/* ============================================
   NEO OTHELLO — Futuristic UI
   ============================================ */
:root{
  --bg-0:#070912;
  --bg-1:#0d1024;
  --bg-2:#141a3a;
  --primary:#7c4dff;
  --primary-2:#b388ff;
  --accent:#00e5ff;
  --accent-2:#18ffd5;
  --pink:#ff4d94;
  --gold:#ffd54f;
  --success:#3ddc84;
  --danger:#ff5b6e;
  --warning:#ffb020;
  --light:#eaf0ff;
  --muted:#8b93b8;
  --glass:rgba(20,26,58,0.55);
  --glass-brd:rgba(140,160,255,0.14);
  --shadow:0 20px 60px rgba(0,0,0,.55);
  --radius:20px;
  --board-green-a:#0f9d76;
  --board-green-b:#0a7a5c;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:'Poppins','M PLUS Rounded 1c',sans-serif;
  background:var(--bg-0);
  color:var(--light);
  min-height:100vh;
  overflow-x:hidden;
  position:relative;
}

/* --- 背景装飾 --- */
.bg-grid{
  position:fixed;inset:0;z-index:-3;
  background:
    linear-gradient(rgba(124,77,255,.05) 1px,transparent 1px) 0 0/48px 48px,
    linear-gradient(90deg,rgba(0,229,255,.05) 1px,transparent 1px) 0 0/48px 48px,
    radial-gradient(circle at 50% 0%, #1a1f4a 0%, var(--bg-0) 60%);
  mask-image:radial-gradient(circle at 50% 30%, #000 40%, transparent 90%);
}
.bg-orbs span{
  position:fixed;border-radius:50%;filter:blur(80px);opacity:.5;z-index:-2;
  animation:drift 22s ease-in-out infinite;
}
.bg-orbs span:nth-child(1){width:420px;height:420px;background:var(--primary);top:-120px;left:-100px}
.bg-orbs span:nth-child(2){width:380px;height:380px;background:var(--accent);bottom:-120px;right:-80px;animation-delay:-7s}
.bg-orbs span:nth-child(3){width:300px;height:300px;background:var(--pink);top:40%;left:60%;animation-delay:-14s;opacity:.35}
@keyframes drift{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(40px,-40px) scale(1.15)}}
.particles{position:fixed;inset:0;pointer-events:none;z-index:-1}
.particle{position:absolute;background:rgba(255,255,255,.6);border-radius:50%;animation:rise linear infinite}
@keyframes rise{0%{transform:translateY(0) translateX(0);opacity:0}10%{opacity:.8}100%{transform:translateY(-110vh) translateX(60px);opacity:0}}

/* --- ガラス --- */
.glass{
  background:var(--glass);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border:1px solid var(--glass-brd);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

/* --- ビュー切替 --- */
.view{display:none;animation:fadeUp .5s ease}
.view.active{display:block}
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}

/* --- ローディング --- */
#loading{position:fixed;inset:0;z-index:2000;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:22px;background:rgba(7,9,18,.92);backdrop-filter:blur(10px)}
.loader-disc{width:72px;height:72px;border-radius:50%;
  background:conic-gradient(from 0deg,var(--accent),var(--primary),var(--pink),var(--accent));
  animation:spin 1.1s linear infinite;display:flex;align-items:center;justify-content:center}
.loader-disc.sm{width:44px;height:44px}
.disc-inner{width:60%;height:60%;border-radius:50%;background:var(--bg-0)}
@keyframes spin{to{transform:rotate(360deg)}}
#loading p{color:var(--muted);letter-spacing:2px;font-family:'Orbitron',sans-serif}

