:root {
    --go-board-size: min(72vh, 760px, 66vw);
    --go-wood: #c99555;
    --go-wood-light: #e2b877;
    --go-line: rgba(45, 27, 13, .75);
}

.go-brand-mark {
    position: relative;
    width: 27px;
    height: 27px;
    border: 1px solid rgba(203, 179, 255, .34);
    border-radius: 7px;
    background:
        linear-gradient(90deg, transparent 31%, rgba(203,179,255,.55) 32% 35%, transparent 36% 64%, rgba(203,179,255,.55) 65% 68%, transparent 69%),
        linear-gradient(transparent 31%, rgba(203,179,255,.55) 32% 35%, transparent 36% 64%, rgba(203,179,255,.55) 65% 68%, transparent 69%);
    box-shadow: 0 0 20px rgba(146, 116, 255, .2);
}
.go-brand-mark i { position: absolute; width: 8px; height: 8px; border-radius: 50%; box-shadow: 0 2px 5px rgba(0,0,0,.35); }
.go-brand-mark i:nth-child(1) { left: 4px; top: 4px; background: #17161a; }
.go-brand-mark i:nth-child(2) { right: 4px; bottom: 4px; background: #f3f0ef; }
.go-brand-mark i:nth-child(3) { left: 50%; top: 50%; width: 3px; height: 3px; transform: translate(-50%,-50%); background: #b9a7ff; box-shadow: 0 0 8px #9b81ff; }

.game-options {
    margin: 18px 0;
    padding: 20px 22px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: rgba(16,16,21,.68);
}
.game-options .eyebrow { display: block; margin-bottom: 12px; }
.size-control { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 9px; }
.size-control button {
    display: grid;
    gap: 5px;
    min-height: 68px;
    padding: 12px 15px;
    border: 1px solid var(--border);
    border-radius: 14px;
    color: var(--muted);
    background: rgba(255,255,255,.025);
    cursor: pointer;
    text-align: left;
    transition: .2s ease;
}
.size-control button:hover { color: var(--text); transform: translateY(-1px); background: rgba(255,255,255,.05); }
.size-control button.is-active { color: var(--text); border-color: rgba(185,167,255,.3); background: var(--accent-soft); box-shadow: inset 0 1px rgba(255,255,255,.05); }
.size-control strong { font-size: 13px; }
.size-control span { color: var(--muted); font-size: 9px; font-weight: 650; letter-spacing: .02em; }

.go-mode-icon { position: relative; border-radius: 12px; background: linear-gradient(145deg,#d6a761,#9d6d35); }
.go-mode-icon::before, .go-mode-icon::after { content:""; position:absolute; inset:9px; background: linear-gradient(90deg, transparent 48%,rgba(54,30,12,.6) 49% 52%,transparent 53%),linear-gradient(transparent 48%,rgba(54,30,12,.6) 49% 52%,transparent 53%); }
.go-mode-icon i { position: absolute; z-index: 1; width: 12px; height: 12px; border-radius: 50%; box-shadow: 0 3px 8px rgba(0,0,0,.42); }
.go-mode-icon i:first-child { left: 10px; top: 10px; background: #111; }
.go-mode-icon i:last-child { right: 10px; bottom: 10px; background: #f2efec; }

.go-game-layout { grid-template-columns: minmax(0,var(--go-board-size)) minmax(310px,380px); }
.go-board-frame {
    width: var(--go-board-size);
    height: var(--go-board-size);
    max-width: 100%;
    aspect-ratio: 1;
    padding: 0;
    overflow: visible;
    border-radius: 19px;
    background: transparent;
}
.go-board-frame .board-glow { inset: -20px; border-radius: 27px; background: rgba(184,131,67,.09); filter: blur(24px); }
.go-board {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    border: 1px solid rgba(255,226,177,.28);
    border-radius: 18px;
    background:
        linear-gradient(100deg,rgba(255,255,255,.06),transparent 25%,rgba(76,40,13,.055) 70%,transparent),
        repeating-linear-gradient(2deg,rgba(76,42,16,.025) 0 1px,transparent 1px 7px),
        linear-gradient(145deg,var(--go-wood-light),var(--go-wood));
    box-shadow: 0 34px 75px rgba(0,0,0,.43), inset 0 1px rgba(255,255,255,.28), inset 0 -20px 40px rgba(86,45,15,.08);
    touch-action: manipulation;
    user-select: none;
}
.go-line { position: absolute; z-index: 1; pointer-events: none; background: var(--go-line); box-shadow: 0 1px rgba(255,255,255,.08); }
.go-line--horizontal { height: 1px; transform: translateY(-.5px); }
.go-line--vertical { width: 1px; transform: translateX(-.5px); }
.go-star { position: absolute; z-index: 2; width: 5px; height: 5px; border-radius: 50%; background: rgba(43,25,12,.78); transform: translate(-50%,-50%); pointer-events: none; }
.go-intersection {
    position: absolute;
    z-index: 4;
    display: grid;
    width: 10.4%;
    aspect-ratio: 1;
    place-items: center;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    transform: translate(-50%,-50%);
    cursor: pointer;
}
.go-board[data-size="13"] .go-intersection { width: 7.15%; }
.go-board[data-size="19"] .go-intersection { width: 4.88%; }
.go-intersection::before {
    content: "";
    width: 88%;
    height: 88%;
    border-radius: 50%;
    opacity: 0;
    transform: scale(.64);
    transition: opacity .13s ease, transform .18s cubic-bezier(.2,.8,.2,1), filter .2s ease;
}
.go-intersection.has-stone::before { opacity: 1; transform: scale(1); }
.go-intersection.stone-black::before {
    background: radial-gradient(circle at 34% 28%,#4c4b50 0%,#18171a 35%,#050507 76%,#000 100%);
    box-shadow: 0 5px 9px rgba(38,19,8,.55), inset 0 1px 2px rgba(255,255,255,.22);
}
.go-intersection.stone-white::before {
    background: radial-gradient(circle at 34% 25%,#fff 0%,#efedeb 48%,#c8c4c0 86%,#aaa39d 100%);
    box-shadow: 0 5px 9px rgba(38,19,8,.4), inset 0 1px 2px rgba(255,255,255,.95);
}
.go-intersection.can-play:hover::before, .go-intersection.can-play:focus-visible::before { opacity: .45; transform: scale(.88); background: radial-gradient(circle at 35% 30%,#49484c,#111 72%); box-shadow: 0 4px 10px rgba(0,0,0,.4); }
.go-intersection.preview-white:hover::before { background: radial-gradient(circle at 35% 30%,#fff,#d2ceca 72%); }
.go-intersection.is-last::after {
    content: "";
    position: absolute;
    width: 23%;
    height: 23%;
    border: 2px solid #b69eff;
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(168,142,255,.72);
}
.go-intersection.is-captured { animation: go-capture .36s ease both; }
.go-intersection.is-dead::before { opacity: .36; filter: grayscale(.6); transform: scale(.86); }
.go-intersection.is-dead::after {
    content: "×";
    position: absolute;
    z-index: 2;
    color: #ff7280;
    font-size: clamp(12px,2vw,24px);
    font-weight: 800;
    text-shadow: 0 2px 6px rgba(0,0,0,.65);
}
.go-intersection.is-disabled { cursor: default; }
.go-history-stone { flex: 0 0 13px; width: 13px; height: 13px; border-radius: 50%; }
.go-history-stone.is-black { background: #09090b; box-shadow: inset 0 1px rgba(255,255,255,.2),0 2px 4px #000; }
.go-history-stone.is-white { background: #f2efec; box-shadow: inset 0 1px #fff,0 2px 4px rgba(0,0,0,.45); }
.move-row { grid-template-columns: 14px minmax(0,1fr) auto; }

