:root{
  --bg: #0a0e14;
  --bg-panel: #10151d;
  --bg-card: #161c26;
  --bg-hover: #1c2330;
  --border: #242c3a;
  --text: #e7eaf2;
  --text-dim: #8d96ab;
  --accent: #22c7d4;
  --accent-dim: #1a9ca6;
  --accent-soft: rgba(34,199,212,0.14);
  --good: #3ecf8e;
  --warn: #f0b84f;
  --danger: #ef5a6c;
  --radius: 14px;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;height:100%;}
body{
  background:var(--bg); color:var(--text);
  font-family:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height:1.5;
}
a{color:var(--accent);}
h1,h2,h3,h4{line-height:1.25; margin:0 0 .5em;}
.hidden{display:none !important;}
button{font-family:inherit;}

/* ---------- Topbar ---------- */
.topbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 20px; border-bottom:1px solid var(--border);
  background:var(--bg-panel);
}
.topbar-left{ display:flex; align-items:center; gap:12px; flex-wrap:wrap; }
.brand{display:flex; align-items:center; gap:10px; font-weight:700; font-size:18px;}
.brand .logo{font-size:22px;}
.topbar-divider{color:var(--border); font-size:16px;}
.lgst-back-link{
  display:flex; align-items:center; gap:6px; color:var(--text-dim);
  font-size:13px; font-weight:600; text-decoration:none;
}
.lgst-back-link:hover{color:var(--accent);}
.lgst-back-link svg{width:14px;height:14px;}
.topbar-actions{display:flex; align-items:center; gap:10px; flex-wrap:wrap;}
.user-pill{font-size:13px; color:var(--text-dim); padding:6px 10px; border:1px solid var(--border); border-radius:999px;}

/* ---------- Buttons / inputs ---------- */
.btn{
  background:var(--accent); color:#06242a; border:none; border-radius:10px;
  padding:10px 16px; font-size:14px; font-weight:700; cursor:pointer;
  transition:background .15s; text-decoration:none; display:inline-block;
}
.btn:hover{background:var(--accent-dim); color:#fff;}
.btn.ghost{background:transparent; border:1px solid var(--border); color:var(--text);}
.btn.ghost:hover{border-color:var(--accent); background:transparent;}
.btn.small{padding:6px 10px; font-size:12px;}
.btn:disabled{opacity:.6; cursor:default;}
.text-input{
  width:100%; padding:10px 12px; border-radius:10px; border:1px solid var(--border);
  background:var(--bg-card); color:var(--text); font-size:14px; margin-bottom:10px;
}
.text-input:focus{outline:none; border-color:var(--accent);}

/* ---------- Landing ---------- */
.hero{max-width:780px; margin:0 auto; padding:60px 20px 20px; text-align:center;}
.hero h1{font-size:32px;}
.hero .tag{color:var(--text-dim); font-size:16px; max-width:580px; margin:14px auto 0;}
.gate-card{
  max-width:380px; margin:32px auto 0; background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:22px;
}
.gate-card h3{font-size:16px; margin-bottom:4px;}
.gate-card p.desc{color:var(--text-dim); font-size:13px; margin:0 0 14px;}
.gate-error{color:var(--danger); font-size:13px; min-height:18px; margin-top:4px;}
.gate-switch{margin:12px 0 0; font-size:13px; color:var(--text-dim); text-align:center;}
.gate-switch a{cursor:pointer; text-decoration:none;}
.gate-switch a:hover{text-decoration:underline;}

/* ---------- Paywall ---------- */
.paywall-wrap{max-width:420px; margin:60px auto; padding:0 20px; text-align:center;}
.paywall-box{
  background:var(--bg-card); border:1px solid var(--accent); border-radius:var(--radius);
  padding:28px 24px;
}
.paywall-price{font-size:30px; font-weight:800; color:var(--accent); margin:14px 0 4px;}
.paywall-price span{font-size:15px; color:var(--text-dim); font-weight:600;}
.paywall-note{font-size:12.5px; color:var(--text-dim); margin:8px 0 20px; line-height:1.5;}
.paywall-features{list-style:none; margin:0 0 20px; padding:0; text-align:left; display:flex; flex-direction:column; gap:9px;}
.paywall-features li{display:flex; gap:8px; font-size:13.5px; color:var(--text-dim);}
.paywall-features li::before{content:"✓"; color:var(--good); font-weight:700;}