/* --- ボタン --- */
.btn{border:none;border-radius:12px;padding:12px 20px;font-size:15px;font-weight:600;
  cursor:pointer;transition:all .25s;display:inline-flex;align-items:center;gap:8px;
  font-family:inherit;color:#fff;white-space:nowrap}
.btn.sm{padding:9px 14px;font-size:14px}
.btn-block{width:100%;justify-content:center}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));
  box-shadow:0 8px 22px rgba(124,77,255,.45)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(124,77,255,.65)}
.btn-danger{background:linear-gradient(135deg,var(--danger),#ff8b8b);box-shadow:0 8px 22px rgba(255,91,110,.4)}
.btn-danger:hover{transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.06);border:1px solid var(--glass-brd)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none!important;box-shadow:none}
.icon-btn{width:42px;height:42px;border-radius:12px;border:1px solid var(--glass-brd);
  background:rgba(255,255,255,.06);color:var(--light);cursor:pointer;position:relative;transition:.2s}
.icon-btn:hover{background:rgba(255,255,255,.14)}
.badge{position:absolute;top:-6px;right:-6px;background:var(--pink);color:#fff;font-size:11px;
  min-width:18px;height:18px;border-radius:9px;display:flex;align-items:center;justify-content:center;padding:0 4px}

/* --- ロゴ --- */
.logo-mark{width:64px;height:64px;margin:0 auto 8px;border-radius:20px;font-size:32px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  box-shadow:0 8px 30px rgba(124,77,255,.5)}
.logo-mark.sm{width:38px;height:38px;font-size:18px;border-radius:11px;margin:0}
.brand{font-family:'Orbitron',sans-serif;font-size:2rem;font-weight:900;letter-spacing:3px;
  background:linear-gradient(90deg,var(--accent),var(--primary-2),var(--pink));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;text-align:center}
.brand-sub{text-align:center;color:var(--muted);letter-spacing:4px;font-size:.72rem;margin-bottom:22px}

/* ==================== 認証 ==================== */
#auth-view{min-height:100vh;display:none;place-items:center;padding:24px}
#auth-view.active{display:grid}
.auth-card{width:100%;max-width:420px;padding:38px 34px}
.tabs{display:flex;gap:8px;background:rgba(255,255,255,.05);border-radius:12px;padding:5px;margin-bottom:22px}
.tab{flex:1;padding:11px;border:none;border-radius:9px;background:transparent;color:var(--muted);
  font-weight:600;cursor:pointer;font-family:inherit;transition:.25s}
.tab.active{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 4px 14px rgba(124,77,255,.4)}
.auth-form{display:none;flex-direction:column;gap:14px}
.auth-form.active{display:flex}
.field{display:flex;align-items:center;gap:12px;background:rgba(255,255,255,.06);
  border:1px solid transparent;border-radius:12px;padding:0 16px;transition:.25s}
.field:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px rgba(124,77,255,.18)}
.field i{color:var(--muted)}
.field input{flex:1;background:transparent;border:none;outline:none;color:#fff;padding:15px 0;font-size:15px;font-family:inherit}
.secure-note{margin-top:20px;text-align:center;color:var(--muted);font-size:.78rem}
.secure-note i{color:var(--success)}

/* ==================== トップバー ==================== */
.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 22px;
  margin:16px;position:sticky;top:16px;z-index:50}
.topbar-left,.topbar-right{display:flex;align-items:center;gap:14px}
.topbar-brand{font-family:'Orbitron',sans-serif;font-weight:700;letter-spacing:2px;font-size:1rem}
.user-chip{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.06);
  padding:6px 14px 6px 6px;border-radius:40px;border:1px solid var(--glass-brd)}
.avatar{width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:18px;color:#fff;background:linear-gradient(135deg,var(--pink),var(--primary));text-transform:uppercase}
.user-meta{display:flex;flex-direction:column;line-height:1.2}
.u-name{font-weight:600;font-size:14px}
.u-rating{font-size:12px;color:var(--gold)}

/* ==================== ロビー ==================== */
.lobby-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding:0 16px 40px;max-width:1200px;margin:0 auto}
.span-2{grid-column:span 2}
.panel{padding:22px}
.panel-title{font-size:1.05rem;margin-bottom:16px;display:flex;align-items:center;gap:10px;font-weight:700}
.panel-title i{color:var(--accent)}

