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

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      background: #1a1d21;
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }

    /* Subtle grid background */
    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background-image:
        linear-gradient(rgba(255,205,0,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,205,0,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
    }

    .card {
      background: #22262c;
      border: 1px solid #2e333a;
      border-radius: 16px;
      padding: 48px 44px 40px;
      width: 100%;
      max-width: 400px;
      box-shadow: 0 24px 64px rgba(0,0,0,0.4);
      position: relative;
    }

    .logo-wrap {
      text-align: center;
      margin-bottom: 32px;
    }

    .logo-wrap img {
      height: 52px;
      width: auto;
    }

    .tagline {
      text-align: center;
      font-size: 13px;
      color: #6b7280;
      margin-top: 8px;
      letter-spacing: 0.04em;
      text-transform: uppercase;
    }

    .divider {
      height: 1px;
      background: #2e333a;
      margin: 28px 0;
    }

    .field {
      margin-bottom: 16px;
    }

    .field label {
      display: block;
      font-size: 12px;
      font-weight: 600;
      color: #9ca3af;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      margin-bottom: 7px;
    }

    .field input {
      width: 100%;
      background: #1a1d21;
      border: 1px solid #2e333a;
      border-radius: 8px;
      padding: 11px 14px;
      font-size: 15px;
      color: #f3f4f6;
      outline: none;
      transition: border-color 0.15s;
    }

    .field input:focus {
      border-color: #ffcd00;
    }

    .field input::placeholder {
      color: #4b5563;
    }

    .login-btn {
      width: 100%;
      background: #ffcd00;
      color: #111;
      border: none;
      border-radius: 8px;
      padding: 12px;
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      margin-top: 8px;
      transition: background 0.15s, transform 0.1s;
      letter-spacing: 0.01em;
    }

    .login-btn:hover  { background: #f0c000; }
    .login-btn:active { transform: scale(0.99); }
    .login-btn:disabled { opacity: 0.5; cursor: not-allowed; }

    .error-msg {
      min-height: 20px;
      font-size: 13px;
      color: #f87171;
      text-align: center;
      margin-top: 12px;
    }

    .footer {
      text-align: center;
      font-size: 11px;
      color: #374151;
      margin-top: 32px;
    }

    /* Loading spinner overlay */
    .spinner {
      display: none;
      position: absolute;
      inset: 0;
      background: rgba(34,38,44,0.7);
      border-radius: 16px;
      align-items: center;
      justify-content: center;
    }
    .spinner.active { display: flex; }
    .spinner-ring {
      width: 36px; height: 36px;
      border: 3px solid #2e333a;
      border-top-color: #ffcd00;
      border-radius: 50%;
      animation: spin 0.7s linear infinite;
    }
    @keyframes spin { to { transform: rotate(360deg); } }

  /* ===== ZZ2 light theme for login (ADDITIVE) — default shows light; existing design = dark mode ===== */
    :root{color-scheme:dark}
  :root:not([data-theme="dark"]){color-scheme:light}
  :root:not([data-theme="dark"]) body{background:#eef0f3}
  :root:not([data-theme="dark"]) .card{background:#fff;border-color:#e5e7eb;box-shadow:0 1px 3px rgba(16,24,40,.08),0 8px 24px rgba(16,24,40,.06)}
  :root:not([data-theme="dark"]) .divider{background:#e5e7eb}
  :root:not([data-theme="dark"]) .field label{color:#6b7280}
  :root:not([data-theme="dark"]) .field input{background:#fff;border-color:#e5e7eb;color:#22262c}
  :root:not([data-theme="dark"]) .field input::placeholder{color:#9ca3af}
  :root:not([data-theme="dark"]) .error-msg{color:#dc2626}
  :root:not([data-theme="dark"]) .footer{color:#9ca3af}
  :root:not([data-theme="dark"]) .spinner{background:rgba(255,255,255,0.72)}
  :root:not([data-theme="dark"]) .spinner-ring{border-color:#e5e7eb;border-top-color:#ffcd00}

  /* floating theme toggle */
  #themeToggle{position:fixed;top:14px;right:14px;z-index:1000;appearance:none;
    border:1px solid rgba(120,130,145,.4);background:rgba(40,44,52,.55);color:#e5e7eb;font:inherit;
    font-size:16px;line-height:1;width:38px;height:38px;border-radius:10px;cursor:pointer;
    display:inline-flex;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
  :root:not([data-theme="dark"]) #themeToggle{background:rgba(255,255,255,.8);border-color:#d1d5db;color:#22262c;
    box-shadow:0 1px 3px rgba(16,24,40,.1)}
  #themeToggle:hover{filter:brightness(1.08)}
  
/* zz2-mobile-base */
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
@media (max-width: 640px) {
  input, select, textarea { font-size: 16px !important; }   /* no focus-zoom on iOS */
  img, svg, video { max-width: 100%; }
}

/* zz2-mobile-login */
@media (max-width: 640px) {
  body { padding: 16px; }
  .card { padding: 32px 24px 28px; border-radius: 14px; }
}