:root {
  --bg: #0f1115;
  --card: #151923;
  --text: #e6e8ee;
  --muted: #aab0c0;
  --ok: #21c35e;
  --err: #ff5c5c;
  --brand: #4ea1ff;
}

* { box-sizing: border-box; }
body {
  margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Arial, sans-serif;
  background: linear-gradient(180deg, #0b0d12, var(--bg));
  color: var(--text);
}
.wrap { max-width: 880px; margin: 0 auto; padding: 24px; }
header { text-align: center; margin-bottom: 24px; }
h1 { margin: 0 0 4px; font-size: 28px; }
.subtitle { color: var(--muted); margin: 0; }

.card {
  background: var(--card);
  border: 1px solid #242b3a;
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
}
.card + .card { margin-top: 16px; }

.ok h2 { color: var(--ok); }
.error h2 { color: var(--err); }

ul.info { list-style: none; padding: 0; margin: 0 0 12px; }
ul.info li { padding: 6px 0; border-bottom: 1px dashed #2a3142; }
ul.info li:last-child { border-bottom: 0; }

.syllabus { margin-top: 8px; line-height: 1.55; color: var(--text); }
.syllabus ul, .syllabus ol { padding-left: 20px; }

form { display: flex; gap: 10px; flex-wrap: wrap; }
input[type="text"] {
  flex: 1 1 260px;
  background: #0f1320; border: 1px solid #2a3142; border-radius: 10px;
  color: var(--text); padding: 12px 14px; outline: none;
}
button, .btn {
  display: inline-block; background: var(--brand); color: #0a0c12;
  border: none; border-radius: 10px; padding: 12px 16px; font-weight: 600;
  text-decoration: none; cursor: pointer;
}
button:hover, .btn:hover { filter: brightness(1.05); }

.hash { color: var(--muted); margin-top: 12px; }

footer { margin-top: 32px; text-align: center; color: var(--muted); font-size: 14px; }