:root {
  color-scheme: light;
  --bg: #f1faf4;
  --panel: #ffffff;
  --ink: #16362a;
  --muted: #5c7f6d;
  --line: #cfe8da;
  --board: #dcefe3;
  --empty: #eaf7ee;
  --accent: #158450;
  --accent-ink: #ffffff;
  --shadow: 0 10px 24px rgba(22, 74, 52, 0.14);
  --t2: #dcf3e3; --t2-ink: #14472f;
  --t4: #c3ebcf; --t4-ink: #14472f;
  --t8: #a5e0b8; --t8-ink: #123f2a;
  --t16: #85d3a1; --t16-ink: #0f3a26;
  --t32: #66c78e; --t32-ink: #0b2f20;
  --t64: #48b878; --t64-ink: #082a1b;
  --t128: #24804f; --t128-ink: #ffffff;
  --t256: #1e744e; --t256-ink: #ffffff;
  --t512: #176241; --t512-ink: #ffffff;
  --t1024: #12523a; --t1024-ink: #ffffff;
  --t2048: #0d4430; --t2048-ink: #ffffff;
  --tbig: #0a3a29; --tbig-ink: #ffffff;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0c1a13;
  --panel: #14261c;
  --ink: #e6f5ec;
  --muted: #9dc0ad;
  --line: #24402f;
  --board: #172b21;
  --empty: #1d3529;
  --accent: #34d399;
  --accent-ink: #052b1c;
  --shadow: 0 10px 24px rgba(0, 0, 0, 0.45);
  --t2: #22382c; --t2-ink: #d9f2e3;
  --t4: #2b4636; --t4-ink: #ddf6e6;
  --t8: #345640; --t8-ink: #e8f9ee;
  --t16: #3d6b4c; --t16-ink: #eefcf3;
  --t32: #2c8456; --t32-ink: #ffffff;
  --t64: #269b66; --t64-ink: #04231a;
  --t128: #1f9f6a; --t128-ink: #04231a;
  --t256: #24ad74; --t256-ink: #04231a;
  --t512: #2bbc7f; --t512-ink: #04231a;
  --t1024: #34cc8a; --t1024-ink: #032218;
  --t2048: #3fdf96; --t2048-ink: #032218;
  --tbig: #55eda6; --tbig-ink: #032218;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-text-size-adjust: 100%;
}

body { overflow-x: hidden; }

.app {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  padding: 12px 12px 16px;
}

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

h1 {
  margin: 0;
  font-size: 19px;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.scores { display: flex; gap: 6px; }

.score-card {
  min-width: 62px;
  padding: 5px 10px;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  text-align: center;
  box-shadow: var(--shadow);
}

.score-label { display: block; font-size: 10px; color: var(--muted); letter-spacing: 0.08em; }
.score-card strong { font-size: 16px; font-variant-numeric: tabular-nums; }

.status {
  margin: 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--panel) 80%, transparent);
  border: 1px solid var(--line);
}

.status.error { color: #b3261e; border-color: #e7b4ae; background: #fdecea; }
html[data-theme="dark"] .status.error { color: #ffb4a8; border-color: #6d322c; background: #3a201d; }

.status-actions { display: flex; gap: 8px; }

.stage { display: flex; flex-direction: column; gap: 10px; }

.board-wrap { position: relative; }

.board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 7px;
  width: 100%;
  aspect-ratio: 1 / 1;
  padding: 7px;
  border-radius: 16px;
  background: var(--board);
  border: 1px solid var(--line);
  touch-action: none;
  outline: none;
  user-select: none;
}

.board:focus-visible { box-shadow: 0 0 0 3px var(--accent); }

.cell {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 11px;
  background: var(--empty);
  font-weight: 700;
  font-size: clamp(15px, 6.2vw, 26px);
  font-variant-numeric: tabular-nums;
  min-width: 0;
  overflow: hidden;
  animation: pop 120ms ease-out;
}

.cell.small { font-size: clamp(12px, 4.6vw, 19px); }
.cell[data-value="0"] { animation: none; }
.cell[data-value="2"] { background: var(--t2); color: var(--t2-ink); }
.cell[data-value="4"] { background: var(--t4); color: var(--t4-ink); }
.cell[data-value="8"] { background: var(--t8); color: var(--t8-ink); }
.cell[data-value="16"] { background: var(--t16); color: var(--t16-ink); }
.cell[data-value="32"] { background: var(--t32); color: var(--t32-ink); }
.cell[data-value="64"] { background: var(--t64); color: var(--t64-ink); }
.cell[data-value="128"] { background: var(--t128); color: var(--t128-ink); }
.cell[data-value="256"] { background: var(--t256); color: var(--t256-ink); }
.cell[data-value="512"] { background: var(--t512); color: var(--t512-ink); }
.cell[data-value="1024"] { background: var(--t1024); color: var(--t1024-ink); }
.cell[data-value="2048"] { background: var(--t2048); color: var(--t2048-ink); }
.cell[data-big="1"] { background: var(--tbig); color: var(--tbig-ink); }

