:root { --bg:#090d18; --card:#111a2a; --line:#24344d; --text:#edf3ff; --muted:#93a6c2; --accent:#5cc8ff; --accent2:#a58aff; color-scheme:dark; }
* { box-sizing:border-box; }
html, body { margin:0; }
body { font-family:Inter, system-ui, -apple-system, sans-serif; color:var(--text); min-height:100vh; display:flex; flex-direction:column;
  background:radial-gradient(ellipse at 50% -10%, #1a3360 0%, transparent 60%), var(--bg); }
.hidden { display:none !important; }

#snow { position:fixed; inset:0; pointer-events:none; overflow:hidden; z-index:0; }
#snow i { position:absolute; top:-20px; color:#fff; font-style:normal; animation:fall linear infinite; }
@keyframes fall { to { transform:translateY(110vh) rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { #snow { display:none; } }

header, main, footer { position:relative; z-index:1; }
header { display:flex; justify-content:space-between; align-items:center; gap:12px; padding:20px 24px; max-width:1100px; width:100%; margin:0 auto; }
.brand { color:#fff; text-decoration:none; font-weight:900; letter-spacing:2px; }
.brand span { color:var(--accent); }
.pill { font-size:13px; color:var(--muted); background:var(--card); border:1px solid var(--line); padding:6px 12px; border-radius:99px; white-space:nowrap; }
.pill i { display:inline-block; width:8px; height:8px; border-radius:50%; background:#48e4a0; margin-right:6px; box-shadow:0 0 8px #48e4a0; }
.pill b { color:var(--text); margin-right:4px; }

main { flex:1; width:100%; max-width:1100px; margin:0 auto; padding:0 24px; }
.hero { text-align:center; padding:60px 0 30px; }
.eyebrow { color:var(--accent); font-size:11px; letter-spacing:3px; font-weight:700; margin:0; }
h1 { font-size:clamp(44px, 9vw, 80px); line-height:1.05; letter-spacing:-3px; margin:18px 0; }
h1 span { background:linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip:text; background-clip:text; color:transparent; }
.sub { color:var(--muted); }

.card { background:var(--card); border:1px solid var(--line); border-radius:16px; }
.join { max-width:520px; margin:20px auto 60px; padding:24px; display:grid; gap:14px; }
input { width:100%; padding:13px 14px; border:1px solid var(--line); border-radius:10px; background:#0b1321; color:var(--text); font:inherit; }
input:focus { outline:2px solid var(--accent); outline-offset:1px; }
button { cursor:pointer; border:0; border-radius:10px; padding:12px 18px; background:var(--accent); color:#06121f; font:inherit; font-weight:700; }
button:hover { filter:brightness(1.1); }

.rooms { display:grid; grid-template-columns:1fr 1fr; gap:8px; }
.rooms label { position:relative; }
.rooms input { position:absolute; opacity:0; width:1px; height:1px; }
.rooms span { display:block; padding:12px; border:1px solid var(--line); border-radius:10px; text-align:center; cursor:pointer; background:#0b1321; }
.rooms input:checked + span { border-color:var(--accent); background:#12304a; }
.rooms input:focus-visible + span { outline:2px solid var(--accent); }

#chat { display:grid; grid-template-columns:220px 1fr; gap:16px; padding-bottom:20px; }
.side h3 { font-size:11px; letter-spacing:2px; color:var(--muted); text-transform:uppercase; margin:8px 0 10px; }
#room-list { display:grid; gap:6px; margin-bottom:24px; }
#room-list button { background:transparent; color:var(--text); text-align:left; font-weight:500; border:1px solid transparent; }
#room-list button.active { background:var(--card); border-color:var(--line); }
#user-list { list-style:none; padding:0; margin:0; font-size:14px; display:grid; gap:6px; }
#user-list li::before { content:"● "; color:#48e4a0; font-size:10px; }

.room { padding:18px; display:flex; flex-direction:column; height:calc(100vh - 150px); min-height:420px; }
.room-head { display:flex; justify-content:space-between; align-items:baseline; gap:12px; }
.room-head h2 { margin:0; font-size:20px; }
#typing { color:var(--muted); font-size:12px; font-style:italic; }
#messages { flex:1; overflow-y:auto; margin:14px 0; padding:12px; background:#0b1321; border-radius:12px; }
.msg { margin:0 0 10px; overflow-wrap:anywhere; }
.msg strong { margin-right:8px; }
.msg time { color:#6a7d98; font-size:11px; }
.msg p { margin:2px 0 0; line-height:1.45; }
.msg.system { color:#7f93b0; font-size:12px; text-align:center; }
.msg.action { color:#c5b6ff; font-style:italic; }
.msg.mention { background:#1b2c48; border-left:3px solid var(--accent); padding:6px 8px; border-radius:6px; }
.file { display:flex; flex-direction:column; gap:6px; margin-top:6px; padding:10px; border:1px solid var(--line); border-radius:10px; color:var(--accent); text-decoration:none; max-width:280px; }
.file img { max-width:100%; max-height:200px; border-radius:6px; object-fit:cover; }

.reactions { display:flex; gap:6px; margin-bottom:10px; }
.reactions button { background:#1c2a40; padding:6px 10px; font-size:18px; }
#send-form { display:flex; gap:8px; }
#send-form input { min-width:0; }
.attach { display:grid; place-items:center; width:48px; flex:none; border:1px solid var(--line); border-radius:10px; cursor:pointer; font-size:18px; }
#upload-status { font-size:13px; color:var(--muted); min-height:18px; margin-top:8px; }

#drop { position:fixed; inset:0; z-index:10; display:grid; place-items:center; background:rgba(9,13,24,.85); border:3px dashed var(--accent); font-size:28px; font-weight:700; }
#floaters { position:fixed; inset:0; pointer-events:none; z-index:5; overflow:hidden; }
.floater { position:absolute; bottom:-40px; font-size:34px; animation:float 3s ease-out forwards; }
@keyframes float { to { transform:translateY(-70vh) scale(1.4); opacity:0; } }

footer { text-align:center; color:#6a7d98; font-size:12px; padding:20px; }

@media (max-width:760px) {
  #chat { grid-template-columns:1fr; }
  .side { order:2; }
  #room-list { grid-template-columns:1fr 1fr; }
  .room { height:72vh; }
  header { padding:16px; }
  main { padding:0 16px; }
}