@property --angle {
  syntax: '<angle>';
  initial-value: 0deg;
  inherits: false;
}
@keyframes border-spin {
  to { --angle: 360deg; }
}

:root{
  --g-blue:#4285F4; --g-red:#EA4335; --g-yellow:#FBBC05; --g-green:#34A853;
  --ink:#3C4043; --ink-soft:#5F6368; --line:#E8EAED; --bg:#FFFFFF; --bg-soft:#F8F9FA;
  --grad-full:linear-gradient(120deg,#4285F4 0%,#EA4335 35%,#FBBC05 65%,#34A853 100%);
}
*{margin:0;padding:0;box-sizing:border-box}
[hidden]{display:none!important}
body{font-family:'Inter','Noto Sans JP','Hiragino Kaku Gothic ProN',sans-serif;color:var(--ink);background:var(--bg-soft);line-height:1.6;-webkit-font-smoothing:antialiased;overflow:hidden}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,textarea{font-family:inherit}

.app{display:grid;grid-template-columns:64px 300px 1fr;grid-template-rows:100vh;height:100vh}

/* ===== 左端チャネルレール ===== */
.rail{display:flex;flex-direction:column;align-items:center;gap:8px;padding:12px 0;background:#202124}
.rail-brand{display:block;width:40px;height:40px;margin-bottom:10px}
.rail-brand img{width:100%;height:100%}
.rail-channels{display:flex;flex-direction:column;gap:8px;flex:1}
.rail-ch{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:#fff;transition:.15s;font-size:18px}
.rail-ch img{width:20px;height:20px}
.rail-ch:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,0,0,.4)}
.rail-ch.active{box-shadow:0 0 0 2.5px var(--g-blue),0 4px 14px rgba(66,133,244,.5)}
.rail-ch.soon{opacity:.35;cursor:not-allowed}
.rail-foot{margin-top:auto}

/* ===== 会話リスト ===== */
.list-pane{display:flex;flex-direction:column;background:#fff;border-inline-end:1px solid var(--line);min-width:0;min-height:0;overflow:hidden}
.list-head{display:flex;align-items:center;gap:10px;padding:16px 18px 10px}
.list-head h1{font-size:17px;font-weight:800;letter-spacing:-.3px}
.ws-badge{font-size:11px;font-weight:700;color:#fff;background:var(--g-green);border-radius:20px;padding:2px 10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:140px}
.list-search{padding:0 14px 12px;border-bottom:1px solid var(--line)}
.list-search input{width:100%;border:1px solid var(--line);border-radius:22px;padding:8px 16px;font-size:13px;background:var(--bg-soft);outline:none;transition:.15s}
.list-search input:focus{border-color:var(--g-blue);background:#fff;box-shadow:0 0 0 3px rgba(66,133,244,.15)}
.conv-list{flex:1;overflow-y:auto;padding:8px}
.list-empty{padding:40px 20px;text-align:center;color:var(--ink-soft);font-size:13px}
.conv-item{display:grid;grid-template-columns:10px 1fr auto;column-gap:10px;align-items:center;width:100%;text-align:start;padding:11px 12px;border-radius:12px;transition:.13s;margin-bottom:2px}
.conv-item:hover{background:var(--bg-soft)}
.conv-item.on{background:rgba(66,133,244,.10)}
.conv-tag{width:10px;height:10px;border-radius:50%;background:var(--g-blue)}
.conv-item:nth-child(4n+2) .conv-tag{background:var(--g-red)}
.conv-item:nth-child(4n+3) .conv-tag{background:var(--g-yellow)}
.conv-item:nth-child(4n+0) .conv-tag{background:var(--g-green)}
.conv-name{font-size:13.5px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv-meta{font-size:11px;color:var(--ink-soft)}

/* ===== メッセージペイン ===== */
.msg-pane{display:flex;flex-direction:column;min-width:0;min-height:0;overflow:hidden;background:var(--bg-soft)}

