/* 记忆回溯 · N-Back 专属样式（选择器统一 .g-nback 前缀） */

.g-nback {
  --nb-cell-gap: 8px;
}

/* ---------- 顶部 / 视图容器 ---------- */
.g-nback .g-title { font-size: 13px; }
.g-nback .nb-setup-view,
.g-nback .nb-play,
.g-nback .nb-result {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}
.g-nback .nb-play { flex: 1; gap: 10px; position: relative; }
.g-nback .nb-result { flex: 1; }

/* ---------- 设置区 ---------- */
.g-nback .panel-h { margin-bottom: 9px; }
.g-nback .nb-label {
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--faint);
  margin-bottom: 7px;
}
.g-nback .nb-best { padding: 11px 13px 12px; }
.g-nback .nb-best-head {
  font-size: 10.5px;
  color: var(--faint);
  letter-spacing: 0.03em;
  margin-bottom: 8px;
  text-align: center;
}
.g-nback .nb-best .stat { padding: 7px 6px; }
.g-nback .nb-best .stat-v { font-size: 15px; }

.g-nback .nb-rules { padding: 12px 13px; }
.g-nback .nb-rule-line {
  font-size: 12px;
  line-height: 1.75;
  color: var(--dim);
}
.g-nback .nb-rule-line b { color: var(--text); font-weight: 600; }
.g-nback .nb-em { color: var(--accent); }

/* ---------- 游戏区 ---------- */
.g-nback .nb-play-head {
  font-size: 12px;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}
.g-nback .nb-live { font-size: 12px; color: var(--faint); font-variant-numeric: tabular-nums; }
.g-nback .nb-live .nb-ok { color: var(--ok); }
.g-nback .nb-live .nb-bad { color: var(--err); }
.g-nback .nb-progress { flex: none; height: 5px; }
.g-nback .nb-board-wrap {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.g-nback .nb-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: var(--nb-cell-gap);
  width: min(100%, 348px);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  padding: var(--nb-cell-gap);
  border-radius: 24px;
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 100% at 50% -10%, rgba(183, 140, 255, 0.14), transparent 62%),
    rgba(255, 255, 255, 0.03);
  flex: none;
}

.g-nback .nb-cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(255, 255, 255, 0.045);
  overflow: hidden;
  transition: background 0.16s ease, transform 0.16s ease, box-shadow 0.2s ease, border-color 0.16s ease;
}
.g-nback .nb-cell::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.07), transparent 55%);
  pointer-events: none;
}
.g-nback .nb-cell.on {
  background: linear-gradient(150deg, var(--accent), var(--accent2));
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow: 0 10px 34px -12px var(--accent), inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transform: scale(1.015);
}
.g-nback .nb-letter {
  position: relative;
  font-size: clamp(30px, 10vw, 46px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.01em;
  color: #fff;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.28);
  opacity: 0;
}
.g-nback .nb-cell.on .nb-letter { opacity: 1; animation: nbLetterPop 0.2s cubic-bezier(0.2, 0.9, 0.3, 1.4) both; }
.g-nback .nb-cell.on.no-letter::after {
  content: "";
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 22px 6px rgba(255, 255, 255, 0.45);
  animation: nbDotPop 0.22s cubic-bezier(0.2, 0.9, 0.3, 1.4) both;
}

@keyframes nbLetterPop {
  from { transform: scale(0.55); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
@keyframes nbDotPop {
  from { transform: scale(0.3); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.g-nback .nb-msg {
  min-height: 20px;
  text-align: center;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: transparent;
  transition: color 0.15s;
}
.g-nback .nb-msg.ok { color: var(--ok); }
.g-nback .nb-msg.err { color: var(--err); }

/* ---------- 大按钮（拇指友好，≥64px 高） ---------- */
.g-nback .nb-keys {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: auto;
  padding-top: 4px;
  flex: none;
}
.g-nback .nb-keys.single { grid-template-columns: 1fr; }
.g-nback .nb-key {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: 70px;
  padding: 10px 8px;
  border-radius: 17px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--text);
  touch-action: manipulation;
  transition: transform 0.1s ease, background 0.16s ease, border-color 0.16s ease, opacity 0.16s;
}
.g-nback .nb-key.letter {
  border-color: color-mix(in srgb, var(--accent) 34%, transparent);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface-2));
}
.g-nback .nb-key.position {
  border-color: rgba(95, 224, 200, 0.3);
  background: rgba(95, 224, 200, 0.08);
}
.g-nback .nb-key:active { transform: scale(0.97); }
.g-nback .nb-key[disabled] { opacity: 0.38; }
.g-nback .nb-key.ok {
  background: rgba(62, 207, 142, 0.16);
  border-color: rgba(62, 207, 142, 0.5);
}
.g-nback .nb-key.err {
  background: rgba(255, 92, 108, 0.14);
  border-color: rgba(255, 92, 108, 0.52);
}
.g-nback .nb-key-t {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.g-nback .nb-key-s {
  font-size: 10.5px;
  color: var(--faint);
  font-weight: 500;
}
.g-nback .nb-key.ok .nb-key-t { color: #7bf0bd; }
.g-nback .nb-key.err .nb-key-t { color: #ff9aaa; }

/* ---------- 暂停遮罩 ---------- */
.g-nback .nb-paused {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: none;
  align-items: center;
  justify-content: center;
  border-radius: 18px;
  background: rgba(8, 11, 18, 0.66);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  text-align: center;
  padding: 20px;
}
.g-nback .nb-paused.show { display: flex; }
.g-nback .nb-paused-t { font-size: 15px; font-weight: 700; margin-bottom: 4px; }

/* ---------- 结算 ---------- */
.g-nback .nb-result-head { text-align: center; padding: 4px 0 0; }
.g-nback .nb-result-big {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  background: linear-gradient(120deg, var(--accent), #5fe0c8);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.g-nback .nb-result-sub {
  font-size: 11.5px;
  color: var(--faint);
  margin-top: 3px;
  font-variant-numeric: tabular-nums;
}
.g-nback .nb-result-best {
  margin-top: 12px;
  text-align: center;
  font-size: 11.5px;
  color: var(--dim);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
}
.g-nback .nb-result-best .badge { font-size: 10.5px; }

@media (max-width: 359px) {
  .g-nback .nb-grid { width: 100%; }
  .g-nback .nb-key { min-height: 64px; }
  .g-nback .nb-key-t { font-size: 15px; }
}