*{
  box-sizing:border-box;
  margin:0;
  padding:0;
  font-family:"Space Grotesk",sans-serif;
}

html,
body{
  width:100%;
  min-height:100%;
  overflow-x:hidden;
  background:radial-gradient(circle at top,#3f2b18 0%,#120c07 48%,#050302 100%);
  color:white;
}

body{
  min-height:100vh;
}

button,
a{
  font-family:inherit;
}

.game-shell{
  min-height:100vh;
  display:flex;
  flex-direction:column;
}

.top-bar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  padding:16px 22px;
  background:rgba(0,0,0,.38);
  border-bottom:1px solid rgba(255,255,255,.1);
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter:blur(14px);
}

.top-left{
  display:flex;
  align-items:center;
  gap:28px;
  flex:1;
}

.title-wrap h1{
  font-size:clamp(1.9rem,3vw,2.8rem);
  letter-spacing:.18em;
}

.subtitle{
  opacity:.74;
  margin-top:6px;
}

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

.top-btn{
  min-height:48px;
  display:flex;
  align-items:center;
  justify-content:center;
  color:white;
  text-decoration:none;
  border:none;
  cursor:pointer;
  padding:12px 20px;
  border-radius:999px;
  font-size:1.05rem;
  font-weight:900;
  background:linear-gradient(180deg,rgba(255,255,255,.18),rgba(255,255,255,.07));
  box-shadow:0 10px 24px rgba(0,0,0,.25);
}

.hud{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
  padding:16px 22px 0;
}

.hud-card{
  padding:14px;
  border-radius:18px;
  background:linear-gradient(180deg,rgba(255,255,255,.12),rgba(255,255,255,.05));
  border:1px solid rgba(255,255,255,.1);
  box-shadow:0 12px 28px rgba(0,0,0,.22);
}

.hud-label{
  opacity:.72;
  margin-bottom:6px;
  font-size:.85rem;
  letter-spacing:.08em;
  text-transform:uppercase;
}

.hud-value{
  font-size:1.3rem;
  font-weight:900;
}

.game-area{
  flex:1;
  display:grid;
  grid-template-columns:minmax(320px,1fr) 310px;
  gap:24px;
  padding:24px 24px 100px;
  align-items:start;
}

.board-panel{
  display:flex;
  justify-content:center;
  align-items:flex-start;
}

.go-board{
  width:min(76vw,690px);
  aspect-ratio:1;
  position:relative;
  border-radius:26px;
  background:
    radial-gradient(circle at 35% 22%,rgba(255,255,255,.2),transparent 28%),
    linear-gradient(135deg,#d8a35b,#aa6f32 55%,#714018);
  border:1px solid rgba(255,255,255,.24);
  box-shadow:
    0 30px 80px rgba(0,0,0,.58),
    inset 0 0 0 14px rgba(70,35,10,.38),
    inset 0 0 35px rgba(255,255,255,.18);
  overflow:hidden;
  touch-action:manipulation;
}

.go-grid{
  position:absolute;
  inset:7.4%;
  display:grid;
  grid-template-columns:repeat(9,1fr);
  grid-template-rows:repeat(9,1fr);
}

.go-grid::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    repeating-linear-gradient(
      to right,
      transparent 0,
      transparent calc(12.5% - 1px),
      rgba(38,20,8,.72) calc(12.5% - 1px),
      rgba(38,20,8,.72) calc(12.5% + 1px)
    ),
    repeating-linear-gradient(
      to bottom,
      transparent 0,
      transparent calc(12.5% - 1px),
      rgba(38,20,8,.72) calc(12.5% - 1px),
      rgba(38,20,8,.72) calc(12.5% + 1px)
    );
  pointer-events:none;
}

.intersection{
  position:relative;
  border:none;
  background:transparent;
  cursor:pointer;
  z-index:2;
  touch-action:manipulation;
}

.intersection:hover::before{
  content:"";
  position:absolute;
  inset:28%;
  border-radius:50%;
  background:rgba(255,236,170,.5);
  box-shadow:0 0 16px rgba(255,236,170,.65);
}

.stone{
  position:absolute;
  inset:13%;
  border-radius:50%;
  z-index:4;
  animation:stoneIn .16s ease both;
}

.stone.black{
  background:radial-gradient(circle at 35% 25%,#5f6369,#111318 56%,#020203);
  box-shadow:
    inset 0 6px 9px rgba(255,255,255,.16),
    inset 0 -8px 15px rgba(0,0,0,.45),
    0 8px 13px rgba(0,0,0,.42);
}

.stone.white{
  background:radial-gradient(circle at 35% 25%,#fff,#d9d6cf 58%,#8e887c);
  box-shadow:
    inset 0 6px 9px rgba(255,255,255,.5),
    inset 0 -8px 15px rgba(0,0,0,.2),
    0 8px 13px rgba(0,0,0,.35);
}

@keyframes stoneIn{
  from{
    transform:scale(.2);
    opacity:.4;
  }
  to{
    transform:scale(1);
    opacity:1;
  }
}

