/* 在线棋盘页（/play/）：复用 styles.css 的品牌 token，只补这页自己的布局 */
.play-head { padding: 16px 0 10px; background: linear-gradient(180deg, var(--green-soft) 0%, #fff 100%); }
.play-head .crumb { font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.play-head .crumb span { margin: 0 8px; opacity: .5; }
.play-head h1 { font-size: 22px; color: var(--ink); margin: 0; letter-spacing: -0.2px; text-wrap: balance; }
.play-head .standfirst { color: var(--muted); font-size: 14px; margin: 4px 0 0; }

.play-app { padding: 14px 0 32px; }
.mode-seg { display: flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: #fff; }
.mode-seg button { flex: 1; border: 0; background: transparent; color: var(--text); padding: 10px 8px; font: inherit; font-size: 15px; cursor: pointer; }
.mode-seg button[aria-selected="true"] { background: var(--green); color: #fff; font-weight: 600; }
.mode-seg button:focus-visible { outline: 2px solid var(--green); outline-offset: -2px; }

.play-grid { display: grid; grid-template-columns: minmax(0, 1fr) 292px; gap: 24px; align-items: start; }
@media (max-width: 820px) { .play-grid { grid-template-columns: 1fr; } }

.board-col { display: flex; flex-direction: column; align-items: center; }
#board { width: min(100%, calc(100vh - 236px)); height: auto; display: block; border-radius: 6px; box-shadow: 0 4px 18px rgba(40, 26, 8, .2); cursor: pointer; touch-action: manipulation; }
#board.marking { cursor: crosshair; }
.board-hint { font-size: 13px; color: var(--muted); margin-top: 10px; min-height: 20px; }

.panel { display: flex; flex-direction: column; gap: 12px; }
/* 两个模式容器内部也要同样的间距。:not([hidden]) 不能省——display:flex 会盖掉 hidden，
   隐藏中的另一个面板会跟着露出来（g/index.html 踩过同样的坑）。 */
#panel-play:not([hidden]), #panel-sgf:not([hidden]) { display: flex; flex-direction: column; gap: 12px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.label { font-size: 11px; letter-spacing: .09em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.seg { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.seg button { flex: 1; border: 0; border-right: 1px solid var(--line); background: #fff; color: var(--text); padding: 8px 4px; font: inherit; font-size: 14px; cursor: pointer; }
.seg button:last-child { border-right: 0; }
.seg button[aria-pressed="true"] { background: var(--green); color: #fff; font-weight: 600; }
.seg button:disabled { opacity: .45; cursor: not-allowed; }

.status { display: flex; align-items: center; gap: 9px; font-size: 15px; font-weight: 600; min-height: 24px; margin-bottom: 10px; }
.dot { width: 14px; height: 14px; border-radius: 50%; flex: none; border: 1px solid rgba(0,0,0,.35); }
.dot.b { background: #16181A; } .dot.w { background: #FAF8F3; }
.rows { display: grid; grid-template-columns: auto 1fr; gap: 5px 14px; font-size: 13px; margin: 0; }
.rows dt { color: var(--muted); }
.rows dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }

.acts { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.act { border: 1px solid var(--line); background: #fff; color: var(--text); padding: 9px 6px; border-radius: 8px; font: inherit; font-size: 13px; cursor: pointer; text-align: center; }
.act:hover:not(:disabled) { border-color: var(--green); color: var(--green-dark); }
.act:disabled { opacity: .45; cursor: not-allowed; }
.act.primary { background: var(--green); color: #fff; border-color: var(--green); font-weight: 600; }
.act.primary:hover:not(:disabled) { background: var(--green-dark); color: #fff; }
.act.wide { grid-column: 1 / -1; }
.act.file { position: relative; overflow: hidden; }
.act.file input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.act:focus-visible, .act.file:focus-within { outline: 2px solid var(--green); outline-offset: 2px; }

.result { background: var(--green-soft); border-color: var(--green); font-size: 14px; line-height: 1.6; }
.result strong { color: var(--green-dark); }

textarea#sgf-text { width: 100%; min-height: 96px; resize: vertical; border: 1px solid var(--line); border-radius: 8px; padding: 9px 10px; font: 12px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--text); margin-bottom: 8px; }
textarea#sgf-text:focus { outline: 2px solid var(--green); outline-offset: 1px; border-color: transparent; }
.acts-row { display: flex; gap: 8px; }
.acts-row .act { flex: 1; }

.game-meta { font-size: 13px; color: var(--text); display: grid; grid-template-columns: auto 1fr; gap: 3px 12px; margin-bottom: 12px; }
.game-meta span:nth-child(odd) { color: var(--muted); }
.controls { display: flex; gap: 6px; align-items: center; }
.controls button { flex: 1; border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 8px 0; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 6px; font: inherit; font-size: 13px; color: var(--text); }
.controls button svg { width: 14px; height: 14px; fill: currentColor; }
.controls button:hover:not(:disabled) { border-color: var(--green); color: var(--green-dark); }
.controls button:disabled { opacity: .4; cursor: not-allowed; }
.controls button[aria-pressed="true"] { background: var(--green); color: #fff; border-color: var(--green); }
.move-counter { font-size: 13px; color: var(--muted); margin: 10px 0 6px; font-variant-numeric: tabular-nums; }
.move-counter b { color: var(--ink); font-size: 16px; }
.comment { font-size: 14px; line-height: 1.65; color: var(--text); background: var(--paper); border-radius: 8px; padding: 10px 12px; min-height: 44px; white-space: pre-wrap; }
.comment:empty { display: none; }
.tip { font-size: 12px; color: var(--muted); line-height: 1.6; }
.tip a { text-decoration: underline; }

/* 下方说明区：复用 styles.css 的 .section，这里只定义列表与小标题 */
.howto { max-width: 760px; margin: 0 auto; }
.howto .intro { font-size: 16px; color: var(--muted); margin: 0 0 8px; }
.howto h3 { font-size: 18px; color: var(--ink); margin: 28px 0 8px; }
.howto p, .howto li { font-size: 15px; color: var(--text); line-height: 1.75; }
.howto ul { padding-left: 22px; }
.howto .kbd { display: inline-block; font: 12px ui-monospace, Menlo, monospace; background: var(--paper); border: 1px solid var(--line); border-radius: 4px; padding: 0 6px; }