:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --line: #dde3ea;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #0f766e;
  --accent-soft: #f0fdfa;
  --accent-line: #5eead4;
  --danger: #be123c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

main { max-width: 760px; margin: 0 auto; padding: 32px 16px; }

.screen { display: flex; flex-direction: column; align-items: center; }

h1 { font-size: 40px; margin: 24px 0 4px; color: var(--accent); letter-spacing: 4px; }
h2 { font-size: 22px; margin: 0; }
.sub { color: var(--muted); font-size: 14px; margin: 6px 0 20px; }
.code { color: var(--accent); font-weight: 700; letter-spacing: 2px; }
.hint { color: var(--muted); font-size: 13px; max-width: 460px; text-align: center; line-height: 1.7; }

.card {
  width: 100%;
  max-width: 460px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 20px;
}

.tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.tab {
  flex: 1;
  padding: 9px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
}
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

form { display: flex; flex-direction: column; gap: 12px; }
form label { display: flex; flex-direction: column; gap: 5px; font-size: 14px; color: var(--text); }
form input, .row select {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 15px;
  background: #fff;
}
form input:focus, .row select:focus { outline: 2px solid var(--accent-line); border-color: var(--accent); }

button {
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  font-size: 14px;
  cursor: pointer;
}
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 12px 0;
}
button.danger { border-color: #fecaca; color: var(--danger); background: #fff5f5; }
button.toggle.on { background: #fff5f5; border-color: #fca5a5; color: var(--danger); }

.msg { min-height: 20px; font-size: 13px; color: var(--danger); margin: 0; }
.msg.ok { color: var(--accent); }

/* ---- 房间内 ---- */
#screen-room { width: 100%; }
#screen-room header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
}
#screen-room header .sub { margin-bottom: 0; }
.header-actions { display: flex; gap: 8px; flex-shrink: 0; }

.layout { display: flex; flex-direction: column; gap: 16px; width: 100%; }

.members { display: flex; flex-direction: column; gap: 8px; width: 100%; }
.member {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 15px;
}
.member.me-card { border-color: var(--accent-line); background: var(--accent-soft); }
.member .meter {
  flex: 1;
  height: 6px;
  background: #eef1f4;
  border-radius: 3px;
  overflow: hidden;
  max-width: 120px;
}
.member .vbar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 120ms linear;
}
.peer-status { color: var(--muted); font-size: 12px; width: 48px; text-align: right; }

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
}
.panel h3 { margin: 0 0 10px; font-size: 16px; }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.row label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }

@media (max-width: 520px) {
  #screen-room header { flex-direction: column; }
  main { padding: 20px 12px; }
}