/* styles.css — white-label assistant UI.
 *
 * Theming is 100% CSS custom properties. Two full palettes (light + dark) are
 * defined below; the effective theme is chosen by:
 *   - no [data-theme] on <html>  → follow the OS (prefers-color-scheme)
 *   - [data-theme="light"|"dark"] → hard override (persisted toggle wins both ways)
 *
 * The ONLY tenant-specific values are --accent / --accent-strong, which app.js
 * sets at runtime from window.__TENANT__.branding. Everything else is neutral, so
 * no company name / logo / colour is ever hardcoded here.
 */

/* ---------- palette: light (default) ---------- */
:root {
  --bg: #ffffff;
  --bg-elev: #f7f7f8;
  --bg-input: #ffffff;
  --bg-sidebar: #f7f7f8;
  --border: #e3e3e6;
  --border-strong: #cfcfd4;
  --text: #1f2023;
  --text-dim: #6b6d76;
  --text-faint: #9a9ba4;

  /* tenant accent — overwritten by app.js; these are safe neutral defaults */
  --accent: #10a37f;
  --accent-strong: #0e8e6e;
  --accent-hover: color-mix(in srgb, var(--accent) 88%, #000);
  --on-accent: #ffffff;

  --user-bubble: var(--accent);
  --user-text: var(--on-accent);
  --assistant-bubble: #f2f2f4;
  --assistant-text: #1f2023;
  --think-bg: #f0f4f8;
  --think-border: #dbe4ee;
  --danger: #c0392b;
  --danger-bg: #fdecea;
  --ok: #1a8f5c;

  --shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 4px 20px rgba(0, 0, 0, .05);
  --shadow-pop: 0 8px 30px rgba(0, 0, 0, .16);
  --radius: 14px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ---------- palette: dark ---------- */
/* Applied when the OS is dark AND the user hasn't forced light. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1a1d;
    --bg-elev: #232327;
    --bg-input: #2a2a2f;
    --bg-sidebar: #202024;
    --border: #34343a;
    --border-strong: #45454d;
    --text: #ececf1;
    --text-dim: #9a9ba4;
    --text-faint: #6f7079;

    --accent-hover: color-mix(in srgb, var(--accent) 82%, #fff);
    --assistant-bubble: #2a2a2f;
    --assistant-text: #ececf1;
    --think-bg: #24272d;
    --think-border: #363b44;
    --danger: #ff6b5e;
    --danger-bg: #3a2422;
    --ok: #4ade80;

    --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 4px 24px rgba(0, 0, 0, .35);
    --shadow-pop: 0 8px 34px rgba(0, 0, 0, .55);
  }
}
/* Hard override to dark regardless of OS (persisted toggle). */
:root[data-theme="dark"] {
  --bg: #1a1a1d;
  --bg-elev: #232327;
  --bg-input: #2a2a2f;
  --bg-sidebar: #202024;
  --border: #34343a;
  --border-strong: #45454d;
  --text: #ececf1;
  --text-dim: #9a9ba4;
  --text-faint: #6f7079;
  --accent-hover: color-mix(in srgb, var(--accent) 82%, #fff);
  --assistant-bubble: #2a2a2f;
  --assistant-text: #ececf1;
  --think-bg: #24272d;
  --think-border: #363b44;
  --danger: #ff6b5e;
  --danger-bg: #3a2422;
  --ok: #4ade80;
  --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 4px 24px rgba(0, 0, 0, .35);
  --shadow-pop: 0 8px 34px rgba(0, 0, 0, .55);
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  height: 100dvh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
.hidden { display: none !important; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}
button { font-family: inherit; }

/* ---------- generic buttons ---------- */
.btn {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  padding: 7px 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background .12s, border-color .12s, transform .05s;
}
.btn:hover { background: var(--bg-elev); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn.icon { padding: 7px; }
.btn svg { width: 16px; height: 16px; display: block; }
.btn.primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.btn.primary:hover { background: var(--accent-hover); }
.btn.primary:disabled { opacity: .55; cursor: default; }