/* 未接続ビュー */
.connect-view{flex:1;display:flex;align-items:center;justify-content:center;padding:24px;background:
  radial-gradient(700px 380px at 14% -6%,rgba(66,133,244,.20),transparent),
  radial-gradient(620px 340px at 88% -2%,rgba(52,168,83,.18),transparent),
  radial-gradient(540px 320px at 70% 60%,rgba(251,188,5,.14),transparent),
  radial-gradient(540px 320px at 22% 70%,rgba(234,67,53,.12),transparent)}
.connect-card{position:relative;max-width:480px;text-align:center;background:#fff;border-radius:22px;padding:48px 42px;box-shadow:0 24px 70px rgba(60,64,67,.16)}
.connect-card::before{content:"";position:absolute;inset:-2.5px;z-index:-1;border-radius:24px;
  background:
    conic-gradient(from var(--angle),transparent 0%,transparent 78%,#4285F4 82%,#EA4335 87%,#FBBC05 92%,#34A853 96%,transparent 100%),
    var(--line);
  animation:border-spin 3.5s linear infinite}
.connect-logo{width:64px;height:64px;border-radius:18px;display:inline-flex;align-items:center;justify-content:center;margin-bottom:20px;background:#fff;border:1px solid var(--line);box-shadow:0 10px 26px rgba(60,64,67,.18)}
.connect-logo img{width:32px;height:32px}
.connect-card h2{font-size:21px;font-weight:800;letter-spacing:-.4px;margin-bottom:10px}
.connect-card p{font-size:13.5px;color:var(--ink-soft);margin-bottom:26px}
.connect-note{margin-top:18px;font-size:12px;color:var(--g-red)}

.btn{display:inline-flex;align-items:center;gap:10px;font-weight:700;border-radius:28px;padding:13px 30px;font-size:14.5px;transition:.18s}
.btn-slack{background:#611f69;color:#fff;box-shadow:0 6px 22px rgba(97,31,105,.45)}
.btn-slack:hover{background:#4a1751;transform:translateY(-1px);box-shadow:0 8px 28px rgba(97,31,105,.55)}
.btn-slack img{width:17px;height:17px}

/* 会話未選択 */
.placeholder-view{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:var(--ink-soft);font-size:14px}
.ph-dots{display:flex;gap:8px}
.ph-dots i{width:12px;height:12px;border-radius:50%}
.d-blue{background:var(--g-blue)}.d-red{background:var(--g-red)}.d-yellow{background:var(--g-yellow)}.d-green{background:var(--g-green)}

/* 会話ビュー */
.thread-view{flex:1;display:flex;flex-direction:column;min-height:0}
.thread-head{display:flex;align-items:center;gap:12px;padding:13px 20px;background:#fff;border-bottom:1px solid var(--line)}
.thread-ch-logo{width:38px;height:38px;border-radius:11px;display:flex;align-items:center;justify-content:center;flex:none;background:#fff;border:1px solid var(--line)}
.thread-ch-logo img{width:19px;height:19px}
.thread-head h2{font-size:15.5px;font-weight:800;line-height:1.25}
.thread-sub{font-size:11.5px;color:var(--ink-soft)}
.btn-icon{margin-inline-start:auto;width:36px;height:36px;border-radius:10px;font-size:17px;color:var(--ink-soft);transition:.15s}
.btn-icon:hover{background:var(--bg-soft);color:var(--g-blue)}

