:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --ink: #1c2333;
  --muted: #7a8295;
  --accent: #5b6cff;
  --accent-ink: #ffffff;
  --bubble-me: #5b6cff;
  --bubble-them: #eef0f6;
  --radius: 18px;
  --border: #e7e9f0;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 999px;
  padding: 10px 18px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}
button.secondary {
  background: var(--bubble-them);
  color: var(--ink);
}
button:disabled { opacity: 0.5; cursor: default; }

input, textarea {
  font: inherit;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  background: #fff;
  color: var(--ink);
  width: 100%;
}
input:focus, textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }

/* ---- centered card layout (join / fallback) ---- */
.center {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 28px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 12px 40px rgba(20, 30, 80, 0.06);
}
.card h1 { margin: 0 0 6px; font-size: 24px; }
.card p { margin: 0 0 18px; color: var(--muted); }
.card .row { display: flex; gap: 10px; margin-top: 14px; }

/* ---- chat ---- */
.chat {
  display: flex;
  flex-direction: column;
  height: 100%;
  max-width: 720px;
  margin: 0 auto;
  background: var(--panel);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}
.chat header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--panel);
}
.chat header .title { font-weight: 700; }
.chat header .who { color: var(--muted); font-size: 13px; }

#feed {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.msg { display: flex; flex-direction: column; max-width: 78%; margin-top: 10px; }
.msg .name { font-size: 12px; color: var(--muted); margin: 0 6px 3px; }
.msg .bubble {
  padding: 9px 13px;
  border-radius: var(--radius);
  background: var(--bubble-them);
  line-height: 1.35;
  word-wrap: break-word;
  white-space: pre-wrap;
}
.msg.me { align-self: flex-end; align-items: flex-end; }
.msg.me .bubble { background: var(--bubble-me); color: #fff; border-bottom-right-radius: 6px; }
.msg.them .bubble { border-bottom-left-radius: 6px; }
.msg .time { font-size: 11px; color: var(--muted); margin: 3px 6px 0; }

.composer {
  display: flex;
  gap: 10px;
  padding: 14px;
  border-top: 1px solid var(--border);
  background: var(--panel);
}
.composer input { border-radius: 999px; }

.banner {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  padding: 6px;
}
.banner.warn { color: #b4530a; }

/* ---- admin ---- */
.admin { max-width: 760px; margin: 0 auto; padding: 24px; }
.admin h1 { margin: 0 0 4px; }
.admin .sub { color: var(--muted); margin: 0 0 24px; }
.admin section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  margin-bottom: 18px;
}
.admin section h2 { margin: 0 0 12px; font-size: 16px; }
.invite {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.invite:first-of-type { border-top: none; }
.invite .meta { flex: 1; min-width: 0; }
.invite .meta .label { font-weight: 600; }
.invite .meta .status { font-size: 12px; color: var(--muted); }
.invite .status.revoked { color: #c2410c; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }
.key-box {
  background: var(--bubble-them);
  border-radius: 12px;
  padding: 12px;
  word-break: break-all;
  margin: 10px 0;
}
.hidden { display: none !important; }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 999px;
  font-size: 14px; opacity: 0; transition: opacity .2s; pointer-events: none;
}
.toast.show { opacity: 1; }