/* ================================================================
   LOGIN SCREEN
   ================================================================ */
.login {
  height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(1200px 600px at 50% -10%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 60%),
    var(--bg);
}
.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 32px 28px;
  text-align: center;
}
.login-logo { height: 44px; width: auto; max-width: 220px; margin: 0 auto 18px; display: block; object-fit: contain; }
.login-card h1 { font-size: 20px; margin: 0 0 6px; font-weight: 700; letter-spacing: -.01em; }
.login-card .sub { font-size: 14px; color: var(--text-dim); line-height: 1.5; margin: 0 0 22px; }
.login form { display: flex; flex-direction: column; gap: 12px; text-align: left; }
.text-input {
  font-family: var(--sans);
  font-size: 15px;
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 11px;
  background: var(--bg-input);
  color: var(--text);
  outline: none;
  width: 100%;
}
.text-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}
.login .btn.primary { justify-content: center; padding: 12px; font-size: 15px; border-radius: 11px; }
.login-msg {
  margin-top: 16px;
  font-size: 13.5px;
  line-height: 1.5;
  padding: 12px 14px;
  border-radius: 11px;
  text-align: left;
}
.login-msg.ok { background: var(--think-bg); border: 1px solid var(--think-border); color: var(--text); }
.login-msg.err { background: var(--danger-bg); border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent); color: var(--danger); }
.login-msg a { color: var(--accent); word-break: break-all; }

/* ================================================================
   APP SHELL
   ================================================================ */
.app { display: flex; flex-direction: column; height: 100dvh; }

/* ---- header ---- */
header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  flex-shrink: 0;
  min-height: 54px;
}
.brand { display: flex; align-items: center; gap: 9px; min-width: 0; }
.brand-logo { height: calc(26px * var(--logo-scale, 1)); width: auto; max-width: calc(150px * var(--logo-scale, 1)); object-fit: contain; display: block; }
.brand-name { font-weight: 700; font-size: 15.5px; letter-spacing: -.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.model-pill {
  font-size: 11.5px;
  font-family: var(--mono);
  color: var(--text-dim);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 999px;
  white-space: nowrap;
}
header .spacer { flex: 1; }

/* icon-only header buttons */
.iconbtn {
  width: 36px; height: 36px;
  border-radius: 9px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  display: grid; place-items: center;
  transition: background .12s, color .12s, border-color .12s, transform .05s;
  flex-shrink: 0;
}
.iconbtn:hover { background: color-mix(in srgb, var(--text) 8%, transparent); color: var(--text); }
.iconbtn:active { transform: translateY(1px); }
.iconbtn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.iconbtn svg { width: 19px; height: 19px; }

/* language selector */
.lang-select {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  padding: 7px 8px;
  cursor: pointer;
  outline: none;
}
.lang-select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* thinking toggle */
.toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}
.toggle input { position: absolute; opacity: 0; width: 0; height: 0; }
.toggle .track {
  width: 34px; height: 20px; border-radius: 999px;
  background: var(--border-strong);
  position: relative; transition: background .15s;
  flex-shrink: 0;
}
.toggle .track::after {
  content: ""; position: absolute; top: 2px; left: 2px;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; transition: transform .15s;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .3);
}
.toggle input:checked + .track { background: var(--accent); }
.toggle input:checked + .track::after { transform: translateX(14px); }
.toggle input:focus-visible + .track { outline: 2px solid var(--accent); outline-offset: 2px; }