.thread-body{flex:1;overflow-y:auto;padding:22px 24px;display:flex;flex-direction:column;gap:14px}
.msg{display:grid;grid-template-columns:38px 1fr;column-gap:12px;max-width:760px}
.msg-avatar{width:38px;height:38px;border-radius:11px;background:var(--grad-full);color:#fff;font-size:14px;font-weight:800;display:flex;align-items:center;justify-content:center;overflow:hidden}
.msg-avatar img{width:100%;height:100%;object-fit:cover}
.msg-head{display:flex;align-items:baseline;gap:8px;margin-bottom:2px}
.msg-name{font-size:13px;font-weight:800}
.msg-time{font-size:11px;color:var(--ink-soft)}
.msg-text{font-size:13.5px;background:#fff;border:1px solid var(--line);border-radius:4px 14px 14px 14px;padding:10px 14px;white-space:pre-wrap;word-break:break-word;box-shadow:0 1px 4px rgba(60,64,67,.06)}
.msg.me{grid-template-columns:1fr;max-width:760px;width:100%;margin-inline-start:auto;justify-items:end}
.msg.me .msg-head{flex-direction:row-reverse}
.msg.me .msg-text{background:rgba(66,133,244,.10);border-color:rgba(66,133,244,.25);border-radius:14px 4px 14px 14px}
.thread-day{align-self:center;font-size:11px;font-weight:700;color:var(--ink-soft);background:#fff;border:1px solid var(--line);border-radius:20px;padding:3px 14px}

.thread-compose{display:flex;align-items:flex-end;gap:10px;padding:14px 20px 18px;background:#fff;border-top:1px solid var(--line)}
.thread-compose textarea{flex:1;resize:none;border:1.5px solid var(--line);border-radius:16px;padding:11px 16px;font-size:13.5px;line-height:1.5;outline:none;max-height:140px;transition:.15s;background:var(--bg-soft)}
.thread-compose textarea:focus{border-color:var(--g-blue);background:#fff;box-shadow:0 0 0 3px rgba(66,133,244,.15)}
.btn-send{background:var(--g-blue);color:#fff;border-radius:24px;padding:11px 26px;font-size:14px;font-weight:700;box-shadow:0 4px 16px rgba(66,133,244,.45);transition:.18s}
.btn-send:hover{background:#3367D6;transform:translateY(-1px)}
.btn-send:disabled{opacity:.5;cursor:not-allowed;transform:none}

/* ログイン */
.login-view{position:fixed;inset:0;z-index:500;display:flex;align-items:center;justify-content:center;padding:24px;background:
  radial-gradient(700px 380px at 14% -6%,rgba(66,133,244,.22),transparent),
  radial-gradient(620px 340px at 88% -2%,rgba(52,168,83,.20),transparent),
  radial-gradient(540px 320px at 70% 70%,rgba(251,188,5,.16),transparent),
  radial-gradient(540px 320px at 22% 80%,rgba(234,67,53,.14),transparent),
  #fff}
.login-card{position:relative;width:100%;max-width:400px;text-align:center;background:#fff;border-radius:22px;padding:46px 40px;box-shadow:0 24px 70px rgba(60,64,67,.16)}
.login-card::before{content:"";position:absolute;inset:-2.5px;z-index:-1;border-radius:24px;
  background:
    conic-gradient(from var(--angle),transparent 0%,transparent 78%,#4285F4 82%,#EA4335 87%,#FBBC05 92%,#34A853 96%,transparent 100%),
    var(--line);
  animation:border-spin 3.5s linear infinite}
.login-mark{width:54px;height:54px;margin-bottom:10px}
.login-card h2{font-size:22px;font-weight:800;letter-spacing:-.4px}
.login-sub{font-size:13px;color:var(--ink-soft);margin:4px 0 24px}
.login-card input{display:block;width:100%;border:1.5px solid var(--line);border-radius:14px;padding:12px 16px;font-size:14px;margin-bottom:12px;outline:none;background:var(--bg-soft);transition:.15s;font-family:inherit}
.login-card input:focus{border-color:var(--g-blue);background:#fff;box-shadow:0 0 0 3px rgba(66,133,244,.15)}
.btn-login{width:100%;justify-content:center;background:var(--g-blue);color:#fff;margin-top:4px;box-shadow:0 4px 18px rgba(66,133,244,.45)}
.btn-login:hover{background:#3367D6;transform:translateY(-1px)}
.login-err{margin-top:14px;font-size:12.5px;color:var(--g-red)}

