:root{
  --page-bg:#f3f7f8;
  --paper:#fff;
  --ink:#25333d;
  --muted:#667783;
  --line:#d9e5e8;
  --teal:#249cac;
  --teal-dark:#187887;
  --purple:#6f22ed;
  --black:#16242d;
  --black-dark:#071015;
  --white:#fbf8ef;
  --white-dark:#c9c1b2;
  --green-1:#1f8f76;
  --green-2:#14705f;
  --green-3:#0d584c;
}
*{box-sizing:border-box}
html{min-height:100%}
body{
  min-height:100vh;
  margin:0;
  padding:8px 10px;
  color:var(--ink);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:radial-gradient(circle at 10% 10%,rgba(111,34,237,.055),transparent 25%),radial-gradient(circle at 90% 85%,rgba(35,150,165,.07),transparent 28%),var(--page-bg)
}
button{font:inherit}
button:focus-visible{outline:3px solid rgba(111,34,237,.35);outline-offset:2px}
.game-app{
  width:min(100%,1140px);
  margin:0 auto;
  padding:8px;
  border:1px solid #e0eaed;
  border-radius:22px;
  background:rgba(255,255,255,.9);
  box-shadow:0 18px 54px rgba(34,64,75,.10)
}
.workspace{
  display:grid;
  grid-template-columns:minmax(0,min(700px,calc(100vh - 44px))) minmax(310px,360px);
  justify-content:center;
  align-items:start;
  gap:10px
}
.game-column{width:100%;max-width:min(700px,calc(100vh - 44px));min-width:0}
.control-column{min-width:0;display:grid;gap:7px}
.control-panel,.status-card,.meti-panel,.player-colors{
  border:1px solid var(--line);
  border-radius:18px;
  background:rgba(255,255,255,.92)
}
.control-panel{padding:8px;display:grid;gap:7px}
.setting-block{padding:7px;border:1px solid var(--line);border-radius:13px;background:#fbfdfe}
.setting-label,.small-label{display:block;color:#526975;font-size:.68rem;font-weight:850}
.setting-label{margin-bottom:5px}
.hint-setting-block{padding-top:6px;padding-bottom:6px}
.hint-setting-row{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:38px}
.hint-setting-copy{min-width:0}
.hint-setting-copy .setting-label{margin-bottom:1px}
.hint-setting-copy small{display:block;color:#7b8c95;font-size:.60rem;line-height:1.2}
.switch-control{position:relative;display:inline-flex;align-items:center;flex:0 0 auto;cursor:pointer}
.switch-control input{position:absolute;opacity:0;pointer-events:none}
.switch-track{width:42px;height:24px;padding:3px;display:block;border-radius:999px;background:#dbe5e8;box-shadow:inset 0 0 0 1px rgba(55,83,94,.08);transition:.18s ease}
.switch-thumb{width:18px;height:18px;display:block;border-radius:50%;background:#fff;box-shadow:0 2px 6px rgba(31,58,67,.22);transition:.18s ease}
.switch-control input:checked + .switch-track{background:linear-gradient(135deg,#2aadb9,#168999)}
.switch-control input:checked + .switch-track .switch-thumb{transform:translateX(18px)}
.switch-control input:focus-visible + .switch-track{outline:3px solid rgba(111,34,237,.28);outline-offset:2px}
.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.mode-button,.difficulty-button{
  border:1px solid #d5e1e5;
  color:#334754;
  background:#f7fafb;
  cursor:pointer;
  transition:.15s ease
}
.mode-button{min-height:38px;padding:6px 9px;border-radius:12px;font-weight:850}
.mode-button.active{
  color:#fff;
  border-color:var(--purple);
  background:linear-gradient(135deg,#7e2cf3,#6518df);
  box-shadow:0 6px 14px rgba(111,34,237,.16)
}
.difficulty-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.difficulty-button{
  min-height:56px;
  padding:6px 4px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  border-radius:12px;
  text-align:center
}
.difficulty-button strong{font-size:.69rem;line-height:1.15}
.difficulty-button.active{border-color:#9149ff;background:#fbf8ff;box-shadow:0 0 0 2px rgba(111,34,237,.07),0 5px 12px rgba(111,34,237,.09)}
.level-dot{width:20px;height:20px;flex:0 0 auto;border:3px solid rgba(255,255,255,.82);border-radius:50%;box-shadow:0 4px 10px rgba(27,52,66,.14)}
.easy-dot{background:#77db54}.medium-dot{background:#ffb43a}.hard-dot{background:#ff5c68}
.new-game-button{
  min-height:42px;
