:root{
    --bg:#0b0e1a;
    --bg-2:#0f1322;
    --panel:#141830;
    --panel-2:#1a1f3d;
    --glass:rgba(20,24,48,0.72);
    --text:#eef1ff;
    --muted:#9aa3cc;
    --muted-2:#6b74a3;
    --accent:#6c8cff;
    --accent-2:#a46cff;
    --accent-3:#4cd38a;
    --danger:#ff5b6e;
    --warning:#ffd35b;
    --border:#252a45;
    --border-2:#2f3761;
    --bubble:#1c2040;
    --bubble-self:linear-gradient(135deg,#3a4a9e,#2a356b);
    --shadow:0 10px 30px rgba(0,0,0,0.45);
    --shadow-lg:0 24px 60px rgba(0,0,0,0.55);
    --radius:16px;
    --radius-sm:10px;
    --radius-lg:24px;
    --ease:cubic-bezier(.22,.61,.36,1);
  }
  *{box-sizing:border-box}
  html,body{height:100%;margin:0}
  body{
    font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,
      "Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic UI","Meiryo",sans-serif;
    color:var(--text);
    background:
      radial-gradient(1000px 600px at -10% -10%,rgba(108,140,255,.20),transparent 60%),
      radial-gradient(800px 500px at 110% -10%,rgba(164,108,255,.18),transparent 60%),
      radial-gradient(900px 500px at 50% 120%,rgba(76,211,138,.10),transparent 60%),
      var(--bg);
    overflow:hidden;
  }
  button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
  input,textarea{font:inherit;color:inherit}
  ::-webkit-scrollbar{width:10px;height:10px}
  ::-webkit-scrollbar-thumb{background:#242a4d;border-radius:10px;border:2px solid transparent;background-clip:content-box}
  ::-webkit-scrollbar-thumb:hover{background:#333a66;background-clip:content-box}

  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:10px 16px;border-radius:12px;font-weight:600;
    border:1px solid var(--border);
    background:linear-gradient(180deg,var(--panel),var(--panel-2));
    transition:transform .08s var(--ease),border-color .2s,background .2s,box-shadow .2s;
  }
  .btn:hover{border-color:var(--border-2)}
  .btn:active{transform:translateY(1px) scale(.99)}
  .btn.primary{
    border-color:transparent;
    background:linear-gradient(135deg,var(--accent),var(--accent-2));
    box-shadow:0 8px 24px rgba(108,140,255,.35);
  }
  .btn.primary:hover{box-shadow:0 10px 30px rgba(108,140,255,.5)}
  .btn.danger{border-color:#503046;background:linear-gradient(180deg,#3a1b2a,#321727);color:#ffdbe1}
  .btn.ghost{background:transparent;border-color:transparent;color:var(--muted)}
  .btn.ghost:hover{background:rgba(255,255,255,.04);color:var(--text)}
  .btn.icon{padding:10px;border-radius:12px}
  .btn:disabled{opacity:.5;pointer-events:none}
  .btn.block{width:100%}

  .chip{
    display:inline-flex;align-items:center;gap:6px;padding:6px 12px;
    border-radius:999px;font-size:13px;font-weight:600;
    border:1px solid var(--border);background:var(--panel);
  }
  .chip.active{border-color:var(--border-2);background:var(--panel-2);color:#fff}
  .chip .dot{width:8px;height:8px;border-radius:50%}

  .avatar{
    display:flex;align-items:center;justify-content:center;
    border-radius:14px;font-weight:800;color:#fff;
    background:linear-gradient(135deg,#4a5ad0,#7a4ad0);
    flex-shrink:0;user-select:none;
  }
  .avatar.sm{width:34px;height:34px;font-size:13px;border-radius:11px}
  .avatar.md{width:44px;height:44px;font-size:15px}
  .avatar.lg{width:64px;height:64px;font-size:22px;border-radius:18px}

  .badge{
    display:inline-flex;align-items:center;justify-content:center;
    min-width:18px;height:18px;padding:0 5px;border-radius:999px;
    font-size:11px;font-weight:800;background:var(--danger);color:#fff;
  }

  .screen{
    position:fixed;inset:0;display:flex;flex-direction:column;
    opacity:0;pointer-events:none;transition:opacity .3s var(--ease);
    overflow:hidden;
  }
  .screen.active{opacity:1;pointer-events:auto}

