:root {
  --bg:      #0a0a0a;
  --surface: #111111;
  --border:  #2a2a2a;
  --accent:  #39d353;
  --text:    #cccccc;
  --muted:   #555555;
  --red:     #cc3333;
  --orange:  #cc8833;
  --green:   #39d353;
  --dim:     #888888;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: "Fira Code", "Cascadia Code", "Consolas", "Menlo", monospace;
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
  line-height: 1.55;
}

/* ── Layout ──────────────────────────────────────────────────────────────── */
.layout { display: flex; height: 100vh; overflow: hidden; }

/* ── Sidebar ─────────────────────────────────────────────────────────────── */
.sidebar {
  width: 220px;
  min-width: 220px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: visible;
}

.sidebar-header {
  padding: 14px 12px 10px;
  border-bottom: 1px solid var(--border);
}
.sidebar-header .logo {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.sidebar-header .logo::before { content: '> '; opacity: 0.5; }
.sidebar-header .tagline {
  font-size: 10px;
  color: var(--muted);
  margin-top: 2px;
  letter-spacing: 0.03em;
}

.ch-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 0;
}

.ch-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  cursor: pointer;
  color: var(--muted);
  font-size: 12px;
  transition: color .1s, background .1s;
  user-select: none;
  border-left: 2px solid transparent;
}
.ch-item:hover  { color: var(--text); background: rgba(255,255,255,.03); }
.ch-item.active { color: var(--accent); border-left-color: var(--accent); background: rgba(57,211,83,.05); }
.ch-item .hash  { color: var(--muted); }
.ch-item .badge {
  margin-left: auto;
  color: var(--muted);
  font-size: 10px;
}

.sidebar-footer {
  padding: 10px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.join-row { display: flex; gap: 4px; }
.join-row input {
  flex: 1;
  min-width: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 8px;
  font-size: 12px;
  font-family: inherit;
  outline: none;
  border-radius: 0;
}
.join-row input::placeholder { color: var(--muted); }
.join-row input:focus { border-color: var(--accent); }
.join-row button {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 5px 10px;
  cursor: pointer;
  font-weight: 700;
  font-size: 12px;
  font-family: inherit;
  flex-shrink: 0;
  white-space: nowrap;
  border-radius: 0;
  letter-spacing: 0.05em;
}
.join-row button:hover { background: rgba(57,211,83,.1); }

/* ── Main ────────────────────────────────────────────────────────────────── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* Welcome screen */
.welcome {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--muted);
  text-align: center;
  padding: 20px;
}
.welcome h1 {
  font-size: 22px;
  color: var(--accent);
  font-weight: 400;
  letter-spacing: 0.1em;
}
.welcome h1::before { content: '$ '; opacity: 0.4; }
.welcome .sub  { font-size: 12px; color: var(--dim); }
.welcome .hint { font-size: 11px; color: var(--muted); margin-top: 4px; }

/* Channel header */
.ch-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
}
.ch-header .ch-hash { font-size: 14px; color: var(--accent); }
.ch-header h2 { font-size: 13px; font-weight: 600; letter-spacing: 0.04em; }
.ch-header .spacer { flex: 1; }
.icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 3px 8px;
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  border-radius: 0;
  letter-spacing: 0.03em;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Messages */
.msg-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.empty-state {
  margin: auto;
  color: var(--muted);
  text-align: center;
  font-size: 12px;
}
.empty-state .icon { font-size: 28px; display: block; margin-bottom: 8px; opacity: .4; }

.msg {
  padding: 4px 6px;
  border-left: 2px solid transparent;
}
.msg:hover { background: rgba(255,255,255,.02); border-left-color: var(--border); }
.msg-head  { display: flex; align-items: baseline; gap: 8px; }
.msg-name  { font-weight: 700; font-size: 12px; color: var(--accent); }
.msg-time  { font-size: 10px; color: var(--muted); }

.ttl-badge {
  font-size: 9px;
  padding: 1px 4px;
  font-weight: 600;
  border: 1px solid;
  letter-spacing: 0.03em;
}
.ttl-short  { border-color: var(--red);    color: var(--red);    }
.ttl-medium { border-color: var(--orange); color: var(--orange); }
.ttl-inf    { border-color: #2a2a2a;       color: var(--muted);  }

.msg-body  { font-size: 12px; white-space: pre-wrap; word-break: break-word; margin-top: 2px; color: var(--text); }
.msg-files { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 5px; }
.file-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: transparent;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--dim);
  font-size: 11px;
  font-family: inherit;
}
.file-link:hover { border-color: var(--accent); color: var(--accent); }
.file-size { color: var(--muted); }

/* Compose */
.compose {
  border-top: 1px solid var(--border);
  padding: 10px 16px;
  background: var(--surface);
  flex-shrink: 0;
}
.compose-top {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 6px;
}
.compose input, .compose select, .compose textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 8px;
  font-size: 12px;
  font-family: inherit;
  outline: none;
  width: 100%;
  border-radius: 0;
}
.compose input::placeholder,
.compose textarea::placeholder { color: var(--muted); }
.compose select option { background: var(--bg); }
.compose input:focus,
.compose select:focus,
.compose textarea:focus { border-color: var(--accent); }
.compose textarea { resize: vertical; min-height: 58px; margin-bottom: 6px; }
.compose-bottom { display: flex; align-items: center; gap: 6px; }
.compose-bottom input[type="file"] { flex: 1; font-size: 11px; color: var(--muted); }

.send-btn {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 20px;
  font-weight: 700;
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: 0.05em;
  border-radius: 0;
}
.send-btn:hover    { background: rgba(57,211,83,.1); }
.send-btn:disabled { opacity: .35; cursor: not-allowed; }

/* Scrollbar */
::-webkit-scrollbar       { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); }

/* Responsive */
@media (max-width: 580px) {
  .sidebar { width: 180px; min-width: 180px; }
  .compose-top { grid-template-columns: 1fr; }
}