.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.mode-card{text-align:left;padding:20px;border-radius:16px;border:1px solid var(--glass-brd);
  background:rgba(255,255,255,.04);cursor:pointer;transition:.28s;color:var(--light);font-family:inherit}
.mode-card:hover{transform:translateY(-4px);border-color:var(--primary);
  background:rgba(124,77,255,.12);box-shadow:0 14px 34px rgba(124,77,255,.25)}
.mode-icon{width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  font-size:24px;margin-bottom:12px;color:#fff}
.mode-icon.bot{background:linear-gradient(135deg,#00e5ff,#18ffd5)}
.mode-icon.random{background:linear-gradient(135deg,#ff4d94,#ff8b8b)}
.mode-icon.room{background:linear-gradient(135deg,#7c4dff,#b388ff)}
.mode-icon.join{background:linear-gradient(135deg,#ffb020,#ffd54f)}
.mode-card h3{font-size:1.05rem;margin-bottom:5px}
.mode-card p{color:var(--muted);font-size:.82rem;line-height:1.4}

.waiting-box{margin-top:18px;padding:16px 18px;border-radius:14px;display:flex;align-items:center;gap:16px;
  background:rgba(0,229,255,.08);border:1px solid rgba(0,229,255,.25);animation:pulseGlow 2s infinite}
@keyframes pulseGlow{0%,100%{box-shadow:0 0 0 rgba(0,229,255,.2)}50%{box-shadow:0 0 26px rgba(0,229,255,.5)}}
.waiting-box>div{flex:1}
.waiting-title{font-weight:600}
.room-code-line{color:var(--accent);font-family:'Orbitron',sans-serif;font-size:1.3rem;letter-spacing:3px;margin-top:4px}

/* 戦績 */
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.stat{text-align:center;padding:16px 8px;border-radius:14px;background:rgba(255,255,255,.04);border:1px solid var(--glass-brd)}
.stat-num{display:block;font-size:1.8rem;font-weight:800;font-family:'Orbitron',sans-serif;
  background:linear-gradient(90deg,var(--accent),var(--primary-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat-lbl{color:var(--muted);font-size:.78rem}

/* ランキング */
.rank-list{list-style:none;display:flex;flex-direction:column;gap:8px;max-height:280px;overflow-y:auto}
.rank-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:11px;background:rgba(255,255,255,.04)}
.rank-pos{width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:13px;background:rgba(255,255,255,.1)}
.rank-pos.g1{background:linear-gradient(135deg,#ffd54f,#ffb020);color:#000}
.rank-pos.g2{background:linear-gradient(135deg,#e0e0e0,#9e9e9e);color:#000}
.rank-pos.g3{background:linear-gradient(135deg,#cd7f32,#a05a2c)}
.rank-name{flex:1;font-weight:600;font-size:.9rem}
.rank-val{color:var(--gold);font-weight:700;font-size:.85rem}

/* フレンド */
.friend-add{display:flex;gap:8px;margin-bottom:14px}
.friend-add input{flex:1;background:rgba(255,255,255,.06);border:1px solid var(--glass-brd);
  border-radius:11px;padding:11px 14px;color:#fff;outline:none;font-family:inherit}
.friend-list,.online-list{list-style:none;display:flex;flex-direction:column;gap:8px;max-height:260px;overflow-y:auto}
.friend-list li,.online-list li{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:11px;background:rgba(255,255,255,.04)}
.dot{width:9px;height:9px;border-radius:50%;background:var(--muted);flex-shrink:0}
.dot.on{background:var(--success);box-shadow:0 0 8px var(--success)}
.fl-name{flex:1;font-size:.9rem;font-weight:500}
.fl-actions{display:flex;gap:6px}
.mini-btn{border:none;border-radius:8px;padding:6px 10px;font-size:12px;cursor:pointer;color:#fff;font-family:inherit}
.mini-btn.msg{background:var(--accent);color:#042}
.mini-btn.inv{background:var(--primary)}
.mini-btn.rm{background:var(--danger)}
.mini-btn.ok{background:var(--success);color:#042}
.req-item{display:flex;align-items:center;gap:8px;padding:9px 12px;border-radius:11px;
  background:rgba(255,209,79,.1);border:1px solid rgba(255,209,79,.3);margin-bottom:8px}
.req-item .fl-name{font-size:.85rem}
.empty-hint{color:var(--muted);font-size:.82rem;text-align:center;padding:14px}

