:root {
  --bg: #0b1220;
  --panel: #111b2e;
  --panel-2: #16233a;
  --text: #e7edf6;
  --muted: #9fb0cc;
  --accent: #46d1a2;
  --danger: #ff6b6b;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  background: radial-gradient(circle at 20% 0%, #1c2a45, var(--bg) 55%);
  color: var(--text);
  min-height: 100vh;
}

.wrap {
  width: min(1000px, 100%);
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid rgba(143, 170, 214, 0.22);
  border-radius: 14px;
  padding: 16px;
}

h1, h2, h3 { margin: 0 0 12px; }
p { margin: 0 0 10px; color: var(--muted); }
a { color: #90d4ff; text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.btn, button {
  border: 1px solid rgba(143, 170, 214, 0.34);
  background: var(--panel);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 14px;
  cursor: pointer;
}

.btn:hover, button:hover { background: var(--panel-2); }
.btn.primary, button.primary {
  background: #1d6f56;
  border-color: #2ea47f;
}

.row { display: flex; gap: 12px; flex-wrap: wrap; }
.col { flex: 1 1 280px; }

input, select {
  width: 100%;
  padding: 9px 10px;
  border-radius: 9px;
  border: 1px solid rgba(143, 170, 214, 0.28);
  background: #0d1729;
  color: var(--text);
  margin-bottom: 10px;
}

.status {
  font-size: 14px;
  color: var(--muted);
}

.status.error { color: var(--danger); }
.status.ok { color: #81f5cf; }

table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  padding: 9px 8px;
  border-bottom: 1px solid rgba(143, 170, 214, 0.18);
  text-align: left;
}

#board2048 {
  width: 300px;
  height: 300px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 8px;
  margin-top: 10px;
}

.tile {
  border-radius: 10px;
  background: #23314d;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

#tetrisCanvas {
  background: #05080f;
  border: 1px solid rgba(143, 170, 214, 0.32);
}

.reaction-box {
  width: min(500px, 100%);
  height: 220px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: #8e2b2b;
  user-select: none;
  cursor: pointer;
  font-size: 22px;
  font-weight: 600;
}

.reaction-box.ready { background: #277747; }