/* ============================================================
   手写数字识别
   ============================================================ */

.digit-board-grid { align-items: stretch; }

.digit-pad-wrap {
  display: grid;
  place-items: center;
  margin-top: 14px;
}
#pad {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  aspect-ratio: 1;
  background: #151b30;
  border-radius: 18px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08), 0 8px 20px rgba(27, 35, 64, 0.16);
  touch-action: none;
  cursor: crosshair;
}

.digit-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: 14px;
}
.digit-live {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-2);
  cursor: pointer;
}
.digit-live input { width: 18px; height: 18px; accent-color: var(--blue); }

.digit-grid {
  display: grid;
  grid-template-columns: repeat(16, minmax(0, 1fr));
  gap: 1px;
  width: min(100%, 300px);
  margin: 14px auto 12px;
  padding: 1px;
  background: #dfe4f0;
  border: 1px solid #dfe4f0;
  border-radius: 12px;
  overflow: hidden;
}
.digit-grid span {
  display: block;
  aspect-ratio: 1;
  background: #f3f5fa;
  transition: background 0.12s ease;
}
.digit-grid span.on { background: var(--ink); }

.digit-guess {
  display: grid;
  grid-template-columns: minmax(220px, 320px) minmax(0, 1fr);
  align-items: center;
  gap: 22px 44px;
}
.digit-guess__answer { min-width: 0; }
.digit-guess__bars { min-width: 0; }

.digit-answer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  min-height: 88px;
}
.digit-answer__label {
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--faint);
}
.digit-answer__num {
  font-size: 88px;
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--blue-deep);
  min-width: 1.1em;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.digit-answer__num.is-empty { color: var(--faint); }
.digit-answer__conf {
  font-size: 20px;
  font-weight: 900;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}
.digit-note {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 15px;
  font-weight: 600;
}

.digit-bars {
  display: grid;
  gap: 7px;
}
.digit-bar {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) 54px;
  align-items: center;
  gap: 10px;
}
.digit-bar__d {
  font-size: 17px;
  font-weight: 900;
  text-align: center;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.digit-bar__track {
  height: 14px;
  border-radius: 7px;
  background: #eef1f8;
  overflow: hidden;
}
.digit-bar__fill {
  width: 0;
  height: 100%;
  border-radius: 7px;
  background: var(--blue);
  transition: width 0.18s ease, background 0.18s ease;
}
.digit-bar__p {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.digit-bar.is-top .digit-bar__d,
.digit-bar.is-top .digit-bar__p { color: var(--green); }
.digit-bar.is-top .digit-bar__fill { background: var(--green); }

.digit-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 2px 0 16px;
}
.digit-flow__node {
  min-width: 78px;
  padding: 10px 14px;
  border-radius: 14px;
  background: #fff8e8;
  border: 1px solid #f0d9a6;
  text-align: center;
}
.digit-flow__node b {
  display: block;
  font-size: 21px;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}
.digit-flow__node span { font-size: 12px; font-weight: 700; color: var(--muted); }
.digit-flow__node--in { background: var(--green-soft); border-color: #b7e5d1; }
.digit-flow__node--out { background: var(--orange-soft); border-color: #f7d5b8; }
.digit-flow__arrow { color: var(--faint); font-size: 18px; font-weight: 900; }

.digit-msg { min-height: 1.6em; margin: 8px 0 0; color: var(--muted); }
.digit-msg.is-error { color: var(--red); font-weight: 700; }
.digit-table-wrap { margin-top: 12px; }
.digit-table-wrap[hidden] { display: none; }

.digit-nerd { margin-top: 20px; }
.digit-nerd textarea {
  width: 100%;
  min-height: 116px;
  margin-top: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcff;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  resize: vertical;
}
.digit-nerd textarea:focus { outline: 3px solid #b9ccff; outline-offset: 1px; }
.digit-nerd .digit-toolbar { margin-top: 10px; }

@media (max-width: 780px) {
  .digit-board-grid { grid-template-columns: 1fr; }
  .digit-guess { grid-template-columns: 1fr; gap: 16px; }
}

/* 手机上先只看最后分数和概率，别让表格横向滚动 */
@media (max-width: 700px) {
  .digit-table-wrap .table { min-width: 0; font-size: 13.5px; }
  .digit-table-wrap .table th,
  .digit-table-wrap .table td { padding: 9px 8px; }
  .digit-table-wrap .table th:nth-child(2),
  .digit-table-wrap .table td:nth-child(2),
  .digit-table-wrap .table th:nth-child(3),
  .digit-table-wrap .table td:nth-child(3) { display: none; }
}
@media (max-width: 520px) {
  .digit-answer { min-height: 80px; }
  .digit-answer__num { font-size: 72px; }
  .digit-answer__conf { font-size: 17px; }
  .digit-bar { grid-template-columns: 22px minmax(0, 1fr) 48px; gap: 8px; }

  .digit-flow {
    flex-direction: column;
    align-items: stretch;
    gap: 3px;
    margin-bottom: 14px;
  }
  .digit-flow__node {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 10px;
    min-width: 0;
    padding: 9px 14px;
    text-align: left;
  }
  .digit-flow__node b { display: inline; font-size: 19px; }
  .digit-flow__arrow {
    transform: rotate(90deg);
    align-self: center;
    font-size: 14px;
    line-height: 1;
  }
}