/* ==================== ゲーム ==================== */
.game-layout{display:grid;grid-template-columns:1fr 340px;gap:16px;padding:0 16px 30px;max-width:1180px;margin:0 auto}
.board-side{display:flex;flex-direction:column;gap:16px}
.players-bar{display:flex;align-items:center;justify-content:space-between;gap:12px}
.pcard{flex:1;display:flex;align-items:center;gap:12px;padding:14px 18px;border-radius:16px;
  background:var(--glass);border:1px solid var(--glass-brd);backdrop-filter:blur(12px);transition:.3s}
.pcard.white{flex-direction:row-reverse;text-align:right}
.pcard.active{border-color:var(--accent);box-shadow:0 0 24px rgba(0,229,255,.4);transform:scale(1.03)}
.pcard .disc{width:34px;height:34px;flex-shrink:0}
.pcard>div:not(.disc){display:flex;flex-direction:column}
.pname{font-weight:600;font-size:.95rem}
.pcount{font-size:1.5rem;font-weight:800;font-family:'Orbitron',sans-serif}
.disc{border-radius:50%}
.disc.black{background:radial-gradient(circle at 32% 28%,#5a5a6e,#0a0a14);box-shadow:inset 0 -3px 6px rgba(0,0,0,.6)}
.disc.white{background:radial-gradient(circle at 32% 28%,#ffffff,#c2c6d6);box-shadow:inset 0 -3px 6px rgba(0,0,0,.25)}
.vs-turn{font-family:'Orbitron',sans-serif;font-size:.8rem;text-align:center;color:var(--accent);
  padding:6px 12px;border-radius:10px;background:rgba(0,229,255,.1);min-width:96px}

.board-frame{padding:14px;border-radius:22px;background:var(--glass);border:1px solid var(--glass-brd);
  backdrop-filter:blur(12px);box-shadow:var(--shadow)}
.board-coords-top{display:grid;grid-template-columns:repeat(8,1fr);gap:5px;padding-left:22px;margin-bottom:5px}
.board-coords-top span{text-align:center;color:var(--muted);font-size:.72rem;font-family:'Orbitron',sans-serif}
.board-wrap{display:flex;gap:6px}
.board-coords-left{display:grid;grid-template-rows:repeat(8,1fr);gap:5px;width:16px}
.board-coords-left span{display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:.72rem;font-family:'Orbitron',sans-serif}
.board{flex:1;display:grid;grid-template-columns:repeat(8,1fr);gap:5px;
  background:linear-gradient(145deg,var(--board-green-a),var(--board-green-b));
  padding:8px;border-radius:14px;aspect-ratio:1;
  box-shadow:inset 0 2px 10px rgba(0,0,0,.4),0 0 30px rgba(15,157,118,.3)}
.cell{position:relative;background:rgba(255,255,255,.04);border-radius:7px;cursor:default;
  display:flex;align-items:center;justify-content:center;transition:background .2s;
  box-shadow:inset 0 1px 3px rgba(0,0,0,.25)}
.cell.playable{cursor:pointer}
.cell.playable:hover{background:rgba(255,255,255,.14)}
.cell .stone{width:82%;height:82%;border-radius:50%;animation:drop .35s cubic-bezier(.2,.9,.3,1.2)}
.cell .stone.black{background:radial-gradient(circle at 32% 28%,#5a5a6e,#0a0a14);box-shadow:0 2px 6px rgba(0,0,0,.5)}
.cell .stone.white{background:radial-gradient(circle at 32% 28%,#ffffff,#c2c6d6);box-shadow:0 2px 6px rgba(0,0,0,.3)}
@keyframes drop{0%{transform:scale(0) rotateY(180deg);opacity:0}100%{transform:scale(1) rotateY(0);opacity:1}}
.cell .hint{width:30%;height:30%;border-radius:50%;background:rgba(0,229,255,.55);
  box-shadow:0 0 12px rgba(0,229,255,.8);animation:hintPulse 1.4s infinite}
@keyframes hintPulse{0%,100%{transform:scale(.8);opacity:.5}50%{transform:scale(1.1);opacity:1}}
.cell.last{box-shadow:inset 0 0 0 2px var(--gold),inset 0 1px 3px rgba(0,0,0,.25)}
.game-controls{display:flex;gap:12px;justify-content:center}
.game-mode-tag{padding:6px 14px;border-radius:20px;background:rgba(124,77,255,.2);
  border:1px solid rgba(124,77,255,.4);font-size:.8rem;font-weight:600}
.timer{font-family:'Orbitron',sans-serif;color:var(--accent)}

