/* 井字棋 · 薄荷绿糖果风
   浅色沿用门户首页的 Poki 薄荷绿族，深色模式走同色系的霓虹转向。
   全部动效在 prefers-reduced-motion 下降级为瞬时。 */

:root {
  --mint: #83ffe7;
  --mint-deep: #12c2a0;
  --ink: #002b50;
  --ink-soft: #4a6b8a;
  --accent: #009cff;
  --paper: #f1fbfa;
  --surface: #ffffff;
  --candy-red: #ff5c7a;
  --candy-blue: #009cff;
  --gold: #ffb627;
  --line: rgba(0, 43, 80, 0.13);
  --line-soft: rgba(0, 43, 80, 0.09);
  --shadow: rgba(93, 107, 132, 0.22);
  --radius: 16px;
  --gap: 16px;
  color-scheme: light;
}

html[data-theme="dark"] {
  --mint: #4fe3c8;
  --mint-deep: #2ec7a8;
  --ink: #e6f7ff;
  --ink-soft: #9fc2da;
  --accent: #4fc3ff;
  --paper: #061a2b;
  --surface: #0e2740;
  --candy-red: #ff7a92;
  --candy-blue: #4fc3ff;
  --gold: #ffc957;
  --line: rgba(150, 205, 255, 0.18);
  --line-soft: rgba(150, 205, 255, 0.12);
  --shadow: rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: clamp(16px, 4vw, 40px) 16px 48px;
  background: var(--paper);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

.stage {
  max-width: 520px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

/* ---------- 头部 ---------- */

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

.title {
  margin: 0;
  font-size: clamp(28px, 7vw, 38px);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.lede {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.back a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
  box-shadow: 0 4px 12px -6px var(--shadow);
  white-space: nowrap;
}

.back a:hover {
  border-color: var(--mint-deep);
}

/* ---------- 设置区 ---------- */

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

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-group[hidden] {
  display: none;
}

.control-label {
  font-size: 12px;
  color: var(--ink-soft);
  padding-left: 2px;
}

.segmented {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: 0 4px 12px -6px var(--shadow);
}

.seg {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font: inherit;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}

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

.seg[aria-pressed="true"] {
  background: var(--mint);
  color: #00352c;
  font-weight: 600;
}

html[data-theme="dark"] .seg[aria-pressed="true"] {
  background: var(--mint-deep);
  color: #04231d;
}

/* ---------- 战绩 HUD ---------- */

.hud {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.hud-card {
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 10px 12px;
  box-shadow: 0 6px 16px -10px var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hud-tag {
  font-size: 11px;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hud-value {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
}

.hud-unit {
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-soft);
  margin-left: 2px;
}

.hud-value.is-bump {
  animation: bump 380ms cubic-bezier(0.2, 1.3, 0.3, 1);
}

@keyframes bump {
  0% { transform: scale(1); }
  40% { transform: scale(1.22); color: var(--mint-deep); }
  100% { transform: scale(1); }
}

/* ---------- 棋盘 ---------- */

.board-stage {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.board-wrap {
  position: relative;
}

.board {
  display: grid;
  grid-template-columns: repeat(var(--size, 3), 1fr);
  gap: clamp(8px, 2.2vw, 12px);
  padding: clamp(10px, 2.6vw, 16px);
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: 26px;
  box-shadow: 0 16px 30px -18px var(--shadow);
}

.board.is-draw {
  animation: shake 400ms ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.cell {
  appearance: none;
  position: relative;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  padding: 0;
  border-radius: 18px;
  border: 2px dashed var(--line);
  background: var(--paper);
  color: inherit;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}

.cell[data-mark="x"],
.cell[data-mark="o"] {
  border-style: solid;
  border-color: var(--line-soft);
  background: var(--surface);
}

.cell:disabled {
  cursor: default;
}

.cell:not(:disabled):hover {
  transform: translateY(-2px);
  border-color: var(--mint-deep);
  background: var(--surface);
}

.cell:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.cell.is-fresh {
  animation: pop 280ms cubic-bezier(0.2, 1.25, 0.3, 1);
}

@keyframes pop {
  0% { transform: scale(1); }
  42% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

.cell.is-win {
  animation: flash 560ms ease-out 2;
}

@keyframes flash {
  0%, 100% { background: var(--surface); }
  50% { background: var(--mint); }
}

html[data-theme="dark"] .cell.is-win {
  animation-name: flash-dark;
}

@keyframes flash-dark {
  0%, 100% { background: var(--surface); }
  50% { background: #17513f; }
}

