:root {
  --brand: #2f6f4f;
  --brand-dark: #204d37;
  --bg: #f4f6f4;
  --card: #ffffff;
  --text: #1e2422;
  --muted: #6b7570;
  --border: #dde3df;
  --ok: #2f6f4f;
  --bad: #b6402f;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  background: linear-gradient(135deg, var(--brand-dark), #12271b);
  color: #fff;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar h1 {
  font-size: 1.05rem;
  margin: 0;
  font-weight: 600;
}

.topbar .sub {
  font-size: 0.8rem;
  opacity: 0.85;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-skull { flex-shrink: 0; color: #fff; }
.greeting-extra {
  display: block;
  font-weight: 600;
  opacity: 1;
  margin-top: 2px;
}

.topbar nav a, .topbar button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #fff;
  text-decoration: none;
  margin-left: 14px;
  font-size: 0.9rem;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
}

.topbar nav a:hover, .topbar button:hover { background: rgba(255,255,255,0.12); }
.topbar nav svg { flex-shrink: 0; }

@media (max-width: 600px) {
  .topbar nav a, .topbar button { margin-left: 6px; padding: 8px; }
  .topbar nav .nav-label { display: none; }
}

.container {
  max-width: 780px;
  margin: 30px auto;
  padding: 0 16px;
}

.container.wide { max-width: 1100px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

h2 { margin-top: 0; }

label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin: 14px 0 6px;
}

input[type=text], input[type=password], input[type=number], select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}

button.primary {
  background: var(--brand);
  color: #fff;
  border: none;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 18px;
}
button.primary:hover { background: var(--brand-dark); }

button.secondary {
  background: #fff;
  color: var(--brand-dark);
  border: 1px solid var(--brand);
  padding: 9px 16px;
  border-radius: 8px;
  cursor: pointer;
}

button.danger { color: var(--bad); border-color: var(--bad); background: #fff; border: 1px solid var(--bad); padding: 6px 12px; border-radius: 6px; cursor: pointer; }

.error {
  color: var(--bad);
  font-size: 0.9rem;
  margin-top: 10px;
}

.checkbox-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}
.checkbox-list label {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 12px;
  font-size: 0.85rem;
  color: var(--text);
  margin: 0;
  cursor: pointer;
}
.checkbox-list input { margin: 0; }

.timer {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.1rem;
}
.timer.low { color: var(--bad); }

.progress {
  font-size: 0.85rem;
  color: var(--muted);
}

.question-block { margin-bottom: 10px; }
.question-text { font-weight: 600; margin-bottom: 12px; }
.tag {
  display: inline-block;
  background: #e7efe9;
  color: var(--brand-dark);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 12px;
  margin-bottom: 8px;
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 8px;
  cursor: pointer;
}
.option:hover { border-color: var(--brand); }
.option.selected { border-color: var(--brand); background: #eef6f0; }
.option input { margin-top: 3px; }

.exam-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
}

.question-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.question-grid button {
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0;
}
.question-grid button:hover { border-color: var(--brand); }
.question-grid button.answered { background: #e4e6e4; border-color: #c9cdc9; color: var(--muted); }
.question-grid button.current { border-color: var(--brand); border-width: 2px; font-weight: 700; color: var(--brand-dark); }

.question-block { touch-action: pan-y; }

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; }

.tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.tabs button {
  background: #fff; border: 1px solid var(--border); padding: 8px 16px;
  border-radius: 8px; cursor: pointer; font-size: 0.9rem;
}
.tabs button.active { background: var(--brand); color: #fff; border-color: var(--brand); }

.score-big { font-size: 2.4rem; font-weight: 700; color: var(--brand-dark); }
.score-sub { color: var(--muted); }

.review-item { border: 1px solid var(--border); border-radius: 8px; padding: 14px; margin-bottom: 10px; }
.review-item.correct { border-left: 4px solid var(--ok); }
.review-item.incorrect { border-left: 4px solid var(--bad); }
.review-opt { padding: 4px 0; font-size: 0.9rem; }
.review-opt.is-correct { color: var(--ok); font-weight: 600; }
.review-opt.is-wrong-selected { color: var(--bad); font-weight: 600; text-decoration: line-through; }
.explanation { margin-top: 8px; font-size: 0.85rem; color: var(--muted); background: #f4f6f4; padding: 8px 10px; border-radius: 6px; }

.hint-btn {
  background: #fff8e6;
  color: #8a6300;
  border: 1px solid #f0d488;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  margin-top: 6px;
}
.hint-btn:hover { background: #fdefc7; }
.hint-btn.used, .hint-btn:disabled { opacity: 0.65; cursor: default; }
.hint-box {
  margin-top: 8px;
  font-size: 0.88rem;
  color: #6b5500;
  background: #fff8e6;
  border: 1px solid #f0d488;
  border-radius: 8px;
  padding: 10px 12px;
}
.hint-badge { font-size: 0.85em; }

.hidden { display: none !important; }

.hint { font-size: 0.8rem; color: var(--muted); margin-top: 4px; }

.form-row { display: flex; gap: 12px; }
.form-row > div { flex: 1; }

@media (max-width: 600px) {
  .container { margin: 12px auto; }
  .card { padding: 16px; }
}