:root {
  --bg: #f3f7fb; --panel: #fff; --line: #dce6ef; --text: #3e4c5e; --strong: #1a2b3c;
  --muted: #7b8a9b; --blue: #2b8cee; --r: 12px; --shadow: 0 10px 28px rgba(26,43,60,.06);
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: Inter, "Noto Sans SC", sans-serif;
  background: radial-gradient(900px 380px at 8% -10%, rgba(43,140,238,.10), transparent 52%), var(--bg);
  color: var(--text);
}
a { color: inherit; text-decoration: none; }
h1 { margin: 0 0 8px; font-size: 28px; color: var(--strong); }
h2 { margin: 0 0 12px; font-size: 16px; color: var(--strong); }
h3 { margin: 0 0 8px; font-size: 13px; }
.muted, .lead { color: var(--muted); }
.top {
  display: flex; align-items: center; gap: 16px; padding: 10px 18px;
  background: rgba(255,255,255,.9); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 9;
}
.brand { display: flex; gap: 8px; align-items: center; }
.logo { width: 28px; height: 28px; border-radius: 8px; display: grid; place-items: center; color: #fff; font-weight: 800; }
.brand em { display: block; font-style: normal; color: var(--muted); font-size: 12px; }
.jump { display: flex; gap: 10px; font-size: 13px; }
.jump a { padding: 6px 8px; border-radius: 8px; }
.jump a:hover { background: #e8f1f8; }
.who { margin-left: auto; display: flex; gap: 8px; align-items: center; font-size: 13px; }
.main { padding: 20px; max-width: 1180px; margin: 0 auto; }
.card, .hero, .mini, .col {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow);
}
.card { padding: 18px; margin: 16px 0; }
.hero { padding: 22px; display: flex; justify-content: space-between; gap: 16px; align-items: center; border-top: 4px solid var(--c, var(--blue)); }
.pill { display: inline-block; padding: 4px 10px; background: #e8f1f8; border-radius: 999px; font-size: 12px; }
.btn, button.btn {
  background: var(--blue); color: #fff; border: 0; border-radius: 8px; padding: 8px 14px; font-weight: 600; cursor: pointer;
}
.btn.sm { padding: 6px 10px; font-size: 12px; }
.ghost { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; cursor: pointer; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.list { list-style: none; padding: 0; margin: 0; }
.list li { display: flex; justify-content: space-between; gap: 8px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line); }
.list span, .mini span { display: block; color: var(--muted); font-size: 12px; }
.steps { line-height: 1.9; }
code { background: #eef4fa; padding: 1px 6px; border-radius: 4px; }
.gate { min-height: 70vh; display: grid; place-items: center; }
.login { width: min(440px, 92vw); padding: 24px; }
.login label, .form label, .ai label { display: block; margin: 10px 0; font-size: 13px; }
input, textarea, select {
  width: 100%; margin-top: 4px; padding: 8px; border: 1px solid #c9d6e4; border-radius: 8px; font: inherit;
}
textarea { min-height: 72px; }
.alert { background: #ffe8e8; color: #b42318; padding: 8px 10px; border-radius: 8px; }
.hint { margin-top: 16px; font-size: 12px; color: var(--muted); line-height: 1.6; }
.kanban { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.col { padding: 10px; min-height: 180px; }
.mini { padding: 10px; margin: 8px 0; }
.stats { display: flex; gap: 18px; }
.stats b { display: block; font-size: 28px; color: var(--strong); }
.fb { display: grid; grid-template-columns: 1.4fr 72px 90px 1fr auto; gap: 8px; align-items: center; margin: 8px 0; }
.row { display: flex; gap: 8px; align-items: center; }
.room { display: grid; grid-template-columns: 280px 1fr; gap: 16px; min-height: 70vh; }
.stage video, .ai video { width: 100%; border-radius: 12px; background: #111; }
.remotes { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 8px; }
.chat { height: 220px; overflow: auto; border: 1px solid var(--line); border-radius: 8px; padding: 8px; margin: 12px 0; background: #f8fbfe; font-size: 13px; }
.code-wrap { display: grid; grid-template-rows: auto 1fr 160px; min-height: 78vh; gap: 8px; }
.code-bar { display: flex; justify-content: space-between; align-items: center; }
#editor, #out { width: 100%; border: 1px solid var(--line); border-radius: 8px; padding: 10px; font-family: ui-monospace, monospace; }
#editor { min-height: 360px; }
#out { background: #0f1720; color: #d1fae5; margin: 0; overflow: auto; }
.score b { font-size: 42px; color: var(--blue); }
.answers { white-space: pre-wrap; background: #f6fafd; padding: 12px; border-radius: 8px; }
.create { display: flex; gap: 8px; min-width: 280px; }
@media (max-width: 900px) {
  .grid2, .kanban, .room, .fb, .hero { grid-template-columns: 1fr; display: grid; }
  .jump { display: none; }
}