/* ==============================================================
   速算泡泡 · 游戏专属样式
   选择器统一以 .g-mathblitz / .mb-* 前缀限定
   ============================================================== */

.g-mathblitz { gap: 10px; }

/* ------------------------------ 顶部状态 ------------------------------ */

.mb-hud {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 30px;
}
.mb-hud .badge { font-size: 11px; padding: 4px 10px; }
.mb-score {
  font-size: 12.5px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.mb-combo {
  font-size: 11.5px;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  min-width: 42px;
  opacity: 0;
  transform: translateY(2px);
  transition: opacity 0.15s, transform 0.15s;
}
.mb-combo.on { opacity: 1; transform: none; }
.mb-time {
  margin-left: auto;
  font-size: 18px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}
.mb-progress { flex: none; height: 5px; }
.mb-progress > i { transition: width 0.12s linear; }
.g-mathblitz.low-time .mb-time { color: #ff7b88; }
.g-mathblitz.low-time .mb-progress > i { background: linear-gradient(90deg, #ff7b88, #ff5c6c); }

/* ------------------------------ 算式 ------------------------------ */

.mb-eq-wrap {
  flex: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 18px 10px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg,
      color-mix(in srgb, var(--accent) 8%, transparent),
      rgba(255, 255, 255, 0.018));
}
.mb-eq {
  font-size: min(12vw, 46px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  text-align: center;
  color: #fff2e6;
  text-shadow: 0 2px 18px color-mix(in srgb, var(--accent) 32%, transparent);
}
.mb-eq-sub { font-size: 10.5px; color: var(--faint); letter-spacing: 0.02em; }

/* ------------------------------ 答案泡泡 ------------------------------ */

.mb-bubbles {
  flex: none;
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 10px;
  padding: 2px 0;
}
.mb-bubble {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 0;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.16);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  touch-action: manipulation;
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, 0.28),
    inset 0 -10px 24px rgba(0, 0, 0, 0.22),
    0 14px 28px -18px rgba(0, 0, 0, 0.9);
  transition: transform 0.1s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}
.mb-bubble::before {
  content: "";
  position: absolute;
  left: 18%;
  top: 11%;
  width: 40%;
  height: 24%;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(255, 255, 255, 0.55), transparent 70%);
  pointer-events: none;
}
.mb-bubble:active { transform: scale(0.96); }
.mb-bubble.b0 { background: radial-gradient(circle at 34% 28%, #ffd6b8, #ff9e5c 46%, #c9642f 100%); }
.mb-bubble.b1 { background: radial-gradient(circle at 34% 28%, #c8f2e6, #5fe0c8 46%, #2f9c88 100%); }
.mb-bubble.b2 { background: radial-gradient(circle at 34% 28%, #d7d9ff, #8f9dfa 46%, #4f5fce 100%); }
.mb-bubble.b3 { background: radial-gradient(circle at 34% 28%, #ffd6ec, #ff7ab8 46%, #c94a8a 100%); }
.mb-bubble-v {
  position: relative;
  z-index: 1;
  font-size: min(8vw, 31px);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: #1a1208;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.4);
  letter-spacing: -0.01em;
}
.mb-bubble.ok {
  border-color: rgba(62, 207, 142, 0.9);
  box-shadow: 0 0 0 3px rgba(62, 207, 142, 0.45), 0 0 30px rgba(62, 207, 142, 0.5);
  animation: mbOk 0.28s cubic-bezier(0.22, 1.2, 0.36, 1) both;
}
.mb-bubble.bad {
  border-color: rgba(255, 92, 108, 0.9);
  box-shadow: 0 0 0 3px rgba(255, 92, 108, 0.4), 0 0 26px rgba(255, 92, 108, 0.4);
  animation: mbBad 0.3s ease both;
}
.mb-bubble.ok.show { opacity: 0.92; }
.mb-pop {
  position: absolute;
  left: 50%;
  top: 18%;
  z-index: 2;
  transform: translateX(-50%);
  font-size: 20px;
  font-weight: 800;
  color: #3ecf8e;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.45);
  pointer-events: none;
  animation: mbPop 0.55s cubic-bezier(0.2, 0.8, 0.3, 1) both;
}

.mb-foot {
  flex: none;
  min-height: 18px;
  text-align: center;
  font-size: 10.5px;
  color: var(--faint);
}

