/* ============================================================
   OTHELLO ∞  —  Futuristic UI
   ============================================================ */
:root{
  --bg:#05060f;
  --bg2:#0a0d1f;
  --panel:rgba(18,22,44,.55);
  --panel-solid:#11142b;
  --border:rgba(120,160,255,.18);
  --cyan:#22e0ff;
  --violet:#8b5cff;
  --magenta:#ff3fb4;
  --green:#31ffa8;
  --gold:#ffd24a;
  --text:#e8ecff;
  --muted:#8b93c7;
  --glow-cyan:0 0 20px rgba(34,224,255,.55);
  --glow-violet:0 0 24px rgba(139,92,255,.55);
  --grad:linear-gradient(135deg,#22e0ff 0%,#8b5cff 55%,#ff3fb4 100%);
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  font-family:'Noto Sans JP',system-ui,sans-serif;
  background:radial-gradient(120% 120% at 50% 0%,#0a0f2a 0%,var(--bg) 60%);
  color:var(--text);
  overflow-x:hidden;
  min-height:100vh;
}
.font-display{font-family:'Orbitron',sans-serif;letter-spacing:.04em}

/* ---------- Background FX ---------- */
#bg-fx{position:fixed;inset:0;z-index:-1;overflow:hidden}
.grid-plane{
  position:absolute;inset:-50% 0 -20% 0;
  background-image:linear-gradient(rgba(80,120,255,.10) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(80,120,255,.10) 1px,transparent 1px);
  background-size:60px 60px;
  transform:perspective(600px) rotateX(62deg);
  transform-origin:top center;
  animation:gridmove 14s linear infinite;
  opacity:.5;
}
@keyframes gridmove{from{background-position:0 0}to{background-position:0 60px}}
.orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5;animation:float 16s ease-in-out infinite}
.orb1{width:420px;height:420px;background:#22e0ff;top:-120px;left:-120px}
.orb2{width:380px;height:380px;background:#8b5cff;bottom:-140px;right:-100px;animation-delay:-5s}
.orb3{width:300px;height:300px;background:#ff3fb4;top:40%;left:60%;animation-delay:-9s;opacity:.35}
@keyframes float{0%,100%{transform:translate(0,0)}33%{transform:translate(40px,-30px)}66%{transform:translate(-30px,40px)}}

/* ---------- Layout ---------- */
#app{max-width:1080px;margin:0 auto;padding:22px 16px 60px;min-height:100vh}
.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px;gap:12px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:12px;cursor:pointer}
.logo-mark{
  width:44px;height:44px;border-radius:12px;background:var(--grad);
  display:grid;place-items:center;box-shadow:var(--glow-violet);position:relative;
}
.logo-mark::before{content:"";position:absolute;width:20px;height:20px;border-radius:50%;
  background:conic-gradient(#000 0 50%,#fff 50% 100%);border:2px solid rgba(255,255,255,.6)}
.logo h1{font-size:22px}
.logo .grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.logo small{display:block;font-size:10px;color:var(--muted);letter-spacing:.35em}

.user-chip{display:flex;align-items:center;gap:10px}
.user-chip .info{text-align:right;line-height:1.25}
.user-chip .uname{font-weight:800;font-size:14px}
.user-chip .rate{font-size:12px;color:var(--cyan);font-family:'Orbitron'}
.avatar{width:40px;height:40px;border-radius:50%;background:var(--grad);display:grid;place-items:center;font-weight:800;color:#fff;box-shadow:var(--glow-cyan)}

/* ---------- Glass panel ---------- */
.glass{
  background:var(--panel);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--border);
  border-radius:20px;
  box-shadow:0 12px 40px rgba(0,0,0,.45), inset 0 1px 0 rgba(255,255,255,.06);
}

