:root {
  --bg: #0f1420;
  --panel: #171e2e;
  --border: #283149;
  --text: #e3e8f2;
  --muted: #8a94ab;
  --accent: #4fa3ff;
  --ok: #3ccf8e;
  --err: #ff6b6b;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.5; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
main { max-width: 960px; margin: 0 auto; padding: 24px 16px 64px; }
h1 { margin-top: 0; }

.topbar {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between;
  padding: 12px 16px; background: var(--panel); border-bottom: 1px solid var(--border);
}
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); font-size: 1.1rem; }
.brand:hover { text-decoration: none; }
.brand-icon { width: 22px; height: 22px; color: var(--accent); flex: none; }
.topbar nav { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
.who { color: var(--muted); }
.inline { display: inline; margin: 0; }

button, .button {
  font: inherit; cursor: pointer; border: 0; border-radius: 6px;
  padding: 8px 14px; background: var(--accent); color: #06111f; font-weight: 600;
}
.button:hover { text-decoration: none; filter: brightness(1.1); }
button.link { background: none; color: var(--accent); padding: 0; font-weight: 400; }

input {
  font: inherit; width: 100%; padding: 8px 10px; margin-top: 4px;
  background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 6px;
}
input:focus { outline: 2px solid var(--accent); border-color: transparent; }
label { display: block; margin-bottom: 14px; }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 20px; margin-bottom: 20px; }
.narrow { max-width: 400px; margin: 40px auto; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.ok { color: var(--ok); }

.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; border: 1px solid var(--border); }
.flash-success { border-color: var(--ok); color: var(--ok); }
.flash-error { border-color: var(--err); color: var(--err); }

.category { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.9rem; color: var(--muted); margin-top: 32px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; }
.tile {
  display: flex; flex-direction: column; gap: 4px; padding: 16px;
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px; color: var(--text);
}
.tile:hover { border-color: var(--accent); text-decoration: none; }
.tile.solved { border-color: var(--ok); opacity: 0.75; }
.tile .points { font-size: 1.6rem; font-weight: 700; color: var(--accent); }
.tile.solved .points { color: var(--ok); }
.tile .title { font-weight: 600; }

.meta { display: flex; gap: 10px; align-items: center; margin-bottom: 8px; }
.tag { background: var(--bg); border: 1px solid var(--border); border-radius: 99px; padding: 2px 10px; font-size: 0.8rem; text-transform: uppercase; }
.meta .points { color: var(--accent); font-weight: 600; }
.description { white-space: pre-wrap; margin-bottom: 16px; }
.flag-form { display: flex; gap: 8px; }
.flag-form input { margin-top: 0; font-family: ui-monospace, monospace; }

.scoreboard { width: 100%; border-collapse: collapse; }
.scoreboard th, .scoreboard td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
.scoreboard .num { text-align: right; }
.scoreboard tr.me { background: rgba(79, 163, 255, 0.1); }
.solvers { padding-left: 20px; }

.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Admin */
.subnav { display: flex; gap: 16px; margin-bottom: 20px; border-bottom: 1px solid var(--border); }
.subnav a { padding: 6px 2px; color: var(--muted); }
.subnav a.active { color: var(--text); border-bottom: 2px solid var(--accent); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }
.stat { display: flex; flex-direction: column; }
.stat .big { font-size: 2rem; font-weight: 700; }
.table-wrap { overflow-x: auto; }
.data { width: 100%; border-collapse: collapse; }
.data th, .data td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.data .num { text-align: right; }
.search { display: flex; gap: 8px; margin-bottom: 8px; }
.search input { margin-top: 0; }
.seat-form { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.seat-form label { margin-bottom: 0; width: 100px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.actions h2 { width: 100%; margin: 0 0 4px; }
.actions form { margin: 0; }
button.secondary { background: var(--border); color: var(--text); }
button.danger { background: var(--err); color: #1a0505; }
button.link.danger { background: none; color: var(--err); }
code { font-family: ui-monospace, monospace; font-size: 0.9em; }