:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #1c1f24;
  --muted: #6b7280;
  --border: #e3e6ea;
  --accent: #4f46e5;
  --accent-soft: #eef0ff;
  --ok: #16a34a;
  --bad: #dc2626;
  --warn: #d97706;
  --bubble-bot: #eef0ff;
  --bubble-cust: #f1f3f5;
  --bubble-agent: #fff4e5;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --panel: #1a1d23;
    --text: #e6e8eb;
    --muted: #9aa1ab;
    --border: #2b3038;
    --accent: #818cf8;
    --accent-soft: #252a4a;
    --bubble-bot: #252a4a;
    --bubble-cust: #252930;
    --bubble-agent: #3a2e1a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.tiny { font-size: 11.5px; }
.center { text-align: center; padding: 24px 0; }
.error { color: var(--bad); min-height: 1.2em; margin: 0; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; flex-wrap: nowrap; }
.ellipsis { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
code { font-size: 12.5px; background: var(--bubble-cust); padding: 1px 6px; border-radius: 4px; word-break: break-all; }

/* Buttons & inputs */
.btn {
  border: 1px solid var(--border); background: var(--panel); color: var(--text);
  padding: 9px 16px; border-radius: 8px; font: inherit; font-weight: 600; cursor: pointer;
}
.btn:disabled { opacity: .6; cursor: default; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.ghost { background: transparent; }
.btn.small { padding: 6px 12px; font-size: 13px; }
input, textarea, select {
  width: 100%; font: inherit; color: var(--text); background: var(--panel);
  border: 1px solid var(--border); border-radius: 8px; padding: 9px 11px;
}
select { width: auto; }
textarea { resize: vertical; line-height: 1.55; }
textarea.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
label { display: block; font-weight: 600; margin: 18px 0 6px; }
label:first-child { margin-top: 0; }
label small { font-weight: 400; color: var(--muted); margin-left: 6px; }

/* Switch */
.switch { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; font-weight: 500; margin: 0; }
.switch input { display: none; }
.slider { width: 40px; height: 22px; border-radius: 22px; background: var(--border); position: relative; transition: .2s; flex: none; }
.slider::after { content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%; background: #fff; transition: .2s; }
.switch input:checked + .slider { background: var(--ok); }
.switch input:checked + .slider::after { transform: translateX(18px); }
.switch.big .switch-label { font-weight: 700; }

/* Login */
.login { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 32px; width: 100%; max-width: 360px; display: grid; gap: 12px; text-align: center; }
.login-card h1 { margin: 0; font-size: 20px; }
.login-card p { margin: 0; }
.logo { font-size: 30px; }

/* Layout */
.app { display: flex; min-height: 100%; }
.sidebar {
  width: 220px; flex: none; background: var(--panel); border-right: 1px solid var(--border);
  padding: 18px 12px; display: flex; flex-direction: column; gap: 18px; position: sticky; top: 0; height: 100vh;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 17px; padding: 0 8px; }
.brand .logo { font-size: 22px; }
nav { display: grid; gap: 2px; flex: 1; align-content: start; }
nav button {
  text-align: left; border: 0; background: none; color: var(--text); font: inherit;
  padding: 9px 12px; border-radius: 8px; cursor: pointer;
}
nav button:hover { background: var(--bubble-cust); }
nav button.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
main { flex: 1; min-width: 0; padding: 24px 32px 100px; max-width: 1200px; }
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.page-head h2 { margin: 0; font-size: 22px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.card h3 { margin: 0 0 14px; font-size: 15px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.grid2 > div { display: flex; flex-direction: column; }
.grid2 > div > input { margin-top: auto; }
.grid2.names > div > input { margin-top: 0; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.grid4 .card { margin: 0 0 16px; }
.stat-v { font-size: 26px; font-weight: 800; margin-top: 4px; }
.stat-v small { font-size: 13px; color: var(--muted); font-weight: 500; }
.hint { background: var(--accent-soft); border-radius: 8px; padding: 10px 12px; margin: 16px 0 0; font-size: 13px; }

.status-list { display: grid; gap: 10px; margin-bottom: 18px; }
.status-row { display: grid; grid-template-columns: 12px 200px 1fr; gap: 10px; align-items: center; }
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.ok { background: var(--ok); }
.dot.bad { background: var(--bad); }
.log { background: var(--bubble-cust); border-radius: 8px; padding: 12px; margin: 14px 0 0; white-space: pre-wrap; font-size: 13px; }

