/* Neon Grid · 深色霓虹雷区
   未揭格 = 平涂面 + 下边框深投影（金属浮雕）；
   数字 1-8 走高饱和霓虹；雷是发光能量核心。 */

:root {
  --bg: #0b0e14;
  --panel: #151a22;
  --panel-2: #1b2029;
  --cell: #2b3341;
  --cell-edge: #171d27;
  --open: #151a22;
  --open-edge: #0e131a;
  --board-bg: #0e1116;
  --ink: #e6edf3;
  --ink-dim: #8b949e;
  --line: rgba(255, 255, 255, 0.08);
  --accent: #4cc9f0;
  --gold: #fbbf24;
  --danger: #f43f5e;
  --good: #4ade80;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.stage {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 16px calc(40px + env(safe-area-inset-bottom, 0px));
  display: grid;
  gap: 16px;
}

/* grid 隐式列默认 min-width:auto，会被超宽棋盘撑破视口 */
.stage > * {
  min-width: 0;
}

/* ---------- 头部 ---------- */

.hero {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.title {
  margin: 0;
  font-size: 28px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.lede {
  margin: 2px 0 0;
  color: var(--ink-dim);
  font-size: 14px;
}

.back a {
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 14px;
  border: 0.5px solid var(--line);
  border-radius: 999px;
  padding: 6px 14px;
  transition: color 0.2s, border-color 0.2s;
}

.back a:hover {
  color: var(--ink);
  border-color: var(--ink-dim);
}

/* ---------- 难度 ---------- */

.controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.segmented {
  display: inline-flex;
  background: var(--panel);
  border: 0.5px solid var(--line);
  border-radius: 10px;
  padding: 3px;
  gap: 3px;
}

.seg {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-dim);
  font: inherit;
  font-size: 14px;
  padding: 7px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.seg:hover {
  color: var(--ink);
}

.seg[aria-pressed="true"] {
  background: var(--panel-2);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
}

@media (max-width: 360px) {
  .seg {
    padding: 7px 10px;
    font-size: 13px;
  }
}

/* ---------- HUD ---------- */

.hud {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.hud-card {
  background: var(--panel);
  border: 0.5px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 16px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.hud-tag {
  color: var(--ink-dim);
  font-size: 13px;
  white-space: nowrap;
}

.hud-value {
  font: 500 20px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 480px) {
  .hud-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 8px 12px;
  }

  .hud-value {
    font-size: 18px;
  }
}

/* ---------- 棋盘 ---------- */

.board-stage {
  display: grid;
  gap: 10px;
  justify-items: center;
}

.status {
  margin: 0;
  min-height: 24px;
  font-size: 14px;
  color: var(--ink-dim);
}

.status[data-tone="good"] {
  color: var(--good);
}

.status[data-tone="bad"] {
  color: var(--danger);
}

.board-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  display: flex;
  justify-content: center;
  padding: 12px;
  background: var(--board-bg);
  border: 0.5px solid var(--line);
  border-radius: 16px;
}

.board-wrap::-webkit-scrollbar {
  height: 6px;
}

.board-wrap::-webkit-scrollbar-thumb {
  background: var(--cell);
  border-radius: 3px;
}

.board {
  display: grid;
  grid-template-columns: repeat(var(--cols, 9), var(--cellsize));
  gap: 3px;
  /* 84px = stage 两侧 padding 32 + wrap 内边距 24 + 边框与亚像素余量 */
  --cellsize: clamp(18px, calc((100vw - 84px) / var(--cols, 9)), 38px);
  touch-action: manipulation;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

.cell {
  appearance: none;
  border: 0;
  border-bottom: 2px solid var(--cell-edge);
  border-radius: 5px;
  background: var(--cell);
  color: var(--ink);
  width: var(--cellsize);
  height: var(--cellsize);
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font: 500 calc(var(--cellsize) * 0.5) / 1 ui-monospace, SFMono-Regular, Consolas, monospace;
  cursor: pointer;
  transition: background 0.12s, transform 0.12s;
}

@media (hover: hover) {
  .cell:not(.open):hover {
    background: #374152;
  }
}