@keyframes pop {
  from { transform: scale(0.86); opacity: 0.6; }
  to { transform: scale(1); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .cell { animation: none; }
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: 16px;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(2px);
  border: 1px solid var(--line);
  padding: 12px;
  text-align: center;
}

.overlay-title { margin: 0; font-size: 16px; font-weight: 700; }
.overlay-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }

.controls { display: flex; gap: 8px; }

.btn {
  min-height: 44px;
  min-width: 44px;
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.btn:disabled { opacity: 0.45; cursor: not-allowed; box-shadow: none; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn:active:not(:disabled) { transform: translateY(1px); }
.controls .btn { flex: 1; }

.pad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(2, auto);
  gap: 6px;
  max-width: 240px;
  margin: 0 auto;
  width: 100%;
}

.pad-btn { font-size: 18px; padding: 0; }
.pad-btn.up { grid-column: 2; grid-row: 1; }
.pad-btn.left { grid-column: 1; grid-row: 2; }
.pad-btn.down { grid-column: 2; grid-row: 2; }
.pad-btn.right { grid-column: 3; grid-row: 2; }

.foot { margin: 0; font-size: 11px; color: var(--muted); text-align: center; }

@media (max-width: 360px) {
  .app { padding: 10px 10px 14px; }
  h1 { font-size: 17px; }
  .score-card { min-width: 56px; padding: 4px 8px; }
  .board { gap: 5px; padding: 5px; }
  .cell { border-radius: 9px; }
}

.status.local { border-style: dashed; }

/* ---------- 个人空间整页（nav.home / page_content） ---------- */

.space-shell {
  display: flex;
  flex-direction: column;
  gap: 18px;
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 28px clamp(16px, 4vw, 40px) 36px;
}

.space-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.space-brand { display: flex; flex-direction: column; gap: 6px; max-width: 620px; }

.space-badge {
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 70%, transparent);
  color: var(--accent);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.space .space-brand h1 { margin: 0; font-size: clamp(22px, 3vw, 30px); }

.space-subtitle { margin: 0; font-size: 13px; line-height: 1.7; color: var(--muted); }

.space-scores { display: flex; gap: 10px; }
.space-scores .score-card { min-width: 88px; padding: 8px 14px; }
.space-scores .score-card strong { font-size: 22px; }

.space .status { font-size: 13px; padding: 8px 12px; }

.space-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 0.62fr);
  gap: clamp(16px, 3vw, 32px);
  align-items: start;
}

.space-main { display: flex; flex-direction: column; gap: 14px; min-width: 0; }

.space-main .board { gap: 10px; padding: 10px; border-radius: 20px; }
.space-main .cell { border-radius: 14px; font-size: clamp(20px, 4.2vw, 38px); }
.space-main .cell.small { font-size: clamp(15px, 3vw, 27px); }
.space-main .board-wrap .overlay { border-radius: 20px; }
.space-main .controls .btn { min-height: 48px; }

.space-aside { display: flex; flex-direction: column; gap: 14px; min-width: 0; }

.space-card {
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.space-card h2 {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.space-metrics {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.space-metrics div {
  padding: 10px 12px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--board) 62%, transparent);
}

.space-metrics dt { font-size: 11px; color: var(--muted); letter-spacing: 0.06em; }
.space-metrics dd { margin: 4px 0 0; font-size: 20px; font-weight: 700; font-variant-numeric: tabular-nums; }

.space-list { margin: 0; padding-left: 18px; font-size: 13px; line-height: 1.9; }
.space-list li::marker { color: var(--accent); }

.space .foot { text-align: left; }

@media (max-width: 900px) {
  .space-shell { padding: 20px 14px 28px; gap: 14px; }
  .space-stage { grid-template-columns: minmax(0, 1fr); }
  .space-scores .score-card { min-width: 74px; padding: 6px 10px; }
  .space-scores .score-card strong { font-size: 18px; }
}

@media (max-width: 420px) {
  .space-main .board { gap: 6px; padding: 6px; }
  .space-main .cell { border-radius: 10px; }
  .space-metrics { gap: 8px; }
}