:root {
  --bg: #0b0d10;
  --panel: #12151a;
  --panel-2: #171b21;
  --panel-3: #1d222a;
  --border: #232833;
  --border-strong: #303a49;
  --text: #e8eaed;
  --muted: #8b93a1;
  --faint: #5b6472;
  --accent: #4ade80;
  --accent-strong: #22c55e;
  --accent-dim: rgba(74, 222, 128, 0.12);
  --danger: #f87171;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.mono { font-family: var(--mono); }
b { font-weight: 600; }

/* ---------------- landing ---------------- */
.landing {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 20px;
}
.brand { display: flex; align-items: center; justify-content: center; margin-bottom: 6px; }
.brand .mark { height: 48px; width: auto; }
.brand h1 {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}
.tagline { color: var(--muted); font-size: 13px; margin: 0 0 34px; text-align: center; }
.tagline code {
  font-family: var(--mono);
  background: var(--panel-2);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--text);
  font-size: 12px;
}

.rooms {
  width: 100%;
  max-width: 760px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-bottom: 26px;
}
.room-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  cursor: pointer;
  transition: border-color .12s, background .12s;
  color: var(--text);
}
.room-card:hover { border-color: var(--border-strong); background: var(--panel-2); }
.room-card .name {
  font-family: var(--mono); font-size: 13px;
  min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.room-card .name::before { content: "/"; color: var(--faint); }
.room-card .count {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 11px; color: var(--muted);
  white-space: nowrap; flex-shrink: 0;
  font-family: var(--mono);
}
.room-card .count::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.room-card .count.zero::before { background: var(--faint); box-shadow: none; }

.join { width: 100%; max-width: 760px; display: flex; gap: 8px; }
.join input {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 13px;
  outline: none;
}
.join input:focus { border-color: var(--border-strong); }
.join button {
  background: var(--accent);
  color: #06210f;
  border: 0;
  border-radius: 8px;
  padding: 10px 18px;
  font-weight: 600;
  cursor: pointer;
}
.join button:hover { background: var(--accent-strong); }

/* ---------------- chat ---------------- */
.chat { height: 100vh; height: 100dvh; display: flex; flex-direction: column; }

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.back {
  background: none; border: 1px solid var(--border);
  color: var(--muted); border-radius: 7px;
  padding: 4px 10px; cursor: pointer;
  font-family: var(--mono); font-size: 13px; line-height: 1.4;
}
.back:hover { color: var(--text); border-color: var(--border-strong); text-decoration: none; }
.room-label { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.room-label b { color: var(--text); }
.spacer { flex: 1; }

.status { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); }
.status .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.status.offline .dot { background: var(--danger); }
.status.connecting .dot { background: var(--faint); }

.topbar input.nick {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  padding: 6px 10px;
  font-family: var(--mono);
  font-size: 12px;
  outline: none;
  width: 120px;
}
.topbar input.nick:focus { border-color: var(--border-strong); }

.icon-btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 7px;
  padding: 6px 10px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 12px;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); }
.icon-btn.on { color: var(--accent); border-color: var(--accent); background: var(--accent-dim); }

.layout { flex: 1; display: flex; min-height: 0; }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.msg .head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 2px; }
.msg .time { font-family: var(--mono); font-size: 11px; color: var(--faint); }
.msg .nick { font-weight: 600; font-size: 13px; }
.msg .body { word-wrap: break-word; overflow-wrap: anywhere; color: #d7dbe1; }
.msg .body.plain { white-space: pre-wrap; }
.msg .body p { margin: 0 0 6px; }
.msg .body p:last-child { margin-bottom: 0; }
.msg .body a { color: var(--accent); }
.msg .body code {
  font-family: var(--mono); font-size: 12.5px;
  background: var(--panel-3); padding: 1px 5px; border-radius: 4px;
  color: #cfe9d8;
}
.msg .body pre {
  position: relative;
  background: #0a0c0f;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
  margin: 8px 0;
}
.msg .body pre code { background: none; padding: 0; color: #dbe4dd; font-size: 12.5px; }
.msg .body blockquote { border-left: 3px solid var(--accent); margin: 8px 0; padding: 2px 12px; color: var(--muted); }
.msg .body ul, .msg .body ol { padding-left: 22px; margin: 6px 0; }

.sys { text-align: center; color: var(--faint); font-size: 12px; font-family: var(--mono); }

.file-card {
  display: flex; align-items: center; gap: 12px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 8px; padding: 10px 12px; margin-top: 4px;
  max-width: 440px;
}
.file-card .ficon {
  width: 34px; height: 34px; border-radius: 6px; background: var(--panel-3);
  display: grid; place-items: center; color: var(--muted);
  font-family: var(--mono); font-size: 12px; flex-shrink: 0;
}
.file-card .fmeta { flex: 1; min-width: 0; }
.file-card .fname { font-size: 13px; font-weight: 600; word-break: break-all; }
.file-card .fsize { font-size: 11px; color: var(--muted); font-family: var(--mono); }
.file-card a { font-family: var(--mono); font-size: 12px; white-space: nowrap; }
.file-card .cancel {
  background: none; border: 1px solid var(--border); color: var(--danger);
  border-radius: 6px; padding: 4px 8px; font-size: 11px; cursor: pointer; white-space: nowrap;
}
.file-card .cancel:hover { border-color: var(--danger); }
.file-card.dead { opacity: 0.45; }