/* チャット */
.chat-side{display:flex;flex-direction:column;padding:0;overflow:hidden;height:100%;min-height:400px}
.chat-head{padding:16px 18px;border-bottom:1px solid var(--glass-brd);font-size:.95rem;display:flex;align-items:center;gap:8px}
.chat-head i{color:var(--accent)}
.chat-body,.dm-body{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px}
.msg{max-width:85%;padding:9px 13px;border-radius:14px;font-size:.86rem;line-height:1.4;word-break:break-word}
.msg.me{align-self:flex-end;background:linear-gradient(135deg,var(--primary),var(--primary-2));border-bottom-right-radius:4px}
.msg.them{align-self:flex-start;background:rgba(255,255,255,.08);border-bottom-left-radius:4px}
.msg .m-name{font-size:.7rem;color:var(--accent-2);font-weight:700;display:block;margin-bottom:2px}
.msg .m-time{font-size:.62rem;color:rgba(255,255,255,.5);display:block;margin-top:3px;text-align:right}
.chat-input-row{display:flex;gap:8px;padding:14px;border-top:1px solid var(--glass-brd)}
.chat-input-row input{flex:1;background:rgba(255,255,255,.06);border:1px solid var(--glass-brd);
  border-radius:11px;padding:11px 14px;color:#fff;outline:none;font-family:inherit}

/* ==================== モーダル ==================== */
.modal-overlay{position:fixed;inset:0;z-index:1500;display:none;place-items:center;padding:20px;
  background:rgba(7,9,18,.7);backdrop-filter:blur(6px)}
.modal-overlay.active{display:grid;animation:fadeUp .3s ease}
.modal{width:100%;max-width:460px;padding:30px}
.modal h2{font-size:1.3rem;margin-bottom:6px;display:flex;align-items:center;gap:10px}
.modal h2 i{color:var(--accent)}
.modal-sub{color:var(--muted);font-size:.85rem;margin:16px 0 10px}
.diff-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
.diff-card{padding:16px 8px;border-radius:14px;border:1px solid var(--glass-brd);background:rgba(255,255,255,.04);
  cursor:pointer;color:var(--light);display:flex;flex-direction:column;align-items:center;gap:6px;transition:.25s;font-family:inherit}
.diff-card i{font-size:22px}
.diff-card span{font-weight:700;font-size:.9rem}
.diff-card small{color:var(--muted);font-size:.68rem}
.diff-card.active{border-color:var(--primary);background:rgba(124,77,255,.16);box-shadow:0 8px 22px rgba(124,77,255,.3)}
.color-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.color-card{padding:14px;border-radius:14px;border:1px solid var(--glass-brd);background:rgba(255,255,255,.04);
  cursor:pointer;color:var(--light);display:flex;align-items:center;gap:10px;justify-content:center;font-weight:600;transition:.25s;font-family:inherit}
.color-card .disc{width:26px;height:26px}
.color-card.active{border-color:var(--accent);background:rgba(0,229,255,.12)}
.modal-actions{display:flex;gap:12px;margin-top:24px;justify-content:flex-end}
.code-input{width:100%;margin-top:16px;text-align:center;font-family:'Orbitron',sans-serif;font-size:2.4rem;
  letter-spacing:14px;padding:16px;border-radius:14px;background:rgba(255,255,255,.06);
  border:1px solid var(--glass-brd);color:#fff;outline:none}
.code-input:focus{border-color:var(--primary)}