/* LINE連携ウィザード */
.wiz-overlay{position:fixed;inset:0;z-index:400;display:flex;align-items:center;justify-content:center;padding:24px;background:rgba(32,33,36,.55);backdrop-filter:blur(3px)}
.wiz-card{width:100%;max-width:540px;background:#fff;border-radius:20px;box-shadow:0 30px 80px rgba(0,0,0,.3);overflow:hidden}
.wiz-head{display:flex;align-items:center;gap:11px;padding:18px 22px 14px}
.wiz-head img{width:26px;height:26px}
.wiz-head h3{font-size:16.5px;font-weight:800;flex:1}
.wiz-x{font-size:15px;color:var(--ink-soft);width:32px;height:32px;border-radius:9px}
.wiz-x:hover{background:var(--bg-soft)}
.wiz-dots{display:flex;gap:7px;padding:0 22px 14px}
.wiz-dots i{flex:1;height:4px;border-radius:3px;background:var(--line);transition:.2s}
.wiz-dots i.on{background:#06C755}
.wiz-step{padding:8px 24px 20px;min-height:190px}
.wiz-step h4{font-size:14.5px;font-weight:800;margin-bottom:10px}
.wiz-step p{font-size:13px;color:var(--ink-soft);margin-bottom:12px}
.wiz-link{display:inline-block;font-size:13.5px;font-weight:700;color:var(--g-blue);border:1.5px solid var(--g-blue);border-radius:22px;padding:9px 20px;transition:.15s}
.wiz-link:hover{background:rgba(66,133,244,.08)}
.wiz-hint{font-size:11.5px;color:#9AA0A6;margin-top:14px}
.wiz-step input,.wiz-step textarea{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:11px 14px;font-size:13px;background:var(--bg-soft);outline:none;transition:.15s;font-family:inherit;resize:none}
.wiz-step input:focus,.wiz-step textarea:focus{border-color:#06C755;background:#fff;box-shadow:0 0 0 3px rgba(6,199,85,.15)}
.wiz-list{padding-inline-start:20px;font-size:13px;color:var(--ink)}
.wiz-list li{margin-bottom:10px}
.wiz-copy{display:flex;gap:8px;align-items:center;margin-top:6px}
.wiz-copy code{flex:1;font-size:11px;background:var(--bg-soft);border:1px solid var(--line);border-radius:9px;padding:8px 10px;word-break:break-all}
.wiz-copy button{font-size:12px;font-weight:700;color:var(--g-blue);border:1.5px solid var(--g-blue);border-radius:18px;padding:6px 14px;flex:none}
.wiz-copy button:hover{background:rgba(66,133,244,.08)}
.wiz-result{font-size:12.5px;color:var(--g-red);margin-top:10px}
.wiz-foot{display:flex;justify-content:space-between;align-items:center;padding:14px 22px 20px;border-top:1px solid var(--line)}
.wiz-back{font-size:13.5px;font-weight:700;color:var(--ink-soft);padding:10px 18px;border-radius:22px}
.wiz-back:hover{background:var(--bg-soft)}
.wiz-next{background:#06C755;color:#fff;margin-inline-start:auto;box-shadow:0 4px 16px rgba(6,199,85,.4)}
.wiz-next:hover{background:#05b34c;transform:translateY(-1px)}
.wiz-next:disabled{opacity:.5;transform:none}

/* トースト */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:300;background:#202124;color:#fff;font-size:13px;padding:12px 22px;border-radius:12px;box-shadow:0 8px 30px rgba(0,0,0,.3)}

/* レスポンシブ */
@media(max-width:900px){
  .app{grid-template-columns:56px 1fr}
  .list-pane{display:none}
  .app.show-list{grid-template-columns:56px 1fr}
  .app.show-list .list-pane{display:flex}
  .app.show-list .msg-pane{display:none}
}