:root {
  --accent: #EA2220; --text: #1A1A1A; --muted: #6B6B6B; --line: #DDDDDD;
  --bg: #F7F7F7; --card: #FFFFFF; --me: #FBE3E2; --them: #FFFFFF;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { font-family: Arial, Helvetica, sans-serif; color: var(--text); background: var(--bg); line-height: 1.45; display: flex; flex-direction: column; }
.top { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px; background: var(--card); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 8px; font-weight: bold; }
.dot { width: 12px; height: 12px; background: var(--accent); border-radius: 2px; }
main { flex: 1; width: 100%; max-width: 760px; margin: 0 auto; padding: 16px; display: flex; flex-direction: column; min-height: 0; }
.hidden { display: none !important; }
h1 { font-size: 1.5rem; margin: 8px 0 4px; }
.sub, .muted { color: var(--muted); font-size: .9rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 20px; }
.narrow { max-width: 420px; margin: 40px auto; width: 100%; }
form#fJoin { display: flex; gap: 8px; }
input, textarea { font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 6px; width: 100%; background: #fff; color: var(--text); }
button { font: inherit; cursor: pointer; border: 0; border-radius: 6px; padding: 10px 16px; background: var(--accent); color: #fff; font-weight: bold; }
button:disabled { opacity: .5; cursor: default; }
button.link { background: none; color: var(--muted); padding: 4px 6px; font-weight: normal; text-decoration: underline; }
.err { color: var(--accent); min-height: 1.2em; }
.roles { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: 16px 0; }
.role { text-align: left; background: var(--card); color: var(--text); border: 1px solid var(--line); border-left: 4px solid var(--accent); padding: 14px; font-weight: normal; }
.role:hover { border-color: var(--accent); }
.role strong { display: block; font-size: 1.05rem; }
.role em { display: block; margin-top: 8px; color: var(--muted); font-size: .9rem; }
.tips { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; }
.tips summary { cursor: pointer; font-weight: bold; }
.chatview { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.chathead { display: flex; align-items: center; gap: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.chathead > div:nth-child(2) { flex: 1; }
.toggle { font-size: .85rem; color: var(--muted); display: flex; gap: 4px; align-items: center; }
.toggle input { width: auto; }
.log { flex: 1; overflow-y: auto; padding: 14px 0; display: flex; flex-direction: column; gap: 10px; min-height: 200px; }
.msg { max-width: 85%; padding: 10px 14px; border-radius: 12px; border: 1px solid var(--line); white-space: pre-wrap; }
.msg.them { background: var(--them); align-self: flex-start; border-bottom-left-radius: 2px; }
.msg.me { background: var(--me); border-color: #F3C2C0; align-self: flex-end; border-bottom-right-radius: 2px; }
.msg.sys { align-self: center; border: 0; color: var(--muted); font-size: .85rem; background: none; }
.msg .who { display: block; font-size: .75rem; color: var(--muted); margin-bottom: 2px; }
.typing { color: var(--muted); font-style: italic; }
.ask { display: flex; gap: 8px; align-items: flex-end; padding-top: 10px; border-top: 1px solid var(--line); }
.ask textarea { resize: none; max-height: 140px; }
.mic { background: var(--card); color: var(--text); border: 1px solid var(--line); padding: 10px 12px; }
.mic.on { background: var(--accent); color: #fff; border-color: var(--accent); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .6; } }
.chatfoot { display: flex; justify-content: space-between; align-items: center; padding-top: 6px; flex-wrap: wrap; gap: 4px; }
dialog { border: 1px solid var(--line); border-radius: 8px; max-width: 560px; width: calc(100% - 32px); }
dialog h2 { font-size: 1.1rem; }
dialog li { margin-bottom: 8px; }
@media (max-width: 520px) { .msg { max-width: 92%; } #btnSend { padding: 10px 12px; } }
.brand .course { font-weight: normal; color: var(--muted); font-size: .9rem; margin-left: 4px; }
.brand .course:not(:empty)::before { content: "· "; }