.arc, .arc * { box-sizing: border-box; }
  .arc[hidden] { display: none !important; }
  .arc { --c1: #0ea5e9; --c2: #1d4ed8; --ink: #0f172a; --mut: #64748b; --line: #e6ebf3;
         font-family: Inter, system-ui, -apple-system, "Segoe UI", sans-serif; }

  /* Launcher */
  .arc-launch {
    position: fixed; right: 22px; bottom: 22px; z-index: 900; display: flex; align-items: center; gap: 12px;
    padding: 8px 20px 8px 8px; border: 0; border-radius: 999px; cursor: pointer;
    background: #fff; color: var(--ink); box-shadow: 0 18px 44px -12px rgba(15,23,42,.35), 0 0 0 1px rgba(15,23,42,.05);
    transition: transform .2s cubic-bezier(.2,.8,.2,1), box-shadow .2s;
  }
  .arc-launch:hover { transform: translateY(-3px); box-shadow: 0 24px 54px -14px rgba(29,78,216,.45), 0 0 0 1px rgba(29,78,216,.12); }
  .arc-launch .arc-av { width: 48px; height: 48px; }
  .arc-launch-txt { text-align: left; line-height: 1.2; }
  .arc-launch-txt b { display: block; font-size: 14.5px; font-weight: 800; letter-spacing: -.01em; }
  .arc-launch-txt span { font-size: 12px; color: #16a34a; font-weight: 600; }
  .arc-count {
    position: absolute; top: -4px; right: -4px; min-width: 22px; height: 22px; padding: 0 6px; border-radius: 999px;
    background: #ef4444; color: #fff; font-size: 12px; font-weight: 800; display: none; place-items: center;
    box-shadow: 0 0 0 3px #fff;
  }
  .arc-launch.has-unread .arc-count { display: grid; }

  /* Avatar with online dot */
  .arc-av { position: relative; flex: none; width: 40px; height: 40px; border-radius: 50%;
    background: linear-gradient(135deg, var(--c1), var(--c2)); color: #fff; display: grid; place-items: center;
    font-weight: 800; font-size: 14px; letter-spacing: .02em; }
  .arc-av::after { content: ""; position: absolute; right: 0; bottom: 1px; width: 11px; height: 11px; border-radius: 50%;
    background: #22c55e; box-shadow: 0 0 0 2.5px #fff; }
  .arc-av.sm { width: 28px; height: 28px; font-size: 10.5px; } .arc-av.sm::after { display: none; }
  /* The avatar is the site logo: its "AR" mark (the tail of the car line fades in from the left) on white.
     160% = the mark ends 6% before the right edge at any avatar size. */
  .arc .arc-av.logo { background: #fff url("data:image/png;base64,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") no-repeat 160% 50% / 110% auto;
    box-shadow: inset 0 0 0 1px rgba(15,23,42,.1); border: 0; }
  .arc .arc-head .arc-av.logo { box-shadow: 0 0 0 2px rgba(255,255,255,.4); }

  /* Panel */
  .arc-panel {
    position: fixed; right: 22px; bottom: 22px; z-index: 1001; width: 392px;   /* above the sticky site header (100) */ height: min(640px, calc(100vh - 44px));
    display: flex; flex-direction: column; overflow: hidden; border-radius: 24px; background: #fff;
    box-shadow: 0 40px 100px -20px rgba(2,6,23,.45), 0 0 0 1px rgba(15,23,42,.06);
    opacity: 0; transform: translateY(16px) scale(.97); transform-origin: bottom right; pointer-events: none;
    visibility: hidden;   /* closed: not rendered, not focusable */
    transition: opacity .22s ease, transform .26s cubic-bezier(.2,.8,.2,1), visibility 0s linear .26s;
  }
  .arc-panel.open { opacity: 1; transform: none; pointer-events: auto; visibility: visible; transition-delay: 0s; }
  .arc-launch:focus-visible, .arc-close:focus-visible, .arc-send:focus-visible { outline: 3px solid rgba(14,165,233,.55); outline-offset: 2px; }
  .arc-head {
    position: relative; padding: 18px 18px 22px; color: #fff; overflow: hidden;
    background: radial-gradient(ellipse 380px 200px at 100% 0%, rgba(56,189,248,.45), transparent 60%),
                linear-gradient(135deg, #075985 0%, #0f4fa8 55%, #1d4ed8 100%);
  }
  .arc-head::before { content: ""; position: absolute; inset: 0; opacity: .35; pointer-events: none;
    background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
    background-size: 28px 28px; mask-image: linear-gradient(180deg, #000, transparent); -webkit-mask-image: linear-gradient(180deg, #000, transparent); }
  .arc-head > * { position: relative; }
  .arc-head-row { display: flex; align-items: center; gap: 12px; }
  .arc-head .arc-av { width: 46px; height: 46px; background: rgba(255,255,255,.16); border: 1.5px solid rgba(255,255,255,.35); }
  .arc-head .arc-av::after { box-shadow: 0 0 0 2.5px #0f4fa8; }
  .arc-head b { display: block; font-size: 16px; font-weight: 800; letter-spacing: -.01em; }
  .arc-head small { display: flex; align-items: center; gap: 6px; color: #bae6fd; font-size: 12.5px; margin-top: 2px; }
  .arc-close { margin-left: auto; width: 34px; height: 34px; border: 0; border-radius: 11px; cursor: pointer;
    background: rgba(255,255,255,.14); color: #fff; display: grid; place-items: center; transition: background .15s; }
  .arc-close:hover { background: rgba(255,255,255,.24); }
  .arc-close svg { width: 18px; height: 18px; }
  .arc-trust { display: flex; gap: 14px; margin-top: 14px; font-size: 12px; color: rgba(255,255,255,.82); flex-wrap: wrap; }
  .arc-trust span { display: inline-flex; align-items: center; gap: 5px; }
  .arc-trust svg { width: 14px; height: 14px; color: #7dd3fc; }