.g-mathblitz.shake .mb-bubbles { animation: mbShake 0.28s ease; }

/* ------------------------------ 开始页 ------------------------------ */

.mb-start { gap: 12px; }
.mb-startp { display: flex; flex-direction: column; }
.mb-start .seg-item { min-height: 42px; font-size: 13px; }
.mb-desc {
  margin-top: 9px;
  font-size: 11.5px;
  color: var(--faint);
}
.mb-bestlist { display: flex; flex-direction: column; margin-top: 2px; }
.mb-brow {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 10px;
  padding: 6px 2px;
  border-bottom: 1px solid var(--line);
  border-radius: 8px;
}
.mb-brow:last-child { border-bottom: 0; }
.mb-brow .n { font-size: 12.5px; color: var(--dim); }
.mb-brow .b { font-size: 12.5px; font-weight: 700; font-variant-numeric: tabular-nums; }
.mb-brow .c { font-size: 10.5px; color: var(--faint); min-width: 36px; text-align: right; }
.mb-brow.cur { background: color-mix(in srgb, var(--accent) 9%, transparent); }
.mb-brow.cur .n { color: var(--text); font-weight: 600; }
.mb-start-btn { margin-top: 14px; min-height: 48px; }
.mb-foot.hint { margin-top: auto; padding-top: 8px; text-align: center; font-size: 11px; }

/* ------------------------------ 结算 ------------------------------ */

.mb-resultwrap { gap: 12px; }
.mb-result {
  flex: none;
  border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--ok) 30%, var(--line));
  background: linear-gradient(165deg,
      color-mix(in srgb, var(--ok) 10%, transparent),
      rgba(255, 255, 255, 0.02));
  padding: 14px var(--pad) 15px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: mbUp 0.32s cubic-bezier(0.22, 0.9, 0.3, 1) both;
}
.mb-result-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}
.mb-result-k {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11.5px;
  color: var(--dim);
  letter-spacing: 0.04em;
}
.mb-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 8px var(--ok);
  flex: none;
}
.mb-result-score {
  margin-top: 2px;
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
}
.mb-result-unit { font-size: 16px; font-weight: 700; color: var(--dim); margin-left: 4px; }
.mb-result-meta {
  text-align: right;
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}
.mb-best { color: var(--dim); }
.mb-best.new { color: var(--ok); font-weight: 700; }
.mb-rstats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}
.mb-rstat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 7px 3px;
  text-align: center;
}
.mb-rstat b {
  display: block;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.3;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.mb-rstat span { font-size: 9.5px; color: var(--faint); }
.mb-result .btn-row .btn { min-height: 44px; }
.mb-result-sub { display: flex; }
.mb-result-sub .btn { flex: 1; }

/* ------------------------------ 动画 ------------------------------ */

@keyframes mbOk {
  0% { transform: scale(1); }
  45% { transform: scale(1.08); }
  100% { transform: scale(1); }
}
@keyframes mbBad {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  55% { transform: translateX(6px); }
  80% { transform: translateX(-3px); }
}
@keyframes mbPop {
  0% { opacity: 0; transform: translate(-50%, 8px) scale(0.7); }
  25% { opacity: 1; transform: translate(-50%, 0) scale(1.05); }
  100% { opacity: 0; transform: translate(-50%, -26px) scale(1); }
}
@keyframes mbShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  55% { transform: translateX(5px); }
  80% { transform: translateX(-3px); }
}
@keyframes mbUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* ------------------------------ 小屏 / 矮屏适配 ------------------------------ */

@media (max-height: 710px) {
  .g-mathblitz { gap: 8px; }
  .mb-eq-wrap { padding: 12px 8px 11px; }
  .mb-eq { font-size: min(11.5vw, 40px); }
  .mb-bubbles { gap: 8px; }
  .mb-bubble-v { font-size: min(7.4vw, 27px); }
  .mb-start { gap: 10px; }
  .mb-start .panel { padding: 12px; }
  .mb-start-btn { margin-top: 10px; }
  .mb-foot.hint { display: none; }
  .mb-result { padding: 12px var(--pad) 13px; gap: 10px; }
  .mb-result-score { font-size: 34px; }
}

@media (max-width: 365px) {
  .g-mathblitz { gap: 8px; }
  .mb-bubble-v { font-size: min(7.2vw, 25px); }
  .mb-rstat b { font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  .mb-bubble.ok,
  .mb-bubble.bad,
  .g-mathblitz.shake .mb-bubbles { animation: none; }
  .mb-result { animation: none; }
}