:root { --bg: #fafafa; --card: #fff; --fg: #0a0a0a; --fg2: #555; --fg3: #8a8a8a; --line: #e6e6e4; --r: 14px; color-scheme: light; }
@media (prefers-color-scheme: dark) { :root { --bg: #0a0a0a; --card: #141414; --fg: #f4f4f3; --fg2: #a6a6a3; --fg3: #6e6e6b; --line: #262626; color-scheme: dark; } }
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--fg); font: 15px/1.5 Inter, system-ui, sans-serif; }
button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: 0; background: none; }
[hidden] { display: none !important; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 750; letter-spacing: .1em; }
.logo span { width: 30px; height: 30px; border-radius: 9px; background: var(--fg); color: var(--bg); display: grid; place-items: center; letter-spacing: 0; }
.login { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.login__box { width: 100%; max-width: 380px; background: var(--card); border: 1px solid var(--line); border-radius: 22px; padding: 32px; display: grid; gap: 14px; }
.login__box h1 { margin: 10px 0 0; font-size: 26px; letter-spacing: -.03em; }
.login__box p { margin: 0; color: var(--fg2); }
.login__box label { display: grid; gap: 6px; font-size: 14px; font-weight: 550; }
input, textarea { border: 1px solid var(--line); border-radius: 12px; background: var(--bg); padding: 12px 14px; outline: none; }
input:focus, textarea:focus { border-color: var(--fg); }
.login__box button, .send { height: 46px; border-radius: 999px; background: var(--fg); color: var(--bg); font-weight: 600; padding: 0 22px; }
.err { color: #ef4444 !important; font-size: 14px; }
.app { display: grid; grid-template-columns: 340px 1fr; height: 100%; }
.side { border-right: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; background: var(--card); }
.side__head { display: flex; align-items: center; gap: 8px; padding: 14px; border-bottom: 1px solid var(--line); }
.me { margin-left: auto; font-size: 13px; color: var(--fg3); }
.icon { width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--line); display: grid; place-items: center; font-size: 16px; flex: none; }
.icon.is-rec { background: #ef4444; border-color: #ef4444; }
.search { margin: 10px; }
.convs { list-style: none; margin: 0; padding: 0 6px 10px; overflow-y: auto; flex: 1; }
.convs li { padding: 12px; border-radius: 12px; cursor: pointer; display: grid; grid-template-columns: 40px 1fr auto; gap: 10px; align-items: center; }
.convs li:hover { background: var(--bg); }
.convs li.is-on { background: var(--fg); color: var(--bg); }
.convs li.is-on small { color: inherit; opacity: .7; }
.convs li.is-closed { opacity: .55; }
.av { width: 40px; height: 40px; border-radius: 12px; background: var(--line); display: grid; place-items: center; font-weight: 650; }
.convs strong { display: block; font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.convs small { display: block; color: var(--fg3); font-size: 12.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.convs .badge { min-width: 22px; height: 22px; border-radius: 999px; background: #22c55e; color: #fff; font-size: 12px; font-weight: 700; display: grid; place-items: center; padding: 0 6px; }
.convs .ringing { animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .4; } }
.main { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.empty { margin: auto; color: var(--fg3); }
.thread { display: flex; flex-direction: column; height: 100%; min-height: 0; }
.thread__head { display: flex; align-items: center; gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--line); background: var(--card); }
.thread__head > div { flex: 1; min-width: 0; }
.thread__head small { display: block; color: var(--fg3); font-size: 12.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.btn-ghost { border: 1px solid var(--line); border-radius: 999px; padding: 8px 14px; font-size: 13px; }
.back { display: none; }
.msgs { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 8px; }
.msg { max-width: 70%; padding: 10px 14px; border-radius: 18px; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg small { display: block; font-size: 11px; opacity: .6; margin-top: 2px; }
.msg.visitor { align-self: flex-start; background: var(--card); border: 1px solid var(--line); border-bottom-left-radius: 6px; }
.msg.agent { align-self: flex-end; background: var(--fg); color: var(--bg); border-bottom-right-radius: 6px; }
.msg.system { align-self: center; font-size: 12.5px; color: var(--fg3); padding: 2px; }
.msg audio { display: block; max-width: 240px; height: 36px; }
.typing { padding: 0 20px 6px; font-size: 13px; color: var(--fg3); }
.composer { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--line); background: var(--card); align-items: flex-end; }
.composer textarea { flex: 1; resize: none; max-height: 160px; }
.ring { position: fixed; inset: 0; background: rgba(0,0,0,.55); display: grid; place-items: center; z-index: 10; padding: 16px; }
.ring__box { background: var(--fg); color: var(--bg); border-radius: 26px; padding: 36px 32px; width: 100%; max-width: 340px; text-align: center; display: grid; gap: 10px; justify-items: center; }
.ring__av { width: 90px; height: 90px; border-radius: 30px; background: var(--bg); display: grid; place-items: center; font-size: 38px; animation: pulse 1.2s infinite; }
.ring__box small { opacity: .75; }
.ring__btns { display: flex; gap: 12px; margin-top: 12px; }
.ring__btns button { padding: 12px 22px; border-radius: 999px; font-weight: 650; }
.accept { background: #22c55e; color: #fff; }
.decline { background: #ef4444; color: #fff; }
.mute { background: var(--bg); color: var(--fg); }
@media (max-width: 760px) {
  .app { grid-template-columns: 1fr; }
  .app.has-thread .side { display: none; }
  .app:not(.has-thread) .main { display: none; }
  .back { display: grid; }
  .msg { max-width: 85%; }
}
.logo .mark { width: 30px; height: 30px; object-fit: contain; }
.logo .mark--dark { display: none; }
@media (prefers-color-scheme: dark) { .logo .mark { display: none; } .logo .mark--dark { display: block; } }
.msg.bot { align-self: flex-end; background: transparent; color: var(--fg); border: 1px dashed var(--fg3); border-bottom-right-radius: 6px; }
.mode { font-size: 11px; margin-left: 4px; }
#modeBtn.is-off { opacity: .7; }
.convs li.needs { box-shadow: inset 3px 0 0 #f59e0b; }
.banner { position: fixed; top: 14px; left: 50%; transform: translateX(-50%); background: #f59e0b; color: #111; padding: 10px 18px; border-radius: 999px; font-weight: 600; font-size: 14px; z-index: 20; cursor: pointer; box-shadow: 0 10px 30px rgba(0,0,0,.3); }