  /* ============ 認証画面 ============ */
  #authScreen{
    align-items:center;justify-content:center;padding:20px;
    background:
      radial-gradient(700px 500px at 20% 10%,rgba(108,140,255,.22),transparent 60%),
      radial-gradient(600px 500px at 90% 90%,rgba(164,108,255,.22),transparent 60%),
      var(--bg);
    overflow-y:auto;
  }
  .auth-card{
    width:min(440px,100%);padding:32px 28px;border-radius:var(--radius-lg);
    background:var(--glass);backdrop-filter:blur(20px);
    border:1px solid var(--border);box-shadow:var(--shadow-lg);
    display:flex;flex-direction:column;gap:18px;
    animation:floatIn .5s var(--ease);margin:auto;
  }
  @keyframes floatIn{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
  .brand-row{display:flex;align-items:center;gap:12px}
  .logo{
    width:44px;height:44px;border-radius:14px;
    background:conic-gradient(from 210deg,var(--accent),var(--accent-2),var(--accent-3),var(--accent));
    box-shadow:0 0 24px rgba(108,140,255,.5);
  }
  .brand-title{font-size:20px;font-weight:800;letter-spacing:.3px}
  .brand-sub{font-size:12px;color:var(--muted)}

  .auth-tabs{display:flex;gap:6px;padding:4px;background:var(--bg-2);border-radius:14px;border:1px solid var(--border)}
  .auth-tab{
    flex:1;padding:9px 12px;border-radius:11px;font-weight:700;font-size:13.5px;color:var(--muted);
    transition:background .2s,color .2s;
  }
  .auth-tab.active{background:var(--panel-2);color:#fff;box-shadow:0 2px 10px rgba(0,0,0,.25)}

  .field{display:flex;flex-direction:column;gap:8px}
  .field label{font-size:13px;color:var(--muted);font-weight:600}
  .input,.textarea{
    width:100%;padding:12px 14px;border-radius:12px;
    border:1px solid var(--border);background:var(--bg-2);
    outline:none;transition:border-color .2s,box-shadow .2s;
  }
  .input:focus,.textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(108,140,255,.18)}
  .pw-wrap{position:relative}
  .pw-wrap .input{padding-right:46px}
  .pw-toggle{
    position:absolute;right:6px;top:50%;transform:translateY(-50%);
    width:36px;height:36px;border-radius:9px;display:flex;align-items:center;justify-content:center;
    color:var(--muted);font-size:16px;
  }
  .pw-toggle:hover{background:rgba(255,255,255,.06);color:var(--text)}
  .hint{font-size:11.5px;color:var(--muted-2);line-height:1.5}
  .err{font-size:12.5px;color:var(--danger);min-height:16px;font-weight:600}

  .avatar-picker{display:flex;gap:10px;flex-wrap:wrap}
  .av-opt{
    width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;
    font-weight:800;font-size:15px;color:#fff;border:2px solid transparent;
    transition:transform .1s var(--ease),border-color .2s,box-shadow .2s;
  }
  .av-opt:hover{transform:translateY(-2px)}
  .av-opt.selected{border-color:#fff;box-shadow:0 0 0 3px rgba(108,140,255,.4)}

  .auth-actions{display:flex;gap:10px;margin-top:4px}
  .auth-actions .btn{flex:1}

  /* ============ アプリ共通 ============ */
  .app-shell{flex:1;display:flex;min-height:0}

  .sidebar{
    width:340px;display:flex;flex-direction:column;min-height:0;
    background:var(--panel-2);border-right:1px solid var(--border);
    transition:transform .3s var(--ease);
  }
/* ============ サイドバー ============ */
.sidebar{
  width:340px;display:flex;flex-direction:column;min-height:0;
  background:var(--panel-2);border-right:1px solid var(--border);
  transition:transform .3s var(--ease), width .3s var(--ease);
  position:relative;
}

/* 上部ブランド */
.sidebar-brand{
  display:flex;align-items:center;gap:10px;
  padding:16px 16px 12px;
  border-bottom:1px solid var(--border);
}
.logo-sm{width:34px;height:34px;border-radius:11px}
.brand-title-sm{font-size:16px;font-weight:800;letter-spacing:.3px}

/* 下部ユーザー情報 */
.sidebar-foot{
  display:flex;align-items:center;gap:8px;
  padding:12px 14px;
  border-top:1px solid var(--border);
  background:linear-gradient(180deg, rgba(20,24,48,.4), rgba(20,24,48,.8));
}
.sidebar-foot .me{
  display:flex;align-items:center;gap:10px;flex:1;min-width:0;
}
.sidebar-foot .me-name{
  font-weight:700;font-size:14px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.sidebar-foot .me-status{
  font-size:11px;color:var(--accent-3);
  display:flex;align-items:center;gap:5px;
}
.sidebar-foot .me-status .dot{
  width:7px;height:7px;border-radius:50%;background:var(--accent-3);
}