/* account menu */
.menu-wrap { position: relative; }
.avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--accent); color: var(--on-accent);
  border: none; cursor: pointer;
  display: grid; place-items: center;
  font-weight: 600; font-size: 13px;
  transition: transform .05s, filter .12s;
}
.avatar:hover { filter: brightness(1.06); }
.avatar:active { transform: translateY(1px); }
.avatar:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.menu {
  position: absolute; right: 0; top: calc(100% + 8px);
  min-width: 220px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-pop);
  padding: 8px;
  z-index: 40;
}
.menu .who { padding: 8px 10px 10px; border-bottom: 1px solid var(--border); margin-bottom: 6px; }
.menu .who .em { font-size: 13px; font-weight: 600; word-break: break-all; }
.menu .who .role { font-size: 11.5px; color: var(--text-dim); margin-top: 2px; }
.menu-item {
  display: flex; align-items: center; gap: 9px;
  width: 100%; text-align: left;
  background: transparent; border: none; cursor: pointer;
  padding: 9px 10px; border-radius: 8px;
  font-size: 13.5px; color: var(--text);
}
.menu-item:hover { background: var(--bg-elev); }
.menu-item svg { width: 16px; height: 16px; color: var(--text-dim); }

/* ---- body: sidebar + chat column ---- */
.body { flex: 1; display: flex; min-height: 0; position: relative; }

/* sidebar */
.sidebar {
  width: 268px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  min-height: 0;
  transition: margin-left .2s ease;
}
/* Sidebar is shown when the app has .sidebar-open (set per screen width at boot,
   flipped by the header toggle). Hidden = slid out by a negative margin. */
.app:not(.sidebar-open) .sidebar { margin-left: -268px; }
.sidebar-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 12px 8px;
}
.sidebar-head .ttl { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--text-dim); }
.new-chat-btn {
  display: flex; align-items: center; gap: 8px;
  margin: 4px 10px 8px;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 11px;
  background: var(--bg);
  color: var(--text);
  font-size: 14px; font-weight: 500;
  cursor: pointer;
  transition: background .12s, border-color .12s;
}
.new-chat-btn:hover { background: var(--bg-elev); border-color: var(--accent); }
.new-chat-btn svg { width: 17px; height: 17px; }
.conv-list { flex: 1; overflow-y: auto; padding: 4px 8px 12px; }
.conv-empty { color: var(--text-dim); font-size: 13px; padding: 14px 12px; text-align: center; }
.conv {
  display: flex; align-items: center; gap: 6px;
  padding: 9px 10px; border-radius: 9px;
  cursor: pointer; position: relative;
  color: var(--text);
}
.conv:hover { background: color-mix(in srgb, var(--text) 6%, transparent); }
.conv.active { background: color-mix(in srgb, var(--accent) 15%, transparent); }
.conv .cmeta { flex: 1; min-width: 0; }
.conv .ctitle { font-size: 13.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv .ctime { font-size: 11px; color: var(--text-dim); margin-top: 1px; }
.conv .cdel {
  border: none; background: transparent; color: var(--text-dim);
  cursor: pointer; padding: 4px; border-radius: 6px; flex-shrink: 0;
  opacity: 0; transition: opacity .12s, background .12s, color .12s;
}
.conv:hover .cdel, .conv.active .cdel { opacity: 1; }
.conv .cdel:hover { background: var(--danger-bg); color: var(--danger); }
.conv .cdel svg { width: 15px; height: 15px; display: block; }

/* chat column */
.chat { flex: 1; display: flex; flex-direction: column; min-width: 0; min-height: 0; }

main {
  flex: 1;
  overflow-y: auto;
  scroll-behavior: smooth;
}
.messages {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 20px 8px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* empty state */
.empty {
  text-align: center;
  color: var(--text-dim);
  margin: 14vh auto;
  max-width: 480px;
  padding: 0 20px;
}
.empty .glyph {
  width: 52px; height: 52px; margin: 0 auto 16px;
  border-radius: 15px;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
}
.empty .glyph svg { width: 28px; height: 28px; }
.empty h1 { font-size: 22px; margin: 0 0 8px; color: var(--text); font-weight: 700; }
.empty p { font-size: 14.5px; line-height: 1.55; margin: 6px 0; }

/* ---- message rows ---- */
.row { display: flex; }
.row.user { justify-content: flex-end; }
.row.assistant { justify-content: flex-start; }