.go-captures { display: grid; grid-template-columns: auto auto; gap: 2px 8px; align-items: center; min-width: 74px; }
.go-captures span { grid-row: 1/3; color: var(--muted-2); font-size: 7px; font-weight: 850; letter-spacing: .12em; writing-mode: vertical-rl; }
.go-captures strong { font-size: 22px; line-height: 1; }

.score-section { border-color: rgba(205,175,118,.18); background: rgba(194,142,72,.04); }
.score-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.score-grid > div { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 8px; padding: 11px; border: 1px solid var(--border); border-radius: 12px; background: rgba(255,255,255,.025); }
.score-grid span { color: var(--muted); font-size: 10px; }
.score-grid strong { font-size: 15px; }
.score-stone { width: 13px; height: 13px; border-radius: 50%; }
.score-stone--black { background: #09090b; box-shadow: inset 0 1px rgba(255,255,255,.22),0 2px 4px #000; }
.score-stone--white { background: #f3f1ee; box-shadow: inset 0 1px #fff,0 2px 4px rgba(0,0,0,.45); }
.score-help { margin: 11px 0 0; color: var(--muted); font-size: 9px; line-height: 1.55; }
.go-panel-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.go-panel-actions .button--danger:last-child { grid-column: 1/-1; }

.go-result-symbol { position: relative; border-color: rgba(208,173,112,.2); background: linear-gradient(145deg,#d8aa65,#9e6a32); }
.go-result-symbol::before, .go-result-symbol::after { content:""; position:absolute; width:24px; height:24px; border-radius:50%; top:50%; transform:translateY(-50%); box-shadow:0 5px 10px rgba(0,0,0,.38); }
.go-result-symbol::before { left:15px; background:#0b0b0d; }
.go-result-symbol::after { right:15px; background:#f2efec; }
.go-result-symbol i { position:absolute; z-index:2; left:50%; top:50%; width:8px; height:8px; border-radius:50%; background:#a78eff; transform:translate(-50%,-50%); box-shadow:0 0 10px #8e71ff; }

@keyframes go-capture { 0%{opacity:1;transform:translate(-50%,-50%) scale(1)} 100%{opacity:0;transform:translate(-50%,-50%) scale(.3)} }

@media (max-width: 1100px) {
    :root { --go-board-size: min(68vh,660px,62vw); }
    .go-game-layout { grid-template-columns: minmax(0,var(--go-board-size)) 320px; }
}
@media (max-width: 860px) {
    :root { --go-board-size: min(calc(100vw - 38px),720px); }
    .go-game-layout { grid-template-columns: 1fr; }
    .go-board-frame { margin-inline: auto; }
}
@media (max-width: 620px) {
    .game-options { padding: 16px; }
    .size-control { grid-template-columns: 1fr; }
    .size-control button { min-height: 54px; }
    .go-intersection.is-dead::after { font-size: 14px; }
}
@media (max-width: 420px) {
    :root { --go-board-size: calc(100vw - 24px); }
    .go-board-frame, .go-board { border-radius: 12px; }
    .go-panel-actions { grid-template-columns: 1fr; }
    .go-panel-actions .button--danger:last-child { grid-column: auto; }
}
@media (prefers-reduced-motion: reduce) {
    .go-intersection { transition: none; }
}