:root {
      --bg: #0d1117; --surface: #161b22; --border: #30363d;
      --text: #e6edf3; --muted: #8b949e; --accent: #58a6ff;
      --accent-dim: #1f6feb; --success: #3fb950; --warn: #d29922; --error: #f85149;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { overflow: hidden; height: 100%; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
      background: var(--bg); color: var(--text);
      height: 100%; height: 100dvh; display: flex; flex-direction: column;
      overflow: hidden; width: 100%; max-width: 100vw;
    }

    /* ── Header ─────────────────────────────────────────── */
    header {
      padding: 10px 24px; border-bottom: 1px solid var(--border);
      display: flex; align-items: center; gap: 12px; flex-wrap: nowrap;
    }
    header h1 { font-size: 18px; font-weight: 600; white-space: nowrap; }
    .header-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; flex-wrap: nowrap; }
    .btn-sm {
      font-size: 13px; padding: 7px 14px; border-radius: 6px;
      border: 1px solid var(--border); background: var(--surface);
      color: var(--text); cursor: pointer; font-weight: 500;
      transition: background 0.15s, border-color 0.15s;
    }
    .btn-sm:hover { border-color: var(--accent); }
    .btn-sm.active { border-color: var(--success); color: var(--success); }
    .btn-icon {
      background: none; border: none; color: var(--muted); cursor: pointer;
      padding: 6px; border-radius: 6px; display: flex; align-items: center;
      transition: color 0.15s;
    }
    .btn-icon:hover { color: var(--text); }
    .addr { font-family: 'SF Mono', 'Fira Code', monospace; font-size: 13px; color: var(--muted); }

    /* ── Settings modal sections ─────────────────────── */
    .settings-section {
      padding: 16px 0; border-bottom: 1px solid var(--border);
    }
    .settings-section:last-child { border-bottom: none; }
    .settings-section h4 {
      font-size: 13px; color: var(--muted); text-transform: uppercase;
      letter-spacing: 0.5px; margin-bottom: 12px;
    }
    .settings-row {
      display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
    }
    .settings-row label { font-size: 13px; color: var(--muted); white-space: nowrap; }
    .settings-row input {
      background: var(--bg); border: 1px solid var(--border); border-radius: 5px;
      color: var(--text); padding: 6px 10px; font-size: 13px; outline: none;
      font-family: 'SF Mono', 'Fira Code', monospace;
    }
    .settings-row input:focus { border-color: var(--accent); }
    #vault-input { width: 100%; max-width: 100%; box-sizing: border-box; }
    .chain-badge {
      display: inline-flex; align-items: center; font-size: 12px;
      padding: 4px 10px; border-radius: 5px;
      background: rgba(88, 166, 255, 0.1); color: var(--accent);
      font-family: 'SF Mono', 'Fira Code', monospace;
      border: 1px solid rgba(88, 166, 255, 0.2);
    }
    .vault-info-badge {
      font-size: 11px; padding: 3px 8px; border-radius: 4px;
      background: rgba(63,185,80,0.1); color: var(--success);
      font-family: 'SF Mono', 'Fira Code', monospace;
    }
    .vault-info-badge:empty { display: none; }
    .vault-info-badge.error { background: rgba(248,81,73,0.1); color: var(--error); }
    @keyframes spin { to { transform: rotate(360deg); } }
    .spinner {
      display: inline-block; width: 16px; height: 16px;
      border: 2px solid var(--border); border-top-color: var(--accent);
      border-radius: 50%; animation: spin 0.8s linear infinite;
    }
    .saved-vaults-btn {
      font-size: 14px; padding: 5px 10px; border-radius: 5px;
      border: 1px solid var(--border); background: var(--bg);
      color: var(--muted); cursor: pointer;
    }
    .saved-vaults-btn:hover { color: var(--text); border-color: var(--accent); }

    /* ── Testnet toggle ──────────────────────────────────── */
    .testnet-toggle {
      display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--muted);
      cursor: pointer; user-select: none;
    }
    .testnet-toggle input { display: none; }
    .testnet-toggle .toggle-track {
      width: 48px; height: 28px; background: var(--border); border-radius: 14px;
      position: relative; transition: background 0.2s;
    }
    .testnet-toggle .toggle-track::after {
      content: ''; width: 22px; height: 22px; background: var(--muted); border-radius: 50%;
      position: absolute; top: 3px; left: 3px; transition: transform 0.2s, background 0.2s;
    }
    .testnet-toggle input:checked + .toggle-track {
      background: var(--warn);
    }
    .testnet-toggle input:checked + .toggle-track::after {
      transform: translateX(20px); background: #000;
    }

