:root {
  --bg: #10131a;
  --panel: #1a1f2b;
  --panel-2: #222838;
  --ink: #e6e9ef;
  --muted: #97a0b3;
  --accent: #f5c542;
  --tile: #f7e9c6;
  --tile-ink: #3a2f10;
  --good: #46c06a;
  --bad: #e5544b;
  --line: #2c3345;
  --tile-size: 34px;
  --tile-font: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

/* ===== Auth gate ===== */
.auth {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(circle at 50% 30%, #182033, var(--bg));
  padding: 20px;
}
.auth-card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 28px; max-width: 420px; width: 100%;
  text-align: center;
}
.auth-card h1 { margin: 0 0 6px; font-size: 26px; }
.auth-sub { color: var(--muted); font-size: 14px; margin: 0 0 20px; }
#auth-form { display: flex; gap: 8px; }
#auth-key {
  flex: 1; background: var(--panel-2); color: var(--ink);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; font-size: 14px;
}
.auth-error { color: var(--bad); font-size: 13px; margin: 12px 0 0; }
.auth-note { color: var(--muted); font-size: 12px; margin: 18px 0 0; line-height: 1.5; }
.auth-note code { background: var(--panel-2); padding: 1px 5px; border-radius: 4px; }

/* ===== Topbar ===== */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; background: var(--panel); border-bottom: 1px solid var(--line);
}
.topbar h1 { font-size: 18px; margin: 0; font-weight: 700; }
.who { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.me { color: var(--accent); font-weight: 600; }
.conn { color: var(--muted); font-size: 20px; line-height: 1; }
.conn.live { color: var(--good); }

main { padding: 16px 20px; max-width: 1200px; margin: 0 auto; }

.controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.controls .sep { width: 1px; height: 22px; background: var(--line); margin: 0 4px; }
.controls .status { color: var(--muted); font-size: 13px; margin-left: auto; }

button {
  background: var(--panel-2); color: var(--ink);
  border: 1px solid var(--line); border-radius: 6px;
  padding: 7px 12px; font-size: 13px; cursor: pointer;
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: #241f06; border-color: var(--accent); font-weight: 600; }
button.danger:hover { border-color: var(--bad); color: var(--bad); }
button:disabled { opacity: 0.45; cursor: not-allowed; }
button.mini { padding: 2px 8px; font-size: 12px; }

.layout { display: grid; grid-template-columns: 1fr 340px; gap: 16px; }
@media (max-width: 900px) { .layout { grid-template-columns: 1fr; } }

.board-meta { display: flex; gap: 16px; font-size: 13px; color: var(--muted); margin-bottom: 8px; align-items: center; }
.board-meta b { color: var(--ink); }
.board-meta .zoom { margin-left: auto; display: inline-flex; gap: 4px; }
.board-meta .zoom button { padding: 2px 8px; font-size: 12px; line-height: 1.4; min-width: 34px; }

.board {
  display: grid; gap: 2px; background: var(--line);
  border: 1px solid var(--line); padding: 2px; border-radius: 6px;
  overflow: auto; max-height: 60vh;
}
.cell {
  width: var(--tile-size); height: var(--tile-size);
  background: var(--panel);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: var(--tile-font);
  cursor: pointer; user-select: none; border-radius: 3px;
}
.cell.empty:hover { background: var(--panel-2); }
.cell.filled { background: var(--tile); color: var(--tile-ink); }
/* Invalid-word highlight: cells belonging to a garbage word turn red. */
.cell.invalid { background: var(--bad); color: #fff; }

.rack-wrap { margin-top: 14px; }
.rack-label { font-size: 13px; color: var(--muted); margin-bottom: 6px; display: flex; align-items: center; gap: 10px; }
.rack { display: flex; flex-wrap: wrap; gap: 6px; min-height: 42px; }
.rtile {
  width: var(--tile-size); height: var(--tile-size);
  background: var(--tile); color: var(--tile-ink);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: var(--tile-font);
  border-radius: 4px; cursor: pointer; border: 2px solid transparent;
}
.rtile.selected { border-color: var(--accent); transform: translateY(-2px); }

.hint { color: var(--muted); font-size: 12px; margin-top: 10px; }

.validation { margin-top: 12px; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); font-size: 13px; }
.validation.ok { border-color: var(--good); }
.validation.bad { border-color: var(--bad); }
.validation .v-head { font-weight: 600; margin-bottom: 6px; }
.validation .v-bad { color: var(--bad); }
.validation .v-good { color: var(--good); }
.validation ul { margin: 6px 0 0; padding-left: 18px; }

.side { display: flex; flex-direction: column; gap: 16px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 12px; }
.panel h2 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); margin: 0 0 10px; }

.prop { border: 1px solid var(--line); border-radius: 6px; padding: 8px; margin-bottom: 8px; font-size: 13px; }
.prop .who { font-weight: 600; }
.prop .badge { font-size: 11px; padding: 1px 7px; border-radius: 999px; }
.prop .badge.ok { background: rgba(70,192,106,0.2); color: var(--good); }
.prop .badge.no { background: rgba(229,84,75,0.2); color: var(--bad); }
.prop .errs { color: var(--bad); font-size: 12px; margin: 6px 0 0; }
.prop .words { color: var(--muted); font-size: 12px; margin-top: 4px; }
.prop button { margin-top: 8px; margin-right: 6px; }

.chat { height: 220px; overflow-y: auto; display: flex; flex-direction: column; gap: 6px; font-size: 13px; }
.chat .msg .a { color: var(--accent); font-weight: 600; }
.chat-form { display: flex; gap: 6px; margin-top: 8px; }
.chat-form input {
  flex: 1; background: var(--panel-2); color: var(--ink);
  border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px;
}

.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: var(--panel-2); color: var(--ink);
  border: 1px solid var(--line); border-left: 3px solid var(--accent);
  padding: 10px 16px; border-radius: 6px; font-size: 13px;
  opacity: 0; pointer-events: none; transition: opacity 0.2s; max-width: 80vw; z-index: 10;
}
.toast.show { opacity: 1; }
.toast.error { border-left-color: var(--bad); }