:root {
  --bg: #08111f;
  --panel: rgba(17, 24, 39, 0.88);
  --panel2: rgba(31, 41, 55, 0.88);
  --line: rgba(148, 163, 184, 0.18);
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #38bdf8;
  --primary2: #a78bfa;
  --danger: #fb7185;
  --ok: #34d399;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, .22), transparent 34%),
    radial-gradient(circle at bottom right, rgba(167, 139, 250, .20), transparent 38%),
    var(--bg);
}
.hidden { display: none !important; }
.app-shell { min-height: 100vh; }
.login-view {
  min-height: 100vh;
  display: grid;
  place-items: center;
  gap: 22px;
  padding: 24px;
}
.brand-card, .login-card, .admin-card {
  width: min(440px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 24px 80px rgba(0,0,0,.35);
  backdrop-filter: blur(18px);
}
.brand-card { text-align: center; }
.brand-logo {
  width: 78px; height: 78px; border-radius: 28px;
  display: inline-grid; place-items: center;
  font-weight: 900; font-size: 25px;
  background: linear-gradient(135deg, var(--primary), var(--primary2));
  color: #061018;
}
h1, h2, h3, p { margin-top: 0; }
p, label, small, span { color: var(--muted); }
label { display: block; margin: 12px 0 8px; font-weight: 700; }
input, select {
  width: 100%; padding: 14px 15px;
  background: rgba(15, 23, 42, .9);
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 14px;
  outline: none;
}
input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(56, 189, 248, .15); }
.pill-group, .avatar-grid { display: flex; gap: 10px; flex-wrap: wrap; }
.pill, .avatar-btn, .ghost-btn, .admin-link {
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, .72);
  color: var(--text);
  border-radius: 14px;
  padding: 10px 13px;
  cursor: pointer;
  text-decoration: none;
}
.pill.active, .avatar-btn.active { border-color: var(--primary); background: rgba(56, 189, 248, .16); }
.primary-btn {
  width: 100%; margin-top: 18px;
  border: none; border-radius: 16px;
  padding: 14px 18px;
  font-weight: 900; cursor: pointer;
  color: #061018;
  background: linear-gradient(135deg, var(--primary), var(--primary2));
}
.error-box {
  margin-top: 12px; padding: 12px;
  border-radius: 14px; background: rgba(251, 113, 133, .14);
  color: #fecdd3; border: 1px solid rgba(251, 113, 133, .25);
}
.chat-view {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 240px;
  height: 100vh;
}
.sidebar, .users-panel, .room-main {
  border-right: 1px solid var(--line);
  background: rgba(8, 17, 31, .72);
  backdrop-filter: blur(18px);
}
.users-panel { border-right: none; border-left: 1px solid var(--line); padding: 20px; overflow: auto; }
.sidebar { padding: 20px; overflow: auto; }
.side-header, .room-header {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding-bottom: 16px; border-bottom: 1px solid var(--line);
}
.room-list { display: grid; gap: 10px; margin-top: 12px; }
.room-item {
  text-align: left; width: 100%; cursor: pointer;
  padding: 14px; border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, .65);
  color: var(--text);
}
.room-item strong { display: block; margin-bottom: 4px; }
.room-main { display: grid; grid-template-rows: auto 1fr auto auto; min-width: 0; }
.room-header { padding: 20px; }
.messages {
  overflow: auto; padding: 20px;
  display: flex; flex-direction: column; gap: 10px;
}
.message, .system-message {
  padding: 10px 12px; border-radius: 14px;
  background: rgba(15, 23, 42, .75);
  border: 1px solid var(--line);
}
.message .nick { color: var(--primary); font-weight: 900; margin-right: 8px; }
.message .nick.root, .message .nick.admin { color: #fbbf24; }
.message .body { color: var(--text); }
.system-message { color: var(--muted); font-style: italic; text-align: center; }
.typing-line { min-height: 22px; padding: 0 20px; color: var(--muted); }
.message-form { display: flex; gap: 10px; padding: 16px 20px 20px; }
.message-form input { flex: 1; }
.message-form button {
  border: none; border-radius: 14px; padding: 0 18px;
  background: var(--primary); font-weight: 900; cursor: pointer;
}
.online-users { display: grid; gap: 8px; }
.online-user {
  display: flex; justify-content: space-between; gap: 8px;
  padding: 10px 12px; border-radius: 14px; background: rgba(15, 23, 42, .65);
  border: 1px solid var(--line);
}
.admin-shell { min-height: 100vh; padding: 24px; }
.admin-login { margin: 40px auto; }
.admin-panel { max-width: 1100px; margin: 0 auto; }
.admin-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 22px; }
.admin-output { background: rgba(0,0,0,.28); border: 1px solid var(--line); border-radius: 14px; padding: 14px; min-height: 80px; overflow: auto; }
@media (max-width: 900px) {
  .chat-view { grid-template-columns: 1fr; grid-template-rows: auto 1fr auto; }
  .sidebar { max-height: 220px; border-right: none; border-bottom: 1px solid var(--line); }
  .users-panel { max-height: 160px; border-left: none; border-top: 1px solid var(--line); }
  .room-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .admin-grid { grid-template-columns: 1fr; }
}