/* ---------- Buttons ---------- */
.btn{
  font-family:'Noto Sans JP';font-weight:700;font-size:15px;color:#fff;cursor:pointer;
  border:none;border-radius:14px;padding:13px 22px;position:relative;overflow:hidden;
  transition:transform .15s ease, box-shadow .2s ease, filter .2s;display:inline-flex;
  align-items:center;justify-content:center;gap:9px;
}
.btn:active{transform:scale(.96)}
.btn-primary{background:var(--grad);box-shadow:var(--glow-violet)}
.btn-primary:hover{filter:brightness(1.12);box-shadow:0 0 34px rgba(139,92,255,.8)}
.btn-cyan{background:linear-gradient(135deg,#22e0ff,#1f8cff);box-shadow:var(--glow-cyan)}
.btn-cyan:hover{filter:brightness(1.12)}
.btn-ghost{background:rgba(255,255,255,.06);border:1px solid var(--border)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-danger{background:linear-gradient(135deg,#ff4d6d,#c81e5b)}
.btn-block{width:100%}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* ---------- Inputs ---------- */
.field{margin-bottom:16px}
.field label{display:block;font-size:12px;color:var(--muted);margin-bottom:7px;letter-spacing:.05em}
.field input{
  width:100%;padding:14px 16px;border-radius:12px;border:1px solid var(--border);
  background:rgba(0,0,0,.35);color:var(--text);font-size:15px;font-family:inherit;transition:.2s;
}
.field input:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,224,255,.18)}

/* ---------- Auth ---------- */
.auth-wrap{min-height:80vh;display:grid;place-items:center}
.auth-card{width:100%;max-width:410px;padding:38px 32px}
.auth-card h2{font-size:26px;margin-bottom:6px}
.auth-card .sub{color:var(--muted);font-size:13px;margin-bottom:26px}
.tab-row{display:flex;gap:8px;margin-bottom:24px;background:rgba(0,0,0,.3);padding:6px;border-radius:14px}
.tab-row button{flex:1;padding:11px;border:none;background:transparent;color:var(--muted);font-weight:700;border-radius:10px;cursor:pointer;transition:.2s;font-family:inherit}
.tab-row button.active{background:var(--grad);color:#fff;box-shadow:var(--glow-violet)}

/* ---------- Lobby ---------- */
.hero{text-align:center;padding:26px 20px 34px}
.hero h2{font-size:clamp(30px,6vw,52px);line-height:1.05;margin-bottom:12px}
.hero p{color:var(--muted);max-width:520px;margin:0 auto;font-size:15px}
.mode-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px;margin-top:30px}
.mode-card{padding:26px 22px;cursor:pointer;transition:.25s;position:relative;overflow:hidden;text-align:left}
.mode-card:hover{transform:translateY(-6px)}
.mode-card::after{content:"";position:absolute;inset:0;border-radius:20px;padding:1px;
  background:var(--grad);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.25s}
.mode-card:hover::after{opacity:1}
.mode-ico{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;font-size:24px;margin-bottom:16px}
.ico-bot{background:linear-gradient(135deg,#22e0ff33,#22e0ff11);color:var(--cyan);border:1px solid #22e0ff44}
.ico-room{background:linear-gradient(135deg,#8b5cff33,#8b5cff11);color:var(--violet);border:1px solid #8b5cff44}
.ico-random{background:linear-gradient(135deg,#ff3fb433,#ff3fb411);color:var(--magenta);border:1px solid #ff3fb444}
.ico-rank{background:linear-gradient(135deg,#ffd24a33,#ffd24a11);color:var(--gold);border:1px solid #ffd24a44}
.mode-card h3{font-size:20px;margin-bottom:8px}
.mode-card p{color:var(--muted);font-size:13px;line-height:1.6}

.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:26px}
.stat{padding:18px 12px;text-align:center}
.stat .num{font-family:'Orbitron';font-size:26px;font-weight:900}
.stat .lbl{font-size:11px;color:var(--muted);margin-top:4px;letter-spacing:.08em}
.c-cyan{color:var(--cyan)}.c-green{color:var(--green)}.c-magenta{color:var(--magenta)}.c-gold{color:var(--gold)}

/* ---------- Section title ---------- */
.section-head{display:flex;align-items:center;justify-content:space-between;margin:8px 0 22px}
.section-head h2{font-size:24px}
.back-btn{cursor:pointer;color:var(--muted);display:inline-flex;align-items:center;gap:8px;font-weight:700;transition:.2s}
.back-btn:hover{color:var(--cyan)}