/* ---------- Chat app layout ---------- */
.app-layout{display:flex; height:calc(100vh - 57px);}
.sidebar{
  width:280px; flex:0 0 280px; border-right:1px solid var(--border);
  display:flex; flex-direction:column; background:var(--bg-panel); overflow-y:auto;
}
.sidebar-section{padding:14px 10px 6px;}
.sidebar-section-title{
  font-size:11px; font-weight:700; text-transform:uppercase; letter-spacing:.6px;
  color:var(--text-dim); padding:0 10px 6px; display:flex; justify-content:space-between; align-items:center;
}
.sidebar-item{
  display:flex; align-items:center; gap:8px; padding:9px 12px; border-radius:10px; cursor:pointer;
  font-size:14px; color:var(--text-dim); position:relative;
}
.sidebar-item:hover{background:var(--bg-hover); color:var(--text);}
.sidebar-item.active{background:var(--accent-soft); color:var(--text); font-weight:600;}
.sidebar-item .hash{color:var(--text-dim); opacity:.6;}
.sidebar-item .online-dot{width:7px;height:7px;border-radius:50%;background:var(--good); flex:0 0 7px;}
.sidebar-item .offline-dot{width:7px;height:7px;border-radius:50%;background:var(--border); flex:0 0 7px;}
.sidebar-item .del-room-btn{
  margin-left:auto; opacity:0; color:var(--text-dim); font-size:12px; padding:2px 6px; border-radius:6px;
}
.sidebar-item:hover .del-room-btn{opacity:1;}
.sidebar-item .del-room-btn:hover{color:var(--danger); background:rgba(239,90,108,.1);}
.icon-btn{
  background:transparent; border:none; color:var(--text-dim); cursor:pointer; font-size:14px;
  padding:2px 6px; border-radius:6px;
}
.icon-btn:hover{color:var(--accent); background:var(--bg-hover);}

.chat-main{flex:1; display:flex; flex-direction:column; min-width:0;}
.chat-header{
  padding:14px 20px; border-bottom:1px solid var(--border); display:flex; align-items:center; gap:10px;
}
.chat-header h2{font-size:16px; margin:0;}
.chat-header p{margin:0; font-size:12px; color:var(--text-dim);}
.chat-messages{flex:1; overflow-y:auto; padding:16px 20px; display:flex; flex-direction:column; gap:14px;}
.chat-msg{display:flex; gap:10px; max-width:720px;}
.chat-msg .avatar{
  width:34px; height:34px; border-radius:50%; background:var(--bg-card); border:1px solid var(--border);
  display:flex; align-items:center; justify-content:center; font-size:16px; flex:0 0 34px;
}
.chat-msg .msg-body{min-width:0;}
.chat-msg .msg-head{display:flex; align-items:baseline; gap:8px; margin-bottom:2px;}
.chat-msg .msg-author{font-weight:700; font-size:13.5px;}
.chat-msg .msg-time{font-size:11px; color:var(--text-dim);}
.chat-msg .msg-text{font-size:14px; color:var(--text); white-space:pre-wrap; word-break:break-word;}
.chat-msg.own .msg-author{color:var(--accent);}
.chat-empty{color:var(--text-dim); font-size:13px; text-align:center; margin:auto;}

.chat-input-bar{
  padding:14px 20px; border-top:1px solid var(--border); display:flex; gap:10px; align-items:flex-end;
}
.chat-input-bar textarea{
  flex:1; resize:none; min-height:42px; max-height:140px; padding:10px 12px; border-radius:10px;
  border:1px solid var(--border); background:var(--bg-card); color:var(--text); font-size:14px; font-family:inherit;
}
.chat-input-bar textarea:focus{outline:none; border-color:var(--accent);}

/* ---------- Modal (new room) ---------- */
.modal-overlay{
  position:fixed; inset:0; background:rgba(0,0,0,0.6); display:flex; align-items:center; justify-content:center; z-index:100;
}
.modal-box{background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); padding:22px; width:100%; max-width:360px;}
.modal-box h3{margin-bottom:14px; font-size:16px;}
.modal-actions{display:flex; justify-content:flex-end; gap:10px; margin-top:4px;}

@media (max-width:760px){
  .app-layout{flex-direction:column; height:auto;}
  .sidebar{width:100%; flex:none; max-height:40vh; border-right:none; border-bottom:1px solid var(--border);}
  .chat-main{height:60vh;}
  .topbar-left{width:100%; justify-content:space-between;}
}