/* ─── AUTH: Auth Screens, Loading Screen, Onboarding ───────────────────── */
  /* ONBOARDING */
  #onboarding {
    position: fixed; inset: 0; z-index: 100;
    background: var(--bg);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    padding: 24px;
    overflow-y: auto;
  }
  .ob-logo {
    font-family: var(--font-display);
    font-size: 28px; font-weight: 800;
    letter-spacing: -1px;
    color: var(--text);
    margin-bottom: 4px;
  }
  .ob-logo span { color: var(--accent); font-weight: 400; }
  .ob-tagline {
    font-size: 13px; color: var(--text3);
    letter-spacing: 2px; text-transform: uppercase;
    margin-bottom: 40px;
    font-family: var(--font-mono);
  }
  .ob-form {
    width: 100%; max-width: 420px;
    display: flex; flex-direction: column; gap: 16px;
  }
  .ob-section-label {
    font-family: var(--font-display);
    font-size: 11px; font-weight: 700;
    letter-spacing: 3px; text-transform: uppercase;
    color: var(--text3); margin-top: 8px;
  }
  .ob-field { display: flex; flex-direction: column; gap: 6px; }
  .ob-field label {
    font-size: 12px; color: var(--text2);
    font-family: var(--font-mono);
    letter-spacing: 0.5px; line-height: 1.4; word-break: break-word;
  }
  .ob-field input, .ob-field select {
    background: var(--surface2);
    border: 1px solid var(--border2);
    color: var(--text);
    font-family: var(--font-display);
    font-size: 20px; font-weight: 600;
    padding: 13px 16px;
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    width: 100%;
  }
  .ob-field input:focus, .ob-field select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(124,255,196,0.12);
  }
  .ob-field input::placeholder { color: var(--text3); font-weight: 400; font-size: 16px; }
  .ob-field .unit {
    font-size: 12px; color: var(--text3);
    font-family: var(--font-mono); margin-top: 2px;
  }
  .ob-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .ob-cta {
    margin-top: 8px;
    background: var(--accent);
    color: #000;
    font-family: var(--font-display);
    font-size: 16px; font-weight: 700;
    letter-spacing: 0.5px;
    padding: 16px;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
  }
  .ob-cta:active { transform: scale(0.98); opacity: 0.9; }
  .ob-error {
    background: var(--accent2-dim);
    border: 1px solid var(--accent2);
    color: var(--accent2);
    font-size: 13px; padding: 10px 14px;
    border-radius: var(--radius-sm);
    display: none;
  }

  /* AUTH SCREENS */
  #auth-screen {
    position: fixed; inset: 0; z-index: 200;
    background: var(--bg);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    padding: 24px; overflow-y: auto;
  }
  .auth-logo { font-family: var(--font-display); font-size: 32px; font-weight: 800; letter-spacing: -1px; margin-bottom: 4px; }
  .auth-logo span { color: var(--accent); }
  .auth-tagline { font-family: var(--font-mono); font-size: 11px; color: var(--text3); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 16px; }
  .auth-copy {
    font-family: var(--font-body); font-size: 14px; color: var(--text2);
    line-height: 1.65; text-align: center; max-width: 300px;
    margin-bottom: 24px;
  }
  .auth-copy strong, .auth-copy b { color: var(--text); font-weight: 600; }
  .auth-card { width: 100%; max-width: 380px; display: flex; flex-direction: column; gap: 14px; }
  .auth-tabs { display: grid; grid-template-columns: 1fr 1fr; background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius); padding: 4px; gap: 4px; margin-bottom: 4px; }
  .auth-tab { padding: 10px; background: transparent; border: none; color: var(--text3); font-family: var(--font-display); font-size: 14px; font-weight: 700; border-radius: calc(var(--radius) - 4px); cursor: pointer; transition: all 0.18s; }
  .auth-tab.active { background: var(--surface); color: var(--accent); box-shadow: 0 1px 4px rgba(0,0,0,0.3); }
  .auth-field { display: flex; flex-direction: column; gap: 6px; }
  .auth-field label { font-family: var(--font-mono); font-size: 11px; color: var(--text3); letter-spacing: 1px; text-transform: uppercase; }
  .auth-field input {
    background: var(--surface2); border: 1px solid var(--border2);
    color: var(--text); font-family: var(--font-display); font-size: 16px; font-weight: 600;
    padding: 14px 16px; border-radius: var(--radius-sm); outline: none; width: 100%;
    transition: border-color 0.2s;
  }
  .auth-field input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124,255,196,0.1); }
  .auth-cta {
    background: var(--accent); color: #000;
    font-family: var(--font-display); font-size: 16px; font-weight: 700;
    padding: 15px; border: none; border-radius: var(--radius); cursor: pointer;
    transition: opacity 0.2s, transform 0.1s; margin-top: 4px;
  }
  .auth-cta:active { transform: scale(0.98); opacity: 0.9; }
  .auth-cta:disabled { opacity: 0.4; cursor: not-allowed; }
  .auth-error { background: var(--accent2-dim); border: 1px solid var(--accent2); color: var(--accent2); font-size: 13px; padding: 10px 14px; border-radius: var(--radius-sm); display: none; font-family: var(--font-mono); }
  .auth-success { background: var(--accent-dim); border: 1px solid var(--accent); color: var(--accent); font-size: 13px; padding: 10px 14px; border-radius: var(--radius-sm); display: none; font-family: var(--font-mono); }
  .auth-link { text-align: center; font-family: var(--font-mono); font-size: 11px; color: var(--text3); cursor: pointer; text-decoration: underline; letter-spacing: 0.5px; }
  .auth-link:hover { color: var(--accent); }
  .auth-link-inline {
    color: var(--accent); cursor: pointer; text-decoration: underline;
    font-family: var(--font-mono); font-size: 11px;
  }
  .auth-checkbox-row {
    display: flex; align-items: flex-start; gap: 10px; cursor: pointer;
  }
  .auth-checkbox-row input[type="checkbox"] {
    width: 16px; height: 16px; margin-top: 1px; flex-shrink: 0;
    accent-color: var(--accent); cursor: pointer;
  }
  .auth-checkbox-label {
    font-family: var(--font-mono); font-size: 11px;
    color: var(--text3); line-height: 1.5; letter-spacing: 0.3px;
  }
  .auth-divider { text-align: center; font-family: var(--font-mono); font-size: 10px; color: var(--text3); letter-spacing: 1px; }

  /* PASSWORD SHOW/HIDE */
  .auth-pwd-wrap {
    position: relative; display: flex; align-items: center;
  }
  .auth-pwd-wrap input {
    width: 100%; padding-right: 44px;
  }
  .auth-pwd-toggle {
    position: absolute; right: 12px;
    background: none; border: none; cursor: pointer;
    font-size: 16px; color: var(--text3); padding: 4px;
    line-height: 1; transition: opacity 0.15s;
    user-select: none;
  }
  .auth-pwd-toggle:hover { opacity: 0.8; }

  /* LOADING SCREEN */
  #loading-screen {
    position: fixed; inset: 0; z-index: 300;
    background: var(--bg); display: flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 16px;
  }
  .loading-logo { font-family: var(--font-display); font-size: 28px; font-weight: 800; letter-spacing: -1px; }
  .loading-logo span { color: var(--accent); }
  .loading-spinner {
    width: 32px; height: 32px; border: 2px solid var(--border2);
    border-top-color: var(--accent); border-radius: 50%;
    animation: spin 0.8s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }
  .loading-text { font-family: var(--font-mono); font-size: 11px; color: var(--text3); letter-spacing: 2px; }