:root {
      --bg: #0b0d10;
      --bg-soft: #111418;
      --card: rgba(255,255,255,0.06);
      --text: #eef2f6;
      --muted: #9aa4b2;
      --brand: #ff6600;
      --brand-700: #e65c00;
      --ring: rgba(255, 102, 0, 0.35);
      --bot: rgba(255,255,255,0.08);
      --user-grad-1: #ff8a3d;
      --user-grad-2: #ff5a00;
      --scrollbar: rgba(255,255,255,0.15);
    }
    @media (prefers-color-scheme: light) {
      :root {
        --bg: #fff8f0;
        --bg-soft: #fff1e6;
        --card: #ffffff;
        --text: #20262d;
        --muted: #5a6675;
        --bot: #f3f4f6;
        --scrollbar: rgba(0,0,0,0.2);
      }
    }
    /* Light theme override when toggled */
    [data-theme="light"] {
      --bg: #fff8f0;
      --bg-soft: #fff1e6;
      --card: #ffffff;
      --text: #20262d;
      --muted: #5a6675;
      --bot: #f3f4f6;
      --scrollbar: rgba(0,0,0,0.2);
    }
    /* Dark theme override when toggled */
    [data-theme="dark"] {
      --bg: #0b0d10;
      --bg-soft: #111418;
      --card: rgba(255,255,255,0.06);
      --text: #eef2f6;
      --muted: #9aa4b2;
      --bot: rgba(255,255,255,0.08);
      --scrollbar: rgba(255,255,255,0.15);
    }

    * { box-sizing: border-box; }
    html, body { height: 100%; }
    body {
      margin: 0;
      font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
      background:
        radial-gradient(1200px 800px at 10% -10%, rgba(255, 102, 0, 0.12), transparent 50%),
        radial-gradient(1000px 600px at 90% 110%, rgba(255, 102, 0, 0.10), transparent 50%),
        var(--bg);
      color: var(--text);
      display: grid;
      place-items: center;
      padding: 24px;
    }

    .app {
      width: min(880px, 100%);
      backdrop-filter: saturate(140%) blur(10px);
      background: var(--card);
      border-radius: 20px;
      box-shadow:
        0 1px 0 0 rgba(255,255,255,0.06) inset,
        0 10px 30px -10px rgba(0,0,0,0.35),
        0 0 0 1px rgba(255,255,255,0.05);
      overflow: hidden;
    }

    .header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 20px;
      background: linear-gradient(180deg, rgba(255,255,255,0.06), transparent);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .title {
      display: flex; gap: 12px; align-items: center;
      font-weight: 700;
      letter-spacing: 0.2px;
    }
    .logo {
      width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
      background: linear-gradient(135deg, var(--user-grad-1), var(--user-grad-2));
      box-shadow: 0 8px 22px -10px var(--ring);
    }
    .status {
      display: inline-flex; gap: 8px; align-items: center; font-size: 12px; color: var(--muted);
    }
    .status .dot { width: 8px; height: 8px; border-radius: 999px; background: #2ecc71; box-shadow: 0 0 0 6px rgba(46, 204, 113, 0.15); }

    .toolbar {
      display: flex; gap: 8px; align-items: center;
    }
    .icon-btn {
      appearance: none; border: 0; background: transparent; color: var(--muted);
      padding: 8px; border-radius: 10px; cursor: pointer;
    }
    .icon-btn:hover { background: rgba(255,255,255,0.08); color: var(--text); }

    .chat {
      display: flex; flex-direction: column; gap: 12px;
      height: min(62vh, 560px);
      overflow: auto; padding: 20px; scroll-behavior: smooth;
    }
    .chat::-webkit-scrollbar { width: 8px; }
    .chat::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 999px; }

    .row { display: flex; gap: 10px; align-items: flex-end; }
    .row.user { justify-content: flex-end; }
    .avatar {
      width: 32px; height: 32px; border-radius: 10px; flex: 0 0 32px; display: grid; place-items: center;
      background: var(--bg-soft); color: var(--muted); border: 1px solid rgba(255,255,255,0.08);
    }
    .bubble {
      max-width: min(75%, 600px);
      padding: 10px 14px; border-radius: 16px; position: relative;
      line-height: 1.45; font-size: 15px;
      box-shadow: 0 10px 25px -18px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.06) inset;
      animation: pop 160ms ease-out;
      word-wrap: break-word; white-space: pre-wrap;
    }
    .row.user .bubble {
      color: #fff; background: linear-gradient(135deg, var(--user-grad-1), var(--user-grad-2));
    }
    .row.bot .bubble {
      background: var(--bot);
    }
    .meta { font-size: 11px; color: var(--muted); margin-top: 4px; user-select: none; }

    @keyframes pop { from { transform: translateY(6px) scale(.98); opacity: 0 } to { transform: translateY(0) scale(1); opacity: 1 } }

    .composer {
      padding: 14px; display: grid; grid-template-columns: 1fr auto; gap: 10px;
      border-top: 1px solid rgba(255,255,255,0.08);
      background: linear-gradient(0deg, rgba(255,255,255,0.06), transparent);
    }
    .input {
      display: flex; gap: 10px; align-items: center; background: var(--card);
      border: 1px solid rgba(255,255,255,0.12); border-radius: 14px; padding: 10px 12px;
      box-shadow: 0 1px 0 0 rgba(255,255,255,0.05) inset;
    }
    textarea {
      resize: none; border: 0; outline: 0; background: transparent; color: var(--text);
      font: 500 15px Inter, system-ui, sans-serif; width: 100%; max-height: 200px;
    }
    .send-btn {
      appearance: none; border: 0; cursor: pointer; border-radius: 12px;
      background: linear-gradient(135deg, var(--user-grad-1), var(--user-grad-2)); color: #fff;
      padding: 12px 16px; font-weight: 600; letter-spacing: .2px;
      display: inline-flex; align-items: center; gap: 8px;
      box-shadow: 0 10px 24px -12px var(--ring);
      transition: transform .06s ease, box-shadow .2s ease;
    }
    .send-btn[disabled] { opacity: .6; cursor: not-allowed; box-shadow: none; }
    .send-btn:hover:not([disabled]) { transform: translateY(-1px); box-shadow: 0 16px 30px -14px var(--ring); }

    .typing {
      display: inline-flex; gap: 6px; align-items: center;
    }
    .dot { width: 6px; height: 6px; border-radius: 999px; background: var(--muted); opacity: .6; animation: pulse 1.4s infinite; }
    .dot:nth-child(2) { animation-delay: .2s }
    .dot:nth-child(3) { animation-delay: .4s }
    @keyframes pulse { 0% { opacity: .2; transform: translateY(0) } 50% { opacity: .8; transform: translateY(-2px) } 100% { opacity: .2; transform: translateY(0) } }

    .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

    .pill {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 6px 10px; border-radius: 999px; font-size: 12px; color: var(--muted);
      background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.08);
    }
    .kbd { font-variant-numeric: lining-nums; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

    .footer-note { text-align: center; color: var(--muted); font-size: 12px; padding: 10px 0 14px; }
    .link { color: var(--brand); text-decoration: none; }
    .link:hover { text-decoration: underline; }

    .easy_ass1 {
  font-size: 16px;
  font-weight: 600;
  }