@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@300;400;500&family=IBM+Plex+Sans:wght@300;400&display=swap');

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --bg: #0e0e10;
      --surface: #17171a;
      --border: #2a2a2f;
      --text: #e6e6e8;
      --muted: #8a8a92;
      --accent: #7a9bb8;
      --accent-dim: rgba(122,155,184,0.12);
      --red: #c87070;
      --font-mono: 'IBM Plex Mono', monospace;
      --font-sans: 'IBM Plex Sans', sans-serif;
    }

    html, body {
      height: 100%;
      background: var(--bg);
      color: var(--text);
      font-family: var(--font-sans);
      font-weight: 300;
      -webkit-font-smoothing: antialiased;
    }

    body {
      display: flex;
      flex-direction: column;
      min-height: 100dvh;
      padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
    }

    header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      gap: 12px;
    }

    .header-btn {
      background: transparent;
      border: 1px solid var(--border);
      color: var(--text);
      font-family: var(--font-mono);
      font-size: 11px;
      letter-spacing: 0.1em;
      padding: 6px 10px;
      border-radius: 4px;
      cursor: pointer;
      text-transform: uppercase;
      -webkit-tap-highlight-color: transparent;
    }
    .header-btn:hover { border-color: var(--accent); color: var(--accent); }
    .header-btn.muted { color: var(--red); border-color: var(--red); }

    .header-center { flex: 1; text-align: center; }

    .new-conv-btn {
      align-self: center;
      background: transparent;
      border: 1px solid var(--border);
      color: var(--muted);
      font-family: var(--font-mono);
      font-size: 10px;
      letter-spacing: 0.12em;
      padding: 6px 14px;
      border-radius: 4px;
      cursor: pointer;
      text-transform: uppercase;
      -webkit-tap-highlight-color: transparent;
    }
    .new-conv-btn:hover { border-color: var(--accent); color: var(--accent); }

    .logo {
      font-family: var(--font-mono);
      font-size: 13px;
      letter-spacing: 0.15em;
      color: var(--accent);
      text-transform: uppercase;
    }

    .logo-btn {
      background: none;
      border: none;
      cursor: pointer;
      padding: 0;
    }
    .logo-btn:focus-visible {
      outline: 1px solid var(--accent);
      outline-offset: 4px;
    }

    .auth-overlay[hidden] {
      display: none;
    }
    .auth-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.85);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
      z-index: 100;
    }
    .auth-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 24px;
      max-width: 380px;
      width: 100%;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .auth-card h2 {
      font-family: var(--font-mono);
      font-size: 14px;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: var(--accent);
      font-weight: 400;
    }
    .auth-card p {
      font-size: 14px;
      color: var(--muted);
      line-height: 1.5;
    }
    .auth-label {
      font-family: var(--font-mono);
      font-size: 11px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--muted);
      margin-top: 4px;
    }
    .auth-card input {
      background: var(--bg);
      border: 1px solid var(--border);
      color: var(--text);
      padding: 10px 12px;
      border-radius: 4px;
      font-family: var(--font-mono);
      font-size: 14px;
    }
    .auth-card input:focus {
      outline: none;
      border-color: var(--accent);
    }
    .auth-error {
      color: var(--red);
      font-size: 13px;
    }
    .auth-submit {
      background: var(--accent);
      color: var(--bg);
      border: none;
      padding: 12px;
      border-radius: 4px;
      font-family: var(--font-mono);
      font-size: 13px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      cursor: pointer;
      margin-top: 4px;
    }
    .auth-submit:active {
      transform: translateY(1px);
    }
    .auth-hint {
      font-size: 12px;
      color: var(--muted);
      text-align: center;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--muted);
      transition: background 0.3s;
    }
    .status-dot.online { background: var(--accent); }
    .status-dot.error { background: var(--red); }
    .status-dot.sending { background: var(--accent); animation: pulse 1.2s ease infinite; }

    main {
      flex: 1;
      overflow-y: auto;
      padding: 20px;
      display: flex;
      flex-direction: column;
      gap: 16px;
      scroll-behavior: smooth;
    }

    .message {
      max-width: 88%;
      animation: fadeUp 0.2s ease;
    }
    .message.user { align-self: flex-end; }
    .message.assistant { align-self: flex-start; }

    .message-label {
      font-family: var(--font-mono);
      font-size: 10px;
      letter-spacing: 0.1em;
      color: var(--muted);
      text-transform: uppercase;
      margin-bottom: 5px;
    }
    .message.user .message-label { text-align: right; }

    .message-bubble {
      padding: 12px 16px;
      border-radius: 4px;
      font-size: 15px;
      line-height: 1.6;
      white-space: pre-wrap;
      word-break: break-word;
    }
    .message.user .message-bubble {
      background: var(--accent-dim);
      border: 1px solid var(--accent-dim);
      color: var(--text);
      font-family: var(--font-mono);
      font-size: 13px;
    }
    .message.assistant .message-bubble {
      background: var(--surface);
      border: 1px solid var(--border);
    }

    .typing .message-bubble::after {
      content: '▋';
      animation: blink 1s step-end infinite;
    }

    .empty-state {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 12px;
      color: var(--muted);
      font-family: var(--font-mono);
      font-size: 12px;
      letter-spacing: 0.05em;
    }

    .empty-hint {
      font-size: 11px;
      opacity: 0.6;
    }

    footer {
      padding: 16px 20px 20px;
      border-top: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .transcript-box {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 4px;
      padding: 10px 14px;
      font-family: var(--font-mono);
      font-size: 13px;
      color: var(--muted);
      min-height: 44px;
      line-height: 1.5;
      transition: border-color 0.2s, color 0.2s;
    }
    .transcript-box.active {
      border-color: var(--accent);
      color: var(--text);
    }
    .transcript-box[contenteditable="true"] {
      border-color: var(--accent);
      color: var(--text);
      cursor: text;
      outline: none;
      caret-color: var(--accent);
      white-space: pre-wrap;
      word-break: break-word;
    }

    .action-row {
      display: flex;
      gap: 10px;
      align-items: stretch;
    }
    .action-row .mic-btn { flex: 1; }

    .discard-btn {
      width: 64px;
      height: 64px;
      flex: 0 0 auto;
      border-radius: 4px;
      background: var(--surface);
      border: 1px solid var(--border);
      color: var(--muted);
      font-size: 20px;
      font-family: var(--font-mono);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.15s;
      -webkit-tap-highlight-color: transparent;
    }
    .discard-btn:hover { border-color: var(--accent); color: var(--accent); }
    .discard-btn:active { transform: scale(0.97); }
    .discard-btn[hidden] { display: none; }

    .mic-btn {
      width: 100%;
      height: 64px;
      border: none;
      border-radius: 4px;
      background: var(--surface);
      border: 1px solid var(--border);
      color: var(--text);
      font-family: var(--font-mono);
      font-size: 13px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      transition: all 0.15s;
      -webkit-tap-highlight-color: transparent;
      user-select: none;
    }
    .mic-btn:active { transform: scale(0.97); }
    .mic-btn.recording {
      background: var(--accent-dim);
      border-color: var(--accent);
      color: var(--accent);
    }
    .mic-btn.recording .mic-icon { animation: pulse 1.2s ease infinite; }

    .mic-icon {
      width: 20px;
      height: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    :focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

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

    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }
    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.4; }
    }
    @keyframes blink {
      0%, 100% { opacity: 1; }
      50% { opacity: 0; }
    }