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

    body {
      font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(145deg, #f6f9fc 0%, #e9f0f5 100%);
      padding: 1.5rem;
      color: #1e2b36;
    }

    /* main card – dark glassmorphism */
    .login-card {
      width: 100%;
      max-width: 400px;
      background: rgba(255, 255, 255, 0.75);
      backdrop-filter: blur(6px);
      -webkit-backdrop-filter: blur(6px);
      border-radius: 40px;
      padding: 2.5rem 2rem 2.8rem;
      box-shadow: 
        0 20px 40px -12px rgba(0, 20, 30, 0.12),
        0 8px 24px -6px rgba(0, 0, 0, 0.02),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
      border: 1px solid rgba(255, 255, 255, 0.5);
      transition: box-shadow 0.3s ease;
    }

    .login-card:hover {
      box-shadow: 0 28px 48px -16px rgba(0, 30, 40, 0.18);
    }

    /* brand / name */
    .brand {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin-bottom: 2.2rem;
    }

    .brand-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 48px;
      height: 48px;
      background: rgba(255,255,255,0.9);
      border-radius: 12px;
      padding: 4px;
    }

    .brand-icon img {
      height: 100%;
      width: 100%;
      object-fit: contain;
    }

    .brand-name {
      font-size: 2rem;
      font-weight: 500;
      letter-spacing: -0.02em;
      color: #1e2b36;
      background: linear-gradient(135deg, #1f2e3a, #2a3f4e);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* welcome text */
    .greeting {
      text-align: center;
      margin-bottom: 2.2rem;
    }

    .greeting h2 {
      font-size: 1.5rem;
      font-weight: 500;
      color: #1f2e3a;
      letter-spacing: -0.02em;
      margin-bottom: 6px;
    }

    .greeting p {
      font-size: 0.95rem;
      color: #62778b;
      font-weight: 400;
      letter-spacing: 0.01em;
    }

    /* form elements */
    .input-group {
      margin-bottom: 1.5rem;
      position: relative;
    }

    .input-group label {
      display: block;
      font-size: 0.8rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: #4d6679;
      margin-bottom: 0.4rem;
      margin-left: 0.25rem;
    }

    .input-field {
      width: 100%;
      padding: 0.9rem 1rem 0.9rem 2.8rem;
      font-size: 1rem;
      font-weight: 400;
      font-family: 'Inter', sans-serif;
      background: rgba(255, 255, 255, 0.6);
      border: 1px solid rgba(180, 195, 210, 0.4);
      border-radius: 30px;
      color: #1c2a35;
      transition: all 0.2s ease;
      outline: none;
    }

    .input-field:focus {
      border-color: #8daec9;
      background: rgba(255, 255, 255, 0.8);
      box-shadow: 0 4px 12px rgba(60, 100, 130, 0.06), inset 0 1px 4px rgba(0,0,0,0.02);
    }

    .input-field::placeholder {
      color: #a6bacb;
      font-weight: 300;
    }

    .input-icon {
      position: absolute;
      left: 1rem;
      top: 2.25rem;
      color: #8ba3b5;
      font-size: 1.1rem;
      transition: color 0.2s;
      pointer-events: none;
    }

    .input-group:focus-within .input-icon {
      color: #2b4b5e;
    }

    /* login button */
    .login-btn {
      width: 100%;
      padding: 0.9rem 1rem;
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 40px;
      background: linear-gradient(135deg, #1e2f3c, #2a4050);
      color: #f2f7fc;
      font-size: 1rem;
      font-weight: 500;
      font-family: 'Inter', sans-serif;
      letter-spacing: 0.02em;
      cursor: pointer;
      transition: all 0.25s ease;
      box-shadow: 0 4px 14px rgba(30, 50, 65, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      margin-top: 1rem;
    }

    .login-btn i {
      font-size: 0.9rem;
      opacity: 0.7;
      transition: transform 0.2s ease;
    }

    .login-btn:hover {
      background: linear-gradient(135deg, #243b4a, #2f4b5f);
      box-shadow: 0 8px 24px rgba(30, 60, 80, 0.2);
      transform: scale(1.01);
      color: #ffffff;
    }

    .login-btn:hover i {
      transform: translateX(4px);
      opacity: 1;
    }

    .login-btn:active {
      transform: scale(0.98);
    }

    .error-message {
      background: #fee2e2;
      color: #991b1b;
      padding: 12px;
      border-radius: 12px;
      font-size: 0.85rem;
      margin-bottom: 20px;
      border: 1px solid #fecaca;
      text-align: center;
    }

    @keyframes fadeUp {
      0% { opacity: 0; transform: translateY(10px); }
      100% { opacity: 1; transform: translateY(0); }
    }

    .login-card {
      animation: fadeUp 0.5s ease-out forwards;
    }

    .version {
      text-align: center;
      margin-top: 20px;
      font-size: 0.75rem;
      color: #a6bacb;
      font-weight: 400;
    }