.mark {
  width: 58%;
  height: 58%;
  overflow: visible;
}

.mark-stroke {
  fill: none;
  stroke-width: 9;
  stroke-linecap: round;
  stroke-dasharray: var(--len, 120);
  stroke-dashoffset: var(--len, 120);
  animation: draw 200ms cubic-bezier(0.25, 0.8, 0.35, 1) forwards;
}

.mark-stroke.delay {
  animation-delay: 85ms;
}

.mark-x .mark-stroke {
  stroke: var(--candy-red);
}

.mark-o .mark-stroke {
  stroke: var(--candy-blue);
}

@keyframes draw {
  to { stroke-dashoffset: 0; }
}

.win-line {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.win-line path {
  fill: none;
  stroke: var(--gold);
  stroke-width: 11;
  stroke-linecap: round;
  stroke-dasharray: var(--len, 400);
  stroke-dashoffset: var(--len, 400);
  animation: draw 340ms 90ms ease-out forwards;
}

.status {
  margin: 0;
  min-height: 22px;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  color: var(--ink);
}

.status.is-thinking {
  color: var(--ink-soft);
  font-weight: 500;
}

.status.is-thinking::after {
  content: "";
  display: inline-block;
  width: 1.6em;
  text-align: left;
  animation: dots 1.2s steps(4, end) infinite;
}

@keyframes dots {
  0% { content: ""; }
  25% { content: "·"; }
  50% { content: "··"; }
  75% { content: "···"; }
}

.score-line {
  margin: 0;
  min-height: 18px;
  text-align: center;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------- 工具条 ---------- */

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

.btn {
  appearance: none;
  font: inherit;
  font-size: 14px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 6px 14px -10px var(--shadow);
  transition: transform 0.16s ease, border-color 0.16s ease, opacity 0.16s ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: var(--mint-deep);
}

.btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.btn-icon {
  width: 42px;
  padding: 10px 0;
  text-align: center;
}

.btn-icon[aria-pressed="false"] {
  opacity: 0.5;
}

.btn-primary {
  margin-left: auto;
  background: var(--mint);
  border-color: transparent;
  color: #00352c;
  font-weight: 700;
}

html[data-theme="dark"] .btn-primary {
  background: var(--mint-deep);
  color: #04231d;
}

/* ---------- 页脚 ---------- */

.footnote {
  font-size: 12px;
  color: var(--ink-soft);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footnote p {
  margin: 0;
}

kbd {
  font: inherit;
  font-size: 11px;
  padding: 1px 5px;
  border-radius: 5px;
  border: 1px solid var(--line);
  background: var(--surface);
}

/* ---------- 结算层 ---------- */

.result-layer {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(0, 20, 36, 0.42);
  backdrop-filter: blur(3px);
  z-index: 20;
}

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

.result-panel {
  width: min(360px, 100%);
  background: var(--surface);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 30px 60px -24px rgba(0, 20, 40, 0.5);
  text-align: center;
  animation: rise 320ms cubic-bezier(0.2, 1.1, 0.3, 1);
}

@keyframes rise {
  from { transform: translateY(14px) scale(0.97); opacity: 0; }
  to { transform: none; opacity: 1; }
}

.result-badge {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--mint-deep);
}

.result-title {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
}

.result-sub {
  margin: 6px 0 16px;
  font-size: 13px;
  color: var(--ink-soft);
}

.result-breakdown {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
  text-align: left;
}

.rb-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--paper);
}

.rb-row.rb-total {
  background: var(--mint);
  color: #00352c;
  font-weight: 700;
}

html[data-theme="dark"] .rb-row.rb-total {
  color: #04231d;
}

.result-actions {
  display: flex;
  gap: 10px;
}

.result-actions .btn {
  flex: 1;
}

.result-actions .btn-primary {
  margin-left: 0;
}

.noscript {
  text-align: center;
  padding: 20px;
}

@media (max-width: 420px) {
  .hud {
    grid-template-columns: repeat(2, 1fr);
  }

  .controls {
    gap: 10px;
  }

  .seg {
    padding: 6px 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .mark-stroke,
  .win-line path {
    stroke-dashoffset: 0;
  }
}