:root{color-scheme:dark;--bg:#0e1113;--panel:#161a1d;--panel2:#1d2226;--border:#2a3034;--text:#e8ecee;--muted:#8a9299;--accent:#3a8bd8;--accent2:#2c6fb0;--danger:#d85a5a;--mine:#264a63;--theirs:#232a2e}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,Segoe UI,Arial,sans-serif;height:100vh;overflow:hidden}
#app{height:100vh;display:flex;flex-direction:column}
.hidden{display:none!important}
.center-screen{max-width:380px;margin:8vh auto;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:28px}
.center-screen h1{font-size:1.3rem;margin:0 0 4px}
.center-screen p.sub{color:var(--muted);font-size:.85rem;margin:0 0 20px}
label{display:block;font-size:.8rem;color:var(--muted);margin:14px 0 4px}
input[type=text],input[type=password]{width:100%;padding:10px;border-radius:8px;border:1px solid var(--border);background:var(--panel2);color:var(--text);font-size:.95rem}
button{cursor:pointer;border:none;border-radius:8px;padding:10px 16px;font-size:.9rem;font-weight:600}
.btn-primary{background:var(--accent);color:#fff;width:100%;margin-top:18px}
.btn-primary:hover{background:var(--accent2)}
.btn-link{background:none;color:var(--accent);padding:4px;font-weight:500;width:100%;margin-top:10px}
.error-msg{color:var(--danger);font-size:.85rem;margin-top:10px;min-height:1em}
.notice{background:#1e2a1e;border:1px solid #33502f;color:#bfe6b8;font-size:.8rem;padding:10px;border-radius:8px;margin-top:12px}
.chat-layout{flex:1;display:flex;min-height:0}
.sidebar{width:260px;border-right:1px solid var(--border);background:var(--panel);display:flex;flex-direction:column}
.sidebar-header{padding:14px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}
.sidebar-header .me{font-weight:600;font-size:.9rem}
.icon-btn{background:none;color:var(--muted);font-size:1rem;padding:4px 8px}
.icon-btn:hover{color:var(--text)}
.user-list{flex:1;overflow-y:auto}
.user-item{padding:12px 14px;cursor:pointer;border-bottom:1px solid var(--border);font-size:.9rem}
.user-item:hover{background:var(--panel2)}
.user-item.active{background:var(--panel2);border-left:3px solid var(--accent)}
.chat-main{flex:1;display:flex;flex-direction:column;min-width:0}
.chat-header{padding:14px;border-bottom:1px solid var(--border);font-weight:600;background:var(--panel)}
.messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:8px}
.msg{max-width:60%;padding:8px 12px;border-radius:12px;font-size:.9rem;line-height:1.35;word-wrap:break-word;white-space:pre-wrap}
.msg.mine{align-self:flex-end;background:var(--mine)}
.msg.theirs{align-self:flex-start;background:var(--theirs)}
.msg .meta{display:block;font-size:.68rem;color:var(--muted);margin-top:3px}
.msg.broken{color:var(--danger);font-style:italic}
.composer{display:flex;gap:8px;padding:12px;border-top:1px solid var(--border);background:var(--panel)}
.composer input{flex:1}
.empty-state{margin:auto;color:var(--muted);font-size:.9rem;text-align:center}
.modal-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:10}
.modal{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:24px;max-width:440px;width:90%}
.modal h2{margin-top:0;font-size:1.1rem}
.modal textarea{width:100%;min-height:90px;background:var(--panel2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:8px;font-family:monospace;font-size:.8rem}
.modal .actions{display:flex;gap:8px;margin-top:14px;justify-content:flex-end}
.btn-secondary{background:var(--panel2);color:var(--text);border:1px solid var(--border)}