:root{
  --bg:#ffffff; --fg:#111111; --muted:#6b6b6b; --line:#e8e8e8; --soft:#f5f6f8;
  --blue:#1d4ed8; --blue-ink:#ffffff; --blue-soft:#eaf0ff;
  --live:#22c55e; --off:#9ca3af; --radius:14px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--fg);
  font-family:Inter,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:17px; line-height:1.5; -webkit-font-smoothing:antialiased;
}
a{color:var(--blue)}
.wrap{max-width:860px;margin:0 auto;padding:0 16px}
.pixel{display:block;object-fit:contain}
.avatar{width:36px;height:36px;border-radius:9px;background:#fff;padding:2px}
.avatar.lg{width:120px;height:120px;border-radius:26px;padding:6px;border:1px solid var(--line)}
.avatar.sm{width:30px;height:30px;border-radius:8px;padding:2px;border:1px solid var(--line)}

/* blue top bar */
.topbar{background:var(--blue);color:var(--blue-ink)}
.topbar a{color:var(--blue-ink);text-decoration:none}
.nav{display:flex;align-items:center;gap:12px;padding:12px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;line-height:1.15}
.spacer{flex:1}
.pill{display:inline-flex;align-items:center;gap:8px;padding:5px 11px;border-radius:999px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);font-size:13px;font-weight:600;white-space:nowrap}
.dot{width:8px;height:8px;border-radius:50%;background:var(--off)}
.pill.live .dot{background:var(--live);box-shadow:0 0 0 3px rgba(34,197,94,.3)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:12px;border:1px solid transparent;font-weight:600;font-size:16px;cursor:pointer;text-decoration:none;font-family:inherit;transition:transform .05s ease}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--blue);color:var(--blue-ink)}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--fg)}
.topbar .btn.ghost{border-color:rgba(255,255,255,.4);color:#fff}
.btn.sm{padding:7px 13px;font-size:14px;border-radius:10px}

/* hero */
.hero{padding:56px 0 36px;text-align:center}
.hero .avatar{margin:0 auto 22px}
h1{font-size:clamp(32px,6vw,50px);line-height:1.08;letter-spacing:-.02em;margin:0 0 14px;font-weight:800}
.lead{font-size:18px;color:var(--muted);max-width:540px;margin:0 auto 26px}
.hero .actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.fine{font-size:14px;color:var(--muted);margin-top:16px}

/* sections */
section{padding:26px 0}
h2{font-size:22px;letter-spacing:-.01em;margin:0 0 16px;font-weight:700}
.grid{display:grid;gap:12px;grid-template-columns:repeat(3,1fr)}
@media (max-width:640px){.grid{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.card .num{display:inline-flex;width:28px;height:28px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;align-items:center;justify-content:center;font-size:13px;margin-bottom:10px}
.card h3{margin:0 0 4px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:15px}
.list{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.list li{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.list li span:last-child{color:var(--muted)}
.list b{color:var(--fg)}
.list .ic{font-size:18px;line-height:1.4}
.note{background:var(--blue-soft);color:var(--fg);border-radius:12px;padding:13px 16px;font-size:15px;margin-top:12px;border-left:4px solid var(--blue)}
.rules{display:grid;gap:12px;grid-template-columns:repeat(3,1fr)}
@media (max-width:640px){.rules{grid-template-columns:1fr}}
.rule{text-align:center;padding:20px 14px}
.rule .big{font-size:32px;font-weight:800;letter-spacing:-.02em;line-height:1;color:var(--blue)}
.rule .lbl{color:var(--muted);font-size:14px;margin-top:6px}
footer{padding:36px 0 56px;color:var(--muted);font-size:14px;text-align:center;border-top:1px solid var(--line);margin-top:28px}

