:root {
  color-scheme: light;
  --ui-font: "Microsoft YaHei", "Noto Sans SC", "PingFang SC", Arial, sans-serif;
  --digit-font: "Segoe UI", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  --paper: #fffaf1;
  --ink: #2d241a;
  --muted: #756a5d;
  --line: #d7c7ac;
  --line-strong: #8f7350;
  --jade: #4c8c79;
  --jade-soft: #dceee7;
  --sakura: #d96f91;
  --sakura-soft: #ffe1ea;
  --gold: #c99a3f;
  --blue: #5e7fb9;
  --shadow: 0 18px 50px rgba(87, 60, 30, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 12%, rgba(255, 225, 234, 0.75), transparent 28%),
    linear-gradient(135deg, #fff7e9 0%, #f4fbf4 48%, #fff2f6 100%);
  font-family: var(--ui-font);
}

button,
input,
select {
  font: inherit;
}

button {
  border: 1px solid rgba(143, 115, 80, 0.32);
  border-radius: 8px;
  color: var(--ink);
  background: linear-gradient(180deg, #fffdf8, #f7ead3);
  box-shadow: 0 3px 0 rgba(143, 115, 80, 0.24);
  cursor: pointer;
  min-height: 38px;
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}

button:hover:not(:disabled) {
  border-color: rgba(217, 111, 145, 0.68);
  transform: translateY(-1px);
}

button:active:not(:disabled) {
  box-shadow: 0 1px 0 rgba(143, 115, 80, 0.28);
  transform: translateY(1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(620px, 720px) 460px;
  gap: 24px;
  max-width: 1250px;
  margin: 0 auto;
  padding: 28px;
  align-items: start;
}

.game-area,
.control-panel {
  border: 1px solid rgba(143, 115, 80, 0.25);
  border-radius: 8px;
  background: rgba(255, 250, 241, 0.88);
  box-shadow: var(--shadow);
}

.game-area {
  display: flex;
  flex-direction: column;
  padding: 24px 24px 0;
  height: 820px;
}

.brand {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--jade);
  font-size: 13px;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 42px;
  font-weight: 700;
}

.status-strip {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.status-strip span {
  min-width: 72px;
  padding: 7px 10px;
  border: 1px solid rgba(76, 140, 121, 0.24);
  border-radius: 8px;
  background: rgba(220, 238, 231, 0.72);
  text-align: center;
  font-family: var(--digit-font);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  width: min(100%, 680px);
  aspect-ratio: 1;
  margin: 0 auto;
  border: 3px solid var(--line-strong);
  background: var(--line-strong);
  user-select: none;
}

.cell {
  position: relative;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.96);
  color: var(--ink);
  font-family: var(--digit-font);
  font-size: 42px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, transform 120ms ease;
}

.cell:nth-child(3n) {
  border-right-color: var(--line-strong);
}

.cell:nth-child(n + 19):nth-child(-n + 27),
.cell:nth-child(n + 46):nth-child(-n + 54) {
  border-bottom-color: var(--line-strong);
}

.cell.box-right {
  border-right-width: 3px;
}

.cell.box-bottom {
  border-bottom-width: 3px;
}

.cell.selected {
  outline: 3px solid rgba(217, 111, 145, 0.68);
  outline-offset: -4px;
  z-index: 2;
}

.cell.same {
  color: #d7357a;
  background: #ffe6f0;
  text-shadow: 0 0 10px rgba(217, 111, 145, 0.42);
}

.cell.related {
  background: #d9f2ff;
  box-shadow: inset 0 0 0 2px rgba(35, 143, 185, 0.18);
}

.cell.related.same {
  color: #d7357a;
  background: #ffe6f0;
}

.cell.given {
  color: #5b4226;
  background: #f4e2c1;
}

.cell.draft {
  color: var(--blue);
}

.cell.confirmed {
  color: #5b4226;
  background: #f4e2c1;
}

.cell.hinted {
  color: #8f4d12;
  background: #ffe7a8;
}

.cell.given.same,
.cell.draft.same,
.cell.confirmed.same,
.cell.hinted.same {
  color: #d7357a;
}

.cell.bump {
  animation: bump 220ms ease;
}

.cell.spark::after {
  content: "✦";
  position: absolute;
  top: 8px;
  right: 10px;
  color: var(--sakura);
  font-size: 16px;
  animation: sparkle 520ms ease forwards;
}

.seed-row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(143, 115, 80, 0.22);
  border-radius: 8px;
  background: rgba(255, 253, 248, 0.74);
  padding: 10px 12px;
}

.seed-row input,
.settings select {
  min-height: 38px;
  border: 1px solid rgba(143, 115, 80, 0.34);
  border-radius: 8px;
  padding: 0 10px;
  color: var(--ink);
  background: #fffdf8;
}

.seed-row input {
  font-family: var(--digit-font);
  font-variant-numeric: tabular-nums;
}

.number-progress {
  width: 100%;
  margin: 0;
  padding: 10px 12px;
  border: 1px solid rgba(35, 143, 185, 0.24);
  border-radius: 8px;
  background: rgba(235, 249, 255, 0.68);
}

.number-progress .panel-title {
  margin-bottom: 7px;
  color: #235f7b;
}

.number-progress-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 5px;
}

.number-progress-item {
  display: grid;
  place-items: center;
  min-height: 38px;
  padding: 4px 2px;
  border: 1px solid rgba(35, 143, 185, 0.24);
  border-radius: 8px;
  color: #235f7b;
  background: #ffffff;
  font-family: var(--digit-font);
  font-variant-numeric: tabular-nums;
}