  border:0;
  border-radius:12px;
  color:#fff;
  background:linear-gradient(135deg,#29a5b3,#17889a);
  box-shadow:0 7px 16px rgba(35,150,165,.16);
  cursor:pointer;
  font-weight:900
}
.mode-button:active,.difficulty-button:active,.new-game-button:active,.primary-button:active,.secondary-button:active{transform:scale(.98)}
.status-card{padding:8px 10px;display:grid;gap:7px}
.turn-info{display:flex;align-items:center;gap:9px}
.turn-info strong{display:block;margin-top:2px;font-size:.88rem}
.turn-piece,.mini-piece,.reversi-piece{
  border-radius:50%;
  box-shadow:inset -6px -8px 10px rgba(0,0,0,.23),inset 5px 5px 8px rgba(255,255,255,.30),0 4px 8px rgba(25,45,50,.18)
}
.turn-piece{width:34px;height:34px;flex:0 0 auto;border:3px solid rgba(255,255,255,.82)}
.mini-piece{display:inline-block;width:17px;height:17px;margin-right:6px;vertical-align:-4px}
.white-piece{border:1px solid rgba(84,80,69,.22);background:radial-gradient(circle at 34% 27%,#fff 0,var(--white) 52%,#ded7c9 78%,var(--white-dark) 100%)}
.black-piece{background:radial-gradient(circle at 34% 27%,#5d6972 0,#26343d 28%,var(--black) 62%,var(--black-dark) 100%)}
.move-info{display:flex;align-items:center;gap:7px;padding-top:7px;border-top:1px solid var(--line);color:#6b7b84}
.move-badge{width:25px;height:25px;display:grid;place-items:center;border-radius:50%;color:#fff;background:var(--teal);font-size:.65rem;box-shadow:0 4px 9px rgba(35,150,165,.16)}
.move-info strong{font-size:.68rem}
.meti-panel{min-height:98px;padding:8px 10px;display:grid;grid-template-columns:72px minmax(0,1fr);align-items:center;gap:8px}
.meti-image-wrap{display:flex;align-items:center;justify-content:center;min-height:72px}
.meti-image{display:block;width:100%;max-width:68px;max-height:78px;object-fit:contain;filter:drop-shadow(0 8px 14px rgba(91,50,143,.14))}
.meti-bubble{position:relative;min-width:0;padding:10px 12px;border-radius:14px;color:#fff;background:#2f377f}
.meti-bubble:before{content:"";position:absolute;left:-7px;top:36%;width:14px;height:14px;background:#2f377f;transform:rotate(45deg)}
.meti-bubble strong{display:block;margin-bottom:2px;font-size:.81rem}
.meti-bubble p{margin:0;font-size:.66rem;line-height:1.35}
.player-colors{padding:7px;display:grid;grid-template-columns:1fr 1fr;gap:6px}
.player-color-card{padding:7px 9px;border:1px solid #dce7ea;border-radius:13px;background:#fbfdfe}
.player-color-card>span{display:block;margin-bottom:3px;color:#5c7180;font-size:.68rem}
.player-color-card strong{display:block;font-size:.78rem}
.player-color-card b{display:block;margin-top:4px;color:#79909a;font-size:.63rem}
.board-frame{
  width:100%;
  padding:clamp(13px,1.6vh,19px);
  border-radius:27px;
  background:linear-gradient(145deg,rgba(255,255,255,.11),transparent 34%),linear-gradient(135deg,#214d48,#123a36);
  box-shadow:inset 0 -9px 0 rgba(4,24,31,.25),inset 0 2px 0 rgba(255,255,255,.16),0 20px 38px rgba(33,65,73,.19)
}
.reversi-board{
  width:100%;
  aspect-ratio:1;
  display:grid;
  grid-template-columns:repeat(8,1fr);
  grid-template-rows:repeat(8,1fr);
  overflow:hidden;
  border:3px solid rgba(255,255,255,.2);
  border-radius:15px;
  background:#15715f;
  box-shadow:inset 0 0 0 1px rgba(2,39,32,.26),0 2px 0 rgba(255,255,255,.13)
}
.board-cell{
  position:relative;
  min-width:0;
  min-height:0;
  padding:0;
  border:0;
  background:linear-gradient(145deg,var(--green-1),var(--green-2));
  border-right:1px solid rgba(0,0,0,.19);
  border-bottom:1px solid rgba(0,0,0,.19);
  cursor:default
}
.board-cell:nth-child(odd){background:linear-gradient(145deg,#23977c,#17755f)}
.board-cell.legal{cursor:pointer}
.board-cell.legal:hover{box-shadow:inset 0 0 0 4px rgba(255,255,255,.18),inset 0 0 24px rgba(255,255,255,.08)}
.board-cell.legal:after{
  content:"";
  position:absolute;
  left:50%;
  top:50%;
  width:18%;
  aspect-ratio:1;
  border-radius:50%;
  background:#70d8df;