.cell:not(.open):active {
  transform: scale(0.94);
}

.cell.open {
  background: var(--open);
  border-bottom-color: var(--open-edge);
  cursor: default;
}

.cell .icon {
  width: 58%;
  height: 58%;
}

/* 数字霓虹配色 */
.cell[data-n="1"] { color: #4cc9f0; }
.cell[data-n="2"] { color: #4ade80; }
.cell[data-n="3"] { color: #f472b6; }
.cell[data-n="4"] { color: #a78bfa; }
.cell[data-n="5"] { color: #fbbf24; }
.cell[data-n="6"] { color: #22d3ee; }
.cell[data-n="7"] { color: #fb7185; }
.cell[data-n="8"] { color: #e2e8f0; }

.cell.flagged {
  color: var(--danger);
  background: #322028;
  border-bottom-color: #20141a;
}

.cell.mine {
  color: #ffb3c1;
  background: #241b21;
  border-bottom-color: #171015;
}

.cell.boom {
  color: #fff;
  background: var(--danger);
  border-bottom-color: #9f1239;
}

.cell.wrong {
  color: var(--danger);
  font-size: calc(var(--cellsize) * 0.42);
}

/* 波纹展开：由近及远 scale-in */
.cell.pop {
  animation: cell-pop 0.26s both;
}

@keyframes cell-pop {
  from {
    transform: scale(0.55);
    opacity: 0.35;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* ---------- 工具行 ---------- */

.toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  appearance: none;
  border: 0.5px solid var(--line);
  background: var(--panel-2);
  color: var(--ink-dim);
  font: inherit;
  font-size: 14px;
  padding: 10px 18px;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn:hover {
  color: var(--ink);
  border-color: var(--ink-dim);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #04222e;
  font-weight: 500;
}

.btn-primary:hover {
  background: #6bd4f4;
  color: #04222e;
}

.btn-toggle.active {
  background: #2a2010;
  border-color: var(--gold);
  color: var(--gold);
}

/* ---------- 提示 ---------- */

.message {
  margin: 0;
  min-height: 22px;
  font-size: 14px;
  color: var(--ink-dim);
}

.message[data-tone="warn"] {
  color: var(--gold);
}

/* ---------- 结算浮层 ---------- */

.result-layer {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 12, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 10;
}

.result-layer[hidden] {
  display: none;
}

.result-panel {
  background: var(--panel);
  border: 0.5px solid var(--line);
  border-radius: 16px;
  padding: 28px 32px;
  max-width: 360px;
  width: 100%;
  text-align: center;
  display: grid;
  gap: 10px;
}

.result-badge {
  margin: 0;
  font: 500 12px/1 ui-monospace, monospace;
  letter-spacing: 0.28em;
  color: var(--ink-dim);
}

.result-badge[data-tone="good"] {
  color: var(--good);
}

.result-badge[data-tone="bad"] {
  color: var(--danger);
}

.result-title {
  margin: 0;
  font-size: 24px;
  font-weight: 500;
}

.result-sub {
  margin: 0;
  color: var(--ink-dim);
  font-size: 14px;
}

.result-rows {
  display: grid;
  gap: 6px;
  width: 100%;
  text-align: left;
  margin-top: 4px;
}

.result-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  padding: 6px 12px;
  background: var(--panel-2);
  border: 0.5px solid var(--line);
  border-radius: 10px;
}

.result-row span {
  color: var(--ink-dim);
}

.result-row b {
  font: 500 16px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  font-variant-numeric: tabular-nums;
}

.result-row .rec {
  margin-left: 6px;
  font: 500 11px/1 ui-monospace, monospace;
  letter-spacing: 0.1em;
  color: var(--gold);
  font-style: normal;
}

.result-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 8px;
}

/* ---------- 页脚 ---------- */

.footnote {
  color: var(--ink-dim);
  font-size: 13px;
  text-align: center;
}

.footnote p {
  margin: 4px 0;
}

.footnote kbd {
  border: 0.5px solid var(--line);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: ui-monospace, monospace;
  font-size: 12px;
}

@media (prefers-reduced-motion: reduce) {
  .cell,
  .cell.pop,
  .seg,
  .btn,
  .back a {
    transition: none;
    animation: none;
  }
}