.bubble {
  max-width: 88%;
  padding: 11px 15px;
  border-radius: var(--radius);
  line-height: 1.55;
  font-size: 15px;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}
.row.user .bubble {
  background: var(--user-bubble);
  color: var(--user-text);
  border-bottom-right-radius: 4px;
}
.row.assistant .bubble {
  background: var(--assistant-bubble);
  color: var(--assistant-text);
  border-bottom-left-radius: 4px;
}
.bubble.error {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
}

/* rendered markdown inside the assistant bubble */
.bubble.md { white-space: normal; }
.bubble.md > *:first-child { margin-top: 0; }
.bubble.md > *:last-child { margin-bottom: 0; }
.bubble.md p { margin: 0 0 10px; }
.bubble.md h1, .bubble.md h2, .bubble.md h3,
.bubble.md h4, .bubble.md h5, .bubble.md h6 { margin: 16px 0 8px; line-height: 1.3; font-weight: 700; }
.bubble.md h1 { font-size: 1.4em; } .bubble.md h2 { font-size: 1.25em; }
.bubble.md h3 { font-size: 1.12em; } .bubble.md h4 { font-size: 1em; }
.bubble.md ul, .bubble.md ol { margin: 4px 0 10px; padding-left: 1.4em; }
.bubble.md li { margin: 3px 0; }
.bubble.md li > p { margin: 0; }
.bubble.md a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.bubble.md hr { border: none; border-top: 1px solid var(--border); margin: 14px 0; }
.bubble.md img { max-width: 100%; border-radius: 8px; }
.bubble.md code {
  font-family: var(--mono); font-size: .88em;
  background: color-mix(in srgb, var(--text) 8%, transparent);
  padding: .12em .4em; border-radius: 5px;
}
.bubble.md pre {
  background: color-mix(in srgb, var(--text) 8%, transparent);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  overflow-x: auto;
  margin: 0 0 10px;
}
.bubble.md pre code { background: none; padding: 0; font-size: .85em; line-height: 1.45; }
.bubble.md blockquote {
  margin: 0 0 10px; padding: 2px 0 2px 12px;
  border-left: 3px solid var(--border-strong); color: var(--text-dim);
}
.bubble.md table {
  border-collapse: collapse; margin: 0 0 10px; font-size: .92em;
  display: block; max-width: 100%; overflow-x: auto;
}
.bubble.md th, .bubble.md td { border: 1px solid var(--border-strong); padding: 5px 9px; text-align: left; }
.bubble.md th { background: color-mix(in srgb, var(--text) 6%, transparent); font-weight: 600; }
.bubble.md .katex-display { overflow-x: auto; overflow-y: hidden; padding: 2px 0; margin: 8px 0; }
.bubble.md .katex { font-size: 1.02em; }

/* attachments shown in the user bubble */
.u-atts { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.u-atts img { width: 130px; max-width: 42vw; border-radius: 8px; display: block; }
.u-atts .u-file {
  font-size: 12px; background: rgba(255, 255, 255, .18); color: var(--user-text);
  padding: 4px 8px; border-radius: 7px; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis; max-width: 100%;
}

/* assistant wrapper (thinking + bubble + stats + actions stack) */
.assistant-wrap { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; max-width: 88%; }

.stats { font-size: 11px; color: var(--text-dim); font-variant-numeric: tabular-nums; padding: 1px 4px; min-height: 13px; }

/* per-message action row */
.msg-actions { display: flex; gap: 4px; padding: 2px 2px 0; flex-wrap: wrap; }
.act {
  display: inline-flex; align-items: center; gap: 5px;
  border: none; background: transparent;
  color: var(--text-dim); cursor: pointer;
  font-size: 12px; padding: 4px 7px; border-radius: 7px;
  transition: background .12s, color .12s;
}
.act:hover { background: color-mix(in srgb, var(--text) 8%, transparent); color: var(--text); }
.act:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.act svg { width: 14px; height: 14px; }
.act.on { color: var(--accent); }