  box-shadow:0 0 0 6px rgba(112,216,223,.13),0 3px 8px rgba(8,58,54,.12);
  transform:translate(-50%,-50%)
}
.reversi-board.hints-off .board-cell.legal:after{display:none}
.reversi-board.hints-off .board-cell.legal:hover{box-shadow:none}
.board-cell.last-move{box-shadow:inset 0 0 0 4px rgba(247,194,78,.58)}
.reversi-piece{
  position:absolute;
  z-index:2;
  inset:11%;
  pointer-events:none;
  transform-style:preserve-3d
}
.reversi-piece.black{background:radial-gradient(circle at 34% 26%,#69747c 0,#293740 30%,#152229 66%,#070d11 100%);border:2px solid rgba(255,255,255,.09)}
.reversi-piece.white{background:radial-gradient(circle at 34% 26%,#fff 0,#faf7ed 43%,#e1dbce 76%,#bdb5a7 100%);border:2px solid rgba(76,70,58,.2)}
.reversi-piece.just-placed{animation:piecePop .22s ease-out both}
.reversi-piece.just-flipped{animation:pieceFlip .34s ease-in-out both}
@keyframes piecePop{0%{transform:scale(.3);opacity:.3}75%{transform:scale(1.08)}100%{transform:scale(1);opacity:1}}
@keyframes pieceFlip{0%{transform:scaleX(1)}48%{transform:scaleX(.08)}52%{transform:scaleX(.08)}100%{transform:scaleX(1)}}
.modal{position:fixed;inset:0;z-index:30;display:grid;place-items:center;padding:20px;visibility:hidden;opacity:0;transition:.18s ease}
.modal.open{visibility:visible;opacity:1}
.modal-backdrop{position:absolute;inset:0;background:rgba(26,30,35,.56);backdrop-filter:blur(6px)}
.modal-card{position:relative;z-index:1;width:min(100%,470px);max-height:min(88vh,720px);overflow:auto;padding:24px;border:1px solid rgba(255,255,255,.85);border-radius:24px;background:#fff;box-shadow:0 24px 70px rgba(31,45,53,.24)}
.result-card{text-align:center}
.result-meti-image{width:132px;height:116px;object-fit:contain;margin:0 auto 6px;display:block}
.result-eyebrow{margin:0 0 5px;color:var(--purple);font-size:.68rem;font-weight:900;letter-spacing:.12em}
.result-card h2{margin:0 0 8px;font-size:1.65rem}
.result-card>p:not(.result-eyebrow){color:#637480}
.result-score{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:13px 0}
.result-score span{padding:9px;border-radius:12px;background:#f3f7f8;color:#455c67;font-size:.78rem;font-weight:850}
.result-meti-text{margin-top:10px;padding:10px 12px;border-radius:13px;background:#f5f2ff;color:#3a3d79!important;font-size:.82rem;line-height:1.45}
.modal-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:18px}
.primary-button,.secondary-button{min-height:45px;padding:9px 13px;border-radius:12px;cursor:pointer;font-weight:850}
.primary-button{border:0;color:#fff;background:var(--purple)}
.secondary-button{border:1px solid var(--line);color:var(--ink);background:#f8fafb}
.is-hidden{display:none!important}
@media(max-width:900px){
  .workspace{display:flex!important;flex-direction:column!important;gap:10px!important}
  .control-column{display:contents!important}
  .control-panel{order:1;width:100%}
  .game-column{order:2;width:100%;max-width:none}
  .status-card{display:none!important}
  .meti-panel{order:4;width:100%}
  .player-colors{order:5;width:100%}
  .board-frame{padding:17px;border-radius:24px}
}
@media(max-width:680px){
  body{padding:7px}
  .game-app{padding:9px;border-radius:20px}
  .meti-panel{grid-template-columns:92px minmax(0,1fr);min-height:126px;padding:12px}
  .meti-image{max-width:86px;max-height:96px}
  .meti-image-wrap{min-height:90px}
}
@media(max-width:440px){
  .mode-grid,.player-colors,.modal-actions{grid-template-columns:1fr}
  .difficulty-grid{grid-template-columns:1fr}
  .difficulty-button{min-height:42px;flex-direction:row;justify-content:flex-start;padding:7px 10px;text-align:left}
  .difficulty-button strong{font-size:.78rem}
  .hint-setting-row{min-height:36px}
  .meti-panel{grid-template-columns:76px minmax(0,1fr);gap:8px}
  .meti-bubble{padding:12px}
  .meti-bubble strong{font-size:.83rem}
  .meti-bubble p{font-size:.69rem}
  .board-frame{padding:12px}
}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}