/* Model chips */
.chips { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 8px; margin-bottom: 8px; }
.chip {
  display: grid; gap: 2px; text-align: left; font: inherit; color: var(--text); cursor: pointer;
  background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px;
}
.chip b { font-size: 12.5px; word-break: break-all; }
.chip span { font-size: 12px; }
.chip.selected { border-color: var(--accent); background: var(--accent-soft); }

/* Chats */
.chats-layout { display: grid; grid-template-columns: 320px 1fr; gap: 16px; align-items: start; }
.chat-list { padding: 6px; max-height: calc(100vh - 150px); overflow-y: auto; }
.chat-item {
  display: grid; gap: 3px; width: 100%; text-align: left; font: inherit; color: var(--text);
  background: none; border: 0; border-radius: 8px; padding: 10px; cursor: pointer;
}
.chat-item:hover { background: var(--bubble-cust); }
.chat-item.active { background: var(--accent-soft); }
.chat-view { min-height: 300px; }
.chat-head { border-bottom: 1px solid var(--border); padding-bottom: 12px; margin-bottom: 12px; }
.badge { font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 20px; background: var(--bubble-cust); margin-left: 6px; white-space: nowrap; }
.badge.blue { background: var(--accent-soft); color: var(--accent); }
.badge.orange { background: var(--bubble-agent); color: var(--warn); }

/* Messages */
.messages { display: flex; flex-direction: column; gap: 10px; overflow-y: auto; max-height: calc(100vh - 260px); padding: 4px; }
.msg { display: flex; flex-direction: column; max-width: 78%; }
.msg .bubble { padding: 9px 13px; border-radius: 14px; white-space: pre-wrap; word-wrap: break-word; }
.msg .tiny { margin: 3px 6px 0; }
.msg.customer { align-self: flex-start; }
.msg.customer .bubble { background: var(--bubble-cust); border-bottom-left-radius: 4px; }
.msg.bot, .msg.agent { align-self: flex-end; align-items: flex-end; }
.msg.bot .bubble { background: var(--bubble-bot); border-bottom-right-radius: 4px; }
.msg.agent .bubble { background: var(--bubble-agent); border-bottom-right-radius: 4px; }
.msg.system { align-self: center; max-width: 90%; font-size: 12.5px; color: var(--muted); background: var(--bubble-cust); padding: 4px 12px; border-radius: 20px; text-align: center; }
.msg.typing .bubble { color: var(--muted); font-style: italic; }

.test-box { display: flex; flex-direction: column; gap: 12px; }
.test-box .messages { min-height: 360px; max-height: calc(100vh - 330px); }
.composer { display: flex; gap: 8px; }

/* Customer data */
.customer-data { margin-top: 10px; }
.customer-data summary, .test-data summary { cursor: pointer; font-size: 13px; }
.customer-data pre { background: var(--bubble-cust); border-radius: 8px; padding: 10px 12px; white-space: pre-wrap; font-size: 12.5px; margin: 8px 0 0; }
.test-data { padding: 14px 20px; }
.test-data textarea { margin-top: 10px; }

/* Save bar & toast */
.save-bar {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 10;
  background: var(--text); color: var(--panel); border-radius: 12px; padding: 10px 12px 10px 18px;
  display: flex; gap: 10px; align-items: center; box-shadow: 0 8px 30px rgba(0,0,0,.2);
}
.save-bar .btn.ghost { color: var(--panel); border-color: transparent; }
.toast {
  position: fixed; top: 18px; right: 18px; z-index: 20; padding: 10px 16px; border-radius: 8px;
  color: #fff; background: var(--ok); box-shadow: 0 6px 20px rgba(0,0,0,.15); max-width: 420px;
}
.toast.err { background: var(--bad); }
.toast.warn { background: var(--warn); }

/* Mobile */
@media (max-width: 860px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; flex-direction: row; align-items: center; padding: 10px 16px; gap: 10px; overflow-x: auto; }
  .brand span:last-child { display: none; }
  nav { display: flex; gap: 4px; }
  nav button { white-space: nowrap; }
  main { padding: 16px 16px 100px; }
  .grid2 { grid-template-columns: 1fr; }
  .grid4 { grid-template-columns: 1fr 1fr; }
  .chats-layout { grid-template-columns: 1fr; }
  .status-row { grid-template-columns: 12px 1fr; }
  .status-row .muted { grid-column: 2; }
  .save-bar { width: calc(100% - 32px); }
}