  .arc-body { flex: 1; overflow-y: auto; padding: 16px 16px 10px; background: #f7f9fc; display: flex; flex-direction: column; gap: 10px;
    scroll-behavior: smooth; }
  .arc-ctx {
    display: flex; gap: 12px; align-items: center; padding: 12px 12px 12px 14px; border-radius: 16px; background: #fff;
    border: 1px solid var(--line); box-shadow: 0 6px 18px -12px rgba(15,23,42,.25);
  }
  .arc-ctx-ic { flex: none; width: 38px; height: 38px; border-radius: 11px; background: #eff6ff; color: var(--c2); display: grid; place-items: center; }
  .arc-ctx-ic svg { width: 20px; height: 20px; }
  .arc-ctx-t { min-width: 0; flex: 1; }
  .arc-ctx-t span { display: block; font-size: 11px; text-transform: uppercase; letter-spacing: .07em; color: var(--mut); font-weight: 700; }
  .arc-ctx-t b { display: block; font-size: 13.5px; color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .arc-ctx-t code { display: block; font: 600 12px 'JetBrains Mono', Consolas, monospace; color: var(--c2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .arc-ctx button { flex: none; border: 0; border-radius: 10px; padding: 8px 12px; cursor: pointer; font-family: inherit;
    font-size: 12.5px; font-weight: 700; color: #fff; background: linear-gradient(135deg, var(--c1), var(--c2)); }

  .arc-row { display: flex; gap: 8px; align-items: flex-end; max-width: 100%; animation: arc-in .22s ease; }
  .arc-row.me { justify-content: flex-end; }
  .arc-bub { max-width: 80%; padding: 10px 13px; border-radius: 18px; font-size: 14px; line-height: 1.5; white-space: pre-wrap; word-wrap: break-word; }
  .arc-row.them .arc-bub { background: #fff; color: var(--ink); border: 1px solid var(--line); border-bottom-left-radius: 6px; box-shadow: 0 4px 12px -10px rgba(15,23,42,.3); }
  .arc-row.me .arc-bub { color: #fff; background: linear-gradient(135deg, var(--c1), var(--c2)); border-bottom-right-radius: 6px; box-shadow: 0 8px 18px -10px rgba(29,78,216,.6); }
  .arc-meta { display: flex; justify-content: flex-end; align-items: center; gap: 4px; margin-top: 4px; font-size: 10.5px; opacity: .72; }
  .arc-row.them .arc-meta { justify-content: flex-start; }
  .arc-meta svg { width: 14px; height: 14px; }
  .arc-sys { align-self: center; font-size: 12px; color: var(--mut); background: #eef2f7; padding: 6px 12px; border-radius: 999px; text-align: center; max-width: 92%; }
  .arc-sys.err { background: #fef2f2; color: #b91c1c; }
  .arc-wait { align-self: flex-start; display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--mut); padding: 2px 4px; }
  .arc-dots { display: inline-flex; gap: 3px; padding: 9px 11px; background: #fff; border: 1px solid var(--line); border-radius: 14px; border-bottom-left-radius: 5px; }
  .arc-dots i { width: 6px; height: 6px; border-radius: 50%; background: #94a3b8; animation: arc-blink 1.2s infinite; }
  .arc-dots i:nth-child(2) { animation-delay: .2s; } .arc-dots i:nth-child(3) { animation-delay: .4s; }

