14px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:14px;
  display:flex;align-items:center;gap:10px;color:var(--ink-2);
}
.exsim-review-opts li.correct{ background:#f0fdf4;border-color:#86efac;color:#14532d;font-weight:600; }
.exsim-review-opts li.wrong{ background:#fef2f2;border-color:#fca5a5;color:#7f1d1d; }
.exsim-review-opts .tag{ font-size:11px;padding:2px 8px;border-radius:4px;background:#fff;border:1px solid currentColor;font-weight:600;margin-left:auto; }
.exsim-review-explain{ margin-top:12px;padding:12px 16px;background:#f0f9ff;border-left:3px solid var(--primary);border-radius:0 8px 8px 0;color:var(--ink-2);font-size:14px; }
.exsim-review-explain b{ color:var(--primary); }

/* Loading */
.exsim-loading{
  position:fixed;inset:0;background:rgba(15,23,42,.5);display:flex;justify-content:center;align-items:center;
  z-index:99999;
}
.exsim-spinner{
  width:52px;height:52px;border:5px solid rgba(255,255,255,.3);border-top-color:#fff;
  border-radius:50%;animation:exsim-spin 1s linear infinite;
}
@keyframes exsim-spin{ to{ transform:rotate(360deg) } }

/* Responsive */
@media (max-width: 900px){
  .exsim-facts{ grid-template-columns:repeat(2,1fr); }
  .exsim-layout{ grid-template-columns:1fr; }
  .exsim-sidebar{ border-left:0;border-top:1px solid var(--line); }
  .exsim-grid{ grid-template-columns:repeat(8,1fr); }
  .exsim-guest{ grid-template-columns:1fr; }
  .exsim-topbar{ flex-wrap:wrap;padding:12px 14px; }
  .exsim-result-stats{ grid-template-columns:repeat(2,1fr); }
  .exsim-main{ padding:22px; }
  .exsim-intro-card{ padding:24px; }
}