/* 開閉ボタン（チャットヘッダー左） */
.sidebar-toggle{
  width:40px;height:40px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  border:1px solid transparent;color:var(--muted);
  transition:background .2s,color .2s,border-color .2s;
}
.sidebar-toggle:hover{
  background:rgba(255,255,255,.05);color:var(--text);border-color:var(--border);
}

/* サイドバーが閉じた状態 */
.sidebar.collapsed{
  width:0;overflow:hidden;border-right:0;
}
.sidebar.collapsed > *{opacity:0;pointer-events:none}

/* ルーム情報パネル（既存のまま、PC幅でもトグル可能に） */
.details{
  width:300px;border-left:1px solid var(--border);background:var(--panel-2);
  display:flex;flex-direction:column;overflow-y:auto;
  transition:transform .3s var(--ease), width .3s var(--ease);
}
.details.collapsed{
  width:0;overflow:hidden;border-left:0;
}
.details.collapsed > *{opacity:0;pointer-events:none}
  .me-name{font-weight:700;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .me-status{font-size:11px;color:var(--accent-3);display:flex;align-items:center;gap:5px}
  .me-status .dot{width:7px;height:7px;border-radius:50%;background:var(--accent-3)}
  .sidebar-search{padding:0 16px 12px}
  .search-wrap{position:relative}
  .search-wrap .input{padding-left:38px}
  .search-wrap svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);opacity:.5}
  .tabs{display:flex;gap:6px;padding:0 16px 12px;overflow-x:auto}
  .tabs::-webkit-scrollbar{display:none}
  .room-list{flex:1;overflow-y:auto;padding:4px 10px 16px;display:flex;flex-direction:column;gap:4px}
  .section-label{
    font-size:11px;font-weight:800;letter-spacing:.8px;text-transform:uppercase;
    color:var(--muted-2);padding:12px 10px 6px;
  }
  .room-item{
    display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:14px;
    cursor:pointer;transition:background .18s,border-color .18s;
    border:1px solid transparent;position:relative;
  }
  .room-item:hover{background:rgba(255,255,255,.03)}
  .room-item.active{background:var(--panel);border-color:var(--border-2)}
  .room-ico{
    width:44px;height:44px;border-radius:14px;flex-shrink:0;
    display:flex;align-items:center;justify-content:center;font-size:19px;
  }
  .room-ico.global{background:linear-gradient(135deg,#4a5ad0,#7a4ad0)}
  .room-ico.open{background:linear-gradient(135deg,#2f8f6b,#4cd38a)}
  .room-ico.private{background:linear-gradient(135deg,#8a4ad0,#c04ad0)}
  .room-body{flex:1;min-width:0}
  .room-name{font-weight:700;font-size:14px;display:flex;align-items:center;gap:6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .room-lock{font-size:11px;color:var(--muted-2)}
  .room-preview{font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-top:2px}
  .room-side{display:flex;flex-direction:column;align-items:flex-end;gap:4px;flex-shrink:0}
  .room-time{font-size:11px;color:var(--muted-2)}
/* ブランド行内の「＋」ボタン */
.fab{
  margin-left:auto;
  width:36px;height:36px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:20px;font-weight:700;line-height:1;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:0 6px 18px rgba(108,140,255,.35);
  transition:transform .15s var(--ease),box-shadow .2s;
}
.fab:hover{transform:translateY(-1px) scale(1.05);box-shadow:0 10px 24px rgba(108,140,255,.5)}
.fab:active{transform:scale(.95)}

  .chat{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bg)}
  .chat-head{
    display:flex;align-items:center;gap:12px;padding:14px 20px;
    border-bottom:1px solid var(--border);
    background:linear-gradient(180deg,rgba(23,26,43,.9),rgba(23,26,43,.7));
    backdrop-filter:blur(12px);z-index:4;
  }
  .chat-head .room-ico{width:40px;height:40px;font-size:17px;border-radius:12px}
  .chat-title{font-weight:800;font-size:16px;display:flex;align-items:center;gap:8px}
  .chat-sub{font-size:12px;color:var(--muted);margin-top:1px}
  .chat-head .spacer{flex:1}
  .icon-btn{
    width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;
    border:1px solid transparent;color:var(--muted);transition:background .2s,color .2s,border-color .2s;
  }
  .icon-btn:hover{background:rgba(255,255,255,.05);color:var(--text);border-color:var(--border)}
  .back-btn{display:none}

