:root {
  --bg: #0b1020;
  --card: #151c33;
  --muted: #95a2c6;
  --text: #f3f6ff;
  --primary: #4c7dff;
  --border: #283250;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, sans-serif;
  background: linear-gradient(180deg, #080d1a 0%, #0b1020 100%);
  color: var(--text);
}
.container { max-width: 1080px; margin: 0 auto; padding: 1rem; }
.topbar { display: flex; justify-content: space-between; align-items: center; }
.logo { font-weight: 700; }
.hero { margin-top: 2rem; text-align: center; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
.card {
  background: rgba(21, 28, 51, 0.95);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.2rem;
  margin-bottom: 1rem;
}
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.center { text-align: center; }
.btn {
  display: inline-block;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  background: transparent;
  border-radius: 12px;
  padding: .7rem 1rem;
  cursor: pointer;
}
.btn-primary { background: var(--primary); border-color: var(--primary); }
.footer { color: var(--muted); padding-bottom: 2rem; }
.auth-wrap { margin-top: 4rem; }
.error { color: #ff7f8f; }

.cabinet-grid { display: grid; grid-template-columns: 320px 1fr; gap: 1rem; }
.inline { display: flex; gap: .5rem; }
input {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #10172d;
  color: var(--text);
  padding: .65rem .8rem;
}
small { color: var(--muted); }
.messages {
  min-height: 360px;
  max-height: 55vh;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: .75rem;
  margin-bottom: .8rem;
  background: #10172d;
}
.msg {
  border-radius: 10px;
  padding: .55rem .7rem;
  margin-bottom: .5rem;
  max-width: 80%;
}
.msg.user { margin-left: auto; background: #2a4daa; }
.msg.admin { background: #27304b; }
.meta { display: block; font-size: .72rem; color: var(--muted); margin-top: .2rem; }
.admin-grid { display: grid; grid-template-columns: 280px 1fr; gap: 1rem; }
#dialogs { list-style: none; margin: 0; padding: 0; }
#dialogs li { border: 1px solid var(--border); border-radius: 8px; padding: .6rem; margin-bottom: .5rem; cursor: pointer; }
#dialogs li.active { border-color: var(--primary); }
.hidden { display: none; }

@media (max-width: 860px) {
  .grid-3, .cabinet-grid, .admin-grid { grid-template-columns: 1fr; }
}