:root {
  --bg: #0f1220;
  --panel: #191d31;
  --panel2: #21263f;
  --ink: #eef1fa;
  --muted: #9aa3c0;
  --accent: #6ea8fe;
  --accent2: #7ee0b8;
  --warn: #ffb454;
  --danger: #ff6b6b;
  --line: #2c3252;
  --radius: 12px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(180deg, #0d1020, #12162a 40%, #0d1020);
  color: var(--ink);
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .8rem 1.2rem; background: rgba(10,12,24,.85);
  border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(6px);
}
.brand a { font-weight: 700; font-size: 1.1rem; color: var(--ink); }
nav { display: flex; gap: .3rem; flex-wrap: wrap; }
nav a { padding: .35rem .7rem; border-radius: 8px; color: var(--muted); }
nav a.active, nav a:hover { background: var(--panel2); color: var(--ink); text-decoration: none; }

main { max-width: 980px; margin: 1.4rem auto; padding: 0 1rem; }
h1 { font-size: 1.7rem; margin: .2rem 0 .8rem; }
h2 { font-size: 1.25rem; margin: 1.2rem 0 .6rem; }
h3 { font-size: 1.02rem; margin: 1rem 0 .4rem; color: var(--accent2); }

.panel, .hero, .rules {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.1rem 1.2rem; margin-bottom: 1.1rem;
}
.hero .lede { color: var(--muted); font-size: 1.05rem; max-width: 60ch; }
.muted { color: var(--muted); }
.row { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; margin: .6rem 0; }
.grid2 { display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 800px) { .grid2 { grid-template-columns: 1.4fr 1fr; } }

input, select, button {
  font: inherit; padding: .5rem .7rem; border-radius: 8px;
  border: 1px solid var(--line); background: var(--panel2); color: var(--ink);
}
input:focus, select:focus { outline: 2px solid var(--accent); }
.btn {
  background: var(--accent); color: #0a0e1c; border: none; font-weight: 600;
  cursor: pointer; padding: .5rem .9rem;
}
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn.warn { background: var(--warn); }
.btn.danger { background: var(--danger); color: #fff; }

.pill {
  display: inline-block; padding: .05rem .55rem; border-radius: 999px;
  background: var(--panel2); border: 1px solid var(--line); font-size: .85rem;
}
.pill.live { background: rgba(126,224,184,.15); color: var(--accent2); border-color: var(--accent2); }
.pill.ok { color: var(--accent2); } .pill.bad { color: var(--danger); }

table { width: 100%; border-collapse: collapse; margin: .4rem 0; }
th, td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: .9rem; }
table.mini th, table.mini td { padding: .3rem .4rem; font-size: .9rem; }
tr.you { background: rgba(110,168,254,.12); }
.rank1 td:first-child { color: gold; font-weight: 700; }

.exlist .ex {
  border: 1px solid var(--line); border-radius: 10px; padding: .7rem .9rem;
  margin-bottom: .6rem; background: var(--panel2);
}
.exlist .ex label { display: flex; gap: .6rem; align-items: baseline; cursor: pointer; }
.exlist .ex .en { color: var(--muted); font-size: .92rem; margin-top: .3rem; }
.exlist .ex .meta { font-size: .8rem; color: var(--muted); }

.tags { list-style: none; padding: 0; display: flex; gap: .4rem; flex-wrap: wrap; }
.tags li { background: var(--panel2); border: 1px solid var(--line); border-radius: 999px; padding: .15rem .6rem; font-size: .85rem; }
.token-once {
  background: #14251c; border: 1px dashed var(--accent2); color: var(--accent2);
  padding: .6rem .8rem; border-radius: 8px; font-family: ui-monospace, monospace; word-break: break-all;
}
.result { background: #0b0e1a; border: 1px solid var(--line); border-radius: 8px; padding: .7rem; white-space: pre-wrap; }
.feed { list-style: none; padding: 0; max-height: 60vh; overflow: auto; }
.feed li { padding: .35rem .5rem; border-bottom: 1px solid var(--line); font-size: .92rem; }
.feed li .t { color: var(--muted); font-variant-numeric: tabular-nums; }
.feed li.win { color: var(--accent2); }
footer { max-width: 980px; margin: 2rem auto; padding: 0 1rem 2rem; color: var(--muted); font-size: .85rem; }
hr { border: none; border-top: 1px solid var(--line); margin: 1rem 0; }
.err { color: var(--danger); } .ok { color: var(--accent2); }

/* Énoncé complet dépliable dans la liste d'exercices */
.exlist .ex details.enonce { margin-top: .5rem; }
.exlist .ex details.enonce > summary {
  cursor: pointer; color: var(--accent); font-size: .92rem; padding: .2rem 0;
  user-select: none;
}
.exlist .ex details.enonce > summary:hover { filter: brightness(1.1); }
.enonce-md {
  margin-top: .6rem; padding: .8rem 1rem; background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; font-size: .95rem;
  overflow-x: auto;
}
.enonce-md h1 { font-size: 1.25rem; }
.enonce-md h2 { font-size: 1.1rem; }
.enonce-md h3 { font-size: 1rem; }
.enonce-md p { margin: .5rem 0; }
.enonce-md ul, .enonce-md ol { margin: .5rem 0; padding-left: 1.4rem; }
.enonce-md li { margin: .2rem 0; }
.enonce-md code {
  background: var(--panel2); padding: .1rem .35rem; border-radius: 5px;
  font-family: ui-monospace, monospace; font-size: .88em;
}
.enonce-md pre {
  background: #0b0e1a; border: 1px solid var(--line); border-radius: 8px;
  padding: .7rem .9rem; overflow-x: auto;
}
.enonce-md pre code { background: none; padding: 0; }
.enonce-md table { width: auto; margin: .6rem 0; border-collapse: collapse; }
.enonce-md th, .enonce-md td { border: 1px solid var(--line); padding: .35rem .6rem; font-size: .9rem; }
.enonce-md blockquote {
  margin: .6rem 0; padding: .3rem .9rem; border-left: 3px solid var(--accent);
  color: var(--muted);
}
.files h4 { margin: .8rem 0 .3rem; font-size: .92rem; color: var(--accent2); }
.files-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: .3rem .8rem; }
.files-list li { font-size: .85rem; font-family: ui-monospace, monospace; }