:root {
  --bg: #0b0f1a;
  --bg-2: #121829;
  --card: #161e33;
  --card-2: #1c2742;
  --border: #26324e;
  --text: #e8ecf7;
  --muted: #8b96b0;
  --accent: #6c5ce7;
  --accent-2: #00d2ff;
  --good: #2ecc71;
  --bad: #ff5c7a;
  --gold: #ffd166;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --mono: 'Cascadia Code', Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

nav {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 14px 24px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand { font-weight: 800; font-size: 1.15rem; letter-spacing: 0.02em; }
.brand span { color: var(--accent-2); }

nav a.nav-link {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 6px 10px;
  border-radius: 8px;
}
nav a.nav-link:hover { color: var(--text); background: var(--card); text-decoration: none; }
nav .spacer { flex: 1; }
nav .user-chip { font-size: 0.85rem; color: var(--muted); }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  background: var(--card-2);
  color: var(--text);
  border: 1px solid var(--border);
  transition: transform 0.08s ease, background 0.15s ease, box-shadow 0.15s ease;
}
button:hover { background: #243157; }
button:active { transform: translateY(1px); }
button.primary {
  background: linear-gradient(135deg, var(--accent), #8f7bff);
  border: none;
  box-shadow: 0 4px 18px rgba(108, 92, 231, 0.4);
}
button.primary:hover { box-shadow: 0 6px 24px rgba(108, 92, 231, 0.55); }
button.ghost { background: transparent; }
button:disabled { opacity: 0.45; cursor: not-allowed; }

main { max-width: 1080px; margin: 0 auto; padding: 32px 24px 80px; }

.hero { text-align: center; padding: 48px 0 32px; }
.hero h1 { font-size: 2.6rem; line-height: 1.15; margin: 0 0 12px; }
.hero .grad {
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.sub { color: var(--muted); font-size: 1.1rem; max-width: 640px; margin: 0 auto; }

.pill {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--card-2);
  border: 1px solid var(--border);
  color: var(--gold);
  margin-bottom: 14px;
}

.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; }
.card p { color: var(--muted); font-size: 0.9rem; line-height: 1.55; margin: 0 0 14px; }
.card .price { font-size: 1.7rem; font-weight: 800; }
.card .price small { font-size: 0.8rem; color: var(--muted); font-weight: 400; }
.badge-soon {
  font-size: 0.72rem;
  background: var(--bad);
  color: #fff;
  border-radius: 6px;
  padding: 3px 8px;
  margin-left: 8px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.badge-now { background: var(--good); }

form .field { margin-bottom: 14px; }
form label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 6px; }
form input, form select {
  width: 100%;
  padding: 11px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
}
form input:focus, form select:focus { outline: 2px solid var(--accent); border-color: transparent; }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(120px);
  background: var(--card-2);
  border: 1px solid var(--border);
  padding: 14px 22px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease;
  z-index: 50;
  max-width: 90vw;
}
.toast.show { transform: translateX(-50%) translateY(0); }

.score-ticker {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 18px;
  min-width: 110px;
  text-align: center;
}
.stat .label { font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.stat .value { font-size: 1.4rem; font-weight: 800; }

.option-list { display: grid; gap: 12px; }
.option {
  text-align: left;
  padding: 14px 16px;
  font-weight: 500;
  border-radius: 12px;
  background: var(--card-2);
  border: 1px solid var(--border);
  font-size: 1rem;
}
.option:hover { border-color: var(--accent); }
.option.correct { border-color: var(--good); background: rgba(46, 204, 113, 0.15); }
.option.wrong { border-color: var(--bad); background: rgba(255, 92, 122, 0.15); }

.explainer {
  border-left: 4px solid var(--accent-2);
  background: var(--bg-2);
  padding: 14px 18px;
  border-radius: 0 12px 12px 0;
  margin-top: 16px;
  font-size: 0.95rem;
  line-height: 1.6;
}

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
th { color: var(--muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; }
td.rank { font-weight: 800; }
.rank-1 { color: var(--gold); }

.leaderboard-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.leaderboard-controls button.active { background: var(--accent); border-color: var(--accent); }

.modal {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 16, 0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 60;
}
.modal.show { display: flex; }
.modal .card { width: min(420px, 92vw); }
.modal .close { float: right; }

code, pre {
  font-family: var(--mono);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px 6px;
  font-size: 0.9em;
}
pre { padding: 14px; overflow-x: auto; }

.hidden { display: none !important; }
.center { text-align: center; }
.muted { color: var(--muted); }
.mt { margin-top: 18px; }
.small { font-size: 0.82rem; }