  .messages{
    flex:1;overflow-y:auto;padding:20px 20px 8px;
    display:flex;flex-direction:column;gap:4px;scroll-behavior:smooth;
  }
  .day-divider{
    align-self:center;margin:14px 0;font-size:11px;font-weight:700;color:var(--muted);
    padding:4px 12px;border-radius:999px;background:var(--panel);border:1px solid var(--border);
  }
  .msg{display:flex;gap:10px;max-width:78%;animation:msgIn .25s var(--ease)}
  @keyframes msgIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
  .msg.self{align-self:flex-end;flex-direction:row-reverse}
  .msg .avatar{margin-top:2px}
  .msg-col{display:flex;flex-direction:column;gap:3px;min-width:0}
  .msg.self .msg-col{align-items:flex-end}
  .msg-meta{display:flex;align-items:center;gap:6px;font-size:11.5px;color:var(--muted);padding:0 4px}
  .msg-meta .name{font-weight:700;color:#d6dcff}
  .bubble{
    padding:10px 14px;border-radius:18px;border-top-left-radius:6px;
    background:var(--bubble);border:1px solid var(--border);
    font-size:14.5px;line-height:1.55;white-space:pre-wrap;word-wrap:break-word;
    box-shadow:0 2px 8px rgba(0,0,0,.18);
  }
  .msg.self .bubble{
    background:var(--bubble-self);border-color:transparent;border-top-left-radius:18px;
    border-top-right-radius:6px;
  }
  .msg-tail{position:relative}
  .msg-actions{display:flex;gap:6px;margin-top:4px;opacity:0;transition:opacity .18s}
  .msg:hover .msg-actions{opacity:1}
  .react-btn{
    display:inline-flex;align-items:center;gap:4px;font-size:12px;
    padding:3px 8px;border-radius:999px;border:1px solid var(--border);
    background:var(--panel);color:var(--muted);transition:.15s;
  }
  .react-btn:hover{border-color:var(--border-2);color:var(--text)}
  .reactions{display:flex;gap:6px;flex-wrap:wrap;margin-top:4px}
  .react-chip{
    display:inline-flex;align-items:center;gap:5px;font-size:12.5px;font-weight:600;
    padding:3px 9px;border-radius:999px;border:1px solid var(--border-2);
    background:var(--panel-2);color:#dfe3ff;cursor:pointer;transition:.15s;
  }
  .react-chip:hover{transform:translateY(-1px)}
  .read-receipt{font-size:11px;color:var(--muted-2);padding:0 4px;text-align:right}
  .typing{
    display:flex;align-items:center;gap:8px;padding:4px 20px 10px;font-size:12.5px;color:var(--muted);
    min-height:26px;
  }
  .typing .dots{display:inline-flex;gap:3px}
  .typing .dots i{
    width:6px;height:6px;border-radius:50%;background:var(--muted);
    animation:bounce 1s infinite;
  }
  .typing .dots i:nth-child(2){animation-delay:.15s}
  .typing .dots i:nth-child(3){animation-delay:.3s}
  @keyframes bounce{0%,60%,100%{transform:translateY(0);opacity:.5}30%{transform:translateY(-4px);opacity:1}}

  .composer{padding:12px 16px 16px;border-top:1px solid var(--border);background:var(--bg-2)}
  .composer-row{display:flex;gap:10px;align-items:flex-end}
  .composer-box{
    flex:1;display:flex;align-items:flex-end;gap:6px;padding:6px 6px 6px 14px;
    border-radius:20px;border:1px solid var(--border);background:var(--panel);
    transition:border-color .2s,box-shadow .2s;
  }
  .composer-box:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px rgba(108,140,255,.15)}
  .composer-box textarea{
    flex:1;resize:none;border:0;outline:0;background:transparent;
    min-height:28px;max-height:140px;padding:8px 0;line-height:1.4;
  }
  .composer-tools{display:flex;gap:2px}
  .send-btn{
    width:44px;height:44px;border-radius:14px;flex-shrink:0;
    display:flex;align-items:center;justify-content:center;
    background:linear-gradient(135deg,var(--accent),var(--accent-2));
    box-shadow:0 6px 20px rgba(108,140,255,.4);
    transition:transform .1s var(--ease),opacity .2s;
  }
  .send-btn:hover{transform:translateY(-1px)}
  .send-btn:active{transform:scale(.95)}
  .send-btn:disabled{opacity:.4;pointer-events:none}

