:root {
  --bg: #0a0a0a;
  --fg: #e6e6e6;
  --red: #ff2b3f;
  --green: #00ff66;
  --card: #131313;
  --border: #262626;
}
* { box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Courier New', monospace;
  margin: 0;
  min-height: 100vh;
}
.topnav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 32px;
  border-bottom: 1px solid var(--border);
  background: #050505;
}
.topnav a { color: var(--fg); text-decoration: none; margin-left: 20px; }
.topnav a:hover { color: var(--red); }
.brand { font-weight: bold; font-size: 1.2rem; }
.brand span { color: var(--red); }
.container { max-width: 1000px; margin: 0 auto; padding: 40px 24px; }
h1, h2, h3 { color: var(--fg); }
h1 { border-left: 4px solid var(--red); padding-left: 12px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
  margin-top: 24px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
  transition: border-color .2s, transform .2s;
}
.card:hover { border-color: var(--red); transform: translateY(-3px); }
.card h3 { margin: 0 0 8px; color: var(--red); }
.tag {
  display: inline-block;
  font-size: 0.7rem;
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-right: 6px;
  color: #999;
}
.card a.btn {
  display: inline-block;
  margin-top: 12px;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--red);
  color: var(--red);
  text-decoration: none;
  border-radius: 4px;
}
.card a.btn:hover { background: var(--red); color: #000; }
input, textarea, button, select {
  background: #000;
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 8px 10px;
  font-family: inherit;
  border-radius: 4px;
  width: 100%;
  margin-bottom: 10px;
}
button, input[type=submit] {
  width: auto;
  cursor: pointer;
  border-color: var(--red);
  color: var(--red);
}
button:hover, input[type=submit]:hover { background: var(--red); color: #000; }
.flag-box {
  background: #051505;
  border: 1px solid var(--green);
  color: var(--green);
  padding: 12px;
  border-radius: 6px;
  margin: 16px 0;
  font-weight: bold;
  word-break: break-all;
}
.hint {
  border-left: 3px solid #444;
  padding-left: 12px;
  color: #999;
  font-size: 0.9rem;
  margin: 16px 0;
}
.error { color: var(--red); }
pre { background: #000; padding: 12px; border-radius: 6px; overflow-x: auto; border: 1px solid var(--border); }
footer { text-align: center; padding: 24px; color: #555; font-size: 0.8rem; border-top: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; margin: 12px 0; }
th, td { border: 1px solid var(--border); padding: 8px; text-align: left; }