.copy-btn {
  position: absolute; top: 6px; right: 6px;
  background: var(--panel-3); border: 1px solid var(--border);
  color: var(--muted); border-radius: 5px; padding: 2px 8px;
  font-size: 10px; cursor: pointer; font-family: var(--mono);
}
.copy-btn:hover { color: var(--text); }

/* users panel */
.users {
  width: 220px;
  background: var(--panel);
  border-left: 1px solid var(--border);
  display: flex; flex-direction: column;
  min-height: 0;
}
.users header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.users header h2 {
  margin: 0; font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .05em; color: var(--muted);
}
.users header .n { font-family: var(--mono); font-size: 12px; color: var(--faint); }
.users header .u-right { display: flex; align-items: center; gap: 8px; }
.users-close {
  background: none; border: 1px solid var(--border); color: var(--muted);
  border-radius: 6px; width: 24px; height: 24px; line-height: 1;
  cursor: pointer; font-size: 16px; padding: 0;
}
.users-close:hover { color: var(--text); border-color: var(--border-strong); }
.users-backdrop { display: none; }
.users ul { list-style: none; margin: 0; padding: 8px; overflow-y: auto; }
.users li {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 8px; border-radius: 6px;
  font-family: var(--mono); font-size: 12.5px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.users li::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0;
}

/* composer */
.composer { background: var(--panel); border-top: 1px solid var(--border); padding: 10px 14px; }
.toolbar { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.toolbar select {
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 7px;
  color: var(--text); padding: 5px; font-size: 12px; font-family: var(--mono); outline: none;
}
.upload-progress { margin-bottom: 6px; font-size: 12px; color: var(--accent); font-family: var(--mono); }
.input-row { display: flex; gap: 8px; align-items: flex-end; }
.input-row textarea {
  flex: 1; resize: none; max-height: 160px;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); padding: 10px 12px; outline: none; font: inherit;
}
.input-row textarea:focus { border-color: var(--border-strong); }
.send {
  background: var(--accent); color: #06210f; border: 0; border-radius: 8px;
  padding: 10px 18px; font-weight: 600; cursor: pointer;
}
.send:hover { background: var(--accent-strong); }
.hint { margin-top: 6px; font-size: 11px; color: var(--faint); }

/* modal */
.overlay {
  position: fixed; inset: 0; background: rgba(4,6,9,.66);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.modal {
  width: 100%; max-width: 360px;
  background: var(--panel); border: 1px solid var(--border-strong);
  border-radius: 10px; padding: 22px;
}
.modal h2 { margin: 0 0 4px; font-size: 16px; font-weight: 600; }
.modal p { margin: 0 0 16px; color: var(--muted); font-size: 13px; }
.modal input {
  width: 100%; background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); padding: 10px 12px;
  font-family: var(--mono); font-size: 13px; outline: none; margin-bottom: 14px;
}
.modal input:focus { border-color: var(--accent); }
.modal .actions { display: flex; justify-content: flex-end; gap: 8px; }
.modal .ghost { background: none; border: 1px solid var(--border); color: var(--muted); border-radius: 8px; padding: 9px 14px; cursor: pointer; }
.modal .ghost:hover { color: var(--text); border-color: var(--border-strong); }
.modal .primary { background: var(--accent); color: #06210f; border: 0; border-radius: 8px; padding: 9px 16px; font-weight: 600; cursor: pointer; }
.modal .primary:hover { background: var(--accent-strong); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }

/* ---------------- responsive / móvil ---------------- */
@media (max-width: 768px) {
  .landing { padding: 28px 14px; }
  .brand .mark { height: 40px; }
  .tagline { margin-bottom: 22px; }
  .rooms { grid-template-columns: repeat(2, 1fr); gap: 8px; }

  .topbar { gap: 8px; padding: 8px 10px; }
  .room-label { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .topbar input.nick { width: 84px; }
  #status-text { display: none; }

  .messages { padding: 12px; }

  .users {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: 82vw; max-width: 280px;
    z-index: 40;
    box-shadow: -12px 0 30px rgba(0, 0, 0, .45);
  }
  .users-backdrop {
    display: block;
    position: fixed; inset: 0;
    background: rgba(0, 0, 0, .5);
    z-index: 39;
  }

  .composer { padding: 8px 10px; }
  .toolbar { gap: 6px; flex-wrap: wrap; }
  .icon-btn { padding: 8px 10px; }
  .send { padding: 10px 16px; }

  .overlay { padding: 16px; }
  .modal { max-width: 100%; }
}

@media (max-width: 400px) {
  .topbar input.nick { width: 64px; }
  .back { padding: 4px 8px; }
  .room-label { max-width: 30vw; }
}