  .details{
    width:300px;border-left:1px solid var(--border);background:var(--panel-2);
    display:flex;flex-direction:column;overflow-y:auto;transition:transform .3s var(--ease);
  }
  .details-head{padding:16px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:10px}
  .details-title{font-weight:800;font-size:14px}
  .details-section{padding:16px;border-bottom:1px solid var(--border)}
  .details-section h4{margin:0 0 12px;font-size:11px;letter-spacing:.8px;text-transform:uppercase;color:var(--muted-2)}
  .member-row{display:flex;align-items:center;gap:10px;padding:6px 0}
  .member-row .name{font-size:13px;font-weight:600;flex:1}
  .online-dot{width:8px;height:8px;border-radius:50%;background:var(--accent-3)}
  .offline-dot{width:8px;height:8px;border-radius:50%;background:var(--muted-2)}

  .modal-backdrop{
    position:fixed;inset:0;background:rgba(5,6,12,.6);backdrop-filter:blur(4px);
    display:none;align-items:center;justify-content:center;padding:20px;z-index:50;
  }
  .modal-backdrop.show{display:flex;animation:fadeIn .2s var(--ease)}
  @keyframes fadeIn{from{opacity:0}to{opacity:1}}
  .modal{
    width:min(520px,100%);max-height:88vh;overflow-y:auto;
    background:var(--panel);border:1px solid var(--border);border-radius:20px;
    box-shadow:var(--shadow-lg);padding:22px;display:flex;flex-direction:column;gap:16px;
    animation:floatIn .25s var(--ease);
  }
  .modal h3{margin:0;font-size:18px;font-weight:800}
  .modal-sub{font-size:13px;color:var(--muted);margin-top:-8px}
  .modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:4px}
  .modal-actions .btn{flex:0 0 auto}
  .choice-row{display:flex;gap:10px}
  .choice{
    flex:1;padding:16px;border-radius:16px;border:2px solid var(--border);
    background:var(--bg-2);display:flex;flex-direction:column;gap:6px;align-items:flex-start;
    transition:border-color .2s,background .2s;
  }
  .choice:hover{border-color:var(--border-2)}
  .choice.selected{border-color:var(--accent);background:rgba(108,140,255,.08)}
  .choice .ico{font-size:22px}
  .choice .t{font-weight:800;font-size:14px}
  .choice .d{font-size:12px;color:var(--muted);line-height:1.4}

  .toast{
    position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(10px);
    background:var(--panel);color:var(--text);border:1px solid var(--border-2);
    border-radius:14px;padding:12px 18px;box-shadow:var(--shadow-lg);
    font-size:14px;font-weight:600;opacity:0;pointer-events:none;
    transition:opacity .25s,transform .25s;z-index:100;
  }
  .toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

  #adminScreen .app-shell{flex-direction:column}
  .admin-head{
    padding:16px 24px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:14px;
    background:linear-gradient(180deg,rgba(23,26,43,.9),rgba(23,26,43,.7));backdrop-filter:blur(12px);
  }
  .admin-head h2{margin:0;font-size:18px;font-weight:800;flex:1}
  .admin-body{flex:1;overflow-y:auto;padding:24px;display:grid;gap:20px;
    grid-template-columns:repeat(auto-fit,minmax(300px,1fr));align-content:start}
  .card{
    background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:18px;
    display:flex;flex-direction:column;gap:12px;
  }
  .card h3{margin:0;font-size:14px;font-weight:800;display:flex;align-items:center;gap:8px}
  .stat{display:flex;align-items:baseline;gap:8px}
  .stat .num{font-size:32px;font-weight:900;letter-spacing:-1px;
    background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
  .stat .lbl{font-size:12px;color:var(--muted)}
  .table-row{
    display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:1px solid var(--border);
    font-size:13px;
  }
  .table-row:last-child{border-bottom:0}
  .table-row .grow{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .pill{font-size:10px;font-weight:800;padding:2px 8px;border-radius:999px}
  .pill.warn{background:rgba(255,211,91,.18);color:var(--warning)}
  .pill.danger{background:rgba(255,91,110,.18);color:var(--danger)}
  .pill.ok{background:rgba(76,211,138,.18);color:var(--accent-3)}

  @media (max-width:1100px){
    .details{position:fixed;right:0;top:0;bottom:0;z-index:20;transform:translateX(100%);box-shadow:var(--shadow-lg)}
    .details.open{transform:none}
  }
@media (max-width:820px){
  .sidebar{position:fixed;left:0;top:0;bottom:0;z-index:20;width:min(340px,86vw);
    transform:translateX(-100%);box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:none}
  .msg{max-width:88%}
  .messages{padding:16px 12px 8px}
}
  .scrim{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:15;display:none}
  .scrim.show{display:block}
  .hidden{display:none !important}

.inquiry-pane{
  position:absolute;inset:0;display:none;flex-direction:column;
  background:var(--bg);z-index:10;
}
.inquiry-pane.open{display:flex}