/* ── Chat ───────────────────────────────────────────── */
    #chat {
      flex: 1; overflow-y: auto; overflow-x: hidden; padding: 20px 24px;
      display: flex; flex-direction: column; gap: 14px;
    }
    .msg {
      max-width: 1200px; padding: 12px 18px; border-radius: 10px;
      line-height: 1.5; font-size: 15px; white-space: pre-wrap; word-break: break-word;
      box-sizing: border-box;
    }
    .msg.user { align-self: flex-end; background: var(--accent-dim); border-bottom-right-radius: 4px; }
    .msg.assistant { align-self: flex-start; background: var(--surface); border: 1px solid var(--border); border-bottom-left-radius: 4px; max-width: 100%; }
    .msg.compact { width: fit-content; min-width: 240px; max-width: 480px; white-space: normal; box-sizing: border-box; }
    .msg.system { align-self: center; color: var(--muted); font-size: 13px; background: none; padding: 2px 0; white-space: normal; }
    .msg .tool-call {
      margin-top: 8px; padding: 8px 14px; background: rgba(0,0,0,0.3); border-radius: 6px;
      font-family: 'SF Mono', 'Fira Code', monospace; font-size: 13px; color: var(--warn);
    }
    .msg .tool-result {
      margin-top: 8px; padding: 8px 14px; background: rgba(63,185,80,0.1); border: 1px solid rgba(63,185,80,0.3);
      border-radius: 6px; font-family: 'SF Mono', 'Fira Code', monospace; font-size: 13px; color: var(--success);
    }
    .msg .error-result { background: rgba(248,81,73,0.1); border-color: rgba(248,81,73,0.3); color: var(--error); }
    .typing .msg-content { color: var(--muted); font-style: italic; }
    .typing .msg-content::after { content: ' ▋'; animation: blink 1s step-end infinite; }
    @keyframes blink { 50% { opacity: 0; } }

    /* ── Rich message content (tables, links) ───────────── */
    .msg.assistant .msg-content a {
      color: var(--accent); text-decoration: none; word-break: break-all;
    }
    .msg.assistant .msg-content a:hover { text-decoration: underline; }
    .msg.assistant .msg-content {
      overflow-x: auto;
      max-width: 100%;
    }
    .msg.assistant .msg-content table {
      border-collapse: collapse; margin: 8px 0; font-size: 14px;
      white-space: nowrap;
    }
    .msg.assistant .msg-content th,
    .msg.assistant .msg-content td {
      padding: 4px 12px; border: 1px solid var(--border); text-align: left;
    }
    .msg.assistant .msg-content th {
      background: var(--bg); font-weight: 600; font-size: 13px; color: var(--muted);
    }
    .msg.assistant .msg-content td { font-size: 13px; }
    .msg.assistant .msg-content pre {
      overflow-x: auto;
    }

    /* ── Suggestion chips ───────────────────────────────── */
    .suggestions {
      display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; padding-top: 8px;
      border-top: 1px solid var(--border);
    }
    .suggestion-chip {
      font-size: 13px; padding: 6px 14px; border-radius: 14px;
      border: 1px solid var(--accent-dim); background: rgba(31, 111, 235, 0.08);
      color: var(--accent); cursor: pointer; font-weight: 500;
      transition: background 0.15s, border-color 0.15s;
    }
    .suggestion-chip:hover {
      background: rgba(31, 111, 235, 0.18); border-color: var(--accent);
    }

    /* ── Reasoning trace (collapsible) ─────────────────── */
    .reasoning-block {
      margin-bottom: 8px; border: 1px solid rgba(210, 153, 34, 0.25);
      border-radius: 8px; overflow: hidden; background: rgba(210, 153, 34, 0.04);
    }
    .reasoning-toggle {
      display: flex; align-items: center; gap: 6px; padding: 8px 12px;
      cursor: pointer; font-size: 13px; color: var(--warn); user-select: none;
      background: none; border: none; width: 100%; text-align: left;
      font-family: inherit;
    }
    .reasoning-toggle:hover { background: rgba(210, 153, 34, 0.08); }
    .reasoning-toggle .arrow { transition: transform 0.2s; display: inline-block; }
    .reasoning-toggle .arrow.open { transform: rotate(90deg); }
    .reasoning-content {
      padding: 0 12px 10px; font-size: 13px; line-height: 1.6;
      color: var(--muted); white-space: pre-wrap; word-break: break-word;
      max-height: 300px; overflow-y: auto; overflow-x: hidden; display: none;
    }
    .reasoning-content.open { display: block; }
    .model-trace {
      margin-top: 6px;
      font-size: 11px;
      line-height: 1.4;
      color: var(--muted);
      opacity: 0.85;
      letter-spacing: 0.01em;
    }

    /* ── GMX Position Actions ───────────────────────────── */
    .gmx-refresh-btn {
      font-size: 11px; padding: 2px 8px; border-radius: 4px;
      border: 1px solid transparent; background: transparent;
      color: var(--muted); cursor: pointer; font-weight: 400;
      margin-bottom: 4px; transition: color 0.15s;
      display: inline-flex; align-items: center; gap: 4px;
    }
    .gmx-refresh-btn:hover {
      color: var(--accent); text-decoration: underline;
    }
    .gmx-interactive-cell {
      position: relative;
    }
    .gmx-interactive-cell::after {
      content: '⋮'; margin-left: 4px; opacity: 0.5; font-size: 11px;
    }
    .gmx-interactive-cell:hover::after {
      opacity: 1; color: var(--accent);
    }
    .gmx-cell-menu {
      display: none; position: absolute; z-index: 10;
      background: var(--surface); border: 1px solid var(--border);
      border-radius: 6px; box-shadow: 0 4px 12px rgba(0,0,0,0.3);
      padding: 4px; min-width: 140px; top: 100%; left: 0;
    }
    .gmx-menu-item {
      display: block; width: 100%; text-align: left;
      padding: 6px 10px; border: none; border-radius: 4px;
      background: none; color: var(--text); font-size: 13px;
      cursor: pointer; font-family: inherit;
    }
    .gmx-menu-item:hover {
      background: rgba(88, 166, 255, 0.12);
    }
    .gmx-menu-item.disabled {
      opacity: 0.5; cursor: not-allowed;
    }
    .gmx-action-btn {
      font-size: 12px; padding: 2px 8px; border-radius: 4px;
      border: 1px solid var(--error); background: rgba(248, 81, 73, 0.08);
      color: var(--error); cursor: pointer; font-weight: 500;
      transition: background 0.15s;
    }
    .gmx-action-btn:hover {
      background: rgba(248, 81, 73, 0.18);
    }

    /* ── Input ──────────────────────────────────────────── */
    #input-area { padding: 12px 24px 20px; }
    #input-wrapper { position: relative; }
    #input-area textarea {
      width: 100%; box-sizing: border-box;
      background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
      color: var(--text); padding: 12px 50px 12px 16px; font-size: 15px; font-family: inherit;
      resize: none; outline: none; min-height: 100px; max-height: 200px;
    }
    #input-area textarea:focus { border-color: var(--accent); }
    #send {
      position: absolute; bottom: 12px; right: 12px;
      width: 40px; height: 40px; border-radius: 50%;
      background: var(--accent); border: none; cursor: pointer;
      display: flex; align-items: center; justify-content: center;
      transition: background 0.15s;
    }
    #send:hover { background: #1a7aff; }
    #send:disabled { opacity: 0.4; cursor: not-allowed; }
    #send.stopping { background: #dc2626; }
    #send.stopping:hover { background: #b91c1c; }