/* thinking area */
details.think {
  width: 100%;
  background: var(--think-bg);
  border: 1px solid var(--think-border);
  border-radius: 10px;
  font-size: 13px;
  color: var(--text-dim);
  overflow: hidden;
}
details.think summary {
  cursor: pointer; padding: 8px 12px; list-style: none;
  display: flex; align-items: center; gap: 7px; font-weight: 500; user-select: none;
}
details.think summary::-webkit-details-marker { display: none; }
details.think summary .chev { transition: transform .15s; width: 13px; height: 13px; }
details.think[open] summary .chev { transform: rotate(90deg); }
details.think .think-body {
  padding: 0 12px 10px 30px;
  white-space: pre-wrap;
  font-size: 12.5px; line-height: 1.5;
  color: var(--text-dim);
  max-height: 240px; overflow-y: auto;
}
/* while live it's a small scrolling window */
.thinking-live .think-body { max-height: 150px; }
.thinking-live .think-dots::after { content: ""; animation: dots 1.4s steps(4, end) infinite; }
@keyframes dots { 0% { content: ""; } 25% { content: "."; } 50% { content: ".."; } 75% { content: "..."; } 100% { content: ""; } }

.cursor::after {
  content: "▋"; display: inline-block; margin-left: 1px;
  animation: blink 1s steps(2, start) infinite; color: var(--accent); font-weight: 400;
}
@keyframes blink { to { visibility: hidden; } }

/* ---- composer ---- */
footer {
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
}
.composer {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  padding: 8px;
  box-shadow: var(--shadow);
  transition: border-color .12s;
}
.composer:focus-within { border-color: var(--accent); }
.composer-row { display: flex; align-items: flex-end; gap: 6px; }

/* attachment chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 2px 2px 0; }
.chips:empty { display: none; }
.chip {
  display: flex; align-items: center; gap: 7px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 9px; padding: 4px 6px; font-size: 12px; max-width: 240px;
}
.chip img { width: 34px; height: 34px; object-fit: cover; border-radius: 6px; flex-shrink: 0; }
.chip .cico { width: 26px; height: 26px; display: grid; place-items: center; flex-shrink: 0; color: var(--text-dim); }
.chip .cmeta2 { display: flex; flex-direction: column; min-width: 0; }
.chip .cname { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 500; }
.chip .csub { color: var(--text-dim); font-size: 10.5px; }
.chip .csub.err { color: var(--danger); }
.chip .rm {
  border: none; background: transparent; color: var(--text-dim); cursor: pointer;
  font-size: 15px; line-height: 1; padding: 2px 4px; border-radius: 5px; flex-shrink: 0;
}
.chip .rm:hover { background: var(--danger-bg); color: var(--danger); }

/* round composer icon buttons */
.composer-btn {
  flex-shrink: 0;
  width: 38px; height: 38px;
  border-radius: 10px;
  border: none;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  display: grid; place-items: center;
  transition: background .12s, color .12s, transform .05s;
}
.composer-btn:hover { background: color-mix(in srgb, var(--text) 8%, transparent); color: var(--text); }
.composer-btn:active { transform: translateY(1px); }
.composer-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.composer-btn svg { width: 20px; height: 20px; }
.composer-btn.recording { color: var(--danger); background: var(--danger-bg); animation: pulse 1.3s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .55; } }

.composer textarea {
  flex: 1;
  border: none;
  background: transparent;
  resize: none;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  max-height: 200px;
  overflow-x: hidden;
  overflow-y: auto;
  padding: 8px 2px;
  outline: none;
}
.composer textarea::placeholder { color: var(--text-dim); }

.send-btn {
  flex-shrink: 0;
  width: 38px; height: 38px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: var(--on-accent);
  cursor: pointer;
  display: grid; place-items: center;
  transition: background .12s, transform .05s, opacity .12s;
}
.send-btn:hover { background: var(--accent-hover); }
.send-btn:active { transform: translateY(1px); }
.send-btn:disabled { opacity: .4; cursor: not-allowed; }
.send-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.send-btn svg { width: 19px; height: 19px; }
.send-btn.stop { background: var(--danger); }
.send-btn.stop:hover { background: color-mix(in srgb, var(--danger) 85%, #000); }

