* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f0f1e;
  --panel: #1a1a33;
  --panel-2: #232346;
  --accent: #7c5cff;
  --accent-2: #00d4ff;
  --text: #e8e8f0;
  --muted: #8a8aa5;
  --danger: #ff5c7a;
}

html, body {
  height: 100%;
}

body {
  background: radial-gradient(1200px 600px at 50% -10%, #1e1e45 0%, var(--bg) 60%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow: hidden;
}

#app { width: 100%; display: flex; justify-content: center; }

.hidden { display: none !important; }

/* ---------- screens ---------- */
.screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 24px;
  width: 100%;
  max-width: 520px;
  animation: fade-in .25s ease;
}

@keyframes fade-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

h1 {
  font-size: 42px;
  letter-spacing: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-align: center;
}

.subtitle { color: var(--muted); letter-spacing: 8px; text-transform: uppercase; font-size: 13px; }

form {
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 380px;
  margin-top: 8px;
}

input[type="text"] {
  flex: 1;
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid #33335c;
  background: var(--panel);
  color: var(--text);
  font-size: 16px;
  outline: none;
  transition: border-color .15s;
}

input[type="text"]:focus { border-color: var(--accent); }

button {
  padding: 13px 22px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .1s, filter .15s;
}

button:hover { filter: brightness(1.12); }
button:active { transform: scale(.97); }

.btn-ghost {
  background: transparent;
  border: 1px solid #3a3a66;
  color: var(--muted);
  font-weight: 500;
}
.btn-ghost:hover { color: var(--text); border-color: #55558a; filter: none; }

/* ---------- leaderboard ---------- */
.leaderboard {
  width: 100%;
  max-width: 380px;
  background: var(--panel);
  border: 1px solid #2c2c55;
  border-radius: 14px;
  padding: 14px 18px;
}

.leaderboard h3 { font-size: 14px; color: var(--muted); letter-spacing: 2px; margin-bottom: 10px; }

.leaderboard .row {
  display: grid;
  grid-template-columns: 28px 1fr 70px 40px;
  gap: 8px;
  padding: 7px 4px;
  font-size: 15px;
  border-bottom: 1px solid #252550;
  align-items: center;
}

.leaderboard .row:last-child { border-bottom: none; }
.leaderboard .row .rank { color: var(--muted); font-weight: 600; }
.leaderboard .row.top-1 .rank { color: #ffd24a; }
.leaderboard .row.top-2 .rank { color: #c8ccd8; }
.leaderboard .row.top-3 .rank { color: #e8a15c; }
.leaderboard .row .score { text-align: right; font-weight: 700; }
.leaderboard .row .lines { text-align: right; color: var(--muted); }
.leaderboard .empty { color: var(--muted); text-align: center; padding: 14px 0; font-size: 14px; }

/* ---------- game screen ---------- */
#game-wrap {
  display: flex;
  gap: 18px;
  align-items: center;
  justify-content: center;
}

.panel { display: flex; flex-direction: column; gap: 14px; width: 150px; }

.panel-box {
  background: var(--panel);
  border: 1px solid #2c2c55;
  border-radius: 14px;
  padding: 12px;
}

.panel-box h3 { font-size: 12px; color: var(--muted); letter-spacing: 2px; margin-bottom: 8px; }

#next-canvas { display: block; margin: 0 auto; background: #12122a; border-radius: 10px; }

.stats .stat {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 5px 0;
}
.stats .stat span { color: var(--muted); font-size: 13px; }
.stats .stat b { font-size: 20px; color: var(--text); }

.player-name { font-size: 17px; font-weight: 700; text-align: center; word-break: break-all; }

.controls-help p { font-size: 13px; color: var(--muted); padding: 3px 0; }
.controls-help kbd {
  display: inline-block;
  min-width: 20px;
  text-align: center;
  background: var(--panel-2);
  border: 1px solid #3a3a66;
  border-radius: 5px;
  padding: 1px 5px;
  margin-right: 4px;
  font-size: 11px;
  color: var(--text);
}

#board-wrap { position: relative; }

#board-canvas {
  background: #12122a;
  border: 2px solid #2c2c55;
  border-radius: 10px;
  box-shadow: 0 20px 60px rgba(0,0,0,.45);
}

/* ---------- game over ---------- */
.final-name { font-size: 20px; color: var(--accent-2); font-weight: 700; }

.final-score {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 17px;
  background: var(--panel);
  border: 1px solid #2c2c55;
  border-radius: 14px;
  padding: 16px 26px;
}
.final-score span { color: var(--muted); font-size: 14px; }
.final-score b { font-size: 26px; }
.final-score .sep { color: #3a3a66; }

.rank-badge {
  font-size: 15px;
  font-weight: 700;
  color: #ffd24a;
  padding: 6px 16px;
  border: 1px solid #66551f;
  border-radius: 999px;
  background: rgba(255, 210, 74, .08);
}

.final-actions { display: flex; gap: 12px; }

/* ---------- pause overlay ---------- */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 8, 20, .75);
  backdrop-filter: blur(3px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  z-index: 50;
}
.overlay h2 { font-size: 34px; letter-spacing: 6px; }
.overlay p { color: var(--muted); }

@media (max-width: 720px) {
  #game-wrap { flex-direction: column; gap: 10px; }
  .panel { flex-direction: row; width: auto; flex-wrap: wrap; justify-content: center; }
  .panel-box { min-width: 130px; }
  .controls-help { display: none; }
}