  .arc-quick { display: grid; gap: 8px; margin-top: 2px; }
  .arc-quick button {
    display: flex; align-items: center; gap: 10px; width: 100%; padding: 11px 13px; border-radius: 14px; cursor: pointer;
    background: #fff; border: 1px solid var(--line); color: var(--ink); font-family: inherit; font-size: 13.5px; font-weight: 600; text-align: left;
    transition: border-color .15s, transform .15s, box-shadow .15s;
  }
  .arc-quick button:hover { border-color: #93c5fd; transform: translateX(2px); box-shadow: 0 6px 16px -12px rgba(29,78,216,.6); }
  .arc-quick .qi { flex: none; width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; background: #eff6ff; font-size: 15px; }
  .arc-quick .qa { margin-left: auto; color: #94a3b8; }

  .arc-contact { display: none; margin: 4px 0 2px; padding: 13px; border-radius: 16px; background: linear-gradient(135deg, #fffbeb, #fff7ed); border: 1px solid #fde68a; }
  .arc-contact.show { display: block; animation: arc-in .25s ease; }
  .arc-contact b { display: block; font-size: 13.5px; color: #92400e; }
  .arc-contact p { margin: 3px 0 10px; font-size: 12.5px; color: #a16207; }
  .arc-contact-row { display: flex; gap: 6px; }
  .arc-contact input { flex: 1; min-width: 0; border: 1.5px solid #fcd34d; border-radius: 11px; padding: 9px 11px; font: inherit; font-size: 13.5px; background: #fff; }
  .arc-contact input:focus { outline: none; border-color: #f59e0b; }
  .arc-contact button { border: 0; border-radius: 11px; padding: 0 14px; background: #f59e0b; color: #fff; font-weight: 800; cursor: pointer; font-family: inherit; }

  .arc-foot { padding: 10px 12px 12px; background: #fff; border-top: 1px solid var(--line); }
  .arc-input { display: flex; align-items: flex-end; gap: 8px; padding: 6px 6px 6px 14px; border: 1.5px solid var(--line); border-radius: 18px; transition: border-color .15s, box-shadow .15s; }
  .arc-input:focus-within { border-color: var(--c1); box-shadow: 0 0 0 4px rgba(14,165,233,.12); }
  .arc-input textarea { flex: 1; min-width: 0; border: 0; outline: none; resize: none; padding: 8px 0; max-height: 120px; height: 38px;
    font: inherit; font-size: 14.5px; line-height: 1.45; color: var(--ink); background: transparent; }
  .arc-send { flex: none; width: 40px; height: 40px; border: 0; border-radius: 13px; cursor: pointer; display: grid; place-items: center;
    color: #fff; background: linear-gradient(135deg, var(--c1), var(--c2)); transition: transform .15s, opacity .15s; }
  .arc-send:hover { transform: scale(1.05); }
  .arc-send[disabled] { opacity: .4; transform: none; cursor: default; }
  .arc-send svg { width: 18px; height: 18px; }
  .arc-brand { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-top: 8px; font-size: 11.5px; color: #94a3b8; }
  .arc-brand a { color: #0369a1; font-weight: 700; text-decoration: none; display: inline-flex; align-items: center; gap: 4px; }
  .arc-brand a svg { width: 13px; height: 13px; }

  /* movement only: if the animation never runs (background tab) the content is still visible */
  @keyframes arc-in { from { transform: translateY(6px); } to { transform: none; } }
  @keyframes arc-blink { 0%, 80%, 100% { opacity: .3; transform: translateY(0); } 40% { opacity: 1; transform: translateY(-2px); } }

  @media (max-width: 760px) {
    .arc-launch { right: 14px; bottom: 14px; padding: 6px; }
    .arc-launch-txt { display: none; }
    body:has(.mobile-buy) .arc-launch { bottom: 90px; }
    .arc-panel { right: 0; left: 0; bottom: 0; width: 100%; height: 100%; height: 100dvh; border-radius: 0; transform: translateY(40px); }
    .arc-head { padding-top: calc(16px + env(safe-area-inset-top)); }
    .arc-foot { padding-bottom: calc(12px + env(safe-area-inset-bottom)); }
  }
  @media (prefers-reduced-motion: reduce) { .arc-panel, .arc-row, .arc-launch { transition: none; animation: none; } }