.composer-note {
  max-width: 820px; margin: 6px auto 0; font-size: 12px; text-align: center; color: var(--danger);
}
.composer-note[hidden] { display: none; }
.hint { max-width: 820px; margin: 6px auto 0; font-size: 11px; color: var(--text-faint); text-align: center; }

/* ---- toast ---- */
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  background: var(--text); color: var(--bg);
  font-size: 13px; padding: 9px 15px; border-radius: 10px;
  box-shadow: var(--shadow-pop); z-index: 60;
  opacity: 0; pointer-events: none; transition: opacity .18s, transform .18s;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }

/* ---- responsive ---- */
@media (max-width: 860px) {
  /* on narrow screens the sidebar floats over the chat as a slide-in overlay */
  .sidebar {
    position: fixed; top: 54px; left: 0; bottom: 0; z-index: 30;
    box-shadow: var(--shadow-pop);
  }
}
@media (max-width: 620px) {
  .model-pill { display: none; }
  .toggle .lbl { display: none; }
  .brand-name { display: none; }
  .bubble, .assistant-wrap { max-width: 88%; }
  .messages { padding-top: 16px; }
}

/* ---- inline TTS player (read-aloud) ---- */
.tts-player {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 6px 0 2px;
  padding: 6px 8px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  max-width: 100%;
}
.tts-player audio {
  height: 34px;
  flex: 1;
  min-width: 0;
  max-width: 360px;
}
.tts-dl,
.tts-close {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-dim);
  cursor: pointer;
  text-decoration: none;
}
.tts-dl svg { width: 16px; height: 16px; }
.tts-dl:hover,
.tts-close:hover { color: var(--accent); border-color: var(--accent); }
.tts-close { font-size: 14px; line-height: 1; }

/* ---- translate language menu ---- */
.tr-menu {
  position: fixed;
  z-index: 60;
  min-width: 190px;
  padding: 5px;
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  box-shadow: var(--shadow-pop);
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.tr-head {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .02em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 6px 10px 4px;
}
.tr-item {
  text-align: left;
  border: none;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 14px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
}
.tr-item:hover { background: var(--bg-elev); color: var(--accent); }

/* Brand logos are dark-on-transparent (designed for light backgrounds). In dark
   mode, sit them on a small white chip so they stay legible. box-sizing keeps the
   header/login height stable. */
.brand-logo, .login-logo { box-sizing: border-box; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .brand-logo {
    background: #fff; border-radius: 7px; padding: 3px 7px;
  }
  :root:not([data-theme="light"]) .login-logo {
    background: #fff; border-radius: 10px; padding: 8px 12px;
  }
}
:root[data-theme="dark"] .brand-logo {
  background: #fff; border-radius: 7px; padding: 3px 7px;
}
:root[data-theme="dark"] .login-logo {
  background: #fff; border-radius: 10px; padding: 8px 12px;
}

/* TTS speed toggle (subtle, text button in the player) */
.tts-speed {
  flex-shrink: 0;
  min-width: 34px; height: 30px;
  padding: 0 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-dim);
  font: 600 12px var(--sans);
  cursor: pointer;
}
.tts-speed:hover { color: var(--accent); border-color: var(--accent); }
/* mic transcribing state */
.composer-btn.busy { opacity: .6; pointer-events: none; }

/* knowledge-source (pack) selector in the composer */
.composer-btn.active { color: var(--on-accent); background: var(--accent); }
.composer-btn.active:hover { background: var(--accent-hover); }
.composer-btn .src-label {
  font: 600 12px var(--sans);
  max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.composer-btn .src-label:empty { display: none; }
#sourceBtn { width: auto; gap: 5px; padding: 0 9px; }
/* selected row in the translate / source menus */
.tr-item.on { color: var(--accent); font-weight: 600; }