/* ---------- Difficulty ---------- */
.diff-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:24px}
.diff-card{padding:20px;text-align:center;cursor:pointer;border:1px solid var(--border);border-radius:16px;transition:.2s;background:rgba(0,0,0,.25)}
.diff-card:hover{transform:translateY(-4px);border-color:var(--cyan)}
.diff-card.selected{border-color:var(--cyan);box-shadow:var(--glow-cyan);background:rgba(34,224,255,.08)}
.diff-card .lv{font-family:'Orbitron';font-size:13px;color:var(--muted)}
.diff-card .name{font-size:19px;font-weight:800;margin:6px 0}
.diff-card .stars{color:var(--gold);font-size:12px}
.color-pick{display:flex;gap:14px;justify-content:center;margin-bottom:26px}
.color-opt{padding:14px 26px;border-radius:14px;border:1px solid var(--border);cursor:pointer;display:flex;align-items:center;gap:10px;font-weight:700;transition:.2s;background:rgba(0,0,0,.25)}
.color-opt.selected{border-color:var(--cyan);box-shadow:var(--glow-cyan)}
.disc-mini{width:22px;height:22px;border-radius:50%}
.disc-mini.black{background:radial-gradient(circle at 35% 30%,#555,#000);border:1px solid #444}
.disc-mini.white{background:radial-gradient(circle at 35% 30%,#fff,#ccc);border:1px solid #999}

/* ---------- Game board ---------- */
.game-layout{display:grid;grid-template-columns:1fr;gap:20px}
@media(min-width:860px){.game-layout{grid-template-columns:1fr 280px}}
.board-panel{padding:20px;display:flex;flex-direction:column;align-items:center}
.score-strip{display:flex;justify-content:space-between;width:100%;max-width:560px;margin-bottom:16px;gap:12px}
.player-box{flex:1;display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:14px;background:rgba(0,0,0,.3);border:1px solid var(--border);transition:.3s}
.player-box.active{border-color:var(--cyan);box-shadow:var(--glow-cyan)}
.player-box.right{flex-direction:row-reverse;text-align:right}
.pb-disc{width:30px;height:30px;border-radius:50%;flex-shrink:0}
.pb-disc.black{background:radial-gradient(circle at 35% 30%,#555,#000);border:1px solid #444}
.pb-disc.white{background:radial-gradient(circle at 35% 30%,#fff,#d5d5d5);border:1px solid #999}
.pb-name{font-weight:800;font-size:14px}
.pb-count{font-family:'Orbitron';font-size:24px;font-weight:900}

.board{
  --sz:min(88vw,560px);
  width:var(--sz);height:var(--sz);
  display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);
  gap:3px;padding:12px;border-radius:18px;
  background:linear-gradient(135deg,#0d7a4f,#0a5c3c);
  box-shadow:0 0 0 2px rgba(34,224,255,.25),0 22px 60px rgba(0,0,0,.6),inset 0 0 40px rgba(0,0,0,.4);
  position:relative;
}
.cell{
  background:rgba(0,0,0,.18);border-radius:6px;position:relative;cursor:pointer;
  display:grid;place-items:center;transition:background .15s;
}
.cell:hover{background:rgba(0,0,0,.28)}
.cell.playable::after{content:"";width:26%;height:26%;border-radius:50%;background:rgba(255,255,255,.28);
  box-shadow:0 0 12px rgba(34,224,255,.7);animation:pulse 1.4s ease-in-out infinite}
@keyframes pulse{0%,100%{transform:scale(.8);opacity:.4}50%{transform:scale(1.15);opacity:.9}}
.cell.last::before{content:"";position:absolute;inset:3px;border:2px solid var(--gold);border-radius:6px;opacity:.8;pointer-events:none}
.disc{width:82%;height:82%;border-radius:50%;transition:transform .35s ease;transform-style:preserve-3d;position:relative}
.disc.b{background:radial-gradient(circle at 35% 30%,#4a4a4a,#050505);box-shadow:0 4px 8px rgba(0,0,0,.6),inset 0 2px 4px rgba(255,255,255,.15)}
.disc.w{background:radial-gradient(circle at 35% 30%,#ffffff,#c8c8c8);box-shadow:0 4px 8px rgba(0,0,0,.5),inset 0 2px 4px rgba(255,255,255,.6)}
.disc.place{animation:place .4s cubic-bezier(.2,1.4,.4,1)}
@keyframes place{from{transform:scale(0) rotate(-90deg)}to{transform:scale(1) rotate(0)}}

/* ---------- Side panel ---------- */
.side-panel{display:flex;flex-direction:column;gap:16px}
.turn-banner{padding:18px;text-align:center}
.turn-banner .lbl{font-size:12px;color:var(--muted);letter-spacing:.1em}
.turn-banner .who{font-size:20px;font-weight:800;margin-top:6px}
.turn-banner .who .dot{display:inline-block;width:14px;height:14px;border-radius:50%;vertical-align:middle;margin-right:6px}
.side-actions{display:flex;flex-direction:column;gap:10px}