/* DMモーダル */
.dm-modal{max-width:480px;height:min(600px,85vh);display:flex;flex-direction:column;padding:0}
.dm-head{display:flex;align-items:center;gap:12px;padding:18px 20px;border-bottom:1px solid var(--glass-brd)}
.dm-head h2{flex:1;font-size:1.1rem;margin:0}
.dm-friend-list{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:8px}
.dm-friend-item{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:12px;
  background:rgba(255,255,255,.04);cursor:pointer;transition:.2s}
.dm-friend-item:hover{background:rgba(255,255,255,.1)}
.dm-friend-item .avatar{width:34px;height:34px;font-size:15px}
#dm-conversation{flex:1;display:flex;flex-direction:column;overflow:hidden}

/* 結果モーダル */
.result-modal{text-align:center;max-width:420px}
.result-icon{width:88px;height:88px;margin:0 auto 16px;border-radius:50%;font-size:40px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--gold),#ffb020);color:#000;box-shadow:0 10px 30px rgba(255,209,79,.5)}
.result-icon.lose{background:linear-gradient(135deg,var(--muted),#5a5f7a);color:#fff;box-shadow:none}
.result-icon.draw{background:linear-gradient(135deg,var(--accent),var(--primary));color:#fff}
.result-detail{color:var(--muted);margin:6px 0 14px}
.result-score{font-family:'Orbitron',sans-serif;font-size:1.6rem;margin-bottom:24px;
  background:linear-gradient(90deg,var(--accent),var(--primary-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* トースト */
#toast-wrap{position:fixed;top:20px;left:50%;transform:translateX(-50%);z-index:3000;
  display:flex;flex-direction:column;gap:10px;align-items:center;pointer-events:none}
.toast{padding:13px 22px;border-radius:12px;background:var(--glass);backdrop-filter:blur(14px);
  border:1px solid var(--glass-brd);border-left:4px solid var(--accent);box-shadow:var(--shadow);
  font-size:.9rem;font-weight:500;animation:toastIn .4s ease;max-width:90vw}
.toast.success{border-left-color:var(--success)}
.toast.error{border-left-color:var(--danger)}
.toast.warning{border-left-color:var(--warning)}
@keyframes toastIn{from{opacity:0;transform:translateY(-14px)}to{opacity:1;transform:translateY(0)}}

/* スクロールバー */
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(124,77,255,.4);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:rgba(124,77,255,.7)}

/* ==================== レスポンシブ ==================== */
@media(max-width:960px){
  .lobby-grid{grid-template-columns:1fr 1fr}
  .span-2{grid-column:span 2}
  .game-layout{grid-template-columns:1fr}
  .chat-side{min-height:300px;max-height:340px}
}
@media(max-width:640px){
  .lobby-grid{grid-template-columns:1fr}
  .span-2{grid-column:span 1}
  .mode-grid{grid-template-columns:1fr 1fr}
  .topbar{flex-wrap:wrap;gap:10px}
  .brand{font-size:1.6rem}
  .diff-grid{grid-template-columns:1fr}
  .board-coords-top,.board-coords-left{display:none}
  .pcard{padding:10px 12px}
  .pcount{font-size:1.2rem}
  .user-meta{display:none}
}