/* login */
.center{min-height:calc(100dvh - 60px);display:grid;place-items:center;padding:24px 16px}
.login{width:100%;max-width:400px;text-align:center}
.login .avatar{margin:0 auto 16px}
.login h1{font-size:28px;margin-bottom:8px}
.login p{color:var(--muted);margin:0 0 20px}
.login p b{color:var(--fg)}
.field{display:grid;gap:8px;text-align:left;margin-bottom:12px}
.field label{font-size:14px;font-weight:600}
input[type=email],input[type=text]{width:100%;padding:13px 14px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--fg);font-size:16px;font-family:inherit;outline:none}
input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(29,78,216,.18)}
.hint{font-size:13px;color:var(--muted)}
.callout{margin-top:16px;background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:14px;text-align:left}
.callout.err{background:#fff5f3;border-color:#f3c9c0}
.back{margin-top:20px;font-size:14px}

/* chat */
.chat-top{position:sticky;top:0;z-index:5}
.count{font-size:13px;color:var(--muted);text-align:center;padding:10px 0 0}
.count b{color:var(--fg)}
.msgs{display:grid;gap:14px;padding:16px 0 150px}
.msg{display:flex;gap:10px;align-items:flex-start;max-width:85%}
.msg .avatar{margin-top:6px}
.msg.me{margin-left:auto;flex-direction:row-reverse}
.bubble{background:var(--soft);padding:12px 14px;border-radius:16px;border-bottom-left-radius:6px;white-space:pre-line}
.msg.me .bubble{background:var(--blue);color:#fff;border-radius:16px;border-bottom-right-radius:6px}
.bubble a{font-weight:600}
.meta{font-size:12px;color:var(--muted);margin-top:4px}
.file{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.35);border-radius:10px;padding:7px 10px;font-size:14px}
.waiting .bubble{display:flex;align-items:center;gap:10px;color:var(--muted)}
.dots span{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--muted);margin-right:3px;animation:b 1.2s infinite}
.dots span:nth-child(2){animation-delay:.2s}.dots span:nth-child(3){animation-delay:.4s}
@keyframes b{0%,80%,100%{opacity:.25;transform:translateY(0)}40%{opacity:1;transform:translateY(-3px)}}
.composer{position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--line);padding:10px 16px 16px}
.composer .row{max-width:860px;margin:0 auto;display:flex;gap:8px;align-items:center}
.composer .box{flex:1;display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:4px 4px 4px 14px;min-width:0}
.composer .box:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px rgba(29,78,216,.15)}
.composer .box input,.composer .box textarea{flex:1;width:100%;border:0;background:transparent;padding:10px 0;box-shadow:none;min-width:0;font-size:16px;font-family:inherit;color:var(--fg);outline:none}
.composer .box textarea{resize:none;line-height:1.35;max-height:160px;overflow-y:auto;align-self:center}
.composer .box input:focus,.composer .box textarea:focus{box-shadow:none}
.icon{width:40px;height:40px;flex:0 0 40px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--fg);display:grid;place-items:center;cursor:pointer;font-size:18px;font-family:inherit}
.box .icon{border-color:transparent}
.icon.send{background:var(--blue);color:#fff;border-color:var(--blue)}
.icon.mic.rec{background:#ef4444;color:#fff;border-color:#ef4444;animation:pulse 1.2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(239,68,68,.4)}100%{box-shadow:0 0 0 12px rgba(239,68,68,0)}}
.tools{max-width:860px;margin:8px auto 0;display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:13px;color:var(--muted)}
.flag{background:transparent;border:1px solid var(--line);color:var(--fg);padding:6px 10px;border-radius:999px;font-size:13px;font-weight:600;cursor:pointer;font-family:inherit;white-space:nowrap}
.offline{min-height:60dvh;display:grid;place-items:center;text-align:center;padding:40px 16px}
.offline .avatar{margin:0 auto 16px;filter:grayscale(1);opacity:.7}
.offline h2{font-size:26px;margin-bottom:6px}
.offline p{color:var(--muted);margin:0 0 6px}
.offline p b{color:var(--fg)}
.preview-bar{position:sticky;top:0;z-index:6;display:flex;gap:6px;justify-content:center;align-items:center;flex-wrap:wrap;padding:7px;font-size:12px;background:#111;color:#fff}
.preview-bar button{font:inherit;border:1px solid rgba(255,255,255,.35);background:transparent;border-radius:999px;padding:3px 10px;cursor:pointer;color:inherit;font-weight:600}
.preview-bar button.on{background:#fff;color:#111}
.hidden{display:none !important}