.room-code-box{text-align:center;padding:26px}
.room-code-box .code{font-family:'Orbitron';font-size:40px;font-weight:900;letter-spacing:.12em;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;margin:12px 0}
.waiting-dots{display:inline-flex;gap:6px;margin-top:8px}
.waiting-dots span{width:10px;height:10px;border-radius:50%;background:var(--cyan);animation:bounce 1.2s infinite}
.waiting-dots span:nth-child(2){animation-delay:.2s}
.waiting-dots span:nth-child(3){animation-delay:.4s}
@keyframes bounce{0%,100%{transform:translateY(0);opacity:.4}50%{transform:translateY(-8px);opacity:1}}

/* ---------- Leaderboard / history table ---------- */
.tbl{width:100%;border-collapse:collapse}
.tbl th{text-align:left;font-size:11px;color:var(--muted);letter-spacing:.08em;padding:12px 14px;border-bottom:1px solid var(--border)}
.tbl td{padding:13px 14px;border-bottom:1px solid rgba(255,255,255,.05);font-size:14px}
.tbl tr:hover td{background:rgba(255,255,255,.03)}
.rank-badge{font-family:'Orbitron';font-weight:900;width:30px;display:inline-block}
.rank-1{color:var(--gold)}.rank-2{color:#cfd8e6}.rank-3{color:#d9995b}
.tbl .rt{font-family:'Orbitron';color:var(--cyan);font-weight:700}
.win{color:var(--green)}.loss{color:#ff6b81}.draw{color:var(--muted)}

/* ---------- Result overlay ---------- */
.overlay{position:fixed;inset:0;background:rgba(3,5,15,.8);backdrop-filter:blur(8px);z-index:200;display:grid;place-items:center;padding:20px;animation:fade .3s}
@keyframes fade{from{opacity:0}to{opacity:1}}
.result-card{max-width:400px;width:100%;padding:40px 32px;text-align:center;animation:pop .45s cubic-bezier(.2,1.4,.4,1)}
@keyframes pop{from{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}
.result-card .rtitle{font-family:'Orbitron';font-size:42px;font-weight:900;margin-bottom:10px}
.result-win{background:linear-gradient(135deg,#31ffa8,#22e0ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.result-lose{color:#ff6b81}
.result-draw{color:var(--gold)}
.result-card .rscore{font-family:'Orbitron';font-size:22px;margin:14px 0 8px}
.rating-delta{font-size:15px;margin-bottom:24px}
.rating-delta .up{color:var(--green)}.rating-delta .down{color:#ff6b81}

/* ---------- Toast ---------- */
#toast-wrap{position:fixed;top:20px;left:50%;transform:translateX(-50%);z-index:300;display:flex;flex-direction:column;gap:10px;width:calc(100% - 40px);max-width:380px}
.toast{padding:14px 18px;border-radius:12px;font-weight:600;font-size:14px;animation:slidein .3s;display:flex;align-items:center;gap:10px}
.toast.err{background:linear-gradient(135deg,#c81e5b,#ff4d6d);box-shadow:0 8px 24px rgba(200,30,91,.4)}
.toast.ok{background:linear-gradient(135deg,#0f9d6a,#31ffa8);color:#04140d;box-shadow:0 8px 24px rgba(49,255,168,.3)}
.toast.info{background:linear-gradient(135deg,#1f8cff,#22e0ff);color:#04121e}
@keyframes slidein{from{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}

/* ---------- misc ---------- */
.center{text-align:center}
.mt-2{margin-top:16px}.mt-3{margin-top:24px}
.spinner{width:44px;height:44px;border:3px solid rgba(255,255,255,.15);border-top-color:var(--cyan);border-radius:50%;animation:spin 1s linear infinite;margin:0 auto}
@keyframes spin{to{transform:rotate(360deg)}}
.link{color:var(--cyan);cursor:pointer;text-decoration:none}
.link:hover{text-decoration:underline}
.muted{color:var(--muted)}
.badge-mode{display:inline-block;padding:3px 9px;border-radius:20px;font-size:11px;font-weight:700}
.bm-bot{background:#22e0ff22;color:var(--cyan)}
.bm-room{background:#8b5cff22;color:var(--violet)}
.bm-random{background:#ff3fb422;color:var(--magenta)}