[hidden] { display: none !important; }
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.45 system-ui, sans-serif; background: #15171c; color: #e6e6e6; }
header { display: flex; gap: 16px; align-items: center; padding: 10px 18px; background: #1d2027; border-bottom: 1px solid #2c303a; position: sticky; top: 0; }
header nav { display: flex; gap: 6px; }
#user-box { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.logo { color: #ffcf5c; }
main { max-width: 920px; margin: 0 auto; padding: 18px; }
a { color: #7fb4ff; }
button, select, input, textarea { font: inherit; color: inherit; background: #262a33; border: 1px solid #3a3f4b; border-radius: 6px; padding: 6px 10px; }
button { cursor: pointer; }
button:hover { background: #303542; }
button.primary { background: #2f6fde; border-color: #2f6fde; }
button.danger { border-color: #a14040; }
button.chip { border-radius: 16px; }
button.active, button.chip.on { background: #ffcf5c; color: #111; border-color: #ffcf5c; }
textarea { width: 100%; min-height: 70px; }
input[type=text] { width: 100%; }
h1, h2, h3 { margin: 10px 0; }
#banner { background: #5a2a2a; padding: 8px 18px; white-space: pre-wrap; }
#banner.ok { background: #24502e; }
.card { background: #1d2027; border: 1px solid #2c303a; border-radius: 10px; padding: 14px; margin: 10px 0; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.grow { flex: 1; }
.muted { color: #8a90a0; }
.small { font-size: 13px; }
.badge { font-size: 12px; padding: 2px 8px; border-radius: 10px; background: #333846; }
.badge.ok { background: #24502e; } .badge.warn { background: #5a4a1a; } .badge.bad { background: #5a2a2a; }
.stars { color: #ffcf5c; letter-spacing: 2px; }
.lesson { cursor: pointer; }
.lesson.locked { opacity: .55; }
.prompt { font-size: 20px; white-space: pre-wrap; margin: 6px 0 12px; }
.field { margin: 10px 0; }
.field label { display: block; margin-bottom: 4px; }
.field .err { color: #ff8a8a; font-size: 13px; }
.words span { display: inline-block; padding: 2px 4px; margin: 2px; border-radius: 4px; cursor: pointer; background: #262a33; }
.words span.before { background: #2c3b55; } .words span.after { background: #5a3a2a; }
.words span.sel { outline: 2px solid #ffcf5c; }
.progressbar { height: 8px; background: #2c303a; border-radius: 4px; overflow: hidden; }
.progressbar > div { height: 100%; background: #4caf6a; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
td, th { border-bottom: 1px solid #2c303a; padding: 4px 6px; text-align: left; vertical-align: top; }
.payload { font-family: ui-monospace, monospace; font-size: 12px; color: #b9c0cf; white-space: pre-wrap; }
.timer { font-size: 28px; font-variant-numeric: tabular-nums; }
.dev { border-color: #8a6d1a; }
#auth-gate { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center; background: #15171c; z-index: 100; }
#auth-gate[hidden] { display: none !important; }
#auth-form { width: 300px; background: #1d2027; border: 1px solid #2c303a; border-radius: 10px; padding: 22px; }
#auth-form h2 { margin-top: 0; }
#auth-form input { width: 100%; margin: 8px 0; }
#auth-form button { width: 100%; background: #2f6fde; border-color: #2f6fde; }
#auth-error { color: #ff8a8a; font-size: 13px; margin: 8px 0 0; }