:root {
  --bg: #0b1220;
  --panel: #101a2e;
  --line: #1d2c47;
  --ink: #dce8ff;
  --dim: #7d8fb0;
  --lake: #4fd8eb;
  --lake-deep: #1789a8;
  --me-bubble: #14384a;
  --peer-bubble: #1a2540;
}

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

html, body { height: 100%; }

body {
  display: flex;
  flex-direction: column;
  background: radial-gradient(1200px 600px at 70% -10%, #14263f 0%, var(--bg) 55%);
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(16, 26, 46, 0.7);
}

.brand { display: flex; align-items: baseline; gap: 10px; }

.lake-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--lake);
  box-shadow: 0 0 12px var(--lake);
  align-self: center;
}

h1 { font-size: 16px; font-weight: 600; letter-spacing: 1px; }
.sub { font-size: 11px; color: var(--dim); }

.who { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--dim); }

.conn { width: 9px; height: 9px; border-radius: 50%; background: #5a6a8a; }
.conn.on { background: #58e6a8; box-shadow: 0 0 8px #58e6a8; }
.conn.off { background: #e6645a; }

main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

#stream {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.msg { max-width: 72%; padding: 9px 13px; border-radius: 12px; font-size: 14px; line-height: 1.5; word-break: break-word; }
.msg .meta { display: block; font-size: 11px; color: var(--dim); margin-bottom: 3px; }
.msg.me { align-self: flex-end; background: var(--me-bubble); border: 1px solid #1f4f66; border-bottom-right-radius: 3px; }
.msg.peer { align-self: flex-start; background: var(--peer-bubble); border: 1px solid var(--line); border-bottom-left-radius: 3px; }
.msg .tick { color: var(--dim); font-size: 11px; margin-left: 6px; }
.msg .tick.ok { color: #58e6a8; }
.msg.sys { align-self: center; background: none; border: none; color: var(--dim); font-size: 12px; }

#status-line {
  min-height: 22px;
  padding: 2px 18px;
  font-size: 12px;
  color: var(--dim);
}
#status-line.err { color: #e6645a; }

footer {
  display: flex;
  gap: 10px;
  padding: 12px 18px;
  border-top: 1px solid var(--line);
  background: rgba(16, 26, 46, 0.7);
}

input {
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
}
input:focus { border-color: var(--lake-deep); }
#peer { width: 150px; }
#text { flex: 1; }

button {
  background: linear-gradient(135deg, var(--lake-deep), #0e6d86);
  color: #eafcff;
  border: none;
  border-radius: 8px;
  padding: 10px 22px;
  font-size: 14px;
  cursor: pointer;
}
button:hover { filter: brightness(1.15); }
button:disabled { opacity: 0.5; cursor: default; }