:root {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background: #0f172a;
      color: #e5e7eb;
    }

    body {
      margin: 0;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      background: radial-gradient(circle at top, #1e293b 0, #020617 55%);
    }

    .app {
      width: 100%;
      max-width: 1400px;
      margin: 0 auto;
      padding: 16px 16px 20px;
      display: flex;
      flex-direction: row;
      height: 100vh;
      box-sizing: border-box;
      gap: 16px;
    }

    /* Sidebar for history */
    .sidebar {
      width: 260px;
      flex-shrink: 0;
      display: flex;
      flex-direction: column;
      background: rgba(15, 23, 42, 0.95);
      border-radius: 16px;
      border: 1px solid rgba(148, 163, 184, 0.35);
      padding: 12px;
      box-sizing: border-box;
    }

    .sidebar-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 8px;
    }

    .sidebar-title {
      font-size: 0.85rem;
      font-weight: 600;
      color: #e5e7eb;
    }

    .new-chat-btn {
      border: none;
      border-radius: 9999px;
      padding: 4px 10px;
      font-size: 0.75rem;
      font-weight: 500;
      cursor: pointer;
      background: #22c55e;
      color: #022c22;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      white-space: nowrap;
    }

    .history-list {
      flex: 1;
      overflow-y: auto;
      margin-top: 4px;
      padding-right: 4px;
      scrollbar-width: thin;
    }

    .history-item {
      padding: 6px 8px;
      border-radius: 10px;
      font-size: 0.8rem;
      cursor: pointer;
      margin-bottom: 4px;
      color: #e5e7eb;
      border: 1px solid transparent;
      display: flex;
      flex-direction: row;
      align-items: center;
      gap: 6px;
      transition: background 0.12s ease, border-color 0.12s ease;
    }

    .history-item-main {
      display: flex;
      flex-direction: column;
      gap: 2px;
      flex: 1;
      min-width: 0;
    }

    .history-item-title {
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .history-item-time {
      font-size: 0.7rem;
      color: #9ca3af;
    }

    .history-item:hover {
      background: #020617;
      border-color: rgba(148, 163, 184, 0.6);
    }

    .history-item.active {
      background: #22c55e1a;
      border-color: #22c55e;
    }

    .history-item-delete {
      border: none;
      background: transparent;
      color: #9ca3af;
      cursor: pointer;
      font-size: 0.8rem;
      padding: 0 4px;
      flex-shrink: 0;
    }

    .history-item-delete:hover {
      color: #f97373;
    }

    /* Main chat panel */
    .main-panel {
      flex: 1;
      display: flex;
      flex-direction: column;
      background: rgba(15, 23, 42, 0.92);
      border-radius: 16px;
      border: 1px solid rgba(148, 163, 184, 0.35);
      padding: 12px 16px 10px;
      box-sizing: border-box;
      min-width: 0;
    }

    .header {
      padding: 4px 0 10px;
      border-bottom: 1px solid rgba(148, 163, 184, 0.4);
      margin-bottom: 8px;
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: 8px;
    }

    .header-title {
      font-size: 1.3rem;
      font-weight: 600;
    }

    .header-subtitle {
      font-size: 0.8rem;
      color: #9ca3af;
    }

    .status {
      font-size: 0.75rem;
      color: #22c55e;
      white-space: nowrap;
    }

    .status.error {
      color: #f97373;
    }

    .chat {
      flex: 1;
      overflow-y: auto;
      padding: 8px 2px 8px 0;
      margin-bottom: 8px;
      scrollbar-width: thin;
      scroll-behavior: smooth;
    }

    .msg-row {
      display: flex;
      margin-bottom: 8px;
    }

    .msg-row.user {
      justify-content: flex-end;
    }

    .msg-bubble {
      max-width: 80%;
      padding: 8px 12px;
      border-radius: 16px;
      font-size: 0.9rem;
      line-height: 1.4;
      white-space: pre-wrap;
    }

    .msg-row.user .msg-bubble {
      background: #22c55e;
      color: #022c22;
      border-bottom-right-radius: 4px;
    }

    .msg-row.assistant .msg-bubble {
      background: #111827;
      border: 1px solid rgba(55, 65, 81, 0.9);
      border-bottom-left-radius: 4px;
    }

    .msg-label {
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      margin-bottom: 3px;
      color: #9ca3af;
    }

    /* NEW: make the "You" label red for user messages */
    .msg-row.user .msg-label {
      color: #f97373;
      font-weight: 700;
    }

    .input-area {
      border-top: 1px solid rgba(148, 163, 184, 0.3);
      padding-top: 10px;
      margin-top: 2px;
      display: flex;
      gap: 8px;
    }

    textarea {
      flex: 1;
      resize: none;
      min-height: 60px;
      max-height: 140px;
      padding: 8px;
      border-radius: 10px;
      border: 1px solid rgba(148, 163, 184, 0.7);
      background: #020617;
      color: #e5e7eb;
      font-size: 0.9rem;
      font-family: inherit;
      box-sizing: border-box;
    }

    textarea:focus {
      outline: none;
      border-color: #22c55e;
      box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.6);
    }

    button {
      border: none;
      border-radius: 9999px;
      padding: 0 18px;
      font-size: 0.9rem;
      font-weight: 500;
      cursor: pointer;
      background: #22c55e;
      color: #022c22;
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
      height: 40px;
      align-self: flex-end;
    }

    button:disabled {
      opacity: 0.5;
      cursor: wait;
    }

    .small {
      font-size: 0.75rem;
      color: #9ca3af;
      margin-top: 4px;
    }

    .loading-dots span {
      display: inline-block;
      animation: blink 1.2s infinite both;
    }

    .loading-dots span:nth-child(2) { animation-delay: 0.2s; }
    .loading-dots span:nth-child(3) { animation-delay: 0.4s; }

    @keyframes blink {
      0%, 80%, 100% { opacity: 0; }
      40% { opacity: 1; }
    }

    /* Tablet / small desktop tweaks */
    @media (max-width: 1100px) {
      .app {
        padding: 12px;
        gap: 12px;
      }
      .sidebar {
        width: 230px;
      }
    }

    /* Mobile & very small screens */
    @media (max-width: 900px) {
      .app {
        flex-direction: column;
        height: auto;
      }
      .sidebar {
        width: 100%;
        flex-direction: column;
        height: auto;
        max-height: 200px;
      }
      .main-panel {
        padding: 10px 12px 8px;
      }
      .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
      }
      .status {
        margin-top: 2px;
      }
    }

    @media (max-width: 600px) {
      .app {
        padding: 10px 8px 14px;
      }
      .header-title {
        font-size: 1.05rem;
      }
      textarea {
        font-size: 0.85rem;
      }
      .msg-bubble {
        max-width: 100%;
      }
    }