/* ============================================================
   五子棋 · AlphaZero 人机对战
   视觉方向：暖木棋盘 + 冷灰界面，克制、清晰、耐看
   ============================================================ */

:root {
  --bg: #f4f1ec;
  --surface: #ffffff;
  --surface-sunken: #faf8f5;
  --border: #e3ddd3;
  --border-strong: #d3cabc;

  --ink: #2b2724;
  --ink-soft: #6d6459;
  --ink-faint: #9c9184;

  --accent: #2f6f5e;
  --accent-soft: #e6f0ec;
  --accent-ink: #1e4a3e;

  --danger: #b4472f;
  --warn: #b07d22;

  --board-bg: #dcb98a;
  --board-line: #6b4f2c;

  --radius: 12px;
  --radius-sm: 8px;

  --shadow-sm: 0 1px 2px rgba(43, 39, 36, .06);
  --shadow: 0 4px 16px rgba(43, 39, 36, .08);
  --shadow-lg: 0 12px 36px rgba(43, 39, 36, .14);

  --font: "OPlus Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 28px 40px;
}

/* ---------- 顶栏 ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 14px; }

.brand-mark {
  position: relative;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
}

.brand-mark .stone {
  position: absolute;
  width: 26px;
  height: 26px;
  border-radius: 50%;
}

.brand-mark .stone-black {
  background: radial-gradient(circle at 34% 30%, #5c5751, #17140f 70%);
  top: 2px; left: 2px;
  box-shadow: var(--shadow-sm);
}

.brand-mark .stone-white {
  background: radial-gradient(circle at 34% 30%, #ffffff, #ddd6ca 72%);
  bottom: 2px; right: 2px;
  box-shadow: var(--shadow-sm), inset 0 0 0 1px rgba(0,0,0,.05);
}

.brand-text h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .02em;
}

.brand-text p {
  margin: 1px 0 0;
  font-size: 12px;
  color: var(--ink-faint);
}

.engine-status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

.engine-status-text { display: flex; flex-direction: column; line-height: 1.3; }
.engine-status-text strong { font-size: 12.5px; font-weight: 600; }
.engine-status-text small { font-size: 11px; color: var(--ink-faint); }

.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex: none;
}

.dot-loading { background: var(--warn); animation: pulse 1.4s ease-in-out infinite; }
.dot-ok { background: var(--accent); }
.dot-off { background: var(--ink-faint); }
.dot-error { background: var(--danger); }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .45; transform: scale(.82); }
}

/* ---------- 布局 ---------- */

.layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
}

.panel { display: flex; flex-direction: column; gap: 16px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}

.card-grow {
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 190px);
}

.card-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--ink-faint);
}

/* ---------- 回合指示 ---------- */

.turn-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  margin-bottom: 16px;
}

.turn-stone {
  width: 26px; height: 26px;
  border-radius: 50%;
  flex: none;
  background: radial-gradient(circle at 34% 30%, #5c5751, #17140f 70%);
  box-shadow: var(--shadow-sm);
}

.turn-stone.is-white {
  background: radial-gradient(circle at 34% 30%, #ffffff, #ddd6ca 72%);
  box-shadow: var(--shadow-sm), inset 0 0 0 1px rgba(0,0,0,.05);
}

.turn-stone.is-thinking { animation: pulse 1.2s ease-in-out infinite; }

.turn-indicator strong { display: block; font-size: 13.5px; font-weight: 600; }
.turn-indicator small { display: block; font-size: 11.5px; color: var(--ink-faint); }

/* ---------- 表单控件 ---------- */

.control-row { margin-bottom: 12px; }

.field { display: block; }

.field > span {
  display: block;
  font-size: 11.5px;
  color: var(--ink-soft);
  margin-bottom: 5px;
  font-weight: 500;
}

select {
  width: 100%;
  padding: 8px 10px;
  font-family: inherit;
  font-size: 13px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='%236d6459' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}

select:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.button-row { display: flex; gap: 8px; margin-top: 16px; }

.btn {
  flex: 1;
  padding: 9px 14px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .14s ease, border-color .14s ease, transform .06s ease;
}

.btn:hover:not(:disabled) { background: var(--surface-sunken); border-color: var(--ink-faint); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .42; cursor: not-allowed; }

.btn-primary {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) { background: var(--accent-ink); border-color: var(--accent-ink); }

.btn-mini {
  flex: none;
  padding: 3px 9px;
  font-size: 11px;
  text-transform: none;
  letter-spacing: 0;
}

/* ---------- 元信息列表 ---------- */

.meta-list { margin: 0; font-size: 12px; }

.meta-list > div {
  display: flex;
  gap: 10px;
  padding: 6px 0;
  border-bottom: 1px solid var(--surface-sunken);
}

.meta-list > div:last-child { border-bottom: none; }

.meta-list dt {
  flex: none;
  width: 42px;
  color: var(--ink-faint);
}

.meta-list dd {
  margin: 0;
  color: var(--ink-soft);
  word-break: break-all;
  font-variant-numeric: tabular-nums;
}

.hint {
  margin: 10px 0 0;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--ink-faint);
}

/* ---------- 棋盘 ---------- */

.board-area { display: flex; flex-direction: column; align-items: center; }

.board-frame {
  position: relative;
  width: 100%;
  max-width: 720px;
  aspect-ratio: 1;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

#board {
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
  touch-action: manipulation;
}

#board.is-locked { cursor: default; }

.board-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(244, 241, 236, .82);
  backdrop-filter: blur(3px);
  animation: fade .22s ease;
}

/* [hidden] 必须优先于上面的 display:grid，否则开局的遮罩会一直盖住棋盘 */
.board-overlay[hidden] { display: none; }

@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

.overlay-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 32px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  min-width: 240px;
}

.overlay-card h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
}

.overlay-card p {
  margin: 0 0 18px;
  font-size: 13px;
  color: var(--ink-soft);
}

.overlay-card .btn { width: 100%; }

.board-caption {
  margin-top: 14px;
  font-size: 12px;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.board-caption .sep { margin: 0 8px; opacity: .5; }

/* ---------- 思考日志 ---------- */

.log {
  flex: 1;
  overflow-y: auto;
  margin: -4px -4px 0;
  padding: 4px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  scrollbar-width: thin;
}

.log-empty {
  margin: 8px 4px;
  font-size: 12px;
  color: var(--ink-faint);
}

.log-entry {
  padding: 9px 11px;
  border-radius: var(--radius-sm);
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border-strong);
  font-size: 12px;
  animation: slideIn .18s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

.log-entry.is-onnx { border-left-color: var(--accent); }
.log-entry.is-tactic { border-left-color: var(--warn); }
.log-entry.is-local { border-left-color: var(--ink-faint); }

.log-entry-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 3px;
}

.log-entry-head strong { font-size: 12.5px; font-weight: 600; }

.log-entry-head span {
  font-size: 10.5px;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  flex: none;
}

.log-entry-coord {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 11.5px;
  color: var(--accent-ink);
}

.log-entry-meta {
  margin-top: 4px;
  font-size: 11px;
  color: var(--ink-faint);
  line-height: 1.55;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1160px) {
  .layout { grid-template-columns: 240px minmax(0, 1fr); }
  .panel-right { grid-column: 1 / -1; }
  .card-grow { max-height: 260px; }
}

@media (max-width: 820px) {
  .app { padding: 16px 16px 32px; }
  .layout { grid-template-columns: minmax(0, 1fr); }
  .topbar { flex-direction: column; align-items: flex-start; gap: 14px; }
  .engine-status { align-self: stretch; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}