    /* ── Trading params grid ─────────────────────────────── */
    .trading-params-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }
    @media (max-width: 520px) {
      .trading-params-grid { grid-template-columns: 1fr; }
    }
    .trading-param label {
      font-size: 13px;
      color: var(--muted);
      display: block;
      margin-bottom: 6px;
    }
    .param-input-wrap {
      display: flex;
      gap: 6px;
      align-items: center;
    }
    .param-input-wrap input {
      flex: 1;
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 8px;
      color: var(--text);
      padding: 8px 10px;
      font-size: 15px;
      outline: none;
      min-width: 0;
    }
    .param-input-wrap input:focus { border-color: var(--accent); }
    .param-input-wrap span { color: var(--muted); font-size: 15px; }

    /* ── Tooltip ─────────────────────────────────────────── */
    .tooltip {
      position: relative;
      cursor: help;
      color: var(--muted);
      font-size: 13px;
      margin-left: 2px;
    }
    .tooltip::after {
      content: attr(data-tooltip);
      position: absolute;
      bottom: 130%;
      left: 50%;
      transform: translateX(-50%);
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 8px 12px;
      font-size: 12px;
      color: var(--text);
      white-space: normal;
      max-width: 260px;
      overflow-wrap: break-word;
      display: block;
      text-align: left;
      z-index: 200;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.15s;
      box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }
    .tooltip:hover::after {
      opacity: 1;
    }

    /* ── Mobile responsiveness ───────────────────────────── */
    @media (max-width: 640px) {
      header { padding: 8px 12px; gap: 6px; }
      header h1 { font-size: 13px; }
      header svg { width: 20px; height: 20px; }
      .header-actions { gap: 6px; }
      .chain-badge { font-size: 11px; padding: 3px 8px; }
      #chat { padding: 10px; gap: 10px; }
      .msg { max-width: 100%; padding: 8px 10px; font-size: 13px; }
      .msg .tool-result { font-size: 11px; padding: 6px 8px; }
      .msg.assistant .msg-content table { font-size: 11px; }
      .msg.assistant .msg-content th,
      .msg.assistant .msg-content td { padding: 3px 6px; font-size: 11px; }
      .suggestion-chip { font-size: 11px; padding: 5px 10px; }
      #input-area { padding: 8px 10px; }
      #input-area textarea { padding: 10px 48px 10px 12px; font-size: 16px; min-height: 44px; }
      #send { width: 32px; height: 32px; bottom: 8px; right: 8px; }
      #send svg { width: 18px; height: 18px; }
      .modal-content { padding: 16px; border-radius: 10px; }
      .modal-content h3 { font-size: 15px; margin-bottom: 12px; }
      .tx-detail { padding: 8px; font-size: 12px; margin-bottom: 12px; }
      .tx-detail .row { flex-direction: column; gap: 2px; }
      .tx-detail .value { max-width: 100%; text-align: left; font-size: 11px; }
      .tx-actions { flex-direction: column; gap: 8px; }
      .tx-actions .btn-confirm, .tx-actions .btn-cancel { padding: 12px; font-size: 14px; }
      .addr { font-size: 10px; }
      .btn-sm { font-size: 11px; padding: 5px 8px; }
      .vault-info-badge { font-size: 10px; }
      .wallet-option { padding: 10px; gap: 10px; }
      .wallet-option img { width: 28px; height: 28px; }
      .wallet-option .wallet-name { font-size: 13px; }
      .delegated-confirm .row { flex-direction: column; gap: 4px; }
      .delegated-confirm .confirm-btn, .delegated-confirm .reject-btn { padding: 10px; font-size: 13px; }
    }
    @media (max-width: 400px) {
      header h1 { font-size: 12px; letter-spacing: -0.3px; }
      .header-actions { gap: 4px; }
      .chain-badge { font-size: 10px; padding: 2px 6px; }
      .msg { padding: 6px 8px; font-size: 12px; }
      .suggestion-chip { font-size: 10px; padding: 4px 8px; }
      #input-area textarea { font-size: 16px; padding: 8px 10px; }
    }

    /* ── Desktop: narrow centered chat ─────────────── */
    @media (min-width: 1200px) {
      body {
        width: 55%; max-width: 800px; margin: 0 auto;
        border-left: 1px solid var(--border); border-right: 1px solid var(--border);
      }
    }
      header h1 { display: none; }
    }