.side-panel{
  display:flex;
  flex-direction:column;
  gap:16px;
  position:sticky;
  top:106px;
}

.action-btn{
  border:none;
  border-radius:20px;
  padding:17px;
  cursor:pointer;
  font-size:1.05rem;
  font-weight:900;
  color:#170d04;
  background:linear-gradient(180deg,#ffe28f,#ffb92f);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.55),
    0 14px 28px rgba(0,0,0,.28);
}

.action-btn.secondary{
  background:linear-gradient(180deg,rgba(255,255,255,.2),rgba(255,255,255,.08));
  color:white;
}

.status-box,
.legend{
  padding:17px;
  border-radius:20px;
  background:linear-gradient(180deg,rgba(255,255,255,.12),rgba(255,255,255,.045));
  border:1px solid rgba(255,255,255,.1);
  line-height:1.55;
  font-weight:800;
  box-shadow:0 12px 28px rgba(0,0,0,.22);
}

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

.mini-stone{
  width:18px;
  height:18px;
  display:inline-block;
  border-radius:50%;
  margin-right:8px;
  vertical-align:-3px;
}

.mini-stone.black{
  background:#050505;
  border:1px solid rgba(255,255,255,.55);
}

.mini-stone.white{
  background:#f5f5f5;
  border:1px solid rgba(0,0,0,.35);
}

.instructions-overlay{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,.78);
  display:flex;
  align-items:center;
  justify-content:center;
  padding:18px;
  z-index:999;
}

.hidden{
  display:none;
}

.instructions-modal{
  width:min(94vw,780px);
  max-height:86vh;
  overflow:auto;
  border-radius:28px;
  background:
    radial-gradient(circle at top,rgba(164,97,42,.28),transparent 40%),
    #160d06;
  border:1px solid rgba(255,255,255,.12);
  padding:28px;
  position:relative;
  box-shadow:0 30px 90px rgba(0,0,0,.6);
}

.instructions-modal h2{
  margin-bottom:20px;
}

.instructions-content{
  display:flex;
  flex-direction:column;
  gap:18px;
  line-height:1.7;
}

.instructions-content ul{
  padding-left:24px;
}

.close-btn{
  position:absolute;
  top:18px;
  right:18px;
  width:42px;
  height:42px;
  border:none;
  border-radius:50%;
  font-weight:900;
  cursor:pointer;
}

@media (max-width:1000px){
  .game-area{
    grid-template-columns:1fr;
  }

  .side-panel{
    position:relative;
    top:auto;
  }

  .go-board{
    width:min(92vw,660px);
  }
}

@media (max-width:680px){
  .top-bar{
    flex-direction:column;
    align-items:flex-start;
  }

  .top-left{
    width:100%;
    gap:16px;
  }

  .title-wrap h1{
    font-size:1.7rem;
  }

  .top-actions,
  .top-btn{
    width:100%;
  }

  .hud{
    grid-template-columns:1fr;
    padding:14px 14px 0;
  }

  .game-area{
    padding:14px 14px 90px;
  }

  .go-board{
    width:94vw;
    border-radius:20px;
  }
}

.intersection{
  display:flex;
  align-items:center;
  justify-content:center;
}

.intersection:hover::before{
  inset:34% !important;
}

.stone{
  inset:16% !important;
}

.go-grid{
  transform:translateY(1px);
}

.go-grid{
  inset:8% !important;
  display:grid !important;
  grid-template-columns:repeat(9,1fr) !important;
  grid-template-rows:repeat(9,1fr) !important;
  transform:none !important;
}

.go-grid::before{
  display:none !important;
}

.intersection{
  position:relative !important;
  display:flex !important;
  align-items:center !important;
  justify-content:center !important;
  overflow:visible !important;
}

.intersection::after{
  content:"";
  position:absolute;
  width:100%;
  height:2px;
  background:rgba(38,20,8,.72);
  top:50%;
  left:50%;
  transform:translate(-50%,-50%);
  pointer-events:none;
  z-index:1;
}

.intersection .grid-v{
  display:none;
}

.intersection::before{
  content:"";
  position:absolute;
  width:2px;
  height:100%;
  background:rgba(38,20,8,.72);
  top:50%;
  left:50%;
  transform:translate(-50%,-50%);
  pointer-events:none;
  z-index:1;
}

.intersection:hover{
  background:radial-gradient(circle,rgba(255,236,170,.45) 0 22%,transparent 24%);
}

.intersection:hover::before{
  inset:auto !important;
  width:2px !important;
  height:100% !important;
  border-radius:0 !important;
  background:rgba(38,20,8,.72) !important;
  box-shadow:none !important;
}

.stone{
  inset:auto !important;
  width:72% !important;
  height:72% !important;
  z-index:5 !important;
}

.intersection:hover::before,
.intersection:hover::after{
  box-shadow:none !important;
}

.intersection:hover{
  background:
    radial-gradient(
      circle,
      rgba(255,236,170,.55) 0 18%,
      rgba(255,236,170,.22) 19% 28%,
      transparent 30%
    ) !important;
}