.number-progress-item strong {
  font-size: 18px;
  line-height: 1;
}

.number-progress-item span {
  color: #6c8897;
  font-size: 12px;
  line-height: 1;
}

.number-progress-item.filled {
  color: #6c4a12;
  background: #ffe7a8;
  border-color: rgba(201, 154, 63, 0.55);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.45);
}

.number-progress-item.almost {
  color: #7b2347;
  background: linear-gradient(180deg, #ffe1ea, #ffd0df);
  border-color: rgba(217, 111, 145, 0.86);
  box-shadow:
    inset 0 0 0 2px rgba(255, 255, 255, 0.62),
    0 0 0 2px rgba(217, 111, 145, 0.18);
}

.number-progress-item.filled span {
  color: #7b5a1d;
}

.number-progress-item.almost span {
  color: #8f3158;
  font-weight: 700;
}

.control-panel {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto auto auto auto auto auto minmax(0, 1fr);
  gap: 12px;
  padding: 16px;
  height: 820px;
  min-height: 0;
  overflow: hidden;
}

.mascot-panel,
.guide-panel,
.number-progress,
.records {
  grid-column: auto;
}

.mascot-panel,
.guide-panel,
.settings,
.seed-row,
.records {
  border: 1px solid rgba(143, 115, 80, 0.22);
  border-radius: 8px;
  background: rgba(255, 253, 248, 0.74);
  padding: 12px;
}

.mascot-panel {
  display: grid;
  grid-template-columns: 76px 1fr;
  align-items: center;
  gap: 12px;
}

.mascot-image {
  width: 72px;
  height: 72px;
  border: 2px solid rgba(42, 92, 134, 0.22);
  border-radius: 12px;
  background: #eaf7ff;
  box-shadow: 0 10px 24px rgba(42, 92, 134, 0.18);
  object-fit: cover;
}

.panel-title {
  margin: 0 0 6px;
  font-weight: 700;
}

#mascotLine {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.guide-panel {
  padding: 12px;
}

.guide-panel ul {
  display: grid;
  gap: 6px;
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
}

.guide-panel li {
  display: grid;
  grid-template-columns: 88px 1fr;
  align-items: center;
  gap: 8px;
  min-height: 24px;
  padding: 3px 7px;
  border-radius: 8px;
  background: rgba(255, 246, 214, 0.52);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
}

.guide-panel strong {
  color: #7b4b61;
  font-weight: 700;
}

.guide-panel span {
  color: var(--muted);
}

.settings {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
}

.actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 0;
  border: 0;
  background: transparent;
}

.actions button:first-child,
.actions #againBtn {
  grid-column: auto;
}

.hidden {
  display: none;
}

.records-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.records-head button {
  min-height: 30px;
  padding: 0 10px;
  font-size: 13px;
}

.records {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

#recordsList {
  display: grid;
  gap: 6px;
  min-height: 0;
  max-height: none;
  margin: 8px 0 0;
  padding-left: 20px;
  overflow: auto;
}

#recordsList li {
  color: var(--muted);
  font-family: var(--digit-font);
  font-variant-numeric: tabular-nums;
  line-height: 1.45;
}

.toast {
  position: fixed;
  left: 50%;
  top: 50%;
  min-width: 260px;
  max-width: min(420px, calc(100vw - 32px));
  padding: 16px 22px;
  border: 1px solid rgba(143, 115, 80, 0.24);
  border-radius: 8px;
  color: var(--ink);
  background: rgba(255, 250, 241, 0.96);
  box-shadow: var(--shadow);
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  z-index: 20;
  transform: translate(-50%, -50%) scale(0.92);
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.08);
}

.guide-modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 28px;
  background: rgba(45, 36, 26, 0.34);
  backdrop-filter: blur(3px);
  z-index: 30;
}

.guide-modal.hidden {
  display: none;
}

.guide-modal-card {
  position: relative;
  width: min(430px, 100%);
  padding: 24px;
  border: 1px solid rgba(143, 115, 80, 0.28);
  border-radius: 8px;
  color: var(--ink);
  background: rgba(255, 250, 241, 0.98);
  box-shadow: var(--shadow);
}

.guide-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  display: grid;
  place-items: center;
  width: 34px;
  min-height: 34px;
  padding: 0;
  font-size: 22px;
  line-height: 1;
}

.guide-modal-kicker {
  margin: 0 44px 4px 0;
  color: var(--jade);
  font-size: 13px;
  font-weight: 700;
}

.guide-modal h2 {
  margin: 0 44px 14px 0;
  font-size: 28px;
  line-height: 1.2;
}

.guide-modal ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-modal li {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 10px;
  align-items: center;
  min-height: 36px;
  padding: 8px 10px;
  border-radius: 8px;
  background: rgba(255, 246, 214, 0.62);
  line-height: 1.4;
}

.guide-modal li strong {
  color: #7b4b61;
}

.guide-modal li span {
  color: var(--muted);
}

.guide-modal-done {
  width: 100%;
  margin-top: 16px;
  font-weight: 700;
}

@keyframes bump {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
}

@keyframes sparkle {
  0% {
    opacity: 0;
    transform: translateY(6px) scale(0.6);
  }
  60% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translateY(-10px) scale(1.2);
  }
}

@media (max-width: 1020px) {
  .app-shell {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .control-panel {
    max-width: 680px;
    width: 100%;
    height: auto;
    margin: 0 auto;
  }

  .game-area {
    height: auto;
  }
}

@media (max-width: 640px) {
  .brand {
    align-items: flex-start;
    flex-direction: column;
  }

  h1 {
    font-size: 34px;
  }

  .game-area {
    padding: 14px;
  }


  .seed-row {
    grid-template-columns: 1fr;
  }
}